Implemented basic library and test application
This commit is contained in:
parent
e9e2cf2e63
commit
e639db5e5b
3
.gitmodules
vendored
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3
.gitmodules
vendored
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@ -0,0 +1,3 @@
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[submodule "ds3231/usart"]
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path = ds3231/usart
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url = git@blackmark.me:usart.git
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56
ds3231/bootloader.h
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56
ds3231/bootloader.h
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@ -0,0 +1,56 @@
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/*
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* Copyright (c) by BlackMark 2016
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* Date 09/09/2016
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* Version 1.4
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*/
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#ifndef BOOTLOADER_H
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#define BOOTLOADER_H
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#include <avr/pgmspace.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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typedef void (*flash)() __attribute__ ((noreturn));
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flash boot = reinterpret_cast<flash>( 0x0000 );
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flash bootloader = reinterpret_cast<flash>( 0x7E00 / 2 );
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inline bool checkBootloader()
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{
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if( pgm_read_byte( reinterpret_cast<uint16_t>( bootloader ) * 2 ) == 0xF8 )
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{
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return true;
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}
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return false;
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}
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inline void callBootloader()
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{
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if( checkBootloader() )
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{
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bootloader();
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}
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else
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{
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boot();
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}
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}
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inline uint8_t handleReset()
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{
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wdt_reset();
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uint8_t ui8MCUSR = MCUSR;
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MCUSR &= ~( 1 << WDRF );
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wdt_disable();
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return ui8MCUSR;
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}
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inline void reset()
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{
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wdt_enable( WDTO_15MS );
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while( true );
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}
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#endif
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14
ds3231/clock.h
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14
ds3231/clock.h
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@ -0,0 +1,14 @@
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/*
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* Copyright (c) by BlackMark 2015
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* Date 24/11/2015
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* Version 1.1
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*/
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#ifndef CLOCK_H
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#define CLOCK_H
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#define F_CPU 16000000
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#include <util/delay.h>
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#endif
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@ -36,7 +36,7 @@
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<dependencies>
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<dependencies>
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<content-extension eid="atmel.asf" uuidref="Atmel.ASF" version="3.34.2" />
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<content-extension eid="atmel.asf" uuidref="Atmel.ASF" version="3.34.2" />
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</dependencies>
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</dependencies>
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</framework-data>
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</framework-data>
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</AsfFrameworkConfig>
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</AsfFrameworkConfig>
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<avrtool>com.atmel.avrdbg.tool.simulator</avrtool>
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<avrtool>com.atmel.avrdbg.tool.simulator</avrtool>
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<avrtoolserialnumber />
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<avrtoolserialnumber />
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@ -78,25 +78,49 @@
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<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
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<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
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<avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcc.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcc.compiler.directories.IncludePaths>
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<avrgcc.compiler.directories.IncludePaths>
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<ListValues>
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<Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
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</ListValues>
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</avrgcc.compiler.directories.IncludePaths>
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<avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
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<avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
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<avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
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<avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
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<avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcccpp.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.compiler.directories.IncludePaths>
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<avrgcccpp.compiler.directories.IncludePaths>
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<ListValues>
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<Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
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</ListValues>
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</avrgcccpp.compiler.directories.IncludePaths>
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<avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
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<avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
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<avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
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<avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
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<avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
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<avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
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<avrgcccpp.compiler.miscellaneous.OtherFlags>-Wextra -std=c++11</avrgcccpp.compiler.miscellaneous.OtherFlags>
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<avrgcccpp.compiler.miscellaneous.OtherFlags>-Wextra -std=c++11</avrgcccpp.compiler.miscellaneous.OtherFlags>
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<avrgcccpp.linker.libraries.Libraries><ListValues><Value>libm</Value></ListValues></avrgcccpp.linker.libraries.Libraries>
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<avrgcccpp.linker.libraries.Libraries>
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<avrgcccpp.assembler.general.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.assembler.general.IncludePaths>
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<ListValues>
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<avrgcc.compiler.symbols.DefSymbols><ListValues><Value>NDEBUG</Value></ListValues></avrgcc.compiler.symbols.DefSymbols>
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<Value>libm</Value>
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</ListValues>
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</avrgcccpp.linker.libraries.Libraries>
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<avrgcccpp.assembler.general.IncludePaths>
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<ListValues>
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<Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
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</ListValues>
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</avrgcccpp.assembler.general.IncludePaths>
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<avrgcc.compiler.symbols.DefSymbols>
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<ListValues>
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<Value>NDEBUG</Value>
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</ListValues>
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</avrgcc.compiler.symbols.DefSymbols>
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<avrgcc.compiler.optimization.level>Optimize for size (-Os)</avrgcc.compiler.optimization.level>
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<avrgcc.compiler.optimization.level>Optimize for size (-Os)</avrgcc.compiler.optimization.level>
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<avrgcccpp.compiler.symbols.DefSymbols><ListValues><Value>NDEBUG</Value></ListValues></avrgcccpp.compiler.symbols.DefSymbols>
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<avrgcccpp.compiler.symbols.DefSymbols>
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<ListValues>
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<Value>NDEBUG</Value>
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</ListValues>
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</avrgcccpp.compiler.symbols.DefSymbols>
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<avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level>
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<avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level>
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</AvrGccCpp>
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</AvrGccCpp>
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</ToolchainSettings>
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</ToolchainSettings>
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<PreBuildEvent>echo "C:\avrdude-6.2\avrdude.exe" -v -p$(avrdevice) %%* -Uflash:w:"$(OutputDirectory)\$(Name).hex":i > "$(MSBuildProjectDirectory)\avrdude.bat"</PreBuildEvent>
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<PreBuildEvent>echo "C:\avrdude-6.2\avrdude.exe" -v -p$(avrdevice) %%* -Uflash:w:"$(OutputDirectory)\$(Name).hex":i > "$(MSBuildProjectDirectory)\avrdude.bat"</PreBuildEvent>
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</PropertyGroup>
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</PropertyGroup>
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@ -111,35 +135,92 @@
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<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
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<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
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<avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcc.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcc.compiler.directories.IncludePaths>
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<avrgcc.compiler.symbols.DefSymbols>
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<ListValues>
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<Value>DEBUG</Value>
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</ListValues>
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</avrgcc.compiler.symbols.DefSymbols>
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<avrgcc.compiler.directories.IncludePaths>
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<ListValues>
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<Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
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</ListValues>
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</avrgcc.compiler.directories.IncludePaths>
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<avrgcc.compiler.optimization.level>Optimize (-O1)</avrgcc.compiler.optimization.level>
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<avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
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<avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
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<avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcc.compiler.optimization.DebugLevel>Default (-g2)</avrgcc.compiler.optimization.DebugLevel>
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<avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
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<avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
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<avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
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<avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
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<avrgcccpp.compiler.directories.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.compiler.directories.IncludePaths>
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<avrgcccpp.compiler.symbols.DefSymbols>
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<ListValues>
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<Value>DEBUG</Value>
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</ListValues>
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</avrgcccpp.compiler.symbols.DefSymbols>
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<avrgcccpp.compiler.directories.IncludePaths>
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<ListValues>
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<Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
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</ListValues>
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</avrgcccpp.compiler.directories.IncludePaths>
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<avrgcccpp.compiler.optimization.level>Optimize (-O1)</avrgcccpp.compiler.optimization.level>
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<avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
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<avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
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||||||
<avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
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<avrgcccpp.compiler.optimization.DebugLevel>Default (-g2)</avrgcccpp.compiler.optimization.DebugLevel>
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<avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
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<avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
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<avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
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<avrgcccpp.compiler.warnings.Pedantic>True</avrgcccpp.compiler.warnings.Pedantic>
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<avrgcccpp.compiler.miscellaneous.OtherFlags>-Wextra -std=c++11</avrgcccpp.compiler.miscellaneous.OtherFlags>
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<avrgcccpp.compiler.miscellaneous.OtherFlags>-Wextra -std=c++14</avrgcccpp.compiler.miscellaneous.OtherFlags>
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<avrgcccpp.linker.libraries.Libraries><ListValues><Value>libm</Value></ListValues></avrgcccpp.linker.libraries.Libraries>
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<avrgcccpp.linker.libraries.Libraries>
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<avrgcccpp.assembler.general.IncludePaths><ListValues><Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value></ListValues></avrgcccpp.assembler.general.IncludePaths>
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<ListValues>
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<avrgcc.compiler.symbols.DefSymbols><ListValues><Value>DEBUG</Value></ListValues></avrgcc.compiler.symbols.DefSymbols>
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<Value>libm</Value>
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<avrgcc.compiler.optimization.level>Optimize (-O1)</avrgcc.compiler.optimization.level>
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</ListValues>
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<avrgcc.compiler.optimization.DebugLevel>Default (-g2)</avrgcc.compiler.optimization.DebugLevel>
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</avrgcccpp.linker.libraries.Libraries>
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||||||
<avrgcccpp.compiler.symbols.DefSymbols><ListValues><Value>DEBUG</Value></ListValues></avrgcccpp.compiler.symbols.DefSymbols>
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<avrgcccpp.assembler.general.IncludePaths>
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||||||
<avrgcccpp.compiler.optimization.level>Optimize (-O1)</avrgcccpp.compiler.optimization.level>
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<ListValues>
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||||||
<avrgcccpp.compiler.optimization.DebugLevel>Default (-g2)</avrgcccpp.compiler.optimization.DebugLevel>
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<Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
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||||||
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</ListValues>
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||||||
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</avrgcccpp.assembler.general.IncludePaths>
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||||||
<avrgcccpp.assembler.debugging.DebugLevel>Default (-Wa,-g)</avrgcccpp.assembler.debugging.DebugLevel>
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<avrgcccpp.assembler.debugging.DebugLevel>Default (-Wa,-g)</avrgcccpp.assembler.debugging.DebugLevel>
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</AvrGccCpp>
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</AvrGccCpp>
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</ToolchainSettings>
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</ToolchainSettings>
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<PreBuildEvent>echo "C:\avrdude-6.2\avrdude.exe" -v -p$(avrdevice) %%* -Uflash:w:"$(OutputDirectory)\$(Name).hex":i > "$(MSBuildProjectDirectory)\avrdude.bat"</PreBuildEvent>
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<PreBuildEvent>echo "C:\avrdude-6.2\avrdude.exe" -v -p$(avrdevice) %%* -Uflash:w:"$(OutputDirectory)\$(Name).hex":i > "$(MSBuildProjectDirectory)\avrdude.bat"</PreBuildEvent>
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</PropertyGroup>
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</PropertyGroup>
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<ItemGroup>
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<ItemGroup>
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<Compile Include="bootloader.h">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="clock.h">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="main.cpp">
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<Compile Include="main.cpp">
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<SubType>compile</SubType>
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<SubType>compile</SubType>
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||||||
</Compile>
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</Compile>
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<Compile Include="rtc.cpp">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="rtc.h">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="twi-lowlevel.cpp">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="twi-lowlevel.h">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="twi.cpp">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="twi.h">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="usart\usart.cpp">
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<SubType>compile</SubType>
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</Compile>
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<Compile Include="usart\usart.h">
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<SubType>compile</SubType>
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</Compile>
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</ItemGroup>
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<ItemGroup>
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<Folder Include="usart" />
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</ItemGroup>
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</ItemGroup>
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||||||
<Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
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<Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
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</Project>
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</Project>
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100
ds3231/main.cpp
100
ds3231/main.cpp
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/*
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* Copyright (c) by BlackMark 2017
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||||||
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* Date 26/04/2017
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||||||
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* Version 1.0
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||||||
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*/
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#include <stdio.h>
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#include "usart/usart.h"
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||||||
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#include "clock.h"
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||||||
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#include "bootloader.h"
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#include "twi.h"
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#include "rtc.h"
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||||||
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void setup()
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{
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||||||
|
USART0 &cSerial = USART0::inst();
|
||||||
|
|
||||||
|
twi_init_master();
|
||||||
|
rtc_init();
|
||||||
|
rtc_set_time_s( 12, 0, 50 );
|
||||||
|
|
||||||
|
if( rtc_is_ds3231() )
|
||||||
|
{
|
||||||
|
cSerial << "DS3231 detected!" << "\r\n";
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
cSerial << "ERROR - No RTC detected!" << "\r\n";
|
||||||
|
}
|
||||||
|
|
||||||
|
rtc_set_alarm_s( 12, 1, 0 );
|
||||||
|
}
|
||||||
|
|
||||||
|
int main()
|
||||||
|
{
|
||||||
|
uint8_t ui8MCUSR = handleReset();
|
||||||
|
|
||||||
|
if( ui8MCUSR & ( 1 << WDRF ) )
|
||||||
|
{
|
||||||
|
callBootloader();
|
||||||
|
}
|
||||||
|
|
||||||
|
USART0 &cSerial = USART0::inst();
|
||||||
|
|
||||||
|
cSerial.init( 9600 );
|
||||||
|
sei();
|
||||||
|
|
||||||
|
setup();
|
||||||
|
|
||||||
|
uint8_t ui8Hour;
|
||||||
|
uint8_t ui8Minute;
|
||||||
|
uint8_t ui8Second;
|
||||||
|
|
||||||
|
rtc_get_alarm_s( &ui8Hour, &ui8Minute, &ui8Second );
|
||||||
|
|
||||||
|
char szBuffer[32];
|
||||||
|
sprintf( szBuffer, "Alarm set to: %02d:%02d:%02d\r\n", ui8Hour, ui8Minute, ui8Second );
|
||||||
|
cSerial << szBuffer << "\r\n";
|
||||||
|
|
||||||
|
while( true )
|
||||||
|
{
|
||||||
|
tm* tmTime = rtc_get_time();
|
||||||
|
|
||||||
|
if( tmTime->sec != ui8Second )
|
||||||
|
{
|
||||||
|
ui8Hour = tmTime->hour;
|
||||||
|
ui8Minute = tmTime->min;
|
||||||
|
ui8Second = tmTime->sec;
|
||||||
|
|
||||||
|
sprintf( szBuffer, "%02d:%02d:%02d\r\n", ui8Hour, ui8Minute, ui8Second );
|
||||||
|
cSerial << "Time: " << szBuffer;
|
||||||
|
|
||||||
|
if( rtc_check_alarm() )
|
||||||
|
{
|
||||||
|
cSerial << "ALARM!" << "\r\n";
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t ui8Bootloader;
|
||||||
|
|
||||||
|
if( cSerial.receiveByte( ui8Bootloader ) )
|
||||||
|
{
|
||||||
|
if( ui8Bootloader == 'b' )
|
||||||
|
{
|
||||||
|
cSerial << "Bootloader . . . " << "\r\n";
|
||||||
|
_delay_ms( 1000 );
|
||||||
|
reset();
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
cSerial << "Invalid char: '";
|
||||||
|
cSerial.transmitByte( ui8Bootloader );
|
||||||
|
cSerial << "'" << "\r\n";
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
608
ds3231/rtc.cpp
Normal file
608
ds3231/rtc.cpp
Normal file
@ -0,0 +1,608 @@
|
|||||||
|
/*
|
||||||
|
* DS RTC Library: DS1307 and DS3231 driver library
|
||||||
|
* (C) 2011 Akafugu Corporation
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify it under the
|
||||||
|
* terms of the GNU General Public License as published by the Free Software
|
||||||
|
* Foundation; either version 2 of the License, or (at your option) any later
|
||||||
|
* version.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
|
||||||
|
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
|
||||||
|
* PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
/*
|
||||||
|
* DS1307 register map
|
||||||
|
*
|
||||||
|
* 00h-06h: seconds, minutes, hours, day-of-week, date, month, year (all in BCD)
|
||||||
|
* bit 7 of seconds enables/disables clock
|
||||||
|
* bit 6 of hours toggles 12/24h mode (1 for 12h, 0 for 24h)
|
||||||
|
* when 12h mode is selected bit 5 is high for PM, low for AM
|
||||||
|
* 07h: control
|
||||||
|
* bit7: OUT
|
||||||
|
* bit6: 0
|
||||||
|
* bit5: 0
|
||||||
|
* bit4: SQWE
|
||||||
|
* bit3: 0
|
||||||
|
* bit2: 0
|
||||||
|
* bit1: RS0
|
||||||
|
* bit0: RS1
|
||||||
|
* 08h-3fh: 56 bytes of SRAM
|
||||||
|
*
|
||||||
|
* DS3231 register map
|
||||||
|
*
|
||||||
|
* 00h-06h: seconds, minutes, hours, day-of-week, date, month, year (all in BCD)
|
||||||
|
* bit 7 should be set to zero: The DS3231 clock is always running
|
||||||
|
* 07h: A1M1 Alarm 1 seconds
|
||||||
|
* 08h: A1M2 Alarm 1 minutes
|
||||||
|
* 09h: A1M3 Alarm 1 hour (bit6 is am/pm flag in 12h mode)
|
||||||
|
* 0ah: A1M4 Alarm 1 day/date (bit6: 1 for day, 0 for date)
|
||||||
|
* 0bh: A2M2 Alarm 2 minutes
|
||||||
|
* 0ch: A2M3 Alarm 2 hour (bit6 is am/pm flag in 12h mode)
|
||||||
|
* 0dh: A2M4 Alarm 2 day/data (bit6: 1 for day, 0 for date)
|
||||||
|
* <see data sheet page12 for Alarm register mask bit tables:
|
||||||
|
* for alarm when hours, minutes and seconds match set 1000 for alarm 1>
|
||||||
|
* 0eh: control
|
||||||
|
* bit7: !EOSC
|
||||||
|
* bit6: BBSQW
|
||||||
|
* bit5: CONV
|
||||||
|
* bit4: RS2
|
||||||
|
* bit3: RS1
|
||||||
|
* bit2: INTCN
|
||||||
|
* bit1: A2IE
|
||||||
|
* bit0: A1IE
|
||||||
|
* 0fh: control/status
|
||||||
|
* bit7: OSF
|
||||||
|
* bit6: 0
|
||||||
|
* bit5: 0
|
||||||
|
* bit4: 0
|
||||||
|
* bit3: EN32kHz
|
||||||
|
* bit2: BSY
|
||||||
|
* bit1: A2F alarm 2 flag
|
||||||
|
* bit0: A1F alarm 1 flag
|
||||||
|
* 10h: aging offset (signed)
|
||||||
|
* 11h: MSB of temp (signed)
|
||||||
|
* 12h: LSB of temp in bits 7 and 6 (0.25 degrees for each 00, 01, 10, 11)
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <avr/io.h>
|
||||||
|
|
||||||
|
#define TRUE 1
|
||||||
|
#define FALSE 0
|
||||||
|
|
||||||
|
#include "rtc.h"
|
||||||
|
|
||||||
|
#define RTC_ADDR 0x68 // I2C address
|
||||||
|
#define CH_BIT 7 // clock halt bit
|
||||||
|
|
||||||
|
// statically allocated structure for time value
|
||||||
|
struct tm _tm;
|
||||||
|
|
||||||
|
uint8_t dec2bcd(uint8_t d)
|
||||||
|
{
|
||||||
|
return ((d/10 * 16) + (d % 10));
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t bcd2dec(uint8_t b)
|
||||||
|
{
|
||||||
|
return ((b/16 * 10) + (b % 16));
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t rtc_read_byte(uint8_t offset)
|
||||||
|
{
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(offset);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
return twi_receive();
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_write_byte(uint8_t b, uint8_t offset)
|
||||||
|
{
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(offset);
|
||||||
|
twi_send_byte(b);
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
|
||||||
|
static bool s_is_ds1307 = false;
|
||||||
|
static bool s_is_ds3231 = false;
|
||||||
|
|
||||||
|
void rtc_init(void)
|
||||||
|
{
|
||||||
|
// Attempt autodetection:
|
||||||
|
// 1) Read and save temperature register
|
||||||
|
// 2) Write a value to temperature register
|
||||||
|
// 3) Read back the value
|
||||||
|
// equal to the one written: DS1307, write back saved value and return
|
||||||
|
// different from written: DS3231
|
||||||
|
|
||||||
|
uint8_t temp1 = rtc_read_byte(0x11);
|
||||||
|
uint8_t temp2 = rtc_read_byte(0x12);
|
||||||
|
|
||||||
|
rtc_write_byte(0xee, 0x11);
|
||||||
|
rtc_write_byte(0xdd, 0x12);
|
||||||
|
|
||||||
|
if (rtc_read_byte(0x11) == 0xee && rtc_read_byte(0x12) == 0xdd) {
|
||||||
|
s_is_ds1307 = true;
|
||||||
|
// restore values
|
||||||
|
rtc_write_byte(temp1, 0x11);
|
||||||
|
rtc_write_byte(temp2, 0x12);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
s_is_ds3231 = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Autodetection
|
||||||
|
bool rtc_is_ds1307(void) { return s_is_ds1307; }
|
||||||
|
bool rtc_is_ds3231(void) { return s_is_ds3231; }
|
||||||
|
|
||||||
|
// Autodetection override
|
||||||
|
void rtc_set_ds1307(void) { s_is_ds1307 = true; s_is_ds3231 = false; }
|
||||||
|
void rtc_set_ds3231(void) { s_is_ds1307 = false; s_is_ds3231 = true; }
|
||||||
|
|
||||||
|
struct tm* rtc_get_time(void)
|
||||||
|
{
|
||||||
|
uint8_t rtc[9];
|
||||||
|
uint8_t century = 0;
|
||||||
|
|
||||||
|
// read 7 bytes starting from register 0
|
||||||
|
// sec, min, hour, day-of-week, date, month, year
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
twi_request_from(RTC_ADDR, 7);
|
||||||
|
|
||||||
|
for (uint8_t i = 0; i < 7; i++) {
|
||||||
|
rtc[i] = twi_receive();
|
||||||
|
}
|
||||||
|
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
// Clear clock halt bit from read data
|
||||||
|
// This starts the clock for a DS1307, and has no effect for a DS3231
|
||||||
|
rtc[0] &= ~(_BV(CH_BIT)); // clear bit
|
||||||
|
|
||||||
|
_tm.sec = bcd2dec(rtc[0]);
|
||||||
|
_tm.min = bcd2dec(rtc[1]);
|
||||||
|
_tm.hour = bcd2dec(rtc[2]);
|
||||||
|
_tm.mday = bcd2dec(rtc[4]);
|
||||||
|
_tm.mon = bcd2dec(rtc[5] & 0x1F); // returns 1-12
|
||||||
|
century = (rtc[5] & 0x80) >> 7;
|
||||||
|
_tm.year = century == 1 ? 2000 + bcd2dec(rtc[6]) : 1900 + bcd2dec(rtc[6]); // year 0-99
|
||||||
|
_tm.wday = bcd2dec(rtc[3]); // returns 1-7
|
||||||
|
|
||||||
|
if (_tm.hour == 0) {
|
||||||
|
_tm.twelveHour = 0;
|
||||||
|
_tm.am = 1;
|
||||||
|
} else if (_tm.hour < 12) {
|
||||||
|
_tm.twelveHour = _tm.hour;
|
||||||
|
_tm.am = 1;
|
||||||
|
} else {
|
||||||
|
_tm.twelveHour = _tm.hour - 12;
|
||||||
|
_tm.am = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
return &_tm;
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_get_time_s(uint8_t* hour, uint8_t* min, uint8_t* sec)
|
||||||
|
{
|
||||||
|
uint8_t rtc[9];
|
||||||
|
|
||||||
|
// read 7 bytes starting from register 0
|
||||||
|
// sec, min, hour, day-of-week, date, month, year
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
twi_request_from(RTC_ADDR, 7);
|
||||||
|
|
||||||
|
for(uint8_t i=0; i<7; i++) {
|
||||||
|
rtc[i] = twi_receive();
|
||||||
|
}
|
||||||
|
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
if (sec) *sec = bcd2dec(rtc[0]);
|
||||||
|
if (min) *min = bcd2dec(rtc[1]);
|
||||||
|
if (hour) *hour = bcd2dec(rtc[2]);
|
||||||
|
}
|
||||||
|
|
||||||
|
// fixme: support 12-hour mode for setting time
|
||||||
|
void rtc_set_time(struct tm* tm_)
|
||||||
|
{
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0);
|
||||||
|
|
||||||
|
uint8_t century;
|
||||||
|
if (tm_->year > 2000) {
|
||||||
|
century = 0x80;
|
||||||
|
tm_->year = tm_->year - 2000;
|
||||||
|
} else {
|
||||||
|
century = 0;
|
||||||
|
tm_->year = tm_->year - 1900;
|
||||||
|
}
|
||||||
|
|
||||||
|
// clock halt bit is 7th bit of seconds: this is always cleared to start the clock
|
||||||
|
twi_send_byte(dec2bcd(tm_->sec)); // seconds
|
||||||
|
twi_send_byte(dec2bcd(tm_->min)); // minutes
|
||||||
|
twi_send_byte(dec2bcd(tm_->hour)); // hours
|
||||||
|
twi_send_byte(dec2bcd(tm_->wday)); // day of week
|
||||||
|
twi_send_byte(dec2bcd(tm_->mday)); // day
|
||||||
|
twi_send_byte(dec2bcd(tm_->mon) + century); // month
|
||||||
|
twi_send_byte(dec2bcd(tm_->year)); // year
|
||||||
|
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_set_time_s(uint8_t hour, uint8_t min, uint8_t sec)
|
||||||
|
{
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0);
|
||||||
|
|
||||||
|
// clock halt bit is 7th bit of seconds: this is always cleared to start the clock
|
||||||
|
twi_send_byte(dec2bcd(sec)); // seconds
|
||||||
|
twi_send_byte(dec2bcd(min)); // minutes
|
||||||
|
twi_send_byte(dec2bcd(hour)); // hours
|
||||||
|
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
|
||||||
|
// DS1307 only (has no effect when run on DS3231)
|
||||||
|
// halt/start the clock
|
||||||
|
// 7th bit of register 0 (second register)
|
||||||
|
// 0 = clock is running
|
||||||
|
// 1 = clock is not running
|
||||||
|
void rtc_run_clock(bool run)
|
||||||
|
{
|
||||||
|
if (s_is_ds3231) return;
|
||||||
|
|
||||||
|
uint8_t b = rtc_read_byte(0x0);
|
||||||
|
|
||||||
|
if (run)
|
||||||
|
b &= ~(_BV(CH_BIT)); // clear bit
|
||||||
|
else
|
||||||
|
b |= _BV(CH_BIT); // set bit
|
||||||
|
|
||||||
|
rtc_write_byte(b, 0x0);
|
||||||
|
}
|
||||||
|
|
||||||
|
// DS1307 only
|
||||||
|
// Returns true if the clock is running, false otherwise
|
||||||
|
// For DS3231, it always returns true
|
||||||
|
bool rtc_is_clock_running(void)
|
||||||
|
{
|
||||||
|
if (s_is_ds3231) return true;
|
||||||
|
|
||||||
|
uint8_t b = rtc_read_byte(0x0);
|
||||||
|
|
||||||
|
if (b & _BV(CH_BIT)) return false;
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
|
void ds3231_get_temp_int(int8_t* i, uint8_t* f)
|
||||||
|
{
|
||||||
|
uint8_t msb, lsb;
|
||||||
|
|
||||||
|
*i = 0;
|
||||||
|
*f = 0;
|
||||||
|
|
||||||
|
if (s_is_ds1307) return; // only valid on DS3231
|
||||||
|
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
// temp registers 0x11 and 0x12
|
||||||
|
twi_send_byte(0x11);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
twi_request_from(RTC_ADDR, 2);
|
||||||
|
|
||||||
|
if (twi_available()) {
|
||||||
|
msb = twi_receive(); // integer part (in twos complement)
|
||||||
|
lsb = twi_receive(); // fraction part
|
||||||
|
|
||||||
|
// integer part in entire byte
|
||||||
|
*i = msb;
|
||||||
|
// fractional part in top two bits (increments of 0.25)
|
||||||
|
*f = (lsb >> 6) * 25;
|
||||||
|
|
||||||
|
// float value can be read like so:
|
||||||
|
// float temp = ((((short)msb << 8) | (short)lsb) >> 6) / 4.0f;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_force_temp_conversion(uint8_t block)
|
||||||
|
{
|
||||||
|
if (s_is_ds1307) return; // only valid on DS3231
|
||||||
|
|
||||||
|
// read control register (0x0E)
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
uint8_t ctrl = twi_receive();
|
||||||
|
|
||||||
|
ctrl |= 0b00100000; // Set CONV bit
|
||||||
|
|
||||||
|
// write new control register value
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_send_byte(ctrl);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
if (!block) return;
|
||||||
|
|
||||||
|
// Temp conversion is ready when control register becomes 0
|
||||||
|
do {
|
||||||
|
// Block until CONV is 0
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_end_transmission();
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
} while ((twi_receive() & 0b00100000) != 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
#define DS1307_SRAM_ADDR 0x08
|
||||||
|
|
||||||
|
// SRAM: 56 bytes from address 0x08 to 0x3f (DS1307-only)
|
||||||
|
void rtc_get_sram(uint8_t* data)
|
||||||
|
{
|
||||||
|
// cannot receive 56 bytes in one go, because of the TWI library buffer limit
|
||||||
|
// so just receive one at a time for simplicity
|
||||||
|
for(int i=0;i<56;i++)
|
||||||
|
data[i] = rtc_get_sram_byte(i);
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_set_sram(uint8_t *data)
|
||||||
|
{
|
||||||
|
// cannot send 56 bytes in one go, because of the TWI library buffer limit
|
||||||
|
// so just send one at a time for simplicity
|
||||||
|
for(int i=0;i<56;i++)
|
||||||
|
rtc_set_sram_byte(data[i], i);
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t rtc_get_sram_byte(uint8_t offset)
|
||||||
|
{
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(DS1307_SRAM_ADDR + offset);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
return twi_receive();
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_set_sram_byte(uint8_t b, uint8_t offset)
|
||||||
|
{
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(DS1307_SRAM_ADDR + offset);
|
||||||
|
twi_send_byte(b);
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_SQW_enable(bool enable)
|
||||||
|
{
|
||||||
|
if (s_is_ds1307) {
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x07);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
// read control
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
uint8_t control = twi_receive();
|
||||||
|
|
||||||
|
if (enable)
|
||||||
|
control |= 0b00010000; // set SQWE to 1
|
||||||
|
else
|
||||||
|
control &= ~0b00010000; // set SQWE to 0
|
||||||
|
|
||||||
|
// write control back
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x07);
|
||||||
|
twi_send_byte(control);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
}
|
||||||
|
else { // DS3231
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
// read control
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
uint8_t control = twi_receive();
|
||||||
|
|
||||||
|
if (enable) {
|
||||||
|
control |= 0b01000000; // set BBSQW to 1
|
||||||
|
control &= ~0b00000100; // set INTCN to 0
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
control &= ~0b01000000; // set BBSQW to 0
|
||||||
|
}
|
||||||
|
|
||||||
|
// write control back
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_send_byte(control);
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_SQW_set_freq(enum RTC_SQW_FREQ freq)
|
||||||
|
{
|
||||||
|
if (s_is_ds1307) {
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x07);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
// read control (uses bits 0 and 1)
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
uint8_t control = twi_receive();
|
||||||
|
|
||||||
|
control &= ~0b00000011; // Set to 0
|
||||||
|
control |= freq; // Set freq bitmask
|
||||||
|
|
||||||
|
// write control back
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x07);
|
||||||
|
twi_send_byte(control);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
}
|
||||||
|
else { // DS3231
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
// read control (uses bits 3 and 4)
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
uint8_t control = twi_receive();
|
||||||
|
|
||||||
|
control &= ~0b00011000; // Set to 0
|
||||||
|
control |= (freq << 4); // Set freq bitmask
|
||||||
|
|
||||||
|
// write control back
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0E);
|
||||||
|
twi_send_byte(control);
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_osc32kHz_enable(bool enable)
|
||||||
|
{
|
||||||
|
if (!s_is_ds3231) return;
|
||||||
|
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0F);
|
||||||
|
twi_end_transmission();
|
||||||
|
|
||||||
|
// read status
|
||||||
|
twi_request_from(RTC_ADDR, 1);
|
||||||
|
uint8_t status = twi_receive();
|
||||||
|
|
||||||
|
if (enable)
|
||||||
|
status |= 0b00001000; // set to 1
|
||||||
|
else
|
||||||
|
status &= ~0b00001000; // Set to 0
|
||||||
|
|
||||||
|
// write status back
|
||||||
|
twi_begin_transmission(RTC_ADDR);
|
||||||
|
twi_send_byte(0x0F);
|
||||||
|
twi_send_byte(status);
|
||||||
|
twi_end_transmission();
|
||||||
|
}
|
||||||
|
|
||||||
|
// Alarm functionality
|
||||||
|
// fixme: should decide if "alarm disabled" mode should be available, or if alarm should always be enabled
|
||||||
|
// at 00:00:00. Currently, "alarm disabled" only works for ds3231
|
||||||
|
void rtc_reset_alarm(void)
|
||||||
|
{
|
||||||
|
if (s_is_ds1307) {
|
||||||
|
rtc_set_sram_byte(0, 0); // hour
|
||||||
|
rtc_set_sram_byte(0, 1); // minute
|
||||||
|
rtc_set_sram_byte(0, 2); // second
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
// writing 0 to bit 7 of all four alarm 1 registers disables alarm
|
||||||
|
rtc_write_byte(0, 0x07); // second
|
||||||
|
rtc_write_byte(0, 0x08); // minute
|
||||||
|
rtc_write_byte(0, 0x09); // hour
|
||||||
|
rtc_write_byte(0, 0x0a); // day
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// fixme: add an option to set whether or not the INTCN and Interrupt Enable flag is set when setting the alarm
|
||||||
|
void rtc_set_alarm_s(uint8_t hour, uint8_t min, uint8_t sec)
|
||||||
|
{
|
||||||
|
if (hour > 23) return;
|
||||||
|
if (min > 59) return;
|
||||||
|
if (sec > 59) return;
|
||||||
|
|
||||||
|
if (s_is_ds1307) {
|
||||||
|
rtc_set_sram_byte(hour, 0); // hour
|
||||||
|
rtc_set_sram_byte(min, 1); // minute
|
||||||
|
rtc_set_sram_byte(sec, 2); // second
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
/*
|
||||||
|
* 07h: A1M1:0 Alarm 1 seconds
|
||||||
|
* 08h: A1M2:0 Alarm 1 minutes
|
||||||
|
* 09h: A1M3:0 Alarm 1 hour (bit6 is am/pm flag in 12h mode)
|
||||||
|
* 0ah: A1M4:1 Alarm 1 day/date (bit6: 1 for day, 0 for date)
|
||||||
|
* Sets alarm to fire when hour, minute and second matches
|
||||||
|
*/
|
||||||
|
rtc_write_byte(dec2bcd(sec), 0x07); // second
|
||||||
|
rtc_write_byte(dec2bcd(min), 0x08); // minute
|
||||||
|
rtc_write_byte(dec2bcd(hour), 0x09); // hour
|
||||||
|
rtc_write_byte(0b10000001, 0x0a); // day (upper bit must be set)
|
||||||
|
|
||||||
|
// clear alarm flag
|
||||||
|
uint8_t val = rtc_read_byte(0x0f);
|
||||||
|
rtc_write_byte(val & ~0b00000001, 0x0f);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_set_alarm(struct tm* tm_)
|
||||||
|
{
|
||||||
|
if (!tm_) return;
|
||||||
|
rtc_set_alarm_s(tm_->hour, tm_->min, tm_->sec);
|
||||||
|
}
|
||||||
|
|
||||||
|
void rtc_get_alarm_s(uint8_t* hour, uint8_t* min, uint8_t* sec)
|
||||||
|
{
|
||||||
|
if (s_is_ds1307) {
|
||||||
|
if (hour) *hour = rtc_get_sram_byte(0);
|
||||||
|
if (min) *min = rtc_get_sram_byte(1);
|
||||||
|
if (sec) *sec = rtc_get_sram_byte(2);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
*sec = bcd2dec(rtc_read_byte(0x07) & ~0b10000000);
|
||||||
|
*min = bcd2dec(rtc_read_byte(0x08) & ~0b10000000);
|
||||||
|
*hour = bcd2dec(rtc_read_byte(0x09) & ~0b10000000);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
struct tm* rtc_get_alarm(void)
|
||||||
|
{
|
||||||
|
uint8_t hour, min, sec;
|
||||||
|
|
||||||
|
rtc_get_alarm_s(&hour, &min, &sec);
|
||||||
|
_tm.hour = hour;
|
||||||
|
_tm.min = min;
|
||||||
|
_tm.sec = sec;
|
||||||
|
return &_tm;
|
||||||
|
}
|
||||||
|
|
||||||
|
bool rtc_check_alarm(void)
|
||||||
|
{
|
||||||
|
if (s_is_ds1307) {
|
||||||
|
uint8_t hour = rtc_get_sram_byte(0);
|
||||||
|
uint8_t min = rtc_get_sram_byte(1);
|
||||||
|
uint8_t sec = rtc_get_sram_byte(2);
|
||||||
|
|
||||||
|
uint8_t cur_hour, cur_min, cur_sec;
|
||||||
|
rtc_get_time_s(&cur_hour, &cur_min, &cur_sec);
|
||||||
|
|
||||||
|
if (cur_hour == hour && cur_min == min && cur_sec == sec)
|
||||||
|
return true;
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
// Alarm 1 flag (A1F) in bit 0
|
||||||
|
uint8_t val = rtc_read_byte(0x0f);
|
||||||
|
|
||||||
|
// clear flag when set
|
||||||
|
if (val & 1)
|
||||||
|
rtc_write_byte(val & ~0b00000001, 0x0f);
|
||||||
|
|
||||||
|
return val & 1 ? 1 : 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
107
ds3231/rtc.h
Normal file
107
ds3231/rtc.h
Normal file
@ -0,0 +1,107 @@
|
|||||||
|
/*
|
||||||
|
* DS RTC Library: DS1307 and DS3231 driver library
|
||||||
|
* (C) 2011 Akafugu Corporation
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify it under the
|
||||||
|
* terms of the GNU General Public License as published by the Free Software
|
||||||
|
* Foundation; either version 2 of the License, or (at your option) any later
|
||||||
|
* version.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
|
||||||
|
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
|
||||||
|
* PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef DS1307_H
|
||||||
|
#define DS1307_H
|
||||||
|
|
||||||
|
#include <stdbool.h>
|
||||||
|
#include <avr/io.h>
|
||||||
|
#include "twi.h"
|
||||||
|
|
||||||
|
#define DS1307_SLAVE_ADDR 0b11010000
|
||||||
|
|
||||||
|
/** Time structure
|
||||||
|
*
|
||||||
|
* Both 24-hour and 12-hour time is stored, and is always updated when rtc_get_time is called.
|
||||||
|
*
|
||||||
|
* When setting time and alarm, 24-hour mode is always used.
|
||||||
|
*
|
||||||
|
* If you run your clock in 12-hour mode:
|
||||||
|
* - set time hour to store in twelveHour and set am to true or false.
|
||||||
|
* - call rtc_12h_translate (this will put the correct value in hour, so you don't have to
|
||||||
|
* calculate it yourself.
|
||||||
|
* - call rtc_set_alarm or rtc_set_clock
|
||||||
|
*
|
||||||
|
* Note that rtc_set_clock_s, rtc_set_alarm_s, rtc_get_time_s, rtc_set_alarm_s always operate in 24-hour mode
|
||||||
|
* and translation has to be done manually (you can call rtc_24h_to_12h to perform the calculation)
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
struct tm {
|
||||||
|
int sec; // 0 to 59
|
||||||
|
int min; // 0 to 59
|
||||||
|
int hour; // 0 to 23
|
||||||
|
int mday; // 1 to 31
|
||||||
|
int mon; // 1 to 12
|
||||||
|
int year; // year-99
|
||||||
|
int wday; // 1-7
|
||||||
|
|
||||||
|
// 12-hour clock data
|
||||||
|
bool am; // true for AM, false for PM
|
||||||
|
int twelveHour; // 12 hour clock time
|
||||||
|
};
|
||||||
|
|
||||||
|
// statically allocated
|
||||||
|
extern struct tm _tm;
|
||||||
|
|
||||||
|
// Initialize the RTC and autodetect type (DS1307 or DS3231)
|
||||||
|
void rtc_init(void);
|
||||||
|
|
||||||
|
// Autodetection
|
||||||
|
bool rtc_is_ds1307(void);
|
||||||
|
bool rtc_is_ds3231(void);
|
||||||
|
|
||||||
|
void rtc_set_ds1307(void);
|
||||||
|
void rtc_set_ds3231(void);
|
||||||
|
|
||||||
|
// Get/set time
|
||||||
|
// Gets the time: Supports both 24-hour and 12-hour mode
|
||||||
|
struct tm* rtc_get_time(void);
|
||||||
|
// Gets the time: 24-hour mode only
|
||||||
|
void rtc_get_time_s(uint8_t* hour, uint8_t* min, uint8_t* sec);
|
||||||
|
// Sets the time: Supports both 24-hour and 12-hour mode
|
||||||
|
void rtc_set_time(struct tm* tm_);
|
||||||
|
// Sets the time: Supports 12-hour mode only
|
||||||
|
void rtc_set_time_s(uint8_t hour, uint8_t min, uint8_t sec);
|
||||||
|
|
||||||
|
// start/stop clock running (DS1307 only)
|
||||||
|
void rtc_run_clock(bool run);
|
||||||
|
bool rtc_is_clock_running(void);
|
||||||
|
|
||||||
|
// Read Temperature (DS3231 only)
|
||||||
|
void ds3231_get_temp_int(int8_t* i, uint8_t* f);
|
||||||
|
void rtc_force_temp_conversion(uint8_t block);
|
||||||
|
|
||||||
|
// SRAM read/write DS1307 only
|
||||||
|
void rtc_get_sram(uint8_t* data);
|
||||||
|
void rtc_set_sram(uint8_t *data);
|
||||||
|
uint8_t rtc_get_sram_byte(uint8_t offset);
|
||||||
|
void rtc_set_sram_byte(uint8_t b, uint8_t offset);
|
||||||
|
|
||||||
|
// Auxillary functions
|
||||||
|
enum RTC_SQW_FREQ { FREQ_1 = 0, FREQ_1024, FREQ_4096, FREQ_8192 };
|
||||||
|
|
||||||
|
void rtc_SQW_enable(bool enable);
|
||||||
|
void rtc_SQW_set_freq(enum RTC_SQW_FREQ freq);
|
||||||
|
void rtc_osc32kHz_enable(bool enable);
|
||||||
|
|
||||||
|
// Alarm functionality
|
||||||
|
void rtc_reset_alarm(void);
|
||||||
|
void rtc_set_alarm(struct tm* tm_);
|
||||||
|
void rtc_set_alarm_s(uint8_t hour, uint8_t min, uint8_t sec);
|
||||||
|
struct tm* rtc_get_alarm(void);
|
||||||
|
void rtc_get_alarm_s(uint8_t* hour, uint8_t* min, uint8_t* sec);
|
||||||
|
bool rtc_check_alarm(void);
|
||||||
|
|
||||||
|
#endif
|
||||||
476
ds3231/twi-lowlevel.cpp
Normal file
476
ds3231/twi-lowlevel.cpp
Normal file
@ -0,0 +1,476 @@
|
|||||||
|
/*
|
||||||
|
twi.c - TWI/I2C library for Wiring & Arduino
|
||||||
|
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||||
|
|
||||||
|
This library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
This library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with this library; if not, write to the Free Software
|
||||||
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <math.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <inttypes.h>
|
||||||
|
#include <avr/io.h>
|
||||||
|
#include <avr/interrupt.h>
|
||||||
|
#include <compat/twi.h>
|
||||||
|
|
||||||
|
#ifndef cbi
|
||||||
|
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifndef sbi
|
||||||
|
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#include "twi-lowlevel.h"
|
||||||
|
|
||||||
|
static volatile uint8_t twi_state;
|
||||||
|
static uint8_t twi_slarw;
|
||||||
|
|
||||||
|
static void (*twi_onSlaveTransmit)(void);
|
||||||
|
static void (*twi_onSlaveReceive)(uint8_t*, int);
|
||||||
|
|
||||||
|
static uint8_t twi_masterBuffer[TWI_BUFFER_LENGTH];
|
||||||
|
static volatile uint8_t twi_masterBufferIndex;
|
||||||
|
static uint8_t twi_masterBufferLength;
|
||||||
|
|
||||||
|
static uint8_t twi_txBuffer[TWI_BUFFER_LENGTH];
|
||||||
|
static volatile uint8_t twi_txBufferIndex;
|
||||||
|
static volatile uint8_t twi_txBufferLength;
|
||||||
|
|
||||||
|
static uint8_t twi_rxBuffer[TWI_BUFFER_LENGTH];
|
||||||
|
static volatile uint8_t twi_rxBufferIndex;
|
||||||
|
|
||||||
|
static volatile uint8_t twi_error;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_init
|
||||||
|
* Desc readys twi pins and sets twi bitrate
|
||||||
|
* Input none
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_init(void)
|
||||||
|
{
|
||||||
|
// initialize state
|
||||||
|
twi_state = TWI_READY;
|
||||||
|
|
||||||
|
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega8__) || defined(__AVR_ATmega328P__)
|
||||||
|
// activate internal pull-ups for twi
|
||||||
|
// as per note from atmega8 manual pg167
|
||||||
|
sbi(PORTC, 4);
|
||||||
|
sbi(PORTC, 5);
|
||||||
|
#else
|
||||||
|
// activate internal pull-ups for twi
|
||||||
|
// as per note from atmega128 manual pg204
|
||||||
|
sbi(PORTD, 0);
|
||||||
|
sbi(PORTD, 1);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
// initialize twi prescaler and bit rate
|
||||||
|
cbi(TWSR, TWPS0);
|
||||||
|
cbi(TWSR, TWPS1);
|
||||||
|
TWBR = ((CPU_FREQ / TWI_FREQ) - 16) / 2;
|
||||||
|
|
||||||
|
/* twi bit rate formula from atmega128 manual pg 204
|
||||||
|
SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))
|
||||||
|
note: TWBR should be 10 or higher for master mode
|
||||||
|
It is 72 for a 16mhz Wiring board with 100kHz TWI */
|
||||||
|
|
||||||
|
// enable twi module, acks, and twi interrupt
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_slaveInit
|
||||||
|
* Desc sets slave address and enables interrupt
|
||||||
|
* Input none
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_setAddress(uint8_t address)
|
||||||
|
{
|
||||||
|
// set twi slave address (skip over TWGCE bit)
|
||||||
|
TWAR = address << 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_readFrom
|
||||||
|
* Desc attempts to become twi bus master and read a
|
||||||
|
* series of bytes from a device on the bus
|
||||||
|
* Input address: 7bit i2c device address
|
||||||
|
* data: pointer to byte array
|
||||||
|
* length: number of bytes to read into array
|
||||||
|
* Output number of bytes read
|
||||||
|
*/
|
||||||
|
uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length)
|
||||||
|
{
|
||||||
|
uint8_t i;
|
||||||
|
|
||||||
|
// ensure data will fit into buffer
|
||||||
|
if(TWI_BUFFER_LENGTH < length){
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
// wait until twi is ready, become master receiver
|
||||||
|
while(TWI_READY != twi_state){
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
twi_state = TWI_MRX;
|
||||||
|
// reset error state (0xFF.. no error occured)
|
||||||
|
twi_error = 0xFF;
|
||||||
|
|
||||||
|
// initialize buffer iteration vars
|
||||||
|
twi_masterBufferIndex = 0;
|
||||||
|
twi_masterBufferLength = length-1; // This is not intuitive, read on...
|
||||||
|
// On receive, the previously configured ACK/NACK setting is transmitted in
|
||||||
|
// response to the received byte before the interrupt is signalled.
|
||||||
|
// Therefor we must actually set NACK when the _next_ to last byte is
|
||||||
|
// received, causing that NACK to be sent in response to receiving the last
|
||||||
|
// expected byte of data.
|
||||||
|
|
||||||
|
// build sla+w, slave device address + w bit
|
||||||
|
twi_slarw = TW_READ;
|
||||||
|
twi_slarw |= address << 1;
|
||||||
|
|
||||||
|
// send start condition
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTA);
|
||||||
|
|
||||||
|
// wait for read operation to complete
|
||||||
|
while(TWI_MRX == twi_state){
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (twi_masterBufferIndex < length)
|
||||||
|
length = twi_masterBufferIndex;
|
||||||
|
|
||||||
|
// copy twi buffer to data
|
||||||
|
for(i = 0; i < length; ++i){
|
||||||
|
data[i] = twi_masterBuffer[i];
|
||||||
|
}
|
||||||
|
|
||||||
|
return length;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_writeTo
|
||||||
|
* Desc attempts to become twi bus master and write a
|
||||||
|
* series of bytes to a device on the bus
|
||||||
|
* Input address: 7bit i2c device address
|
||||||
|
* data: pointer to byte array
|
||||||
|
* length: number of bytes in array
|
||||||
|
* wait: boolean indicating to wait for write or not
|
||||||
|
* Output 0 .. success
|
||||||
|
* 1 .. length to long for buffer
|
||||||
|
* 2 .. address send, NACK received
|
||||||
|
* 3 .. data send, NACK received
|
||||||
|
* 4 .. other twi error (lost bus arbitration, bus error, ..)
|
||||||
|
*/
|
||||||
|
uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait)
|
||||||
|
{
|
||||||
|
uint8_t i;
|
||||||
|
|
||||||
|
// ensure data will fit into buffer
|
||||||
|
if(TWI_BUFFER_LENGTH < length){
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
// wait until twi is ready, become master transmitter
|
||||||
|
while(TWI_READY != twi_state){
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
twi_state = TWI_MTX;
|
||||||
|
// reset error state (0xFF.. no error occured)
|
||||||
|
twi_error = 0xFF;
|
||||||
|
|
||||||
|
// initialize buffer iteration vars
|
||||||
|
twi_masterBufferIndex = 0;
|
||||||
|
twi_masterBufferLength = length;
|
||||||
|
|
||||||
|
// copy data to twi buffer
|
||||||
|
for(i = 0; i < length; ++i){
|
||||||
|
twi_masterBuffer[i] = data[i];
|
||||||
|
}
|
||||||
|
|
||||||
|
// build sla+w, slave device address + w bit
|
||||||
|
twi_slarw = TW_WRITE;
|
||||||
|
twi_slarw |= address << 1;
|
||||||
|
|
||||||
|
// send start condition
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTA);
|
||||||
|
|
||||||
|
// wait for write operation to complete
|
||||||
|
while(wait && (TWI_MTX == twi_state)){
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (twi_error == 0xFF)
|
||||||
|
return 0; // success
|
||||||
|
else if (twi_error == TW_MT_SLA_NACK)
|
||||||
|
return 2; // error: address send, nack received
|
||||||
|
else if (twi_error == TW_MT_DATA_NACK)
|
||||||
|
return 3; // error: data send, nack received
|
||||||
|
else
|
||||||
|
return 4; // other twi error
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_transmit
|
||||||
|
* Desc fills slave tx buffer with data
|
||||||
|
* must be called in slave tx event callback
|
||||||
|
* Input data: pointer to byte array
|
||||||
|
* length: number of bytes in array
|
||||||
|
* Output 1 length too long for buffer
|
||||||
|
* 2 not slave transmitter
|
||||||
|
* 0 ok
|
||||||
|
*/
|
||||||
|
uint8_t twi_transmit(uint8_t* data, uint8_t length)
|
||||||
|
{
|
||||||
|
uint8_t i;
|
||||||
|
|
||||||
|
// ensure data will fit into buffer
|
||||||
|
if(TWI_BUFFER_LENGTH < length){
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
// ensure we are currently a slave transmitter
|
||||||
|
if(TWI_STX != twi_state){
|
||||||
|
return 2;
|
||||||
|
}
|
||||||
|
|
||||||
|
// set length and copy data into tx buffer
|
||||||
|
twi_txBufferLength = length;
|
||||||
|
for(i = 0; i < length; ++i){
|
||||||
|
twi_txBuffer[i] = data[i];
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_attachSlaveRxEvent
|
||||||
|
* Desc sets function called before a slave read operation
|
||||||
|
* Input function: callback function to use
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_attachSlaveRxEvent( void (*function)(uint8_t*, int) )
|
||||||
|
{
|
||||||
|
twi_onSlaveReceive = function;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_attachSlaveTxEvent
|
||||||
|
* Desc sets function called before a slave write operation
|
||||||
|
* Input function: callback function to use
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_attachSlaveTxEvent( void (*function)(void) )
|
||||||
|
{
|
||||||
|
twi_onSlaveTransmit = function;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_reply
|
||||||
|
* Desc sends byte or readys receive line
|
||||||
|
* Input ack: byte indicating to ack or to nack
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_reply(uint8_t ack)
|
||||||
|
{
|
||||||
|
// transmit master read ready signal, with or without ack
|
||||||
|
if(ack){
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT) | _BV(TWEA);
|
||||||
|
}else{
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_stop
|
||||||
|
* Desc relinquishes bus master status
|
||||||
|
* Input none
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_stop(void)
|
||||||
|
{
|
||||||
|
// send stop condition
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTO);
|
||||||
|
|
||||||
|
// wait for stop condition to be exectued on bus
|
||||||
|
// TWINT is not set after a stop condition!
|
||||||
|
while(TWCR & _BV(TWSTO)){
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
// update twi state
|
||||||
|
twi_state = TWI_READY;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Function twi_releaseBus
|
||||||
|
* Desc releases bus control
|
||||||
|
* Input none
|
||||||
|
* Output none
|
||||||
|
*/
|
||||||
|
void twi_releaseBus(void)
|
||||||
|
{
|
||||||
|
// release bus
|
||||||
|
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT);
|
||||||
|
|
||||||
|
// update twi state
|
||||||
|
twi_state = TWI_READY;
|
||||||
|
}
|
||||||
|
|
||||||
|
SIGNAL(TWI_vect)
|
||||||
|
{
|
||||||
|
switch(TW_STATUS){
|
||||||
|
// All Master
|
||||||
|
case TW_START: // sent start condition
|
||||||
|
case TW_REP_START: // sent repeated start condition
|
||||||
|
// copy device address and r/w bit to output register and ack
|
||||||
|
TWDR = twi_slarw;
|
||||||
|
twi_reply(1);
|
||||||
|
break;
|
||||||
|
|
||||||
|
// Master Transmitter
|
||||||
|
case TW_MT_SLA_ACK: // slave receiver acked address
|
||||||
|
case TW_MT_DATA_ACK: // slave receiver acked data
|
||||||
|
// if there is data to send, send it, otherwise stop
|
||||||
|
if(twi_masterBufferIndex < twi_masterBufferLength){
|
||||||
|
// copy data to output register and ack
|
||||||
|
TWDR = twi_masterBuffer[twi_masterBufferIndex++];
|
||||||
|
twi_reply(1);
|
||||||
|
}else{
|
||||||
|
twi_stop();
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
case TW_MT_SLA_NACK: // address sent, nack received
|
||||||
|
twi_error = TW_MT_SLA_NACK;
|
||||||
|
twi_stop();
|
||||||
|
break;
|
||||||
|
case TW_MT_DATA_NACK: // data sent, nack received
|
||||||
|
twi_error = TW_MT_DATA_NACK;
|
||||||
|
twi_stop();
|
||||||
|
break;
|
||||||
|
case TW_MT_ARB_LOST: // lost bus arbitration
|
||||||
|
twi_error = TW_MT_ARB_LOST;
|
||||||
|
twi_releaseBus();
|
||||||
|
break;
|
||||||
|
|
||||||
|
// Master Receiver
|
||||||
|
case TW_MR_DATA_ACK: // data received, ack sent
|
||||||
|
// put byte into buffer
|
||||||
|
twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
|
||||||
|
case TW_MR_SLA_ACK: // address sent, ack received
|
||||||
|
// ack if more bytes are expected, otherwise nack
|
||||||
|
if(twi_masterBufferIndex < twi_masterBufferLength){
|
||||||
|
twi_reply(1);
|
||||||
|
}else{
|
||||||
|
twi_reply(0);
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
case TW_MR_DATA_NACK: // data received, nack sent
|
||||||
|
// put final byte into buffer
|
||||||
|
twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
|
||||||
|
case TW_MR_SLA_NACK: // address sent, nack received
|
||||||
|
twi_stop();
|
||||||
|
break;
|
||||||
|
// TW_MR_ARB_LOST handled by TW_MT_ARB_LOST case
|
||||||
|
|
||||||
|
// Slave Receiver
|
||||||
|
case TW_SR_SLA_ACK: // addressed, returned ack
|
||||||
|
case TW_SR_GCALL_ACK: // addressed generally, returned ack
|
||||||
|
case TW_SR_ARB_LOST_SLA_ACK: // lost arbitration, returned ack
|
||||||
|
case TW_SR_ARB_LOST_GCALL_ACK: // lost arbitration, returned ack
|
||||||
|
// enter slave receiver mode
|
||||||
|
twi_state = TWI_SRX;
|
||||||
|
// indicate that rx buffer can be overwritten and ack
|
||||||
|
twi_rxBufferIndex = 0;
|
||||||
|
twi_reply(1);
|
||||||
|
break;
|
||||||
|
case TW_SR_DATA_ACK: // data received, returned ack
|
||||||
|
case TW_SR_GCALL_DATA_ACK: // data received generally, returned ack
|
||||||
|
// if there is still room in the rx buffer
|
||||||
|
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
|
||||||
|
// put byte in buffer and ack
|
||||||
|
twi_rxBuffer[twi_rxBufferIndex++] = TWDR;
|
||||||
|
twi_reply(1);
|
||||||
|
}else{
|
||||||
|
// otherwise nack
|
||||||
|
twi_reply(0);
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
case TW_SR_STOP: // stop or repeated start condition received
|
||||||
|
// put a null char after data if there's room
|
||||||
|
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
|
||||||
|
twi_rxBuffer[twi_rxBufferIndex] = '\0';
|
||||||
|
}
|
||||||
|
// sends ack and stops interface for clock stretching
|
||||||
|
twi_stop();
|
||||||
|
// callback to user defined callback
|
||||||
|
twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
|
||||||
|
// since we submit rx buffer to "wire" library, we can reset it
|
||||||
|
twi_rxBufferIndex = 0;
|
||||||
|
// ack future responses and leave slave receiver state
|
||||||
|
twi_releaseBus();
|
||||||
|
break;
|
||||||
|
case TW_SR_DATA_NACK: // data received, returned nack
|
||||||
|
case TW_SR_GCALL_DATA_NACK: // data received generally, returned nack
|
||||||
|
// nack back at master
|
||||||
|
twi_reply(0);
|
||||||
|
break;
|
||||||
|
|
||||||
|
// Slave Transmitter
|
||||||
|
case TW_ST_SLA_ACK: // addressed, returned ack
|
||||||
|
case TW_ST_ARB_LOST_SLA_ACK: // arbitration lost, returned ack
|
||||||
|
// enter slave transmitter mode
|
||||||
|
twi_state = TWI_STX;
|
||||||
|
// ready the tx buffer index for iteration
|
||||||
|
twi_txBufferIndex = 0;
|
||||||
|
// set tx buffer length to be zero, to verify if user changes it
|
||||||
|
twi_txBufferLength = 0;
|
||||||
|
// request for txBuffer to be filled and length to be set
|
||||||
|
// note: user must call twi_transmit(bytes, length) to do this
|
||||||
|
twi_onSlaveTransmit();
|
||||||
|
// if they didn't change buffer & length, initialize it
|
||||||
|
if(0 == twi_txBufferLength){
|
||||||
|
twi_txBufferLength = 1;
|
||||||
|
twi_txBuffer[0] = 0x00;
|
||||||
|
}
|
||||||
|
// transmit first byte from buffer, fall
|
||||||
|
case TW_ST_DATA_ACK: // byte sent, ack returned
|
||||||
|
// copy data to output register
|
||||||
|
TWDR = twi_txBuffer[twi_txBufferIndex++];
|
||||||
|
// if there is more to send, ack, otherwise nack
|
||||||
|
if(twi_txBufferIndex < twi_txBufferLength){
|
||||||
|
twi_reply(1);
|
||||||
|
}else{
|
||||||
|
twi_reply(0);
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
case TW_ST_DATA_NACK: // received nack, we are done
|
||||||
|
case TW_ST_LAST_DATA: // received ack, but we are done already!
|
||||||
|
// ack future responses
|
||||||
|
twi_reply(1);
|
||||||
|
// leave slave receiver state
|
||||||
|
twi_state = TWI_READY;
|
||||||
|
break;
|
||||||
|
|
||||||
|
// All
|
||||||
|
case TW_NO_INFO: // no state information
|
||||||
|
break;
|
||||||
|
case TW_BUS_ERROR: // bus error, illegal stop/start
|
||||||
|
twi_error = TW_BUS_ERROR;
|
||||||
|
twi_stop();
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
57
ds3231/twi-lowlevel.h
Normal file
57
ds3231/twi-lowlevel.h
Normal file
@ -0,0 +1,57 @@
|
|||||||
|
/*
|
||||||
|
twi.h - TWI/I2C library for Wiring & Arduino
|
||||||
|
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||||
|
|
||||||
|
This library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
This library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with this library; if not, write to the Free Software
|
||||||
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef twi_h
|
||||||
|
#define twi_h
|
||||||
|
|
||||||
|
#include <inttypes.h>
|
||||||
|
|
||||||
|
//#define ATMEGA8
|
||||||
|
|
||||||
|
#ifndef CPU_FREQ
|
||||||
|
#define CPU_FREQ 16000000L
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifndef TWI_FREQ
|
||||||
|
#define TWI_FREQ 100000L
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifndef TWI_BUFFER_LENGTH
|
||||||
|
#define TWI_BUFFER_LENGTH 32
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define TWI_READY 0
|
||||||
|
#define TWI_MRX 1
|
||||||
|
#define TWI_MTX 2
|
||||||
|
#define TWI_SRX 3
|
||||||
|
#define TWI_STX 4
|
||||||
|
|
||||||
|
void twi_init(void);
|
||||||
|
void twi_setAddress(uint8_t);
|
||||||
|
uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t);
|
||||||
|
uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t);
|
||||||
|
uint8_t twi_transmit(uint8_t*, uint8_t);
|
||||||
|
void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) );
|
||||||
|
void twi_attachSlaveTxEvent( void (*)(void) );
|
||||||
|
void twi_reply(uint8_t);
|
||||||
|
void twi_stop(void);
|
||||||
|
void twi_releaseBus(void);
|
||||||
|
|
||||||
|
#endif
|
||||||
|
|
||||||
226
ds3231/twi.cpp
Normal file
226
ds3231/twi.cpp
Normal file
@ -0,0 +1,226 @@
|
|||||||
|
/*
|
||||||
|
TwoWire.cpp - TWI/I2C library for Wiring & Arduino
|
||||||
|
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||||
|
|
||||||
|
This library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
This library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with this library; if not, write to the Free Software
|
||||||
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <inttypes.h>
|
||||||
|
#include "twi-lowlevel.h"
|
||||||
|
|
||||||
|
#include "twi.h"
|
||||||
|
|
||||||
|
// local variables
|
||||||
|
uint8_t rxBuffer[BUFFER_LENGTH];
|
||||||
|
uint8_t rxBufferIndex = 0;
|
||||||
|
uint8_t rxBufferLength = 0;
|
||||||
|
|
||||||
|
uint8_t txAddress = 0;
|
||||||
|
uint8_t txBuffer[BUFFER_LENGTH];
|
||||||
|
uint8_t txBufferIndex = 0;
|
||||||
|
uint8_t txBufferLength = 0;
|
||||||
|
|
||||||
|
uint8_t transmitting = 0;
|
||||||
|
void (*user_onRequest)(void);
|
||||||
|
void (*user_onReceive)(int);
|
||||||
|
|
||||||
|
void onRequestService(void);
|
||||||
|
void onReceiveService(uint8_t*, int);
|
||||||
|
|
||||||
|
void twi_init_master(void)
|
||||||
|
{
|
||||||
|
rxBufferIndex = 0;
|
||||||
|
rxBufferLength = 0;
|
||||||
|
|
||||||
|
txBufferIndex = 0;
|
||||||
|
txBufferLength = 0;
|
||||||
|
|
||||||
|
twi_init();
|
||||||
|
}
|
||||||
|
|
||||||
|
void twi_init_slave(uint8_t address)
|
||||||
|
{
|
||||||
|
twi_setAddress(address);
|
||||||
|
twi_attachSlaveTxEvent(onRequestService);
|
||||||
|
twi_attachSlaveRxEvent(onReceiveService);
|
||||||
|
twi_init_master();
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t twi_request_from(uint8_t address, uint8_t quantity)
|
||||||
|
{
|
||||||
|
// clamp to buffer length
|
||||||
|
if(quantity > BUFFER_LENGTH){
|
||||||
|
quantity = BUFFER_LENGTH;
|
||||||
|
}
|
||||||
|
// perform blocking read into buffer
|
||||||
|
uint8_t read = twi_readFrom(address, rxBuffer, quantity);
|
||||||
|
// set rx buffer iterator vars
|
||||||
|
rxBufferIndex = 0;
|
||||||
|
rxBufferLength = read;
|
||||||
|
|
||||||
|
return read;
|
||||||
|
}
|
||||||
|
|
||||||
|
void twi_begin_transmission(uint8_t address)
|
||||||
|
{
|
||||||
|
// indicate that we are transmitting
|
||||||
|
transmitting = 1;
|
||||||
|
// set address of targeted slave
|
||||||
|
txAddress = address;
|
||||||
|
// reset tx buffer iterator vars
|
||||||
|
txBufferIndex = 0;
|
||||||
|
txBufferLength = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
uint8_t twi_end_transmission(void)
|
||||||
|
{
|
||||||
|
// transmit buffer (blocking)
|
||||||
|
int8_t ret = twi_writeTo(txAddress, txBuffer, txBufferLength, 1);
|
||||||
|
// reset tx buffer iterator vars
|
||||||
|
txBufferIndex = 0;
|
||||||
|
txBufferLength = 0;
|
||||||
|
// indicate that we are done transmitting
|
||||||
|
transmitting = 0;
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
// must be called in:
|
||||||
|
// slave tx event callback
|
||||||
|
// or after beginTransmission(address)
|
||||||
|
void twi_send_byte(uint8_t data)
|
||||||
|
{
|
||||||
|
if(transmitting){
|
||||||
|
// in master transmitter mode
|
||||||
|
// don't bother if buffer is full
|
||||||
|
if(txBufferLength >= BUFFER_LENGTH){
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
// put byte in tx buffer
|
||||||
|
txBuffer[txBufferIndex] = data;
|
||||||
|
++txBufferIndex;
|
||||||
|
// update amount in buffer
|
||||||
|
txBufferLength = txBufferIndex;
|
||||||
|
}else{
|
||||||
|
// in slave send mode
|
||||||
|
// reply to master
|
||||||
|
twi_transmit(&data, 1);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// must be called in:
|
||||||
|
// slave tx event callback
|
||||||
|
// or after beginTransmission(address)
|
||||||
|
void twi_send(uint8_t* data, uint8_t quantity)
|
||||||
|
{
|
||||||
|
if(transmitting){
|
||||||
|
// in master transmitter mode
|
||||||
|
for(uint8_t i = 0; i < quantity; ++i){
|
||||||
|
twi_send_byte(data[i]);
|
||||||
|
}
|
||||||
|
}else{
|
||||||
|
// in slave send mode
|
||||||
|
// reply to master
|
||||||
|
twi_transmit(data, quantity);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// must be called in:
|
||||||
|
// slave tx event callback
|
||||||
|
// or after beginTransmission(address)
|
||||||
|
void twi_send_char(char* data)
|
||||||
|
{
|
||||||
|
twi_send((uint8_t*)data, strlen(data));
|
||||||
|
}
|
||||||
|
|
||||||
|
// must be called in:
|
||||||
|
// slave rx event callback
|
||||||
|
// or after requestFrom(address, numBytes)
|
||||||
|
uint8_t twi_available(void)
|
||||||
|
{
|
||||||
|
return rxBufferLength - rxBufferIndex;
|
||||||
|
}
|
||||||
|
|
||||||
|
// must be called in:
|
||||||
|
// slave rx event callback
|
||||||
|
// or after requestFrom(address, numBytes)
|
||||||
|
uint8_t twi_receive(void)
|
||||||
|
{
|
||||||
|
// default to returning null char
|
||||||
|
// for people using with char strings
|
||||||
|
uint8_t value = '\0';
|
||||||
|
|
||||||
|
// get each successive byte on each call
|
||||||
|
if(rxBufferIndex < rxBufferLength){
|
||||||
|
value = rxBuffer[rxBufferIndex];
|
||||||
|
++rxBufferIndex;
|
||||||
|
}
|
||||||
|
|
||||||
|
return value;
|
||||||
|
}
|
||||||
|
|
||||||
|
// behind the scenes function that is called when data is received
|
||||||
|
void onReceiveService(uint8_t* inBytes, int numBytes)
|
||||||
|
{
|
||||||
|
// don't bother if user hasn't registered a callback
|
||||||
|
if(!user_onReceive){
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
// don't bother if rx buffer is in use by a master requestFrom() op
|
||||||
|
// i know this drops data, but it allows for slight stupidity
|
||||||
|
// meaning, they may not have read all the master requestFrom() data yet
|
||||||
|
if(rxBufferIndex < rxBufferLength){
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
// copy twi rx buffer into local read buffer
|
||||||
|
// this enables new reads to happen in parallel
|
||||||
|
for(uint8_t i = 0; i < numBytes; ++i){
|
||||||
|
rxBuffer[i] = inBytes[i];
|
||||||
|
}
|
||||||
|
// set rx iterator vars
|
||||||
|
rxBufferIndex = 0;
|
||||||
|
rxBufferLength = numBytes;
|
||||||
|
// alert user program
|
||||||
|
user_onReceive(numBytes);
|
||||||
|
}
|
||||||
|
|
||||||
|
// behind the scenes function that is called when data is requested
|
||||||
|
void onRequestService(void)
|
||||||
|
{
|
||||||
|
// don't bother if user hasn't registered a callback
|
||||||
|
if(!user_onRequest){
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
// reset tx buffer iterator vars
|
||||||
|
// !!! this will kill any pending pre-master sendTo() activity
|
||||||
|
txBufferIndex = 0;
|
||||||
|
txBufferLength = 0;
|
||||||
|
// alert user program
|
||||||
|
user_onRequest();
|
||||||
|
}
|
||||||
|
|
||||||
|
// sets function called on slave write
|
||||||
|
void twi_set_on_receive( void (*function)(int) )
|
||||||
|
{
|
||||||
|
user_onReceive = function;
|
||||||
|
}
|
||||||
|
|
||||||
|
// sets function called on slave read
|
||||||
|
void twi_set_on_request( void (*function)(void) )
|
||||||
|
{
|
||||||
|
user_onRequest = function;
|
||||||
|
}
|
||||||
|
|
||||||
40
ds3231/twi.h
Normal file
40
ds3231/twi.h
Normal file
@ -0,0 +1,40 @@
|
|||||||
|
/*
|
||||||
|
TwoWire.h - TWI/I2C library for Arduino & Wiring
|
||||||
|
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||||
|
|
||||||
|
This library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
This library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with this library; if not, write to the Free Software
|
||||||
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef TwoWire_h
|
||||||
|
#define TwoWire_h
|
||||||
|
|
||||||
|
#include <inttypes.h>
|
||||||
|
|
||||||
|
#define BUFFER_LENGTH 32
|
||||||
|
|
||||||
|
void twi_init_master(void);
|
||||||
|
void twi_init_slave(uint8_t);
|
||||||
|
void twi_begin_transmission(uint8_t);
|
||||||
|
uint8_t twi_end_transmission(void);
|
||||||
|
uint8_t twi_request_from(uint8_t, uint8_t);
|
||||||
|
void twi_send_byte(uint8_t);
|
||||||
|
void twi_send(uint8_t*, uint8_t);
|
||||||
|
void twi_send_char(char*);
|
||||||
|
uint8_t twi_available(void);
|
||||||
|
uint8_t twi_receive(void);
|
||||||
|
void twi_set_on_receive( void (*)(int) );
|
||||||
|
void twi_set_on_request( void (*)(void) );
|
||||||
|
|
||||||
|
#endif
|
||||||
1
ds3231/usart
Submodule
1
ds3231/usart
Submodule
@ -0,0 +1 @@
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|||||||
|
Subproject commit b2a3b03867858da5d1f8eb955fcbfc106c851ac2
|
||||||
Loading…
Reference in New Issue
Block a user