509 lines
14 KiB
C++
509 lines
14 KiB
C++
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#include "Adafruit_SPIDevice.h"
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//#define DEBUG_SERIAL Serial
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/*!
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* @brief Create an SPI device with the given CS pin and settings
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* @param cspin The arduino pin number to use for chip select
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* @param freq The SPI clock frequency to use, defaults to 1MHz
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* @param dataOrder The SPI data order to use for bits within each byte,
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* defaults to SPI_BITORDER_MSBFIRST
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* @param dataMode The SPI mode to use, defaults to SPI_MODE0
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* @param theSPI The SPI bus to use, defaults to &theSPI
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*/
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Adafruit_SPIDevice::Adafruit_SPIDevice(int8_t cspin, uint32_t freq,
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BusIOBitOrder dataOrder,
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uint8_t dataMode, SPIClass *theSPI) {
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#ifdef BUSIO_HAS_HW_SPI
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_cs = cspin;
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_sck = _mosi = _miso = -1;
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_spi = theSPI;
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_begun = false;
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_spiSetting = new SPISettings(freq, dataOrder, dataMode);
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_freq = freq;
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_dataOrder = dataOrder;
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_dataMode = dataMode;
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#else
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// unused, but needed to suppress compiler warns
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(void)cspin;
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(void)freq;
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(void)dataOrder;
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(void)dataMode;
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(void)theSPI;
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#endif
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}
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/*!
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* @brief Create an SPI device with the given CS pin and settings
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* @param cspin The arduino pin number to use for chip select
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* @param sckpin The arduino pin number to use for SCK
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* @param misopin The arduino pin number to use for MISO, set to -1 if not
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* used
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* @param mosipin The arduino pin number to use for MOSI, set to -1 if not
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* used
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* @param freq The SPI clock frequency to use, defaults to 1MHz
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* @param dataOrder The SPI data order to use for bits within each byte,
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* defaults to SPI_BITORDER_MSBFIRST
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* @param dataMode The SPI mode to use, defaults to SPI_MODE0
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*/
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Adafruit_SPIDevice::Adafruit_SPIDevice(int8_t cspin, int8_t sckpin,
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int8_t misopin, int8_t mosipin,
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uint32_t freq, BusIOBitOrder dataOrder,
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uint8_t dataMode) {
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_cs = cspin;
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_sck = sckpin;
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_miso = misopin;
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_mosi = mosipin;
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#ifdef BUSIO_USE_FAST_PINIO
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csPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(cspin));
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csPinMask = digitalPinToBitMask(cspin);
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if (mosipin != -1) {
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mosiPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(mosipin));
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mosiPinMask = digitalPinToBitMask(mosipin);
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}
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if (misopin != -1) {
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misoPort = (BusIO_PortReg *)portInputRegister(digitalPinToPort(misopin));
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misoPinMask = digitalPinToBitMask(misopin);
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}
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clkPort = (BusIO_PortReg *)portOutputRegister(digitalPinToPort(sckpin));
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clkPinMask = digitalPinToBitMask(sckpin);
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#endif
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_freq = freq;
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_dataOrder = dataOrder;
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_dataMode = dataMode;
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_begun = false;
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}
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/*!
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* @brief Release memory allocated in constructors
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*/
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Adafruit_SPIDevice::~Adafruit_SPIDevice() {
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if (_spiSetting)
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delete _spiSetting;
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}
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/*!
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* @brief Initializes SPI bus and sets CS pin high
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* @return Always returns true because there's no way to test success of SPI
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* init
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*/
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bool Adafruit_SPIDevice::begin(void) {
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if (_cs != -1) {
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pinMode(_cs, OUTPUT);
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digitalWrite(_cs, HIGH);
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}
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if (_spi) { // hardware SPI
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#ifdef BUSIO_HAS_HW_SPI
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_spi->begin();
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#endif
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} else {
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pinMode(_sck, OUTPUT);
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if ((_dataMode == SPI_MODE0) || (_dataMode == SPI_MODE1)) {
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// idle low on mode 0 and 1
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digitalWrite(_sck, LOW);
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} else {
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// idle high on mode 2 or 3
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digitalWrite(_sck, HIGH);
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}
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if (_mosi != -1) {
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pinMode(_mosi, OUTPUT);
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digitalWrite(_mosi, HIGH);
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}
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if (_miso != -1) {
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pinMode(_miso, INPUT);
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}
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}
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_begun = true;
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return true;
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}
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/*!
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* @brief Transfer (send/receive) a buffer over hard/soft SPI, without
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* transaction management
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* @param buffer The buffer to send and receive at the same time
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* @param len The number of bytes to transfer
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*/
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void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
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//
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// HARDWARE SPI
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//
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if (_spi) {
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#ifdef BUSIO_HAS_HW_SPI
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#if defined(SPARK)
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_spi->transfer(buffer, buffer, len, nullptr);
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#elif defined(STM32)
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for (size_t i = 0; i < len; i++) {
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_spi->transfer(buffer[i]);
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}
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#else
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_spi->transfer(buffer, len);
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#endif
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return;
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#endif
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}
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//
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// SOFTWARE SPI
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//
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uint8_t startbit;
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if (_dataOrder == SPI_BITORDER_LSBFIRST) {
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startbit = 0x1;
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} else {
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startbit = 0x80;
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}
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bool towrite, lastmosi = !(buffer[0] & startbit);
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uint8_t bitdelay_us = (1000000 / _freq) / 2;
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for (size_t i = 0; i < len; i++) {
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uint8_t reply = 0;
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uint8_t send = buffer[i];
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/*
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Serial.print("\tSending software SPI byte 0x");
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Serial.print(send, HEX);
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Serial.print(" -> 0x");
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*/
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// Serial.print(send, HEX);
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for (uint8_t b = startbit; b != 0;
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b = (_dataOrder == SPI_BITORDER_LSBFIRST) ? b << 1 : b >> 1) {
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if (bitdelay_us) {
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delayMicroseconds(bitdelay_us);
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}
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if (_dataMode == SPI_MODE0 || _dataMode == SPI_MODE2) {
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towrite = send & b;
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if ((_mosi != -1) && (lastmosi != towrite)) {
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#ifdef BUSIO_USE_FAST_PINIO
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if (towrite)
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*mosiPort = *mosiPort | mosiPinMask;
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else
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*mosiPort = *mosiPort & ~mosiPinMask;
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#else
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digitalWrite(_mosi, towrite);
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#endif
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lastmosi = towrite;
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}
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#ifdef BUSIO_USE_FAST_PINIO
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*clkPort = *clkPort | clkPinMask; // Clock high
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#else
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digitalWrite(_sck, HIGH);
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#endif
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if (bitdelay_us) {
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delayMicroseconds(bitdelay_us);
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}
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if (_miso != -1) {
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#ifdef BUSIO_USE_FAST_PINIO
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if (*misoPort & misoPinMask) {
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#else
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if (digitalRead(_miso)) {
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#endif
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reply |= b;
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}
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}
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#ifdef BUSIO_USE_FAST_PINIO
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*clkPort = *clkPort & ~clkPinMask; // Clock low
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#else
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digitalWrite(_sck, LOW);
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#endif
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} else { // if (_dataMode == SPI_MODE1 || _dataMode == SPI_MODE3)
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#ifdef BUSIO_USE_FAST_PINIO
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*clkPort = *clkPort | clkPinMask; // Clock high
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#else
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digitalWrite(_sck, HIGH);
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#endif
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if (bitdelay_us) {
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delayMicroseconds(bitdelay_us);
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}
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if (_mosi != -1) {
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#ifdef BUSIO_USE_FAST_PINIO
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if (send & b)
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*mosiPort = *mosiPort | mosiPinMask;
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else
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*mosiPort = *mosiPort & ~mosiPinMask;
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#else
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digitalWrite(_mosi, send & b);
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#endif
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}
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#ifdef BUSIO_USE_FAST_PINIO
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*clkPort = *clkPort & ~clkPinMask; // Clock low
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#else
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digitalWrite(_sck, LOW);
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#endif
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if (_miso != -1) {
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#ifdef BUSIO_USE_FAST_PINIO
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if (*misoPort & misoPinMask) {
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#else
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if (digitalRead(_miso)) {
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#endif
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reply |= b;
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}
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}
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}
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if (_miso != -1) {
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buffer[i] = reply;
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}
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}
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}
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return;
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}
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/*!
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* @brief Transfer (send/receive) one byte over hard/soft SPI, without
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* transaction management
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* @param send The byte to send
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* @return The byte received while transmitting
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*/
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uint8_t Adafruit_SPIDevice::transfer(uint8_t send) {
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uint8_t data = send;
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transfer(&data, 1);
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return data;
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}
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/*!
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* @brief Manually begin a transaction (calls beginTransaction if hardware
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* SPI)
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*/
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void Adafruit_SPIDevice::beginTransaction(void) {
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if (_spi) {
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#ifdef BUSIO_HAS_HW_SPI
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_spi->beginTransaction(*_spiSetting);
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#endif
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}
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}
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/*!
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* @brief Manually end a transaction (calls endTransaction if hardware SPI)
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*/
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void Adafruit_SPIDevice::endTransaction(void) {
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if (_spi) {
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#ifdef BUSIO_HAS_HW_SPI
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_spi->endTransaction();
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#endif
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}
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}
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/*!
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* @brief Assert/Deassert the CS pin if it is defined
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* @param value The state the CS is set to
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*/
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void Adafruit_SPIDevice::setChipSelect(int value) {
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if (_cs != -1) {
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digitalWrite(_cs, value);
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}
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}
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/*!
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* @brief Write a buffer or two to the SPI device, with transaction
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* management.
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* @brief Manually begin a transaction (calls beginTransaction if hardware
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* SPI) with asserting the CS pin
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*/
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void Adafruit_SPIDevice::beginTransactionWithAssertingCS() {
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beginTransaction();
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setChipSelect(LOW);
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}
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/*!
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* @brief Manually end a transaction (calls endTransaction if hardware SPI)
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* with deasserting the CS pin
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*/
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void Adafruit_SPIDevice::endTransactionWithDeassertingCS() {
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setChipSelect(HIGH);
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endTransaction();
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}
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/*!
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* @brief Write a buffer or two to the SPI device, with transaction
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* management.
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* @param buffer Pointer to buffer of data to write
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* @param len Number of bytes from buffer to write
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* @param prefix_buffer Pointer to optional array of data to write before
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* buffer.
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* @param prefix_len Number of bytes from prefix buffer to write
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* @return Always returns true because there's no way to test success of SPI
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* writes
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*/
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bool Adafruit_SPIDevice::write(const uint8_t *buffer, size_t len,
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const uint8_t *prefix_buffer,
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size_t prefix_len) {
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beginTransactionWithAssertingCS();
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// do the writing
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#if defined(ARDUINO_ARCH_ESP32)
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if (_spi) {
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if (prefix_len > 0) {
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_spi->transferBytes((uint8_t *)prefix_buffer, nullptr, prefix_len);
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}
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if (len > 0) {
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_spi->transferBytes((uint8_t *)buffer, nullptr, len);
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}
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} else
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#endif
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{
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for (size_t i = 0; i < prefix_len; i++) {
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transfer(prefix_buffer[i]);
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}
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for (size_t i = 0; i < len; i++) {
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transfer(buffer[i]);
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}
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}
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endTransactionWithDeassertingCS();
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#ifdef DEBUG_SERIAL
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DEBUG_SERIAL.print(F("\tSPIDevice Wrote: "));
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if ((prefix_len != 0) && (prefix_buffer != nullptr)) {
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for (uint16_t i = 0; i < prefix_len; i++) {
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DEBUG_SERIAL.print(F("0x"));
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DEBUG_SERIAL.print(prefix_buffer[i], HEX);
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DEBUG_SERIAL.print(F(", "));
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}
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}
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for (uint16_t i = 0; i < len; i++) {
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DEBUG_SERIAL.print(F("0x"));
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DEBUG_SERIAL.print(buffer[i], HEX);
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DEBUG_SERIAL.print(F(", "));
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if (i % 32 == 31) {
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DEBUG_SERIAL.println();
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}
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}
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DEBUG_SERIAL.println();
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#endif
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|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* @brief Read from SPI into a buffer from the SPI device, with transaction
|
||
|
|
* management.
|
||
|
|
* @param buffer Pointer to buffer of data to read into
|
||
|
|
* @param len Number of bytes from buffer to read.
|
||
|
|
* @param sendvalue The 8-bits of data to write when doing the data read,
|
||
|
|
* defaults to 0xFF
|
||
|
|
* @return Always returns true because there's no way to test success of SPI
|
||
|
|
* writes
|
||
|
|
*/
|
||
|
|
bool Adafruit_SPIDevice::read(uint8_t *buffer, size_t len, uint8_t sendvalue) {
|
||
|
|
memset(buffer, sendvalue, len); // clear out existing buffer
|
||
|
|
|
||
|
|
beginTransactionWithAssertingCS();
|
||
|
|
transfer(buffer, len);
|
||
|
|
endTransactionWithDeassertingCS();
|
||
|
|
|
||
|
|
#ifdef DEBUG_SERIAL
|
||
|
|
DEBUG_SERIAL.print(F("\tSPIDevice Read: "));
|
||
|
|
for (uint16_t i = 0; i < len; i++) {
|
||
|
|
DEBUG_SERIAL.print(F("0x"));
|
||
|
|
DEBUG_SERIAL.print(buffer[i], HEX);
|
||
|
|
DEBUG_SERIAL.print(F(", "));
|
||
|
|
if (len % 32 == 31) {
|
||
|
|
DEBUG_SERIAL.println();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
DEBUG_SERIAL.println();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* @brief Write some data, then read some data from SPI into another buffer,
|
||
|
|
* with transaction management. The buffers can point to same/overlapping
|
||
|
|
* locations. This does not transmit-receive at the same time!
|
||
|
|
* @param write_buffer Pointer to buffer of data to write from
|
||
|
|
* @param write_len Number of bytes from buffer to write.
|
||
|
|
* @param read_buffer Pointer to buffer of data to read into.
|
||
|
|
* @param read_len Number of bytes from buffer to read.
|
||
|
|
* @param sendvalue The 8-bits of data to write when doing the data read,
|
||
|
|
* defaults to 0xFF
|
||
|
|
* @return Always returns true because there's no way to test success of SPI
|
||
|
|
* writes
|
||
|
|
*/
|
||
|
|
bool Adafruit_SPIDevice::write_then_read(const uint8_t *write_buffer,
|
||
|
|
size_t write_len, uint8_t *read_buffer,
|
||
|
|
size_t read_len, uint8_t sendvalue) {
|
||
|
|
beginTransactionWithAssertingCS();
|
||
|
|
// do the writing
|
||
|
|
#if defined(ARDUINO_ARCH_ESP32)
|
||
|
|
if (_spi) {
|
||
|
|
if (write_len > 0) {
|
||
|
|
_spi->transferBytes((uint8_t *)write_buffer, nullptr, write_len);
|
||
|
|
}
|
||
|
|
} else
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
for (size_t i = 0; i < write_len; i++) {
|
||
|
|
transfer(write_buffer[i]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG_SERIAL
|
||
|
|
DEBUG_SERIAL.print(F("\tSPIDevice Wrote: "));
|
||
|
|
for (uint16_t i = 0; i < write_len; i++) {
|
||
|
|
DEBUG_SERIAL.print(F("0x"));
|
||
|
|
DEBUG_SERIAL.print(write_buffer[i], HEX);
|
||
|
|
DEBUG_SERIAL.print(F(", "));
|
||
|
|
if (write_len % 32 == 31) {
|
||
|
|
DEBUG_SERIAL.println();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
DEBUG_SERIAL.println();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// do the reading
|
||
|
|
for (size_t i = 0; i < read_len; i++) {
|
||
|
|
read_buffer[i] = transfer(sendvalue);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef DEBUG_SERIAL
|
||
|
|
DEBUG_SERIAL.print(F("\tSPIDevice Read: "));
|
||
|
|
for (uint16_t i = 0; i < read_len; i++) {
|
||
|
|
DEBUG_SERIAL.print(F("0x"));
|
||
|
|
DEBUG_SERIAL.print(read_buffer[i], HEX);
|
||
|
|
DEBUG_SERIAL.print(F(", "));
|
||
|
|
if (read_len % 32 == 31) {
|
||
|
|
DEBUG_SERIAL.println();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
DEBUG_SERIAL.println();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
endTransactionWithDeassertingCS();
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* @brief Write some data and read some data at the same time from SPI
|
||
|
|
* into the same buffer, with transaction management. This is basicaly a wrapper
|
||
|
|
* for transfer() with CS-pin and transaction management. This /does/
|
||
|
|
* transmit-receive at the same time!
|
||
|
|
* @param buffer Pointer to buffer of data to write/read to/from
|
||
|
|
* @param len Number of bytes from buffer to write/read.
|
||
|
|
* @return Always returns true because there's no way to test success of SPI
|
||
|
|
* writes
|
||
|
|
*/
|
||
|
|
bool Adafruit_SPIDevice::write_and_read(uint8_t *buffer, size_t len) {
|
||
|
|
beginTransactionWithAssertingCS();
|
||
|
|
transfer(buffer, len);
|
||
|
|
endTransactionWithDeassertingCS();
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|