Example project in SAM_BareMetal_SDK-Rel2.1.2

Hello,

Just a quick question to start. Are you seeing the sine wave correctly if looking at the plot on the SC589? Or you could also send the ADC input to the DAC output on the SC589 and see if you hear a sine wave as well. It would be nice to at least rule out if there is any issues on the SC589 side.

Regards,

Chad

Yes I have checked the Loopback(ADC-DAC). Its working fine. Also I have plotted DMA buffers of A2B Tx in SC589-MINI. It looks proper sine wave

Yes I have checked the Loopback(ADC-DAC). Its working fine. Also I have plotted DMA buffers of A2B Tx in SC589-MINI. It looks proper sine wave

Hi Sivark,

Can you share your SAM FW code too? Another thing you can do is to loop back audio from sam to 594 then back to sam by connecting a2b->594 data pin to 594->a2b data pin in your 594 framework SRU config. If you get good audio, then a2b bus configs are good. If not, should look into a2b configs first.

I reviewed your 594 sport ISR code. not sure if I understand it correctly. 

static void SPORTCallbackRx(
void *pAppHandle,
uint32_t nEvent,
void *pArg
)
{
ADI_SPORT_RESULT eResult;

switch (nEvent)
{
case ADI_SPORT_EVENT_RX_BUFFER_PROCESSED: CallbackCount1++; // CallbackCount1 increase by 1. it is zero after init and becomes 1 here
//CallbackCount1 = (CallbackCount1%2);
Transfer_data();
//FlowControl(read_p,write_p);
break;

default: break;
}
}

void Transfer_data(void)
{
if(CallbackCount1==0) // CallbackCount1 has no chance to be equal to zero
{
for(i=0;i<DMA_BUF_SIZE;i++)
{
DestDataBuf3[i]=DestDataBuf1[i];/*Copy ADC buffer to DAC buffer */
}
}

if(CallbackCount1==1) // CallbackCount1 is one, execute
{
for(i=0;i<DMA_BUF_SIZE;i++)
{
DestDataBuf4[i]=DestDataBuf1[i];/* Copy ADC buffer to DAC buffers */
}
CallbackCount1=0; // CallbackCount1 is set to zero
}
}

CallbackCount1 is always 1 in Transfer_data. If this is true, you always copy samples from DestDataBuf1 to another buffer in the SPORT ISR. DestDataBuf1 and DestDataBuf2 are SPORT RX ping-pong buffers so it seems you are competing with SPORT DMA to access DestDataBuf1. Should double confirm the above code is intended before debugging.