396 lines
11 KiB
C
396 lines
11 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file LPC11Uxx/spi_lld.c
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* @brief LPC11Uxx 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 LPC_SPI_USE_SSP0 || 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 LPC_SPI_USE_SSP1 || 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. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Preloads the transmit FIFO.
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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 ssp_fifo_preload(SPIDriver *spip) {
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LPC_SSPx_Type *ssp = spip->ssp;
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uint32_t n = spip->txcnt > LPC_SSP_FIFO_DEPTH ?
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LPC_SSP_FIFO_DEPTH : spip->txcnt;
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while(((ssp->SR & SR_TNF) != 0) && (n > 0)) {
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if (spip->txptr != NULL) {
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if ((ssp->CR0 & CR0_DSSMASK) > CR0_DSS8BIT) {
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const uint16_t *p = spip->txptr;
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ssp->DR = *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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ssp->DR = *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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ssp->DR = 0xFFFFFFFF;
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n--;
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spip->txcnt--;
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}
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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_SSPx_Type *ssp = spip->ssp;
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if ((ssp->MIS & MIS_ROR) != 0) {
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/* The overflow condition should never happen because priority is given
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to receive but a hook macro is provided anyway...*/
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LPC_SPI_SSP_ERROR_HOOK(spip);
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}
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ssp->ICR = ICR_RT | ICR_ROR;
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while ((ssp->SR & SR_RNE) != 0) {
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if (spip->rxptr != NULL) {
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if ((ssp->CR0 & CR0_DSSMASK) > CR0_DSS8BIT) {
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uint16_t *p = spip->rxptr;
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*p++ = ssp->DR;
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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++ = ssp->DR;
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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)ssp->DR;
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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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ssp->IMSC = 0;
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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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ssp_fifo_preload(spip);
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if (spip->txcnt == 0)
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ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_RX;
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if LPC_SPI_USE_SSP0 || defined(__DOXYGEN__)
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/**
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* @brief SSP0 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector90) {
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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 LPC_SPI_USE_SSP1 || defined(__DOXYGEN__)
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/**
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* @brief SSP1 interrupt handler.
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*
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* @isr
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*/
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CH_IRQ_HANDLER(Vector78) {
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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 LPC_SPI_USE_SSP0
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spiObjectInit(&SPID1);
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SPID1.ssp = LPC_SSP0;
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#endif /* LPC_SPI_USE_SSP0 */
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#if LPC_SPI_USE_SSP1
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spiObjectInit(&SPID2);
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SPID2.ssp = LPC_SSP1;
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#endif /* LPC_SPI_USE_SSP0 */
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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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/* Clock activation.*/
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#if LPC_SPI_USE_SSP0
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if (&SPID1 == spip) {
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LPC_SYSCON->SSP0CLKDIV = LPC_SPI_SSP0CLKDIV;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 11);
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LPC_SYSCON->PRESETCTRL |= 1;
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nvicEnableVector(SSP0_IRQn,
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CORTEX_PRIORITY_MASK(LPC_SPI_SSP0_IRQ_PRIORITY));
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}
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#endif
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#if LPC_SPI_USE_SSP1
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if (&SPID2 == spip) {
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LPC_SYSCON->SSP1CLKDIV = LPC_SPI_SSP1CLKDIV;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 18);
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LPC_SYSCON->PRESETCTRL |= 4;
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nvicEnableVector(SSP1_IRQn,
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CORTEX_PRIORITY_MASK(LPC_SPI_SSP1_IRQ_PRIORITY));
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}
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#endif
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}
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/* Configuration.*/
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spip->ssp->CR1 = 0;
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spip->ssp->ICR = ICR_RT | ICR_ROR;
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spip->ssp->CR0 = spip->config->cr0;
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spip->ssp->CPSR = spip->config->cpsr;
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spip->ssp->CR1 = CR1_SSE;
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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->ssp->CR1 = 0;
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spip->ssp->CR0 = 0;
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spip->ssp->CPSR = 0;
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#if LPC_SPI_USE_SSP0
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if (&SPID1 == spip) {
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LPC_SYSCON->PRESETCTRL &= ~1;
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 11);
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LPC_SYSCON->SSP0CLKDIV = 0;
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nvicDisableVector(SSP0_IRQn);
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}
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#endif
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#if LPC_SPI_USE_SSP1
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if (&SPID2 == spip) {
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LPC_SYSCON->PRESETCTRL &= ~4;
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 18);
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LPC_SYSCON->SSP1CLKDIV = 0;
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nvicDisableVector(SSP1_IRQn);
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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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palClearPad(spip->config->ssport, spip->config->sspad);
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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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palSetPad(spip->config->ssport, spip->config->sspad);
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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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spip->rxptr = NULL;
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spip->txptr = NULL;
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spip->rxcnt = spip->txcnt = n;
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ssp_fifo_preload(spip);
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spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
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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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ssp_fifo_preload(spip);
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spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
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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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spip->rxptr = NULL;
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spip->txptr = txbuf;
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spip->rxcnt = spip->txcnt = n;
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ssp_fifo_preload(spip);
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spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
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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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spip->rxptr = rxbuf;
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spip->txptr = NULL;
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spip->rxcnt = spip->txcnt = n;
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ssp_fifo_preload(spip);
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spip->ssp->IMSC = IMSC_ROR | IMSC_RT | IMSC_TX | IMSC_RX;
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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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*
|
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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
|
||
|
|
* @return The received data frame from the SPI bus.
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||
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|
*/
|
||
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uint16_t spi_lld_polled_exchange(SPIDriver *spip, uint16_t frame) {
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||
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|
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||
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spip->ssp->DR = (uint32_t)frame;
|
||
|
|
while ((spip->ssp->SR & SR_RNE) == 0)
|
||
|
|
;
|
||
|
|
return (uint16_t)spip->ssp->DR;
|
||
|
|
}
|
||
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|
||
|
|
#endif /* HAL_USE_SPI */
|
||
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||
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/** @} */
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