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RHHardwareSPI.cpp
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RHHardwareSPI.cpp
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// RHHardwareSPI.cpp
// Author: Mike McCauley (mikem@airspayce.com)
// Copyright (C) 2011 Mike McCauley
// Contributed by Joanna Rutkowska
// $Id: RHHardwareSPI.cpp,v 1.29 2020/08/04 09:02:14 mikem Exp $
#include <RHHardwareSPI.h>
#ifdef RH_HAVE_HARDWARE_SPI
// Declare a single default instance of the hardware SPI interface class
RHHardwareSPI hardware_spi;
#if (RH_PLATFORM == RH_PLATFORM_STM32) // Maple etc
// Declare an SPI interface to use
HardwareSPI SPI(1);
#elif (RH_PLATFORM == RH_PLATFORM_STM32STD) // STM32F4 Discovery
// Declare an SPI interface to use
HardwareSPI SPI(1);
#elif (RH_PLATFORM == RH_PLATFORM_MONGOOSE_OS) // Mongoose OS platform
HardwareSPI SPI(1);
#elif (RH_PLATFORM == RH_PLATFORM_STM32L0) && (defined STM32L082xx || defined STM32L072xx)
extern SPIClass radio_spi; // Created in RH_ABZ.cpp
#define SPI radio_spi
#endif
// Arduino Due has default SPI pins on central SPI headers, and not on 10, 11, 12, 13
// as per other Arduinos
// http://21stdigitalhome.blogspot.com.au/2013/02/arduino-due-hardware-spi.html
#if defined (__arm__) && !defined(CORE_TEENSY) && !defined(SPI_CLOCK_DIV16) && !defined(RH_PLATFORM_NRF52)
// Arduino Due in 1.5.5 has no definitions for SPI dividers
// SPI clock divider is based on MCK of 84MHz
#define SPI_CLOCK_DIV16 (VARIANT_MCK/84000000) // 1MHz
#define SPI_CLOCK_DIV8 (VARIANT_MCK/42000000) // 2MHz
#define SPI_CLOCK_DIV4 (VARIANT_MCK/21000000) // 4MHz
#define SPI_CLOCK_DIV2 (VARIANT_MCK/10500000) // 8MHz
#define SPI_CLOCK_DIV1 (VARIANT_MCK/5250000) // 16MHz
#endif
RHHardwareSPI::RHHardwareSPI(Frequency frequency, BitOrder bitOrder, DataMode dataMode)
:
RHGenericSPI(frequency, bitOrder, dataMode)
{
}
uint8_t RHHardwareSPI::transfer(uint8_t data)
{
return SPI.transfer(data);
}
#if (RH_PLATFORM == RH_PLATFORM_MONGOOSE_OS)
uint8_t RHHardwareSPI::transfer2B(uint8_t byte0, uint8_t byte1)
{
return SPI.transfer2B(byte0, byte1);
}
uint8_t RHHardwareSPI::spiBurstRead(uint8_t reg, uint8_t* dest, uint8_t len)
{
return SPI.spiBurstRead(reg, dest, len);
}
uint8_t RHHardwareSPI::spiBurstWrite(uint8_t reg, const uint8_t* src, uint8_t len)
{
uint8_t status = SPI.spiBurstWrite(reg, src, len);
return status;
}
#endif
void RHHardwareSPI::attachInterrupt()
{
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO || RH_PLATFORM == RH_PLATFORM_NRF52)
SPI.attachInterrupt();
#endif
}
void RHHardwareSPI::detachInterrupt()
{
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO || RH_PLATFORM == RH_PLATFORM_NRF52)
SPI.detachInterrupt();
#endif
}
void RHHardwareSPI::begin()
{
#if defined(SPI_HAS_TRANSACTION)
// Perhaps this is a uniform interface for SPI?
// Currently Teensy and ESP32 only
uint32_t frequency;
if (_frequency == Frequency16MHz)
frequency = 16000000;
else if (_frequency == Frequency8MHz)
frequency = 8000000;
else if (_frequency == Frequency4MHz)
frequency = 4000000;
else if (_frequency == Frequency2MHz)
frequency = 2000000;
else
frequency = 1000000;
#if ((RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined (__arm__) && (defined(ARDUINO_SAM_DUE) || defined(ARDUINO_ARCH_SAMD))) || defined(ARDUINO_ARCH_NRF52) || defined(ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_STM32L0) || defined(NRF52)
// Arduino Due in 1.5.5 has its own BitOrder :-(
// So too does Arduino Zero
// So too does rogerclarkmelbourne/Arduino_STM32
// So too does GrumpyOldPizza/ArduinoCore-stm32l0
::BitOrder bitOrder;
// This no longer relevant: new versions is uint8_t
//#elif (RH_PLATFORM == RH_PLATFORM_ATTINY_MEGA)
// ::BitOrder bitOrder;
#else
uint8_t bitOrder;
#endif
if (_bitOrder == BitOrderLSBFirst)
bitOrder = LSBFIRST;
else
bitOrder = MSBFIRST;
uint8_t dataMode;
if (_dataMode == DataMode0)
dataMode = SPI_MODE0;
else if (_dataMode == DataMode1)
dataMode = SPI_MODE1;
else if (_dataMode == DataMode2)
dataMode = SPI_MODE2;
else if (_dataMode == DataMode3)
dataMode = SPI_MODE3;
else
dataMode = SPI_MODE0;
// Save the settings for use in transactions
_settings = SPISettings(frequency, bitOrder, dataMode);
SPI.begin();
#else // SPI_HAS_TRANSACTION
// Sigh: there are no common symbols for some of these SPI options across all platforms
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) || (RH_PLATFORM == RH_PLATFORM_UNO32) || (RH_PLATFORM == RH_PLATFORM_CHIPKIT_CORE || RH_PLATFORM == RH_PLATFORM_NRF52)
uint8_t dataMode;
if (_dataMode == DataMode0)
dataMode = SPI_MODE0;
else if (_dataMode == DataMode1)
dataMode = SPI_MODE1;
else if (_dataMode == DataMode2)
dataMode = SPI_MODE2;
else if (_dataMode == DataMode3)
dataMode = SPI_MODE3;
else
dataMode = SPI_MODE0;
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined(__arm__) && defined(CORE_TEENSY)
// Temporary work-around due to problem where avr_emulation.h does not work properly for the setDataMode() cal
SPCR &= ~SPI_MODE_MASK;
#else
#if ((RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined (__arm__) && defined(ARDUINO_ARCH_SAMD)) || defined(ARDUINO_ARCH_NRF52)
// Zero requires begin() before anything else :-)
SPI.begin();
#endif
SPI.setDataMode(dataMode);
#endif
#if ((RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined (__arm__) && (defined(ARDUINO_SAM_DUE) || defined(ARDUINO_ARCH_SAMD))) || defined(ARDUINO_ARCH_NRF52) || defined (ARDUINO_ARCH_STM32) || defined(ARDUINO_ARCH_STM32F4) || defined(ARDUINO_ARCH_STM32F1)
// Arduino Due in 1.5.5 has its own BitOrder :-(
// So too does Arduino Zero
// So too does rogerclarkmelbourne/Arduino_STM32
// So too does stm32duino F1, F4
::BitOrder bitOrder;
#else
uint8_t bitOrder;
#endif
if (_bitOrder == BitOrderLSBFirst)
bitOrder = LSBFIRST;
else
bitOrder = MSBFIRST;
SPI.setBitOrder(bitOrder);
uint8_t divider;
switch (_frequency)
{
case Frequency1MHz:
default:
#if F_CPU == 8000000
divider = SPI_CLOCK_DIV8;
#else
divider = SPI_CLOCK_DIV16;
#endif
break;
case Frequency2MHz:
#if F_CPU == 8000000
divider = SPI_CLOCK_DIV4;
#else
divider = SPI_CLOCK_DIV8;
#endif
break;
case Frequency4MHz:
#if F_CPU == 8000000
divider = SPI_CLOCK_DIV2;
#else
divider = SPI_CLOCK_DIV4;
#endif
break;
case Frequency8MHz:
divider = SPI_CLOCK_DIV2; // 4MHz on an 8MHz Arduino
break;
case Frequency16MHz:
divider = SPI_CLOCK_DIV2; // Not really 16MHz, only 8MHz. 4MHz on an 8MHz Arduino
break;
}
SPI.setClockDivider(divider);
SPI.begin();
// Teensy requires it to be set _after_ begin()
SPI.setClockDivider(divider);
#elif (RH_PLATFORM == RH_PLATFORM_STM32) // Maple etc
spi_mode dataMode;
// Hmmm, if we do this as a switch, GCC on maple gets v confused!
if (_dataMode == DataMode0)
dataMode = SPI_MODE_0;
else if (_dataMode == DataMode1)
dataMode = SPI_MODE_1;
else if (_dataMode == DataMode2)
dataMode = SPI_MODE_2;
else if (_dataMode == DataMode3)
dataMode = SPI_MODE_3;
else
dataMode = SPI_MODE_0;
uint32 bitOrder;
if (_bitOrder == BitOrderLSBFirst)
bitOrder = LSBFIRST;
else
bitOrder = MSBFIRST;
SPIFrequency frequency; // Yes, I know these are not exact equivalents.
switch (_frequency)
{
case Frequency1MHz:
default:
frequency = SPI_1_125MHZ;
break;
case Frequency2MHz:
frequency = SPI_2_25MHZ;
break;
case Frequency4MHz:
frequency = SPI_4_5MHZ;
break;
case Frequency8MHz:
frequency = SPI_9MHZ;
break;
case Frequency16MHz:
frequency = SPI_18MHZ;
break;
}
SPI.begin(frequency, bitOrder, dataMode);
#elif (RH_PLATFORM == RH_PLATFORM_STM32STD) // STM32F4 discovery
uint8_t dataMode;
if (_dataMode == DataMode0)
dataMode = SPI_MODE0;
else if (_dataMode == DataMode1)
dataMode = SPI_MODE1;
else if (_dataMode == DataMode2)
dataMode = SPI_MODE2;
else if (_dataMode == DataMode3)
dataMode = SPI_MODE3;
else
dataMode = SPI_MODE0;
uint32_t bitOrder;
if (_bitOrder == BitOrderLSBFirst)
bitOrder = LSBFIRST;
else
bitOrder = MSBFIRST;
SPIFrequency frequency; // Yes, I know these are not exact equivalents.
switch (_frequency)
{
case Frequency1MHz:
default:
frequency = SPI_1_3125MHZ;
break;
case Frequency2MHz:
frequency = SPI_2_625MHZ;
break;
case Frequency4MHz:
frequency = SPI_5_25MHZ;
break;
case Frequency8MHz:
frequency = SPI_10_5MHZ;
break;
case Frequency16MHz:
frequency = SPI_21_0MHZ;
break;
}
SPI.begin(frequency, bitOrder, dataMode);
#elif (RH_PLATFORM == RH_PLATFORM_STM32F2) // Photon
uint8_t dataMode;
if (_dataMode == DataMode0)
dataMode = SPI_MODE0;
else if (_dataMode == DataMode1)
dataMode = SPI_MODE1;
else if (_dataMode == DataMode2)
dataMode = SPI_MODE2;
else if (_dataMode == DataMode3)
dataMode = SPI_MODE3;
else
dataMode = SPI_MODE0;
SPI.setDataMode(dataMode);
if (_bitOrder == BitOrderLSBFirst)
SPI.setBitOrder(LSBFIRST);
else
SPI.setBitOrder(MSBFIRST);
switch (_frequency)
{
case Frequency1MHz:
default:
SPI.setClockSpeed(1, MHZ);
break;
case Frequency2MHz:
SPI.setClockSpeed(2, MHZ);
break;
case Frequency4MHz:
SPI.setClockSpeed(4, MHZ);
break;
case Frequency8MHz:
SPI.setClockSpeed(8, MHZ);
break;
case Frequency16MHz:
SPI.setClockSpeed(16, MHZ);
break;
}
// SPI.setClockDivider(SPI_CLOCK_DIV4); // 72MHz / 4MHz = 18MHz
// SPI.setClockSpeed(1, MHZ);
SPI.begin();
#elif (RH_PLATFORM == RH_PLATFORM_ESP8266)
// Requires SPI driver for ESP8266 from https://github.com/esp8266/Arduino/tree/master/libraries/SPI
// Which ppears to be in Arduino Board Manager ESP8266 Community version 2.1.0
// Contributed by David Skinner
// begin comes first
SPI.begin();
// datamode
switch ( _dataMode )
{
case DataMode1:
SPI.setDataMode ( SPI_MODE1 );
break;
case DataMode2:
SPI.setDataMode ( SPI_MODE2 );
break;
case DataMode3:
SPI.setDataMode ( SPI_MODE3 );
break;
case DataMode0:
default:
SPI.setDataMode ( SPI_MODE0 );
break;
}
// bitorder
SPI.setBitOrder(_bitOrder == BitOrderLSBFirst ? LSBFIRST : MSBFIRST);
// frequency (this sets the divider)
switch (_frequency)
{
case Frequency1MHz:
default:
SPI.setFrequency(1000000);
break;
case Frequency2MHz:
SPI.setFrequency(2000000);
break;
case Frequency4MHz:
SPI.setFrequency(4000000);
break;
case Frequency8MHz:
SPI.setFrequency(8000000);
break;
case Frequency16MHz:
SPI.setFrequency(16000000);
break;
}
#elif (RH_PLATFORM == RH_PLATFORM_RASPI) // Raspberry PI
uint8_t dataMode;
if (_dataMode == DataMode0)
dataMode = BCM2835_SPI_MODE0;
else if (_dataMode == DataMode1)
dataMode = BCM2835_SPI_MODE1;
else if (_dataMode == DataMode2)
dataMode = BCM2835_SPI_MODE2;
else if (_dataMode == DataMode3)
dataMode = BCM2835_SPI_MODE3;
uint8_t bitOrder;
if (_bitOrder == BitOrderLSBFirst)
bitOrder = BCM2835_SPI_BIT_ORDER_LSBFIRST;
else
bitOrder = BCM2835_SPI_BIT_ORDER_MSBFIRST;
uint32_t divider;
switch (_frequency)
{
case Frequency1MHz:
default:
divider = BCM2835_SPI_CLOCK_DIVIDER_256;
break;
case Frequency2MHz:
divider = BCM2835_SPI_CLOCK_DIVIDER_128;
break;
case Frequency4MHz:
divider = BCM2835_SPI_CLOCK_DIVIDER_64;
break;
case Frequency8MHz:
divider = BCM2835_SPI_CLOCK_DIVIDER_32;
break;
case Frequency16MHz:
divider = BCM2835_SPI_CLOCK_DIVIDER_16;
break;
}
SPI.begin(divider, bitOrder, dataMode);
#elif (RH_PLATFORM == RH_PLATFORM_MONGOOSE_OS)
uint8_t dataMode = SPI_MODE0;
uint32_t frequency = 4000000; //!!! ESP32/NRF902 works ok at 4MHz but not at 8MHz SPI clock.
uint32_t bitOrder = MSBFIRST;
if (_dataMode == DataMode0) {
dataMode = SPI_MODE0;
} else if (_dataMode == DataMode1) {
dataMode = SPI_MODE1;
} else if (_dataMode == DataMode2) {
dataMode = SPI_MODE2;
} else if (_dataMode == DataMode3) {
dataMode = SPI_MODE3;
}
if (_bitOrder == BitOrderLSBFirst) {
bitOrder = LSBFIRST;
}
if (_frequency == Frequency4MHz)
frequency = 4000000;
else if (_frequency == Frequency2MHz)
frequency = 2000000;
else
frequency = 1000000;
SPI.begin(frequency, bitOrder, dataMode);
#else
#warning RHHardwareSPI does not support this platform yet. Consider adding it and contributing a patch.
#endif
#endif // SPI_HAS_TRANSACTION
}
void RHHardwareSPI::end()
{
return SPI.end();
}
void RHHardwareSPI::beginTransaction()
{
#if defined(SPI_HAS_TRANSACTION)
SPI.beginTransaction(_settings);
#endif
}
void RHHardwareSPI::endTransaction()
{
#if defined(SPI_HAS_TRANSACTION)
SPI.endTransaction();
#endif
}
void RHHardwareSPI::usingInterrupt(uint8_t interrupt)
{
#if defined(SPI_HAS_TRANSACTION) && !defined(RH_MISSING_SPIUSINGINTERRUPT)
SPI.usingInterrupt(interrupt);
#endif
(void)interrupt;
}
#endif