STM32U575(Nucleo-U575ZI-Q) SAI Transmit/Receive

[Brian Wang]

When we use STM32U575 communicate with codec(ES8374) on SAI(I2S Bus). In SAI(I2S Bus),  STM32U575 is master and codec is slave. In STM32CubeMX, STM32U575 use SAI1a to Transmit with mode : Master with Master Clock OUT and use SAI1b to Receive with mode : Synchronous Slave. Set SAIa for Transmit and set SAIb for receive.

GPIO Settings :

We set GPDMA1 channel12 and channel13 for SAI

In main() :

MX_SAIQueue_Config():

When we use HAL_SAI_Transmit_DMA(&hsai_BlockA1, (uint8_t *)PlayBuff, PLAY_BUFF_SIZE), MCLK,SCLK,LRCK is working. TX pin transmit data to codec, and codec have sound on speaker. But we use HAL_SAI_Receive_DMA(&hsai_BlockA1, (uint8_t *)RecordBuff, RECORD_BUFF_SIZE), LRCK is not working(MCLK,SCLK is normal). 

We also change Tx and Rx for test. We set SAIa for receive, and set SAIb for transmit. In tihs case, HAL_SAI_Receive_DMA(&hsai_BlockA1, (uint8_t *) can work, but HAL_SAI_Transmit_DMA(&hsai_BlockA1, (uint8_t *)PlayBuff, PLAY_BUFF_SIZE) can not work. Is there anything wrong with my settings?

[Hugo0210]

Hi, Brian,

I suppose you suffered FS with no signal at master RX mode, right? 
SAI_1 subblock A MCLK, FS, SCLK, DATAOUT (SPK)
SAI_1 subblock B DATAIN (DMIC)