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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file i2s.c
* @brief I2S Driver code.
*
* @addtogroup I2S
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_I2S || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* 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) {
chDbgCheck((i2sp != NULL) && (config != NULL), "i2sStart");
chSysLock();
chDbgAssert((i2sp->state == I2S_STOP) || (i2sp->state == I2S_READY),
"i2sStart(), #1", "invalid state");
i2sp->config = config;
i2s_lld_start(i2sp);
i2sp->state = I2S_READY;
chSysUnlock();
}
/**
* @brief Deactivates the I2S peripheral.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @api
*/
void i2sStop(I2SDriver *i2sp) {
chDbgCheck(i2sp != NULL, "i2sStop");
chSysLock();
chDbgAssert((i2sp->state == I2S_STOP) || (i2sp->state == I2S_READY),
"i2sStop(), #1", "invalid state");
i2s_lld_stop(i2sp);
i2sp->state = I2S_STOP;
chSysUnlock();
}
/**
* @brief Starts a I2S transmission.
* @details The transmission is started and it is executes until the specified
* buffer has entirely transmitted.
* @post A callback is invoked when the buffer has been fully transmitted.
*
* @param[in] i2sp pointer to the @p I2SDriver object
* @param[in] n number of samples to send
* @param[in] txbuf the pointer to the transmit buffer
*
* @api
*/
void i2sStartSendOnce(I2SDriver *i2sp, size_t n,
const i2ssample_t *txbuf) {
chDbgCheck((i2sp != NULL) && (n > 0) && (txbuf != NULL),
"i2sStartSendOnce");
chSysLock();
chDbgAssert(i2sp->state == I2S_READY, "i2sStartSendOnce(), #1",
"not ready");
i2sStartSendOnceI(i2sp, n, txbuf);
chSysUnlock();
}
/**
* @brief Starts a continuous I2S transmission.
* @details The transmission is started and it is executes continuously
* until @p i2sStopSend() has been explicitly invoked .
* @post A callback is invoked when the buffer has been half transmitted
* and fully transmitted.
*
* @param[in] i2sp pointer to the @p I2SDriver object
* @param[in] n number of samples to send
* @param[in] txbuf the pointer to the transmit buffer
*
* @api
*/
void i2sStartSendContinuous(I2SDriver *i2sp, size_t n,
const i2ssample_t *txbuf) {
chDbgCheck((i2sp != NULL) && (n > 0) && (txbuf != NULL),
"i2sStartSendContinuous");
chSysLock();
chDbgAssert(i2sp->state == I2S_READY, "i2sStartSendContinuous(), #1",
"not ready");
i2sStartSendContinuousI(i2sp, n, txbuf);
chSysUnlock();
}
/**
* @brief Stops the ongoing transmission.
* @details The ongoing transmission, if any, is stopped, if the driver
* was not transmitting the function does nothing.
*
* @param[in] i2sp pointer to the @p I2SDriver object
*
* @api
*/
void i2sStopSend(I2SDriver *i2sp) {
chDbgCheck((i2sp != NULL), "i2sStopSend");
chSysLock();
chDbgAssert((i2sp->state == I2S_READY) ||
(i2sp->state == I2S_ACTIVE) ||
(i2sp->state == I2S_COMPLETE),
"i2sStopSend(), #1", "not ready");
i2sStopSendI(i2sp);
chSysUnlock();
}
#endif /* HAL_USE_I2S */
/** @} */
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