Description
Source
Call Graph
Start Line: 700
int main(void)
{
TRACE_CONFIGURE(DBGU_STANDARD, 115200, BOARD_MCK);
printf("-- USB Device Audio Speaker Project %s --\n\r", SOFTPACK_VERSION);
printf("-- %s\n\r", BOARD_NAME);
printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
// Initialize all PIOs
PIO_Configure(pins, PIO_LISTSIZE(pins));
// Configure and enable the SPI (required for accessing the DAC)
SPI_Configure(BOARD_AT73C213_SPI, BOARD_AT73C213_SPI_ID, SPI_CONFIGURATION);
SPI_Enable(BOARD_AT73C213_SPI);
#if defined(at91sam9260)
// Switch to slow clock oscillator
AT91C_BASE_PMC->PMC_MCKR = (AT91C_BASE_PMC->PMC_MCKR & ~AT91C_PMC_CSS) | AT91C_PMC_CSS_SLOW_CLK;
while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY) != AT91C_PMC_MCKRDY);
// Configure PLLA at 147.456MHz
AT91C_BASE_PMC->PMC_PLLAR = 0x20073F01;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA));
// Switch to slow clock + prescaler
AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_MDIV_2;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
// Switch to PLL + prescaler
AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLLA_CLK;
while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));
// Enable the DAC master clock
AT91C_BASE_PMC->PMC_PCKR[0] = AT91C_PMC_CSS_PLLA_CLK | AT91C_PMC_PRES_CLK_8;
AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_PCK0;
while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_PCK0RDY) == 0);
#else
NormalPowerMode();
#endif
TRACE_CONFIGURE(DBGU_STANDARD, 115200, MCK);
// Initialize the audio DAC
// Configure and enable the DAC
AT73C213_Enable(AUDDSpeakerDriver_SAMPLERATE,
AUDDSpeakerDriver_BYTESPERSAMPLE,
AUDDSpeakerDriver_NUMCHANNELS,
MCK_SEL,
MCK);
// Configure and enable the SSC interrupt
AIC_ConfigureIT(BOARD_AT73C213_SSC_ID,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL | SSC_PRIORITY,
ISR_SSC);
AIC_EnableIT(BOARD_AT73C213_SSC_ID);
// USB audio driver initialization
AUDDSpeakerDriver_Initialize();
// connect if needed
VBUS_CONFIGURE();
while (USBD_GetState() < USBD_STATE_CONFIGURED);
// Infinite loop
while (1) {
if( USBState == STATE_SUSPEND ) {
TRACE_DEBUG("suspend !\n\r");
LowPowerMode();
USBState = STATE_IDLE;
}
if( USBState == STATE_RESUME ) {
// Return in normal MODE
TRACE_DEBUG("resume !\n\r");
NormalPowerMode();
USBState = STATE_IDLE;
}
// Read the incoming audio stream
AUDDSpeakerDriver_Read(buffers[inBufferIndex],
AUDDSpeakerDriver_BYTESPERFRAME,
(TransferCallback) FrameReceived,
0); // No optional argument
}
return 0;
}