tinySA/os/hal/platforms/STM32/i2s_lld.c

/*
    ChibiOS/RT - Copyright (C) 2006-2013 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    STM32/i2s_lld.c
 * @brief   I2S Driver subsystem low level driver source template.
 *
 * @addtogroup I2S
 * @{
 */

#include "ch.h"
#include "hal.h"

#if HAL_USE_I2S || defined(__DOXYGEN__)

/*===========================================================================*/
/* Driver local definitions.                                                 */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported variables.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local variables and types.                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Driver local functions.                                                   */
/*===========================================================================*/

/*===========================================================================*/
/* Driver interrupt handlers.                                                */
/*===========================================================================*/

/*===========================================================================*/
/* Driver exported functions.                                                */
/*===========================================================================*/

/**
 * @brief   Low level I2S driver initialization.
 *
 * @notapi
 */
void i2s_lld_init(void) {

#if STM32_I2S_USE_I2S2
  spiObjectInit(&I2SD2);
  I2SD2.spi = SPI2;
#endif

#if STM32_I2S_USE_I2S3
  spiObjectInit(&I2SD3);
  I2SD3.spi = SPI3;
#endif
}

/**
 * @brief   Configures and activates the I2S peripheral.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @notapi
 */
void i2s_lld_start(I2SDriver *i2sp) {

  /* If in stopped state then enables the SPI and DMA clocks.*/
  if (i2sp->state == I2S_STOP) {
#if STM32_SPI_USE_SPI2
    if (&SPID2 == spip) {
      bool_t b;
      b = dmaStreamAllocate(spip->dma,
                            STM32_I2S_I2S2_IRQ_PRIORITY,
                            (stm32_dmaisr_t)i2s_lld_serve_rx_interrupt,
                            (void *)spip);
      chDbgAssert(!b, "spi_lld_start(), #1", "stream already allocated");
      rccEnableSPI2(FALSE);
    }
#endif
#if STM32_SPI_USE_SPI3
    if (&SPID3 == spip) {
      bool_t b;
      b = dmaStreamAllocate(spip->dma,
                            STM32_I2S_I2S3_IRQ_PRIORITY,
                            (stm32_dmaisr_t)i2s_lld_serve_rx_interrupt,
                            (void *)spip);
      chDbgAssert(!b, "spi_lld_start(), #2", "stream already allocated");
      rccEnableSPI3(FALSE);
    }
#endif
  }
  /* Configuration.*/
}

/**
 * @brief   Deactivates the I2S peripheral.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @notapi
 */
void i2s_lld_stop(I2SDriver *i2sp) {

  if (i2sp->state == I2S_READY) {
    /* Clock deactivation.*/

  }
}

/**
 * @brief   Starts a I2S data exchange.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @notapi
 */
void i2s_lld_start_exchange(I2SDriver *i2sp) {

}

/**
 * @brief   Starts a I2S data exchange in continuous mode.
 *
 * @param[in] i2sp      pointer to the @p I2SDriver object
 *
 * @notapi
 */
void i2s_lld_start_exchange_continuous(I2SDriver *i2sp) {

}

/**
 * @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
 *
 * @notapi
 */
void i2s_lld_stop_exchange(I2SDriver *i2sp) {

}

#endif /* HAL_USE_I2S */

/** @} */