156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 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 i2s.c
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* @brief I2S Driver code.
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*
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* @addtogroup I2S
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* @{
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*/
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#include "hal.h"
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#if (HAL_USE_I2S == TRUE) || 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 exported functions. */
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/*===========================================================================*/
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/**
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* @brief I2S Driver initialization.
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* @note This function is implicitly invoked by @p halInit(), there is
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* no need to explicitly initialize the driver.
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*
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* @init
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*/
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void i2sInit(void) {
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i2s_lld_init();
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}
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/**
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* @brief Initializes the standard part of a @p I2SDriver structure.
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*
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* @param[out] i2sp pointer to the @p I2SDriver object
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*
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* @init
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*/
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void i2sObjectInit(I2SDriver *i2sp) {
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i2sp->state = I2S_STOP;
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i2sp->config = NULL;
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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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* @param[in] config pointer to the @p I2SConfig object
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*
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* @api
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*/
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void i2sStart(I2SDriver *i2sp, const I2SConfig *config) {
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osalDbgCheck((i2sp != NULL) && (config != NULL));
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osalSysLock();
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osalDbgAssert((i2sp->state == I2S_STOP) || (i2sp->state == I2S_READY),
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"invalid state");
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i2sp->config = config;
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i2s_lld_start(i2sp);
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i2sp->state = I2S_READY;
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osalSysUnlock();
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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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* @api
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*/
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void i2sStop(I2SDriver *i2sp) {
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osalDbgCheck(i2sp != NULL);
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osalSysLock();
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osalDbgAssert((i2sp->state == I2S_STOP) || (i2sp->state == I2S_READY),
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"invalid state");
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i2s_lld_stop(i2sp);
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i2sp->state = I2S_STOP;
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osalSysUnlock();
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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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* @api
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*/
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void i2sStartExchange(I2SDriver *i2sp) {
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osalDbgCheck(i2sp != NULL);
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osalSysLock();
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osalDbgAssert(i2sp->state == I2S_READY, "not ready");
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i2sStartExchangeI(i2sp);
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osalSysUnlock();
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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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* @api
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*/
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void i2sStopExchange(I2SDriver *i2sp) {
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osalDbgCheck((i2sp != NULL));
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osalSysLock();
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osalDbgAssert((i2sp->state == I2S_READY) ||
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(i2sp->state == I2S_ACTIVE) ||
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(i2sp->state == I2S_COMPLETE),
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"invalid state");
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i2sStopExchangeI(i2sp);
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osalSysUnlock();
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}
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#endif /* HAL_USE_I2S == TRUE */
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/** @} */
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