/**
* \brief Application entry point for ssc_dam_audio example.
*
* \return Unused (ANSI-C compatibility).
*/
int main( void )
{
uint16_t data = 0;
/* Disable watchdog */
WDT_Disable( WDT ) ;
/* Enable I and D cache */
SCB_EnableICache();
SCB_EnableDCache();
/* Output example information */
printf("-- SSC DMA Audio Example %s --\n\r", SOFTPACK_VERSION);
printf("-- %s\n\r", BOARD_NAME);
printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
/* Configure systick for 1 ms. */
printf( "Configure system tick to get 1ms tick period.\n\r" ) ;
if ( TimeTick_Configure( ) )
{
printf("-F- Systick configuration error\n\r" ) ;
}
/* Configure all pins */
PIO_Configure(pinsSsc, PIO_LISTSIZE(pinsSsc));
/* Configure SSC */
SSC_Configure(AUDIO_IF , 0 , SSC_MCK );
SSC_ConfigureReceiver(AUDIO_IF,I2S_SLAVE_RX_SETTING,I2S_SLAVE_RX_FRM_SETTING);
SSC_DisableReceiver(AUDIO_IF);
SSC_ConfigureTransmitter(AUDIO_IF,I2S_SLAVE_TX_SETTING,I2S_SLAVE_TX_FRM_SETTING);
SSC_DisableTransmitter(AUDIO_IF);
/* Configure DMA */
Dma_configure();
/* Configure and enable the TWI (required for accessing the DAC) */
PMC_EnablePeripheral(ID_TWIHS0);
TWI_ConfigureMaster(TWIHS0, TWI_CLOCK, BOARD_MCK);
TWID_Initialize(&twid, TWIHS0);
/* Configure TWI interrupts */
NVIC_ClearPendingIRQ(TWIHS0_IRQn);
NVIC_EnableIRQ(TWIHS0_IRQn);
/* check that WM8904 is present */
WM8904_Write(&twid, WM8904_SLAVE_ADDRESS, 22, 0);
data=WM8904_Read(&twid, WM8904_SLAVE_ADDRESS, 0);
if( data != 0x8904){
printf("WM8904 not found!\n\r");
while(1);
}
/* Initialize the audio DAC */
WM8904_Init(&twid, WM8904_SLAVE_ADDRESS, PMC_MCKR_CSS_SLOW_CLK);
/* Enable the DAC master clock */
PMC_ConfigurePCK2(PMC_MCKR_CSS_SLOW_CLK, PMC_MCKR_PRES_CLK_1 );
printf("Insert Line-in cable with PC Headphone output\n\r");
PlayRecording();
while ( 1 );
}
/**
* Configure the TWI and DACC for audio output.
* \param sampleRate Audio sample rate.
* \param mck MCK frequency.
*/
static void _ConfigureAudioPlay(uint32_t sampleRate, uint32_t mck)
{
/* -- Pins Configuration -- */
PIO_Configure(pinsAudio, PIO_LISTSIZE(pinsAudio));
/* -- SSC Configuration -- */
sampleRate = sampleRate; /*dummy */
SSC_Configure(SSC, 0, mck);
SSC_DisableTransmitter(SSC);
SSC_DisableReceiver(SSC);
SSC_ConfigureTransmitter(SSC, I2S_SLAVE_TX_SETTING, I2S_SLAVE_TX_FRM_SETTING);
SSC_DisableTransmitter(SSC);
/* Enable TWI peripheral clock */
PMC_EnablePeripheral(ID_TWIHS0);
/* Configure and enable the TWI (required for accessing the DAC) */
TWI_ConfigureMaster(TWIHS0, TWI_CLOCK, mck);
TWID_Initialize(&twid, TWIHS0);
/* Initialize the audio DAC
*/
WM8904_Write(&twid, WM8904_SLAVE_ADDRESS, WM8904_REG_RESET, 0);
Wait(100);
/* WM8904 as master */
if (WM8904_Read(&twid, WM8904_SLAVE_ADDRESS, 0) != 0x8904) {
printf("WM8904 not found!\n\r");
while (1);
}
WM8904_Init(&twid, WM8904_SLAVE_ADDRESS, PMC_MCKR_CSS_SLOW_CLK);
_SyncAdjust(0);
PMC_ConfigurePCK2(PMC_MCKR_CSS_SLOW_CLK, PMC_MCKR_PRES_CLK_1);
/* Mute */
AudioPlayEnable(0);
}
