I have a STM32L433 driving a FDA802 using SAI in I2S standard mode, and it randomly swaps the left and right channels. I have compiled with a small table of interleaved data (two sine waves of different amplitudes) to try an fault find. the code I am testing now simply sets up the SAI, initializes the amplifier over I2C and then the DMA after which it runs the DMA in circular mode, disabling all interrupts and running a while loop to ensure nothing else is interfering . After a while watching on the scope I can see my Left and right channels have swapped. This happens ever time I run it and will never correct itself.
hsai_BlockA1.Instance = SAI1_Block_A;
hsai_BlockA1.Init.AudioMode = SAI_MODEMASTER_TX;
hsai_BlockA1.Init.Synchro = SAI_ASYNCHRONOUS;
hsai_BlockA1.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;
hsai_BlockA1.Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
hsai_BlockA1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_EMPTY;
hsai_BlockA1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_48K;
hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
hsai_BlockA1.Init.MonoStereoMode = SAI_STEREOMODE;
hsai_BlockA1.Init.CompandingMode = SAI_NOCOMPANDING;
hsai_BlockA1.Init.TriState = SAI_OUTPUT_NOTRELEASED;
if (HAL_SAI_InitProtocol(&hsai_BlockA1, SAI_I2S_STANDARD, SAI_PROTOCOL_DATASIZE_16BITEXTENDED, 2) != HAL_OK)
{
Error_Handler();
}
I am running this on another product with a STMH723 and a FDA802 and am having no issues. I am leaning towards a board layout issue but I am wondering if there is anything I have overlooked, or maybe someone has experienced something similar?
thanks so much.
