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129 lines
3.3 KiB
C++
129 lines
3.3 KiB
C++
/*
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* Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
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* SPI Master library for arduino.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either the GNU General Public License version 2
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* or the GNU Lesser General Public License version 2.1, both as
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* published by the Free Software Foundation.
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*/
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#include "SPI.h"
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SPIClass::SPIClass(Spi *_spi, uint32_t _id, void(*_initCb)(void), uint32_t *_ss) :
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spi(_spi), id(_id), initCb(_initCb)
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{
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for (int i=0; i<SPI_CHANNELS_NUM; i++)
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ssPins[i] = _ss[i];
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}
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void SPIClass::begin() {
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initCb();
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// Set CS on NPCS3
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SPI_Configure(spi, id, SPI_MR_MSTR | SPI_MR_PS);
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SPI_Enable(spi);
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setClockDivider(1);
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setDataMode(0);
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}
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void SPIClass::addSlave(uint8_t _channel) {
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uint32_t pin = ssPins[_channel];
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if (pin == 0)
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return;
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PIO_Configure(g_APinDescription[pin].pPort,
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g_APinDescription[pin].ulPinType,
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g_APinDescription[pin].ulPin,
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g_APinDescription[pin].ulPinConfiguration);
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}
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void SPIClass::end() {
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SPI_Disable(spi);
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}
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void SPIClass::setBitOrder(uint8_t bitOrder) {
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setBitOrder(bitOrder, 0);
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setBitOrder(bitOrder, 1);
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setBitOrder(bitOrder, 2);
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setBitOrder(bitOrder, 3);
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}
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void SPIClass::setBitOrder(uint8_t bitOrder, uint8_t _channel) {
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// Not supported
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}
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void SPIClass::setDataMode(uint8_t _mode) {
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setDataMode(_mode, 0);
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setDataMode(_mode, 1);
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setDataMode(_mode, 2);
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setDataMode(_mode, 3);
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}
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void SPIClass::setDataMode(uint8_t _mode, uint8_t _channel) {
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mode[_channel] = _mode | SPI_CSR_CSAAT;
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SPI_ConfigureNPCS(spi, _channel, mode[_channel] | SPI_CSR_SCBR(divider[_channel]));
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}
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void SPIClass::setClockDivider(uint8_t _divider) {
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setClockDivider(_divider, 0);
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setClockDivider(_divider, 1);
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setClockDivider(_divider, 2);
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setClockDivider(_divider, 3);
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}
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void SPIClass::setClockDivider(uint8_t _divider, uint8_t _channel) {
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divider[_channel] = _divider;
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SPI_ConfigureNPCS(spi, _channel, mode[_channel] | SPI_CSR_SCBR(divider[_channel]));
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}
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byte SPIClass::transfer(byte _data, uint8_t _channel, bool _last) {
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uint32_t d = _data | SPI_PCS(_channel);
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if (_last)
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d |= SPI_TDR_LASTXFER;
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// SPI_Write(spi, _channel, _data);
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while ((spi->SPI_SR & SPI_SR_TDRE) == 0)
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;
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spi->SPI_TDR = d;
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// return SPI_Read(spi);
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while ((spi->SPI_SR & SPI_SR_RDRF) == 0)
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;
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d = spi->SPI_RDR;
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return d & 0xFF;
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}
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void SPIClass::attachInterrupt(void) {
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// Should be enableInterrupt()
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}
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void SPIClass::detachInterrupt(void) {
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// Should be disableInterrupt()
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}
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#if SPI_INTERFACES_COUNT > 0
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static void SPI_0_Init(void) {
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PIO_Configure(g_APinDescription[PIN_SPI_MOSI].pPort,
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g_APinDescription[PIN_SPI_MOSI].ulPinType,
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g_APinDescription[PIN_SPI_MOSI].ulPin,
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g_APinDescription[PIN_SPI_MOSI].ulPinConfiguration);
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PIO_Configure(g_APinDescription[PIN_SPI_MISO].pPort,
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g_APinDescription[PIN_SPI_MISO].ulPinType,
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g_APinDescription[PIN_SPI_MISO].ulPin,
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g_APinDescription[PIN_SPI_MISO].ulPinConfiguration);
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PIO_Configure(g_APinDescription[PIN_SPI_SCK].pPort,
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g_APinDescription[PIN_SPI_SCK].ulPinType,
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g_APinDescription[PIN_SPI_SCK].ulPin,
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g_APinDescription[PIN_SPI_SCK].ulPinConfiguration);
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}
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uint32_t SPI_0_SS[] = {
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PIN_SPI_SS0,
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PIN_SPI_SS1,
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PIN_SPI_SS2,
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PIN_SPI_SS3
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};
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SPIClass SPI_0(SPI_INTERFACE, SPI_INTERFACE_ID, SPI_0_Init, SPI_0_SS);
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#endif
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