Make use of C++ standard library

config.hpp

@@ -0,0 +1,63 @@
+#pragma once
+
+#include <cstdint>
+
+#include "../io/io.hpp"
+
+namespace spi {
+
+enum class ClockDiv {
+	DIV_4 = 0,
+	DIV_16 = 1,
+	DIV_64 = 2,
+	DIV_128 = 3,
+
+	DIV_2X_2 = 4,
+	DIV_2X_8 = 5,
+	DIV_2X_32 = 6,
+	DIV_2X_64 = 7,
+};
+
+enum class Mode {
+	MODE_0 = 0,
+	MODE_1 = 1,
+	MODE_2 = 2,
+	MODE_3 = 3,
+};
+
+enum class Side {
+	MASTER,
+	SLAVE,
+};
+
+enum class BitOrder {
+	LSB_FIRST,
+	MSB_FIRST,
+};
+
+template <ClockDiv freq = ClockDiv::DIV_128, Mode mode = Mode::MODE_0, Side side = Side::MASTER,
+          BitOrder bitOrder = BitOrder::MSB_FIRST, io::P ssPin = io::P::B2, bool pullup = false>
+struct HardwareConfig {
+	static constexpr auto FREQ = freq;
+	static constexpr auto MODE = mode;
+	static constexpr auto SIDE = side;
+	static constexpr auto BIT_ORDER = bitOrder;
+	static constexpr auto SS_PIN = ssPin;
+	static constexpr auto PULLUP = pullup;
+};
+
+template <io::P sckPin, io::P misoPin, io::P mosiPin, io::P ssPin, std::uint32_t freq = 100'000,
+          Mode mode = Mode::MODE_0, BitOrder bitOrder = BitOrder::MSB_FIRST, std::uint8_t bits = 8, bool pullup = false>
+struct SoftwareConfig {
+	static constexpr auto SCK_PIN = sckPin;
+	static constexpr auto MISO_PIN = misoPin;
+	static constexpr auto MOSI_PIN = mosiPin;
+	static constexpr auto SS_PIN = ssPin;
+	static constexpr auto FREQ = freq;
+	static constexpr auto MODE = mode;
+	static constexpr auto BIT_ORDER = bitOrder;
+	static constexpr auto BITS = bits;
+	static constexpr auto PULLUP = pullup;
+};
+
+} // namespace spi

hardware.hpp

@@ -0,0 +1,139 @@
+#pragma once
+
+#include <cstdint>
+
+#include "../io/io.hpp"
+
+namespace spi {
+
+#if defined(__AVR_ATmega328P__)
+
+template <class Cfg>
+class Hardware {
+  public:
+	using word_t = std::uint8_t;
+
+	static void init()
+	{
+		if constexpr (Cfg::SIDE == Side::MASTER) {
+			sm_ss = true;
+
+			sm_sck.dir(io::Dir::OUT);
+			sm_miso.dir(io::Dir::IN);
+			sm_miso.pullup(Cfg::PULLUP);
+			sm_mosi.dir(io::Dir::OUT);
+			sm_ss.dir(io::Dir::OUT);
+		} else {
+			sm_sck.dir(io::Dir::IN);
+			sm_miso.dir(io::Dir::OUT);
+			sm_mosi.dir(io::Dir::IN);
+			sm_ss.dir(io::Dir::IN);
+			sm_ss.pullup(true);
+		}
+
+		setClockDiv();
+		setMode();
+		setMaster();
+		setBitOrder();
+
+		SPCR = SPCR | (1 << SPE);
+	}
+
+	static word_t transfer(word_t data)
+	{
+		SPDR = data;
+		while (!(SPSR & (1 << SPIF)))
+			;
+		return SPDR;
+	}
+
+	static void select(bool selectState)
+	{
+		sm_ss = !selectState;
+	}
+
+  private:
+	static io::Pin<io::P::B5> sm_sck;
+	static io::Pin<io::P::B4> sm_miso;
+	static io::Pin<io::P::B3> sm_mosi;
+	static io::Pin<Cfg::SS_PIN> sm_ss;
+
+	static void setClockDiv()
+	{
+		std::uint8_t ui8ClockDiv = static_cast<std::uint8_t>(Cfg::FREQ);
+
+		if (ui8ClockDiv & 1) {
+			SPCR = SPCR | (1 << SPR0);
+		} else {
+			SPCR = SPCR & ~(1 << SPR0);
+		}
+
+		if (ui8ClockDiv & (1 << 1)) {
+			SPCR = SPCR | (1 << SPR1);
+		} else {
+			SPCR = SPCR & ~(1 << SPR1);
+		}
+
+		if (ui8ClockDiv & (1 << 2)) {
+			SPSR = SPSR | (1 << SPI2X);
+		} else {
+			SPSR = SPSR & ~(1 << SPI2X);
+		}
+	}
+
+	static void setMode()
+	{
+		if (Cfg::MODE == Mode::MODE_0 || Cfg::MODE == Mode::MODE_1) {
+			setCPOL(false);
+		} else {
+			setCPOL(true);
+		}
+
+		if (Cfg::MODE == Mode::MODE_0 || Cfg::MODE == Mode::MODE_2) {
+			setCPHA(false);
+		} else {
+			setCPHA(true);
+		}
+	}
+
+	static void setMaster()
+	{
+		if constexpr (Cfg::SIDE == Side::MASTER) {
+			SPCR = SPCR | (1 << MSTR);
+		} else {
+			SPCR = SPCR & ~(1 << MSTR);
+		}
+	}
+
+	static void setBitOrder()
+	{
+		if constexpr (Cfg::BIT_ORDER == BitOrder::LSB_FIRST) {
+			SPCR = SPCR | (1 << DORD);
+		} else {
+			SPCR = SPCR & ~(1 << DORD);
+		}
+	}
+
+	static void setCPOL(bool bCPOL)
+	{
+		if (bCPOL) {
+			SPCR = SPCR | (1 << CPOL);
+		} else {
+			SPCR = SPCR & ~(1 << CPOL);
+		}
+	}
+	static void setCPHA(bool bCPHA)
+	{
+		if (bCPHA) {
+			SPCR = SPCR | (1 << CPHA);
+		} else {
+			SPCR = SPCR & ~(1 << CPHA);
+		}
+	}
+};
+
+#else
+#error "This chip is not supported"
+#endif
+
+} // namespace spi

software.hpp

@@ -0,0 +1,114 @@
+#pragma once
+
+#include "../clock.hpp"
+
+#include <type_traits>
+#include <utility>
+
+#include <cstdint>
+
+#include <avr/interrupt.h>
+
+#include "../io/io.hpp"
+#include "../util/util.hpp"
+
+namespace spi {
+
+template <typename Cfg>
+class Software {
+	static constexpr double calcClockDelay()
+	{
+		constexpr auto staticClockCycles = 10;
+		constexpr auto maxFrequency = F_CPU / staticClockCycles;
+		static_assert(Cfg::FREQ <= maxFrequency, "SPI frequency not achievable using selected clock speed");
+		constexpr auto staticDelay = (1.0 * 1000 * 1000 / maxFrequency);
+		const auto delayUs = ((1.0 * 1000 * 1000 / Cfg::FREQ) - staticDelay) / 2;
+		return (delayUs > 0 ? delayUs : 0);
+	}
+
+  public:
+	static_assert(Cfg::BITS >= 1 && Cfg::BITS <= 64, "Word size must be in range [1-64]");
+	// clang-format off
+	using word_t = std::conditional_t<Cfg::BITS <=  8, std::uint8_t,
+	               std::conditional_t<Cfg::BITS <= 16, std::uint16_t,
+	               std::conditional_t<Cfg::BITS <= 32, std::uint32_t,
+	                                                   std::uint64_t>>>;
+	// clang-format on
+
+	static void init()
+	{
+		sm_sck = ((Cfg::MODE == Mode::MODE_0 || Cfg::MODE == Mode::MODE_1) ? false : true);
+		sm_ss = true;
+
+		sm_sck.dir(io::Dir::OUT);
+		sm_miso.dir(io::Dir::IN);
+		sm_miso.pullup(Cfg::PULLUP);
+		sm_mosi.dir(io::Dir::OUT);
+		sm_ss.dir(io::Dir::OUT);
+	}
+
+	static word_t transfer(const word_t data)
+	{
+		const auto oldInterruptState = disableInterrupts();
+
+		auto dataIn = word_t{};
+
+		util::for_constexpr(
+		    [&](const auto idx) {
+			    constexpr auto i = idx.value;
+			    constexpr auto bitPos = (Cfg::BIT_ORDER == BitOrder::MSB_FIRST ? Cfg::BITS - i - 1 : i);
+
+			    if constexpr (Cfg::MODE == Mode::MODE_0 || Cfg::MODE == Mode::MODE_2) {
+				    sm_mosi = data >> bitPos & 1;
+				    _delay_us(DELAY_US);
+				    sm_sck.toggle();
+
+				    const auto receivedBit = sm_miso.read();
+				    dataIn |= word_t{receivedBit} << bitPos;
+				    _delay_us(DELAY_US);
+				    sm_sck.toggle();
+			    } else {
+				    sm_sck.toggle();
+				    sm_mosi = data >> bitPos & 1;
+				    _delay_us(DELAY_US);
+
+				    sm_sck.toggle();
+				    const auto receivedBit = sm_miso.read();
+				    dataIn |= word_t{receivedBit} << bitPos;
+				    _delay_us(DELAY_US);
+			    }
+		    },
+		    std::make_index_sequence<Cfg::BITS>{});
+
+		enableInterrupts(oldInterruptState);
+
+		return dataIn;
+	}
+
+	static void select(const bool selectState)
+	{
+		sm_ss = !selectState;
+	}
+
+  private:
+	static io::Pin<Cfg::SCK_PIN> sm_sck;
+	static io::Pin<Cfg::MISO_PIN> sm_miso;
+	static io::Pin<Cfg::MOSI_PIN> sm_mosi;
+	static io::Pin<Cfg::SS_PIN> sm_ss;
+
+	static constexpr auto DELAY_US = calcClockDelay();
+
+	static inline std::uint8_t disableInterrupts()
+	{
+		const auto oldInterruptState = SREG;
+		cli();
+		return oldInterruptState;
+	}
+
+	static inline void enableInterrupts(const std::uint8_t oldInterruptState)
+	{
+		SREG = oldInterruptState;
+	}
+};
+
+} // namespace spi

spi.cpp

@@ -1,172 +0,0 @@
-#include "spi.h"
-
-//////////////////////////////////////////////////////////////////////////
-InOutPin SPI::sm_cSCK;
-InOutPin SPI::sm_cMISO;
-InOutPin SPI::sm_cMOSI;
-InOutPin SPI::sm_cSS;
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::setCPOL( bool bCPOL )
-{
-	if( bCPOL )
-	{
-		SPCR |= ( 1 << CPOL );
-	}
-	else
-	{
-		SPCR &= ~( 1 << CPOL );
-	}
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::setCPHA( bool bCPHA )
-{
-	if( bCPHA )
-	{
-		SPCR |= ( 1 << CPHA );
-	}
-	else
-	{
-		SPCR &= ~( 1 << CPHA );
-	}
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::init( ClockDiv enmClockDiv /* = ClockDiv::CLKDIV_128 */, Mode enmMode /* = Mode::MODE_0 */, bool bMaster /* = true */, bool bLSBFirst /* = false */, bool bMISOPullup /* = false */ )
-{
-	sm_cSCK.setPin( sm_enmSCK );
-	sm_cMISO.setPin( sm_enmMISO );
-	sm_cMOSI.setPin( sm_enmMOSI );
-	sm_cSS.setPin( sm_enmSS );
-
-	if( bMaster )
-	{
-		sm_cSS.write( true );
-
-		sm_cSCK.setDirection( InOut::Dir::D_OUT, false );
-		sm_cMISO.setDirection( InOut::Dir::D_IN, bMISOPullup );
-		sm_cMOSI.setDirection( InOut::Dir::D_OUT, false );
-		sm_cSS.setDirection( InOut::Dir::D_OUT, false );
-	}
-	else
-	{
-		sm_cSCK.setDirection( InOut::Dir::D_IN, false );
-		sm_cMISO.setDirection( InOut::Dir::D_OUT, false );
-		sm_cMOSI.setDirection( InOut::Dir::D_IN, false );
-		sm_cSS.setDirection( InOut::Dir::D_IN, true );
-	}
-
-	setClockDiv( enmClockDiv );
-	setMode( enmMode );
-	setMaster( bMaster );
-	setBitOrder( bLSBFirst );
-
-	SPCR |= ( 1 << SPE );
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::deinit()
-{
-	SPCR = 0;
-
-	sm_cSCK.setDirection( InOut::Dir::D_IN, false );
-	sm_cMISO.setDirection( InOut::Dir::D_IN, false );
-	sm_cMOSI.setDirection( InOut::Dir::D_IN, false );
-	sm_cSS.setDirection( InOut::Dir::D_IN, false );
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::setClockDiv( ClockDiv enmClockDiv )
-{
-	uint8_t ui8ClockDiv = static_cast<uint8_t>( enmClockDiv );
-
-	if( ui8ClockDiv & 1 )
-	{
-		SPCR |= ( 1 << SPR0 );
-	}
-	else
-	{
-		SPCR &= ~( 1 << SPR0 );
-	}
-
-	if( ui8ClockDiv & ( 1 << 1 ) )
-	{
-		SPCR |= ( 1 << SPR1 );
-	}
-	else
-	{
-		SPCR &= ~( 1 << SPR1 );
-	}
-
-	if( ui8ClockDiv & ( 1 << 2 ) )
-	{
-		SPSR |= ( 1 << SPI2X );
-	}
-	else
-	{
-		SPSR &= ~( 1 << SPI2X );
-	}
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::setMode( Mode enmMode )
-{
-	if( enmMode == Mode::MODE_0 || enmMode == Mode::MODE_1 )
-	{
-		setCPOL( false );
-	}
-	else
-	{
-		setCPOL( true );
-	}
-
-	if( enmMode == Mode::MODE_0 || enmMode == Mode::MODE_2 )
-	{
-		setCPHA( false );
-	}
-	else
-	{
-		setCPHA( true );
-	}
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::setMaster( bool bMaster )
-{
-	if( bMaster )
-	{
-		SPCR |= ( 1 << MSTR );
-	}
-	else
-	{
-		SPCR &= ~( 1 << MSTR );
-	}
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::setBitOrder( bool bLSBFirst )
-{
-	if( bLSBFirst )
-	{
-		SPCR |= ( 1 << DORD );
-	}
-	else
-	{
-		SPCR &= ~( 1 << DORD );
-	}
-}
-
-//////////////////////////////////////////////////////////////////////////
-uint8_t SPI::transfer( uint8_t ui8Data )
-{
-	SPDR = ui8Data;
-	while( !( SPSR & ( 1 << SPIF ) ) );
-	return SPDR;
-}
-
-//////////////////////////////////////////////////////////////////////////
-void SPI::select( bool bSelect )
-{
-	sm_cSS.write( !bSelect );
-}

spi.h

@@ -1,64 +0,0 @@
-/*
-* Copyright (c) by BlackMark 2016-2017
-* Date 17/09/2017
-* Version 1.4
-*/
-
-#ifndef SPI_H
-#define SPI_H
-
-#include <avr/io.h>
-#include "../inout/inout.h"
-
-class SPI
-{
-public:
-	enum class ClockDiv
-	{
-		CLKDIV_4 = 0,
-		CLKDIV_16 = 1,
-		CLKDIV_64 = 2,
-		CLKDIV_128 = 3,
-
-		CLKDIV_2X_2 = 4,
-		CLKDIV_2X_8 = 5,
-		CLKDIV_2X_32 = 6,
-		CLKDIV_2X_64 = 7
-	};
-
-	enum class Mode
-	{
-		MODE_0 = 0,
-		MODE_1 = 1,
-		MODE_2 = 2,
-		MODE_3 = 3
-	};
-
-private:
-	static void setCPOL( bool bCPOL );
-	static void setCPHA( bool bCPHA );
-
-	static constexpr InOut::Pin sm_enmSCK = InOut::Pin::P_B5;
-	static constexpr InOut::Pin sm_enmMISO = InOut::Pin::P_B4;
-	static constexpr InOut::Pin sm_enmMOSI = InOut::Pin::P_B3;
-	static constexpr InOut::Pin sm_enmSS = InOut::Pin::P_B2;
-
-	static InOutPin sm_cSCK;
-	static InOutPin sm_cMISO;
-	static InOutPin sm_cMOSI;
-	static InOutPin sm_cSS;
-
-public:
-	static void init( ClockDiv enmClockDiv = ClockDiv::CLKDIV_128, Mode enmMode = Mode::MODE_0, bool bMaster = true, bool bLSBFirst = false, bool bMISOPullup = false );
-	static void deinit();
-	static void setClockDiv( ClockDiv enmClockDiv );
-	static void setMode( Mode enmMode );
-	static void setMaster( bool bMaster );
-	static void setBitOrder( bool bLSBFirst );
-
-	static uint8_t transfer( uint8_t ui8Data );
-
-	static void select( bool bSelect );
-};
-
-#endif

spi.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "config.hpp"
+#include "hardware.hpp"
+#include "software.hpp"
+
+#include "../io/io.hpp"
+
+namespace spi {
+
+template <class Driver>
+struct Spi {
+	using word_t = typename Driver::word_t;
+
+	static inline void init()
+	{
+		Driver::init();
+	}
+
+	static inline word_t transfer(const word_t data)
+	{
+		return Driver::transfer(data);
+	}
+
+	static inline void select(const bool selectState)
+	{
+		Driver::select(selectState);
+	}
+};
+
+} // namespace spi