413 lines
10 KiB
C++
413 lines
10 KiB
C++
// RHHardwareSPI.h
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// Author: Mike McCauley (mikem@airspayce.com)
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// Copyright (C) 2011 Mike McCauley
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// Contributed by Joanna Rutkowska
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// $Id: RHHardwareSPI.cpp,v 1.16 2016/07/07 00:02:53 mikem Exp mikem $
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#include <RHHardwareSPI.h>
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// Declare a single default instance of the hardware SPI interface class
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RHHardwareSPI hardware_spi;
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#ifdef RH_HAVE_HARDWARE_SPI
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#if (RH_PLATFORM == RH_PLATFORM_STM32) // Maple etc
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// Declare an SPI interface to use
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HardwareSPI SPI(1);
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#elif (RH_PLATFORM == RH_PLATFORM_STM32STD) // STM32F4 Discovery
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// Declare an SPI interface to use
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HardwareSPI SPI(1);
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#endif
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// Arduino Due has default SPI pins on central SPI headers, and not on 10, 11, 12, 13
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// as per other Arduinos
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// http://21stdigitalhome.blogspot.com.au/2013/02/arduino-due-hardware-spi.html
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#if defined (__arm__) && !defined(CORE_TEENSY) && !defined(SPI_CLOCK_DIV16)
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// Arduino Due in 1.5.5 has no definitions for SPI dividers
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// SPI clock divider is based on MCK of 84MHz
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#define SPI_CLOCK_DIV16 (VARIANT_MCK/84000000) // 1MHz
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#define SPI_CLOCK_DIV8 (VARIANT_MCK/42000000) // 2MHz
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#define SPI_CLOCK_DIV4 (VARIANT_MCK/21000000) // 4MHz
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#define SPI_CLOCK_DIV2 (VARIANT_MCK/10500000) // 8MHz
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#define SPI_CLOCK_DIV1 (VARIANT_MCK/5250000) // 16MHz
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#endif
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RHHardwareSPI::RHHardwareSPI(Frequency frequency, BitOrder bitOrder, DataMode dataMode)
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:
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RHGenericSPI(frequency, bitOrder, dataMode)
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{
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}
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uint8_t RHHardwareSPI::transfer(uint8_t data)
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{
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return SPI.transfer(data);
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}
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void RHHardwareSPI::attachInterrupt()
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{
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO)
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SPI.attachInterrupt();
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#endif
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}
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void RHHardwareSPI::detachInterrupt()
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{
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO)
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SPI.detachInterrupt();
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#endif
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}
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void RHHardwareSPI::begin()
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{
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// Sigh: there are no common symbols for some of these SPI options across all platforms
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) || (RH_PLATFORM == RH_PLATFORM_UNO32) || (RH_PLATFORM == RH_PLATFORM_CHIPKIT_CORE)
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uint8_t dataMode;
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if (_dataMode == DataMode0)
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dataMode = SPI_MODE0;
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else if (_dataMode == DataMode1)
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dataMode = SPI_MODE1;
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else if (_dataMode == DataMode2)
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dataMode = SPI_MODE2;
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else if (_dataMode == DataMode3)
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dataMode = SPI_MODE3;
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else
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dataMode = SPI_MODE0;
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined(__arm__) && defined(CORE_TEENSY)
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// Temporary work-around due to problem where avr_emulation.h does not work properly for the setDataMode() cal
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SPCR &= ~SPI_MODE_MASK;
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#else
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined (__arm__) && defined(ARDUINO_ARCH_SAMD)
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// Zero requires begin() before anything else :-)
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SPI.begin();
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#endif
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SPI.setDataMode(dataMode);
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#endif
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined(SPI_HAS_TRANSACTION)
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uint32_t frequency32;
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if (_frequency == Frequency16MHz) {
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frequency32 = 16000000;
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} else if (_frequency == Frequency8MHz) {
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frequency32 = 8000000;
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} else if (_frequency == Frequency4MHz) {
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frequency32 = 4000000;
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} else if (_frequency == Frequency2MHz) {
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frequency32 = 2000000;
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} else {
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frequency32 = 1000000;
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}
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_settings = SPISettings(frequency32,
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(_bitOrder == BitOrderLSBFirst) ? LSBFIRST : MSBFIRST,
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dataMode);
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//Serial.print("SPISettings: "); Serial.println(frequency32, DEC);
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#endif
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined (__arm__) && (defined(ARDUINO_SAM_DUE) || defined(ARDUINO_ARCH_SAMD))
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// Arduino Due in 1.5.5 has its own BitOrder :-(
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// So too does Arduino Zero
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::BitOrder bitOrder;
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#else
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uint8_t bitOrder;
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#endif
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if (_bitOrder == BitOrderLSBFirst)
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bitOrder = LSBFIRST;
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else
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bitOrder = MSBFIRST;
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SPI.setBitOrder(bitOrder);
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uint8_t divider;
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switch (_frequency)
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{
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case Frequency1MHz:
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default:
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#if F_CPU == 8000000
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divider = SPI_CLOCK_DIV8;
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#else
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divider = SPI_CLOCK_DIV16;
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#endif
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break;
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case Frequency2MHz:
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#if F_CPU == 8000000
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divider = SPI_CLOCK_DIV4;
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#else
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divider = SPI_CLOCK_DIV8;
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#endif
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break;
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case Frequency4MHz:
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#if F_CPU == 8000000
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divider = SPI_CLOCK_DIV2;
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#else
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divider = SPI_CLOCK_DIV4;
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#endif
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break;
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case Frequency8MHz:
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divider = SPI_CLOCK_DIV2; // 4MHz on an 8MHz Arduino
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break;
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case Frequency16MHz:
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divider = SPI_CLOCK_DIV2; // Not really 16MHz, only 8MHz. 4MHz on an 8MHz Arduino
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break;
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}
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SPI.setClockDivider(divider);
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SPI.begin();
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// Teensy requires it to be set _after_ begin()
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SPI.setClockDivider(divider);
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#elif (RH_PLATFORM == RH_PLATFORM_STM32) // Maple etc
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spi_mode dataMode;
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// Hmmm, if we do this as a switch, GCC on maple gets v confused!
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if (_dataMode == DataMode0)
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dataMode = SPI_MODE_0;
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else if (_dataMode == DataMode1)
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dataMode = SPI_MODE_1;
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else if (_dataMode == DataMode2)
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dataMode = SPI_MODE_2;
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else if (_dataMode == DataMode3)
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dataMode = SPI_MODE_3;
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else
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dataMode = SPI_MODE_0;
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uint32 bitOrder;
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if (_bitOrder == BitOrderLSBFirst)
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bitOrder = LSBFIRST;
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else
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bitOrder = MSBFIRST;
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SPIFrequency frequency; // Yes, I know these are not exact equivalents.
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switch (_frequency)
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{
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case Frequency1MHz:
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default:
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frequency = SPI_1_125MHZ;
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break;
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case Frequency2MHz:
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frequency = SPI_2_25MHZ;
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break;
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case Frequency4MHz:
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frequency = SPI_4_5MHZ;
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break;
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case Frequency8MHz:
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frequency = SPI_9MHZ;
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break;
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case Frequency16MHz:
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frequency = SPI_18MHZ;
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break;
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}
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SPI.begin(frequency, bitOrder, dataMode);
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#elif (RH_PLATFORM == RH_PLATFORM_STM32STD) // STM32F4 discovery
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uint8_t dataMode;
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if (_dataMode == DataMode0)
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dataMode = SPI_MODE0;
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else if (_dataMode == DataMode1)
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dataMode = SPI_MODE1;
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else if (_dataMode == DataMode2)
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dataMode = SPI_MODE2;
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else if (_dataMode == DataMode3)
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dataMode = SPI_MODE3;
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else
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dataMode = SPI_MODE0;
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uint32_t bitOrder;
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if (_bitOrder == BitOrderLSBFirst)
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bitOrder = LSBFIRST;
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else
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bitOrder = MSBFIRST;
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SPIFrequency frequency; // Yes, I know these are not exact equivalents.
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switch (_frequency)
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{
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case Frequency1MHz:
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default:
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frequency = SPI_1_3125MHZ;
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break;
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case Frequency2MHz:
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frequency = SPI_2_625MHZ;
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break;
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case Frequency4MHz:
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frequency = SPI_5_25MHZ;
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break;
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case Frequency8MHz:
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frequency = SPI_10_5MHZ;
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break;
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case Frequency16MHz:
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frequency = SPI_21_0MHZ;
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break;
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}
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SPI.begin(frequency, bitOrder, dataMode);
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#elif (RH_PLATFORM == RH_PLATFORM_STM32F2) // Photon
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Serial.println("HERE");
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uint8_t dataMode;
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if (_dataMode == DataMode0)
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dataMode = SPI_MODE0;
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else if (_dataMode == DataMode1)
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dataMode = SPI_MODE1;
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else if (_dataMode == DataMode2)
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dataMode = SPI_MODE2;
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else if (_dataMode == DataMode3)
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dataMode = SPI_MODE3;
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else
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dataMode = SPI_MODE0;
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SPI.setDataMode(dataMode);
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if (_bitOrder == BitOrderLSBFirst)
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SPI.setBitOrder(LSBFIRST);
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else
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SPI.setBitOrder(MSBFIRST);
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switch (_frequency)
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{
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case Frequency1MHz:
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default:
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SPI.setClockSpeed(1, MHZ);
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break;
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case Frequency2MHz:
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SPI.setClockSpeed(2, MHZ);
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break;
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case Frequency4MHz:
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SPI.setClockSpeed(4, MHZ);
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break;
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case Frequency8MHz:
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SPI.setClockSpeed(8, MHZ);
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break;
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case Frequency16MHz:
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SPI.setClockSpeed(16, MHZ);
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break;
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}
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// SPI.setClockDivider(SPI_CLOCK_DIV4); // 72MHz / 4MHz = 18MHz
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// SPI.setClockSpeed(1, MHZ);
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SPI.begin();
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#elif (RH_PLATFORM == RH_PLATFORM_ESP8266)
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// Requires SPI driver for ESP8266 from https://github.com/esp8266/Arduino/tree/master/libraries/SPI
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// Which ppears to be in Arduino Board Manager ESP8266 Community version 2.1.0
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// Contributed by David Skinner
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// begin comes first
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SPI.begin();
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// datamode
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switch ( _dataMode )
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{
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case DataMode1:
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SPI.setDataMode ( SPI_MODE1 );
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break;
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case DataMode2:
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SPI.setDataMode ( SPI_MODE2 );
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break;
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case DataMode3:
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SPI.setDataMode ( SPI_MODE3 );
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break;
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case DataMode0:
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default:
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SPI.setDataMode ( SPI_MODE0 );
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break;
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}
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// bitorder
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SPI.setBitOrder(_bitOrder == BitOrderLSBFirst ? LSBFIRST : MSBFIRST);
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// frequency (this sets the divider)
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switch (_frequency)
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{
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case Frequency1MHz:
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default:
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SPI.setFrequency(1000000);
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break;
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case Frequency2MHz:
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SPI.setFrequency(2000000);
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break;
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case Frequency4MHz:
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SPI.setFrequency(4000000);
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break;
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case Frequency8MHz:
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SPI.setFrequency(8000000);
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break;
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case Frequency16MHz:
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SPI.setFrequency(16000000);
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break;
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}
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#elif (RH_PLATFORM == RH_PLATFORM_RASPI) // Raspberry PI
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uint8_t dataMode;
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if (_dataMode == DataMode0)
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dataMode = BCM2835_SPI_MODE0;
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else if (_dataMode == DataMode1)
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dataMode = BCM2835_SPI_MODE1;
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else if (_dataMode == DataMode2)
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dataMode = BCM2835_SPI_MODE2;
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else if (_dataMode == DataMode3)
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dataMode = BCM2835_SPI_MODE3;
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uint8_t bitOrder;
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if (_bitOrder == BitOrderLSBFirst)
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bitOrder = BCM2835_SPI_BIT_ORDER_LSBFIRST;
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else
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bitOrder = BCM2835_SPI_BIT_ORDER_MSBFIRST;
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uint32_t divider;
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switch (_frequency)
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{
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case Frequency1MHz:
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default:
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divider = BCM2835_SPI_CLOCK_DIVIDER_256;
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break;
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case Frequency2MHz:
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divider = BCM2835_SPI_CLOCK_DIVIDER_128;
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break;
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case Frequency4MHz:
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divider = BCM2835_SPI_CLOCK_DIVIDER_64;
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break;
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case Frequency8MHz:
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divider = BCM2835_SPI_CLOCK_DIVIDER_32;
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break;
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case Frequency16MHz:
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divider = BCM2835_SPI_CLOCK_DIVIDER_16;
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break;
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}
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SPI.begin(divider, bitOrder, dataMode);
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#else
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#warning RHHardwareSPI does not support this platform yet. Consider adding it and contributing a patch.
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#endif
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}
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void RHHardwareSPI::end()
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{
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return SPI.end();
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}
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// If our platform is arduino and we support transactions then lets use the begin/end transaction
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#if (RH_PLATFORM == RH_PLATFORM_ARDUINO) && defined(SPI_HAS_TRANSACTION)
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void RHHardwareSPI::beginTransaction()
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{
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SPI.beginTransaction(_settings);
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}
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void RHHardwareSPI::endTransaction()
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{
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SPI.endTransaction();
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}
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#endif
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#endif
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