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/*
ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file i2s.c
* @brief I2S Driver code.
*
* @addtogroup I2S
* @{
*/
#include "hal.h"
#if (HAL_USE_I2S == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief I2S Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void i2sInit(void) {
i2s_lld_init();
}
/**
* @brief Initializes the standard part of a @p I2SDriver structure.
*
* @param[out] i2sp pointer to the @p I2SDriver object
*
* @init
*/
void i2sObjectInit(I2SDriver *i2sp) {
i2sp->state = I2S_STOP;
i2sp->config = NULL;
}
/**
* @brief Configures and activates the I2S peripheral.
*
* @param[in] i2sp pointer to the @p I2SDriver object
* @param[in] config pointer to the @p I2SConfig object
*
* @api
*/
void i2sStart(I2SDriver *i2sp, const I2SConfig *config) {
osalDbgCheck((i2sp != NULL) && (config != NULL));
osalSysLock();
osalDbgAssert((i2sp->state == I2S_STOP) || (i2sp->state == I2S_READY),
"invalid state");
i2sp->config = config;
i2s_lld_start(i2sp);
i2sp->state = I2S_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the I2S peripheral.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @api
*/
void i2sStop(I2SDriver *i2sp) {
osalDbgCheck(i2sp != NULL);
osalSysLock();
osalDbgAssert((i2sp->state == I2S_STOP) || (i2sp->state == I2S_READY),
"invalid state");
i2s_lld_stop(i2sp);
i2sp->state = I2S_STOP;
osalSysUnlock();
}
/**
* @brief Starts a I2S data exchange.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @api
*/
void i2sStartExchange(I2SDriver *i2sp) {
osalDbgCheck(i2sp != NULL);
osalSysLock();
osalDbgAssert(i2sp->state == I2S_READY, "not ready");
i2sStartExchangeI(i2sp);
osalSysUnlock();
}
/**
* @brief Stops the ongoing data exchange.
* @details The ongoing data exchange, if any, is stopped, if the driver
* was not active the function does nothing.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @api
*/
void i2sStopExchange(I2SDriver *i2sp) {
osalDbgCheck((i2sp != NULL));
osalSysLock();
osalDbgAssert((i2sp->state == I2S_READY) ||
(i2sp->state == I2S_ACTIVE) ||
(i2sp->state == I2S_COMPLETE),
"invalid state");
i2sStopExchangeI(i2sp);
osalSysUnlock();
}
#endif /* HAL_USE_I2S == TRUE */
/** @} */
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