166 lines
4.8 KiB
C
166 lines
4.8 KiB
C
/*
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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 templates/i2s_lld.c
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* @brief I2S Driver subsystem low level driver source template.
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*
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* @addtogroup I2S
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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_I2S || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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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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/* Driver interrupt handlers. */
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/*===========================================================================*/
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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 I2S driver initialization.
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*
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* @notapi
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*/
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void i2s_lld_init(void) {
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#if STM32_I2S_USE_I2S2
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spiObjectInit(&I2SD2);
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I2SD2.spi = SPI2;
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#endif
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#if STM32_I2S_USE_I2S3
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spiObjectInit(&I2SD3);
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I2SD3.spi = SPI3;
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#endif
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}
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/**
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* @brief Configures and activates the I2S peripheral.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @notapi
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*/
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void i2s_lld_start(I2SDriver *i2sp) {
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/* If in stopped state then enables the SPI and DMA clocks.*/
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if (i2sp->state == I2S_STOP) {
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#if STM32_SPI_USE_SPI2
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if (&SPID2 == spip) {
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bool_t b;
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b = dmaStreamAllocate(spip->dma,
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STM32_I2S_I2S2_IRQ_PRIORITY,
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(stm32_dmaisr_t)i2s_lld_serve_rx_interrupt,
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(void *)spip);
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chDbgAssert(!b, "spi_lld_start(), #1", "stream already allocated");
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rccEnableSPI2(FALSE);
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}
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#endif
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#if STM32_SPI_USE_SPI3
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if (&SPID3 == spip) {
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bool_t b;
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b = dmaStreamAllocate(spip->dma,
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STM32_I2S_I2S3_IRQ_PRIORITY,
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(stm32_dmaisr_t)i2s_lld_serve_rx_interrupt,
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(void *)spip);
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chDbgAssert(!b, "spi_lld_start(), #2", "stream already allocated");
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rccEnableSPI3(FALSE);
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}
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#endif
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}
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/* Configuration.*/
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}
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/**
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* @brief Deactivates the I2S peripheral.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @notapi
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*/
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void i2s_lld_stop(I2SDriver *i2sp) {
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if (i2sp->state == I2S_READY) {
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/* Clock deactivation.*/
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}
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}
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/**
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* @brief Starts a I2S data exchange.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @notapi
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*/
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void i2s_lld_start_exchange(I2SDriver *i2sp) {
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}
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/**
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* @brief Starts a I2S data exchange in continuous mode.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @notapi
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*/
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void i2s_lld_start_exchange_continuous(I2SDriver *i2sp) {
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}
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/**
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* @brief Stops the ongoing data exchange.
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* @details The ongoing data exchange, if any, is stopped, if the driver
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* was not active the function does nothing.
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*
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* @param[in] i2sp pointer to the @p I2SDriver object
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*
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* @notapi
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*/
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void i2s_lld_stop_exchange(I2SDriver *i2sp) {
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}
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#endif /* HAL_USE_I2S */
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/** @} */
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