386 lines
11 KiB
C
386 lines
11 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC8xx/spi_lld.c
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* @brief LPC8xx low level SPI driver code.
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*
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* @addtogroup SPI
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_SPI || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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#if LPC8xx_SPI_USE_SPI0 || defined(__DOXYGEN__)
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/** @brief SPI1 driver identifier.*/
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SPIDriver SPID1;
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#endif
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#if LPC8xx_SPI_USE_SPI1 || defined(__DOXYGEN__)
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/** @brief SPI2 driver identifier.*/
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SPIDriver SPID2;
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#endif
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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static void spi_load_txdata(SPIDriver *spip) {
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LPC_SPI_TypeDef *spi = spip->spi;
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if (--spip->txcnt == 0) {
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spi->TXCTRL |= SPI_TXCTRL_EOT;
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}
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if (spip->txptr != NULL) {
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if ((spi->TXCTRL & SPI_TXCTRL_FLEN_MASK) > SPI_TXCTRL_FLEN(8)) {
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const uint16_t *p = spip->txptr;
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spi->TXDAT = *p++;
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spip->txptr = p;
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}
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else {
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const uint8_t *p = spip->txptr;
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spi->TXDAT = *p++;
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spip->txptr = p;
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}
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}
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else
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spi->TXDAT = 0xffff;
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}
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/**
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* @brief Common IRQ handler.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*/
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static void spi_serve_interrupt(SPIDriver *spip) {
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LPC_SPI_TypeDef *spi = spip->spi;
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if (spi->INTSTAT & (SPI_STAT_RXOV | SPI_STAT_TXUR)) {
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/* The overflow condition should never happen becausepriority is given
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to receive but a hook macro is provided anyway...*/
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LPC8xx_SPI_ERROR_HOOK(spip);
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spi->STAT = (SPI_STAT_RXOV | SPI_STAT_TXUR);
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}
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if (spi->INTSTAT & SPI_STAT_TXRDY) {
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spi_load_txdata( spip );
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}
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if (spip->txcnt == 0) {
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spi->INTENCLR = (SPI_STAT_TXRDY | SPI_STAT_TXUR);
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}
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if (spi->INTSTAT & SPI_STAT_RXRDY) {
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if (spip->rxptr != NULL) {
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if ((spi->TXCTRL & SPI_TXCTRL_FLEN_MASK) > SPI_TXCTRL_FLEN(8)) {
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uint16_t *p = spip->rxptr;
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*p++ = spi->RXDAT;
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spip->rxptr = p;
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}
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else {
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uint8_t *p = spip->rxptr;
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*p++ = spi->RXDAT;
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spip->rxptr = p;
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}
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}
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else
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(void)spi->RXDAT;
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if (--spip->rxcnt == 0) {
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chDbgAssert(spip->txcnt == 0,
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"spi_serve_interrupt(), #1", "counter out of synch");
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/* Stops the IRQ sources.*/
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spi->INTENCLR = (SPI_STAT_RXRDY | SPI_STAT_TXRDY |
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SPI_STAT_RXOV | SPI_STAT_TXUR);
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/* Portable SPI ISR code defined in the high level driver, note, it is
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a macro.*/
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_spi_isr_code(spip);
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return;
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}
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}
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if LPC8xx_SPI_USE_SPI0 || defined(__DOXYGEN__)
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/**
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* @brief SPI0 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector40) {
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CH_IRQ_PROLOGUE();
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spi_serve_interrupt(&SPID1);
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CH_IRQ_EPILOGUE();
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}
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#endif
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#if LPC8xx_SPI_USE_SPI1 || defined(__DOXYGEN__)
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/**
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* @brief SPI1 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector44) {
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CH_IRQ_PROLOGUE();
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spi_serve_interrupt(&SPID2);
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CH_IRQ_EPILOGUE();
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}
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#endif
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level SPI driver initialization.
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*
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* @notapi
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*/
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void spi_lld_init(void) {
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#if LPC8xx_SPI_USE_SPI0
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spiObjectInit(&SPID1);
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SPID1.spi = LPC_SPI0;
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#endif
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#if LPC8xx_SPI_USE_SPI1
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spiObjectInit(&SPID2);
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SPID2.spi = LPC_SPI1;
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#endif
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}
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/**
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* @brief Configures and activates the SPI peripheral.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_start(SPIDriver *spip) {
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if (spip->state == SPI_STOP) {
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#if LPC8xx_SPI_USE_SPI0
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if (&SPID1 == spip) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<11);
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LPC_SYSCON->PRESETCTRL |= (1<<0);
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spip->spi->DIV = LPC8xx_SPI_SPI0CLKDIV;
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nvicEnableVector(SPI0_IRQn,
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CORTEX_PRIORITY_MASK(LPC8xx_SPI_SPI0_IRQ_PRIORITY));
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}
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#endif
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#if LPC8xx_SPI_USE_SPI1
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if (&SPID2 == spip) {
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);
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LPC_SYSCON->PRESETCTRL |= (1<<1);
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spip->spi->DIV = LPC8xx_SPI_SPI1CLKDIV;
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nvicEnableVector(SPI1_IRQn,
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CORTEX_PRIORITY_MASK(LPC8xx_SPI_SPI1_IRQ_PRIORITY));
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}
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#endif
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}
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spip->spi->DLY = spip->config->dly;
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spip->spi->TXCTRL = spip->config->txctrl;
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spip->spi->STAT = (SPI_STAT_RXOV | SPI_STAT_TXUR);
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spip->spi->CFG = spip->config->cfg | SPI_CFG_ENABLE;
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}
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/**
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* @brief Deactivates the SPI peripheral.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_stop(SPIDriver *spip) {
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if (spip->state != SPI_STOP) {
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spip->spi->CFG = 0;
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#if LPC8xx_SPI_USE_SPI0
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if (&SPID1 == spip) {
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nvicDisableVector(SPI0_IRQn);
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LPC_SYSCON->PRESETCTRL &= ~(1<<0);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<11);
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}
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#endif
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#if LPC8xx_SPI_USE_SPI1
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if (&SPID2 == spip) {
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nvicDisableVector(SPI1_IRQn);
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LPC_SYSCON->PRESETCTRL &= ~(1<<1);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<12);
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}
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#endif
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}
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}
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/**
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* @brief Asserts the slave select signal and prepares for transfers.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_select(SPIDriver *spip) {
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/* Hardware controls SSEL */
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(void)spip;
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}
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/**
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* @brief Deasserts the slave select signal.
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* @details The previously selected peripheral is unselected.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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*
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* @notapi
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*/
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void spi_lld_unselect(SPIDriver *spip) {
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/* Hardware controls SSEL */
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(void)spip;
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}
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/**
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* @brief Exchanges data on the SPI bus.
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* @details This asynchronous function starts a simultaneous transmit/receive
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* operation.
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* @post At the end of the operation the configured callback is invoked.
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* @note The buffers are organized as uint8_t arrays for data sizes below or
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* equal to 8 bits else it is organized as uint16_t arrays.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to be exchanged
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* @param[in] txbuf the pointer to the transmit buffer
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* @param[out] rxbuf the pointer to the receive buffer
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*
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* @notapi
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*/
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void spi_lld_exchange(SPIDriver *spip, size_t n,
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const void *txbuf, void *rxbuf) {
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spip->rxptr = rxbuf;
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spip->txptr = txbuf;
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spip->rxcnt = spip->txcnt = n;
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spip->spi->TXCTRL &= ~SPI_TXCTRL_EOT;
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spi_load_txdata(spip);
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if (spip->txcnt == 0)
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spip->spi->INTENSET = (SPI_STAT_RXRDY | SPI_STAT_RXOV);
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else
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spip->spi->INTENSET = (SPI_STAT_RXRDY | SPI_STAT_TXRDY |
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SPI_STAT_RXOV | SPI_STAT_TXUR);
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}
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/**
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* @brief Ignores data on the SPI bus.
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* @details This function transmits a series of idle words on the SPI bus and
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* ignores the received data. This function can be invoked even
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* when a slave select signal has not been yet asserted.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to be ignored
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*
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* @notapi
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*/
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void spi_lld_ignore(SPIDriver *spip, size_t n) {
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spi_lld_exchange( spip, n, NULL, NULL);
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}
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/**
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* @brief Sends data over the SPI bus.
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* @details This asynchronous function starts a transmit operation.
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* @post At the end of the operation the configured callback is invoked.
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* @note The buffers are organized as uint8_t arrays for data sizes below or
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* equal to 8 bits else it is organized as uint16_t arrays.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to send
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* @param[in] txbuf the pointer to the transmit buffer
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*
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* @notapi
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*/
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void spi_lld_send(SPIDriver *spip, size_t n, const void *txbuf) {
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spi_lld_exchange( spip, n, txbuf, NULL);
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}
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/**
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* @brief Receives data from the SPI bus.
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* @details This asynchronous function starts a receive operation.
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* @post At the end of the operation the configured callback is invoked.
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* @note The buffers are organized as uint8_t arrays for data sizes below or
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* equal to 8 bits else it is organized as uint16_t arrays.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] n number of words to receive
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* @param[out] rxbuf the pointer to the receive buffer
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*
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* @notapi
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*/
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void spi_lld_receive(SPIDriver *spip, size_t n, void *rxbuf) {
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spi_lld_exchange( spip, n, NULL, rxbuf);
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}
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/**
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* @brief Exchanges one frame using a polled wait.
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* @details This synchronous function exchanges one frame using a polled
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* synchronization method. This function is useful when exchanging
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* small amount of data on high speed channels, usually in this
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* situation is much more efficient just wait for completion using
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* polling than suspending the thread waiting for an interrupt.
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*
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* @param[in] spip pointer to the @p SPIDriver object
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* @param[in] frame the data frame to send over the SPI bus
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* @return The received data frame from the SPI bus.
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*/
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uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
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spip->spi->TXCTRL |= SPI_TXCTRL_EOT;
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spip->spi->TXDAT = frame;
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while ((spip->spi->STAT & SPI_STAT_RXRDY) == 0)
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;
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return (uint16_t)spip->spi->RXDAT;
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||
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}
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||
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||
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#endif /* HAL_USE_SPI */
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||
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||
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/** @} */
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