Пример #1
0
/*
 * Application entry point.
 */
int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Starting and configuring the I2S driver 2.
   */
  i2sStart(&I2SD2, &i2scfg);
  palSetPadMode(GPIOB, 10, PAL_MODE_ALTERNATE(5));
  palSetPadMode(GPIOC, 3, PAL_MODE_ALTERNATE(5));

  /*
   * Starting continuous I2S transfer.
   */
  i2sStartExchange(&I2SD2);

  /*
   * Normal main() thread activity, if the button is pressed then the I2S
   * transfer is stopped.
   */
  while (true) {
    if (palReadPad(GPIOA, GPIOA_BUTTON))
      i2sStopExchange(&I2SD2);
    chThdSleepMilliseconds(500);
  }
  return 0;
}
void mp45dt02Init(mp45dt02Config *config)
{
#if 0
    PRINT("Initialising mp45dt02.\n\r"
          "mp45dt02I2sData.buffer size: %u words %u bytes\n\r"
          "mp45dt02ExpandedBuffer size: %u words %u bytes\n\r"
          "MP45DT02_DECIMATED_BUFFER_SIZE: %u",
          MP45DT02_I2S_BUFFER_SIZE_2B, sizeof(mp45dt02I2sData.buffer),
          MP45DT02_EXPANDED_BUFFER_SIZE, sizeof(mp45dt02ExpandedBuffer),
          MP45DT02_DECIMATED_BUFFER_SIZE);
#endif

    initConfig = *config;

    chSemObjectInit(&mp45dt02ProcessingSem, 0);

    pMp45dt02ProcessingThd = chThdCreateStatic(mp45dt02ProcessingThdWA,
                                               sizeof(mp45dt02ProcessingThdWA),
                                               NORMALPRIO,
                                               mp45dt02ProcessingThd, NULL);

    dspInit();

    memset(&mp45dt02I2sData, 0, sizeof(mp45dt02I2sData));
    mp45dt02I2sData.guard = MEMORY_GUARD;

    memset(&mp45dt02I2SConfig, 0, sizeof(mp45dt02I2SConfig));
    mp45dt02I2SConfig.tx_buffer = NULL;
    mp45dt02I2SConfig.rx_buffer = mp45dt02I2sData.buffer;
    mp45dt02I2SConfig.size      = MP45DT02_I2S_BUFFER_SIZE_2B;
    mp45dt02I2SConfig.end_cb    = mp45dt02Cb;

    mp45dt02I2SConfig.i2scfgr   = I2SCFG_MODE_MASTER_RECEIVE    |
                                  I2SCFG_STD_MSB_JUSTIFIED      |
                                  I2SCFG_CKPOL_STEADY_HIGH;

    mp45dt02I2SConfig.i2spr     = (SPI_I2SPR_I2SDIV & MP45DT02_I2SDIV) |
                                  (SPI_I2SPR_ODD & (MP45DT02_I2SODD << I2SPR_I2SODD_SHIFT));

    i2sStart(&MP45DT02_I2S_DRIVER, &mp45dt02I2SConfig);
    i2sStartExchange(&MP45DT02_I2S_DRIVER);
}