main
Default mainpageusb-device-audio-speaker-projectmain
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;
}