In the KSDK v-1.1 API Reference Manual Rev. 0 (file:///C:/Freescale/KSDK_1.1.0/doc/Kinetis%20SDK%20v.1.1%20API%20Reference%20Manual/group__sai__driver.html)
the steps to use SAI is as follows:
| 1. Initialize the SAI module by calling the SAI_DRV_TxInit() function. |
| 2. Configure the audio data features of SAI by calling the SAI_DRV_TxConfigDataFormat() function. |
| 3. Send/receive data by calling the SAI_DRV_SendData() or the SAI_DRV_ReceiveData() functions. |
| 4. Start Tx or Rx by calling the SAI_DRV_TxStartModule() or the SAI_DRV_RxStartModule() function. |
| 5. Shut down the SAI module by calling the SAI_DRV_TxDeinit() function. |
But when I investigate the source (KSDK_1.1.0\platform\sai\fsl_sai_driver.c)
The Send/Receive_Data looks like this:
/*FUNCTION**********************************************************************
*
* Function Name : SAI_DRV_SendData
* Description : The function would tell sai driver to start send a period of
* data to sai tx fifo.
*END**************************************************************************/
uint32_t SAI_DRV_SendData(uint32_t instance, uint8_t *addr, uint32_t len)
{
sai_state_ids[instance][0]->len = len;
sai_state_ids[instance][0]->address= addr;
SAI_DRV_TxStartModule(instance);
return len;
}
/*FUNCTION**********************************************************************
*
* Function Name : SAI_DRV_ReceiveData
* Description : The function would tell sai driver to start receive a period of
* data from sai rx fifo.
*END**************************************************************************/
uint32_t SAI_DRV_ReceiveData(uint32_t instance, uint8_t *addr, uint32_t len)
{
sai_state_ids[instance][1]->len = len;
sai_state_ids[instance][1]->address= addr;
SAI_DRV_RxStartModule(instance);
return len;
}
The #4 (SAI_DRV_TxStartModule() / SAI_DRV_RxStartModule()) is performed by SAI_DRV_SendData() / SAI_DRV_ReceiveData() and are not necessary to call again.
