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Example project in SAM_BareMetal_SDK-Rel2.1.2

Category: Software
Product Number: SC589-MINI, A2B AD2428
Software Version: SAM_BareMetal_SDK-Rel2.1.2

I have taken example project for SAM board(C:\Analog Devices\SAM_BareMetal_SDK-Rel2.1.2\framework) and customized based on the setup I am using.

I am using SAM as Main Node and SC594(SOM Carrier EZ-Kit + SC594-SOM + AD2428_Mini) as sub-node1. Please find the image of setup as below

I am planning to receive 2 channels from SAM board to SC594 setup through A2B

Customization Done in code is as below

1. I have made ENABLE_A2B macro as true in the file audio_system_config.h

2. In processaudio_callback() function I have added below lines in for loop to copy data from ADC to A2B.
//Send audio in from ADAU1761 to the A2B bus
audiochannel_a2b_0_left_out[i] = audiochannel_0_left_in[i];
audiochannel_a2b_0_right_out[i] = audiochannel_0_right_in[i];

3. I have also modified schematics and exported Command list file and used it in project. Please find the updated schematics attached(A2B Topology (4down-TDM8)

When I provide sine tone to SAM board and tried to halt the code in SC594 and check the DMA buffer I am not getting the sine tone. I am getting plot as below


A2B Topology (4down-TDM8)

Please find the source code running in SC594 board attached

Please let me know your feedback on this

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  • 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

    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);

    default: break;

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

    if(CallbackCount1==1) // CallbackCount1 is one, execute
    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.