162 lines
4.6 KiB
C
162 lines
4.6 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 STM32/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 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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/*===========================================================================*/
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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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