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Rewrote usart to use interrupts

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This commit is contained in:
BlackMark 2016-05-20 22:27:57 +02:00
parent 97f0b0608b
commit ef24096b04
3 changed files with 193 additions and 61 deletions
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16
usart/main.cpp
View File

@ -10,13 +10,13 @@
int main()
{
USART0 cUSART;
USART0 &cUSART = USART0::inst();
cUSART.init();
uint32_t ui32Counter = 0;
constexpr size_t sizeBufferSize = 64;
char szBuffer[sizeBufferSize];
constexpr size_t sizeBUFFER_SIZE = 64;
char szBuffer[sizeBUFFER_SIZE];
cUSART.transmitString( "\r\nSizes: \r\n" );
@ -83,7 +83,7 @@ int main()
cUSART.transmitString( szBuffer );
cUSART.transmitString( "\" seconds!\r\n" );
if( !cUSART.receiveLine( szBuffer, sizeBufferSize, "\r" ) )
if( !cUSART.receiveLine( szBuffer, sizeBUFFER_SIZE, "\r" ) )
{
cUSART.transmitString( "Receive error: " );
}
@ -95,7 +95,13 @@ int main()
cUSART.transmitString( szBuffer );
cUSART.transmitString( "\r\n" );
_delay_ms( 1000 );
uint8_t ui8Byte;
if( cUSART.receiveByte( ui8Byte, 1000 ) )
{
cUSART.transmitByte( ui8Byte );
cUSART.transmitString( "\r\n" );
}
}
return 0;

187
usart/usart.cpp
View File

@ -1,5 +1,35 @@
#include "usart.h"
//////////////////////////////////////////////////////////////////////////
USART0 USART0::sm_cInstance;
//////////////////////////////////////////////////////////////////////////
USART0::USART0()
{
#ifdef USART_SHAREDIO
m_vui8pUCSRA = &UCSRA;
m_vui8pUCSRB = &UCSRB;
m_vui8pUCSRC = &UCSRC;
m_vui8pUBRRH = &UBRRH;
m_vui8pUBRRL = &UBRRL;
m_vui8pUDR = &UDR;
#endif
#ifndef USART_SHAREDIO
m_vui8pUCSRA = &UCSR0A;
m_vui8pUCSRB = &UCSR0B;
m_vui8pUCSRC = &UCSR0C;
m_vui8pUBRRH = &UBRR0H;
m_vui8pUBRRL = &UBRR0L;
m_vui8pUDR = &UDR0;
#endif
m_vsizeRXBufferHead = 0;
m_vsizeRXBufferTail = 0;
m_vsizeTXBufferHead = 0;
m_vsizeTXBufferTail = 0;
}
//////////////////////////////////////////////////////////////////////////
uint8_t USART0::readUCSRC()
{
@ -51,6 +81,32 @@ void USART0::setTXState( bool bEnable )
}
}
//////////////////////////////////////////////////////////////////////////
void USART0::setRXInterrupt( bool bEnable )
{
if( bEnable )
{
*m_vui8pUCSRB |= ( 1 << RXCIE_D );
}
else
{
*m_vui8pUCSRB &= ~( 1 << RXCIE_D );
}
}
//////////////////////////////////////////////////////////////////////////
void USART0::setUDREInterrupt( bool bEnable )
{
if( bEnable )
{
*m_vui8pUCSRB |= ( 1 << UDRIE_D );
}
else
{
*m_vui8pUCSRB &= ~( 1 << UDRIE_D );
}
}
//////////////////////////////////////////////////////////////////////////
void USART0::setBaudRate( uint32_t ui32BaudRate )
{
@ -180,31 +236,11 @@ void USART0::setMode( Mode enmMode )
}
//////////////////////////////////////////////////////////////////////////
USART0::USART0()
USART0& USART0::inst()
{
#ifdef USART_SHAREDIO
m_vui8pUCSRA = &UCSRA;
m_vui8pUCSRB = &UCSRB;
m_vui8pUCSRC = &UCSRC;
m_vui8pUBRRH = &UBRRH;
m_vui8pUBRRL = &UBRRL;
m_vui8pUDR = &UDR;
#endif
#ifndef USART_SHAREDIO
m_vui8pUCSRA = &UCSR0A;
m_vui8pUCSRB = &UCSR0B;
m_vui8pUCSRC = &UCSR0C;
m_vui8pUBRRH = &UBRR0H;
m_vui8pUBRRL = &UBRR0L;
m_vui8pUDR = &UDR0;
#endif
return sm_cInstance;
}
//////////////////////////////////////////////////////////////////////////
USART0::~USART0()
{}
//////////////////////////////////////////////////////////////////////////
void USART0::init( uint32_t ui32BaudRate /* = 9600 */, uint8_t ui8DataBits /* = 8 */, Parity enmParity /* = Parity::DISABLED */, StopBit enmStopBits /* = StopBit::ONE */, Mode enmMode /* = Mode::ASYNCHRONOUS */ )
{
@ -216,34 +252,42 @@ void USART0::init( uint32_t ui32BaudRate /* = 9600 */, uint8_t ui8DataBits /* =
setRXState( true );
setTXState( true );
setRXInterrupt( true );
setUDREInterrupt( false );
sei();
}
//////////////////////////////////////////////////////////////////////////
bool USART0::receiveByte( uint8_t &ui8Data, uint32_t ui32DelayMS )
bool USART0::receiveByte( uint8_t &ui8Data )
{
const uint8_t ui8ClockCyclesPerIteration = 6;
double dDelayS = ui32DelayMS / 1000.0;
uint32_t ui32Iterations = static_cast<uint32_t>( ( dDelayS * F_CPU ) / ui8ClockCyclesPerIteration );
do
if( m_vsizeRXBufferHead == m_vsizeRXBufferTail )
{
if( ( *m_vui8pUCSRA & ( 1 << RXC_D ) ) )
{
ui8Data = *m_vui8pUDR;
return true;
}
} while( --ui32Iterations > 0 );
return false;
}
ui8Data = m_vui8aRXBuffer[m_vsizeRXBufferTail];
m_vsizeRXBufferTail = ( m_vsizeRXBufferTail + 1 ) % sm_sizeRXBUFFER_SIZE;
return true;
}
//////////////////////////////////////////////////////////////////////////
uint8_t USART0::receiveByte()
bool USART0::receiveByte( uint8_t &ui8Data, uint16_t ui16DelayMS )
{
while( !( *m_vui8pUCSRA & ( 1 << RXC_D ) ) );
uint16_t ui16DelayCounter = 0;
return *m_vui8pUDR;
while( !receiveByte( ui8Data ) )
{
_delay_ms( 1 );
if( ui16DelayCounter++ >= ui16DelayMS )
{
return false;
}
}
return true;
}
//////////////////////////////////////////////////////////////////////////
@ -253,7 +297,10 @@ bool USART0::receiveLine( char *szBuffer, size_t sizeLength, const char *szLineT
while( sizeReceived < sizeMaxSize - 1 && sizeReceived < sizeLength - 1 )
{
szBuffer[sizeReceived++] = receiveByte();
uint8_t ui8ReceiveByte;
while( !receiveByte( ui8ReceiveByte ) );
szBuffer[sizeReceived++] = ui8ReceiveByte;
szBuffer[sizeReceived] = '\0';
if( strstr( szBuffer, szLineTerminator ) )
@ -268,20 +315,70 @@ bool USART0::receiveLine( char *szBuffer, size_t sizeLength, const char *szLineT
//////////////////////////////////////////////////////////////////////////
void USART0::transmitByte( uint8_t ui8Data )
{
while( !( *m_vui8pUCSRA & ( 1 << UDRE_D ) ) );
if( m_vsizeTXBufferHead == m_vsizeTXBufferTail && *m_vui8pUCSRA & ( 1 << UDRE_D ) )
{
*m_vui8pUDR = ui8Data;
return;
}
size_t sizeIndex = ( m_vsizeTXBufferHead + 1 ) % sm_sizeTXBUFFER_SIZE;
while( sizeIndex == m_vsizeTXBufferTail );
m_vui8aTXBuffer[m_vsizeTXBufferHead] = ui8Data;
m_vsizeTXBufferHead = sizeIndex;
setUDREInterrupt( true );
}
//////////////////////////////////////////////////////////////////////////
void USART0::transmitString( const char *szString )
{
while( *szString != '\0' )
while( *szString )
{
transmitByte( *szString++ );
}
}
//////////////////////////////////////////////////////////////////////////
void USART0::receiveInterruptHandler()
{
uint8_t ui8ReceivedByte = *m_vui8pUDR;
size_t sizeIndex = ( m_vsizeRXBufferHead + 1 ) % sm_sizeRXBUFFER_SIZE;
if( sizeIndex != m_vsizeRXBufferTail )
{
m_vui8aRXBuffer[m_vsizeRXBufferHead] = ui8ReceivedByte;
m_vsizeRXBufferHead = sizeIndex;
}
}
//////////////////////////////////////////////////////////////////////////
void USART0::transmitInterruptHandler()
{
uint8_t ui8TransmitByte = m_vui8aTXBuffer[m_vsizeTXBufferTail];
m_vsizeTXBufferTail = ( m_vsizeTXBufferTail + 1 ) % sm_sizeTXBUFFER_SIZE;
*m_vui8pUDR = ui8TransmitByte;
if( m_vsizeTXBufferHead == m_vsizeTXBufferTail )
{
setUDREInterrupt( false );
}
}
//////////////////////////////////////////////////////////////////////////
ISR( USART0_RX_vect_D )
{
USART0::inst().receiveInterruptHandler();
}
//////////////////////////////////////////////////////////////////////////
ISR( USART0_UDRE_vect_D )
{
USART0::inst().transmitInterruptHandler();
}
#ifdef SECOND_USART
//////////////////////////////////////////////////////////////////////////
@ -295,8 +392,4 @@ USART1::USART1()
m_vui8pUDR = &UDR1;
}
//////////////////////////////////////////////////////////////////////////
USART1::~USART1()
{}
#endif

45
usart/usart.h
View File

@ -1,30 +1,41 @@
/*
* Copyright (c) by BlackMark 2015-2016
* Date 20/05/2016
* Version 2.5
* Version 2.6
*/
#ifndef USART_H
#define USART_H
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
#include <string.h>
#include "clock.h"
#if defined (__AVR_ATmega168A__) || defined (__AVR_ATmega328P__) || defined (__AVR_ATmega644P__) || defined (__AVR_ATmega1284P__)
#define USART_SPI
#define USART0_RX_vect_D USART_RX_vect
#define USART0_UDRE_vect_D USART_UDRE_vect
#endif
#if defined (__AVR_ATmega32A__) || (__AVR_ATmega8__)
#define USART_SHAREDIO
#define USART0_RX_vect_D USART_RXC_vect
#define USART0_UDRE_vect_D USART_UDRE_vect
#endif
#if defined (__AVR_ATmega1284P__)
#define SECOND_USART
#define USART0_RX_vect_D USART0_RX_vect
#define USART1_RX_vect_D USART1_RX_vect
#define USART0_UDRE_vect_D USART0_UDRE_vect
#define USART1_UDRE_vect_D USART1_UDRE_vect
#endif
#ifdef USART_SHAREDIO
#define RXEN_D RXEN
#define TXEN_D TXEN
#define RXCIE_D RXCIE
#define UDRIE_D UDRIE
#define UCSZ0_D UCSZ0
#define UCSZ1_D UCSZ1
#define UCSZ2_D UCSZ2
@ -36,6 +47,8 @@
#else
#define RXEN_D RXEN0
#define TXEN_D TXEN0
#define RXCIE_D RXCIE0
#define UDRIE_D UDRIE0
#define UCSZ0_D UCSZ00
#define UCSZ1_D UCSZ01
#define UCSZ2_D UCSZ02
@ -78,6 +91,9 @@ public:
TWO = 2
};
static constexpr size_t sm_sizeRXBUFFER_SIZE = 16;
static constexpr size_t sm_sizeTXBUFFER_SIZE = 16;
protected:
volatile uint8_t *m_vui8pUCSRA;
volatile uint8_t *m_vui8pUCSRB;
@ -86,12 +102,26 @@ protected:
volatile uint8_t *m_vui8pUBRRL;
volatile uint8_t *m_vui8pUDR;
volatile size_t m_vsizeRXBufferHead;
volatile size_t m_vsizeRXBufferTail;
volatile size_t m_vsizeTXBufferHead;
volatile size_t m_vsizeTXBufferTail;
volatile uint8_t m_vui8aRXBuffer[sm_sizeRXBUFFER_SIZE];
volatile uint8_t m_vui8aTXBuffer[sm_sizeTXBUFFER_SIZE];
USART0();
private:
static USART0 sm_cInstance;
uint8_t readUCSRC();
void setUCSRC( uint8_t ui8UCSRC );
void setRXState( bool bEnable );
void setTXState( bool bEnable );
void setRXInterrupt( bool bEnable );
void setUDREInterrupt( bool bEnable );
void setBaudRate( uint32_t ui32BaudRate );
void setDataBits( uint8_t ui8DataBits );
void setParity( Parity enmParity );
@ -99,17 +129,21 @@ private:
void setMode( Mode enmMode );
public:
USART0();
~USART0();
static USART0& inst();
USART0( const USART0& ) = delete;
void operator=( const USART0& ) = delete;
void init( uint32_t ui32BaudRate = 9600, uint8_t ui8DataBits = 8, Parity enmParity = Parity::DISABLED, StopBit enmStopBits = StopBit::ONE, Mode enmMode = Mode::ASYNCHRONOUS );
bool receiveByte( uint8_t &ui8Data, uint32_t ui32DelayMS );
uint8_t receiveByte();
bool receiveByte( uint8_t &ui8Data );
bool receiveByte( uint8_t &ui8Data, uint16_t ui16DelayMS );
bool receiveLine( char *szBuffer, size_t sizeLength, const char *szLineTerminator = "\r\n", size_t sizeMaxSize = 512 );
void transmitByte( uint8_t ui8Data );
void transmitString( const char *szString );
void receiveInterruptHandler();
void transmitInterruptHandler();
};
#ifdef SECOND_USART
@ -118,7 +152,6 @@ class USART1 : public USART0
{
public:
USART1();
~USART1();
};
#endif