SAI3 & EDMA on IMXRT1010

[Syam_Krishnan]

Hello,

I am trying to bring up SAI3 & EDMA on an IMXRT1010 custom board. To start with, I am using evkmimxrt1010_sai_edma_transfer example on IMXRT1010 EVK. I was able to run the demo with SAI 1. I can hear the stored tone. To check SAI3, I edited the code in evkmimxrt1010_sai_edma_transfer. I changed references of SAI1 to SAI3. The lines that I had edited are

Line 26,28, 29 in sai_edma_transfer.c : Changed references of macros from SAI1 to SAI3

41,43, 45 in sai_edma_transfer.c : Changed references of macros from SAI1 to SAI3

61 in sai_edma_tranfer.c : Changed references of macros from SAI1 to SAI3

138 & 142 : Changed references of MCLK output from SAI1 to SAI3

191, 192 & 193: Clock settings changed from SAI1 to SAI3

I am aware that the codec will not work in this case. However, I wanted to see the data transfer, with SAI3 taking in the data and completing the transfer. The code comiled and executed. However, the code gets stuck with 'kStatus_SAI_QueueFull' status message after 4 iterations. The MCU is not reaching the ISR for DMA. Code is not reaching  

WEAK void DMA0_IRQHandler(void)

{   DMA0_DriverIRQHandler();

}

in startup_mimxrt1011.c 

I had checked if the clock settings, NVIC settings ,  DMA settings & SAI3 settings are as per my understanding. I am unable to see anything amiss

CCM_CSCMR1: SAI3_CLK_SEL->SAI3_CLK_SEL_2

CCM_CS1CDR: SAI3_CLK_PRED->SAI3_CLK_PRED_3

TCD0_DADDR 0x401e8020 //this corresponds to the SAI3 TX register address.

TCR3 0x00010000 //this corresponds to the SAI3 TX en

I had spent ~ 2 days and i have ran out of possible solutions. Any leads on this will be highly helpful.

Attached is my modified sai_edma_transfer.c file. 

Thanks

Syam k

[Syam_Krishnan · Accepted solution]

The catch was #define DEMO_SAI_MASTER_SLAVE kSAI_Slave defined in sai_edma_transfer.c  . With WM8960 Codec, the codec makes the BCLK and SAI accepts the clock. When i moved from SAI1 to SAI3, there is no BCLK to drive the SAI. When SAI3 was configured as master, I could see SAI3 taking in data and DMA generating interrupts. Now I will try this code in my custom board with TAS2780.