void Codec_AudioInterface_Init(uint32_t AudioFreq)
{
//Setup I2C comms to codec
Codec_GPIO_Init();
I2C_Cntrl_Init();
//Bring Up Codec via the I2C comms
Codec_Init();
//Invoke I2S Pin connections
I2S_GPIO_Init();
//Now, get down to defining I2S, Full Duplex, Codec Master Configuration
I2S_InitTypeDef I2S_InitStructure;
/* Enable the CODEC_I2S peripheral clock */
RCC_APB1PeriphClockCmd(CODEC_I2S_CLK, ENABLE);
/* CODEC_I2S peripheral configuration */
I2S_InitStructure.I2S_AudioFreq = AudioFreq;
I2S_InitStructure.I2S_Standard = I2S_Standard_MSB;
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveTx;
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
/* Initialize the I2S peripheral with the structure above */
I2S_Init(CODEC_I2S, &I2S_InitStructure);
I2S_FullDuplexConfig(I2S3ext, &I2S_InitStructure);
//Turn on the I2S interface
I2S_Cmd(CODEC_I2S, ENABLE);
I2S_Cmd(I2S3ext, ENABLE);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
*/
/* I2S configuration -------------------------------------------------------*/
I2S_Config();
/* SysTick configuration ---------------------------------------------------*/
SysTickConfig();
/* LEDs configuration ------------------------------------------------------*/
STM_EVAL_LEDInit(LED1);
STM_EVAL_LEDInit(LED2);
STM_EVAL_LEDInit(LED3);
STM_EVAL_LEDInit(LED4);
#ifdef I2S_MASTER
/* Master full Duplex configuration ----------------------------------------*/
/* Clear the Rx Master Buffer */
Fill_Buffer((uint8_t*)aRxMasterBuffer, (TX_MASTER_BUFFERSIZE*2));
/* Configure I2Sx in Master Transmitter Mode */
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
I2S_Init(I2Sx, &I2S_InitStructure);
/* Configure the I2Sx_ext (the second instance) in Slave Receiver Mode */
I2S_FullDuplexConfig(I2Sxext, &I2S_InitStructure);
/* Enable the I2Sx peripheral */
I2S_Cmd(I2Sx, ENABLE);
/* Enable the I2Sx_ext peripheral for Full Duplex mode */
I2S_Cmd(I2Sxext, ENABLE);
/* Master full Duplex Communication ----------------------------------------*/
/* Communication Full Duplex Started */
ubBufferCounter = 0;
while ((ubBufferCounter != TX_MASTER_BUFFERSIZE))
{
/* Data to transmitted through I2Sx SD pin */
while (SPI_I2S_GetFlagStatus(I2Sx, SPI_I2S_FLAG_TXE ) != SET);
SPI_I2S_SendData(I2Sx, aTxMasterBuffer[ubBufferCounter]);
/* Data Received through I2Sx_ext SD pin */
while (SPI_I2S_GetFlagStatus(I2Sxext, SPI_I2S_FLAG_RXNE ) != SET);
aRxMasterBuffer[ubBufferCounter] = SPI_I2S_ReceiveData(I2Sxext);
ubBufferCounter++;
}
/* Communication Full Duplex Finished */
I2S_Cmd(I2Sx, DISABLE);
I2S_Cmd(I2Sxext, DISABLE);
/* Check Communication Result ----------------------------------------------*/
if (Buffercmp((uint8_t*)aRxMasterBuffer, (uint8_t*)aTxSlaveBuffer, (TX_SLAVE_BUFFERSIZE*2)) != FAILED)
{
/* Turn ON LED2 and LED4 */
STM_EVAL_LEDOn(LED2);
STM_EVAL_LEDOn(LED4);
}
#endif /* I2S_MASTER */
#ifdef I2S_SLAVE
/* Slave full Duplex configuration ----------------------------------------*/
/* Clear the RxBuffer */
Fill_Buffer((uint8_t*)aRxSlaveBuffer, (TX_SLAVE_BUFFERSIZE*2));
/* Configure I2Sx in Slave Receiver Mode */
I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveRx;
I2S_Init(I2Sx, &I2S_InitStructure);
/* Configure the I2Sx_ext (the second instance) in Slave Transmitter Mode */
I2S_FullDuplexConfig(I2Sxext, &I2S_InitStructure);
/* Enable the I2Sx_ext peripheral for Full Duplex mode */
I2S_Cmd(I2Sxext, ENABLE);
/* Enable the I2Sx peripheral */
I2S_Cmd(I2Sx, ENABLE);
/* Slave full Duplex Communication -----------------------------------------*/
/* Communication Full Duplex Started */
ubBufferCounter = 0;
while ((ubBufferCounter != TX_SLAVE_BUFFERSIZE) )
{
/* Data to transmitted through I2Sx_ext SD pin */
while (SPI_I2S_GetFlagStatus(I2Sxext, SPI_I2S_FLAG_TXE ) != SET);
SPI_I2S_SendData(I2Sxext, aTxSlaveBuffer[ubBufferCounter]);
/* Data Received through I2Sx SD pin */
while (SPI_I2S_GetFlagStatus(I2Sx, SPI_I2S_FLAG_RXNE ) != SET);
aRxSlaveBuffer[ubBufferCounter] = SPI_I2S_ReceiveData(I2Sx);
ubBufferCounter++;
}
/* Communication full duplex Finished */
I2S_Cmd(I2Sx, DISABLE);
I2S_Cmd(I2Sxext, DISABLE);
/* Check Communication Results ---------------------------------------------*/
if (Buffercmp((uint8_t*)aRxSlaveBuffer, (uint8_t*)aTxMasterBuffer, (TX_SLAVE_BUFFERSIZE*2)) != FAILED)
{
/* Turn ON LED3 */
STM_EVAL_LEDOn(LED3);
}
#endif /* I2S_SLAVE */
while(1)
{
}
}
