Point Labs / RadioHeadLite

This driver is a stripped down version of the Radiohead 1.45 driver, and covers fewer radios. Threading and an event queue have been added to make the ISR's more stable across architectures. Specifically The STM32L4 parts

Dependents:   Threaded_LoRa_Modem

RHHardwareSPI.cpp

Committer:
rlanders73
Date:
2021-05-29
Revision:
2:403a13ad43e6
Parent:
1:dfeb5e8b199a
Child:
3:6ffa8c82a713

File content as of revision 2:403a13ad43e6:

// RHHardwareSPI.h
// Author: Mike McCauley (mikem@airspayce.com)
// Copyright (C) 2011 Mike McCauley
// Contributed by Joanna Rutkowska
// $Id: RHHardwareSPI.cpp,v 1.12 2015/07/01 00:46:05 mikem Exp $

#include <RHHardwareSPI.h>

// Declare a single default instance of the hardware SPI interface class
RHHardwareSPI hardware_spi;

#ifdef RH_HAVE_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_MBED) // MBed
// grab config from mbed_app.json
SPI _SPI(RADIO_MOSI, RADIO_MISO, RADIO_SCLK);

#define REVERSE_BITS(byte) (((reverse_lookup[(byte & 0x0F)]) << 4) + reverse_lookup[((byte & 0xF0) >> 4)])
    
static const uint8_t reverse_lookup[] = { 0, 8,  4, 12, 2, 10, 6, 14,1, 9, 5, 13,3, 11, 7, 15 };

#endif

// Arduino Due has default SPI pins on central SPI headers, and not on 10, 11, 12, 13
// as per otherArduinos
// http://21stdigitalhome.blogspot.com.au/2013/02/arduino-due-hardware-SPI.html
#if defined (__arm__) && !defined(CORE_TEENSY)
 // 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) 
{
#if (RH_PLATFORM == RH_PLATFORM_MBED)
    if (_bitOrder == BitOrderLSBFirst)
    	data = REVERSE_BITS(data);
	
	return _SPI.write(data);
#else
    return _SPI.transfer(data);
#endif
}

void RHHardwareSPI::attachInterrupt() 
{
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO)
    _SPI.attachInterrupt();
#endif
}

void RHHardwareSPI::detachInterrupt() 
{
#if (RH_PLATFORM == RH_PLATFORM_ARDUINO)
    _SPI.detachInterrupt();
#endif
}
    
void RHHardwareSPI::begin() 
{
    // 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)
    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
    _SPI.setDataMode(dataMode);
#endif

#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined (__arm__) && !defined(CORE_TEENSY)
    // Arduino Due in 1.5.5 has its own BitOrder :-(
    ::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();

#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_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_MBED) // MBed
	
	uint8_t dataMode;
	if (_dataMode == DataMode0)
		dataMode = 0;
	else if (_dataMode == DataMode1)
		dataMode = 1;
	else if (_dataMode == DataMode2)
		dataMode = 2;
	else if (_dataMode == DataMode3)
		dataMode = 3;
	printf("mode %d\n", dataMode);
	_SPI.format(8, dataMode);
	
	int frequency;
    switch (_frequency)
    {
		case Frequency1MHz:
		default:
		    frequency = 1000000;
		    break;
	
		case Frequency2MHz:
		    frequency = 2000000;
		    break;
	
		case Frequency4MHz:
		    frequency = 4000000;
		    break;
	
		case Frequency8MHz:
		    frequency = 8000000;
		    break;
	
		case Frequency16MHz:
		    frequency = 16000000;
		    break;
    }
    printf("@%dHz\n",frequency);
	_SPI.frequency(frequency);
#else
 #warning RHHardwareSPI does not support this platform yet. Consider adding it and contributing a patch.
#endif
}

void RHHardwareSPI::end() 
{
#if (RH_PLATFORM == RH_PLATFORM_MBED)
	// no end for SPI
#else
    return _SPI.end();
#endif
}

#endif