Hi experts
I'm using demo evkbmimxrt1170_sai_edma_record_playback_cm7, and I'm using this API
status_t SAI_TransferReceiveLoopEDMA(I2S_Type *base,
sai_edma_handle_t *handle,
sai_transfer_t *xfer,
uint32_t loopTransferCount)
I want to change SAI1 it to 4 rx like this :
How could I use SAI_TransferReceiveLoopEDMA to receive 4 rx?
Thanks
Hi @starwarrior ,
Seems you didn't enable the fifo combined mode for SAI multi channels, so the result was not as expected, and we provide such demo within the RT1170EVKB SDK package, but it requires CS42448 Audio board as well. Please kindly refer to that demo for details.
Hope that helps,
Have a great day,
Kan
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Hi Kan
Here is the project I changed "evkmimxrt1170_sai_edma_record_playback_cm7" running on
MIMXRT1170-EVK.
It can only receive rx0,. rx1、2 will pull the signal down to about 0.5V. rx4 didn't pull it down ,but neither can it receive the right data , only receive zero
Could you please help to test it ?
Thanks
Hi Kan
Still the example evkmimxrt1170evm_sai_edma_record_playback_cm7, which use API SAI_TransferReceiveEDMA(DEMO_SAI, &rxHandle, &xfer)).After changing it to multichannel like this：
SAI_GetClassicI2SConfig(&saiConfig, DEMO_AUDIO_BIT_WIDTH, kSAI_Stereo, (1U << DEMO_SAI_CHANNEL)|(1U << DEMO_SAI_CHANNEL1));
saiConfig.syncMode = DEMO_SAI_RX_SYNC_MODE;
saiConfig.bitClock.bclkPolarity = DEMO_SAI_TX_BIT_CLOCK_POLARITY;
saiConfig.masterSlave = DEMO_SAI_MASTER_SLAVE;
saiConfig.fifo.fifoCombine = kSAI_FifoCombineModeEnabledOnRead;
SAI_TransferRxSetConfigEDMA(DEMO_SAI, &rxHandle, &saiConfig);
It will not able to enter into the rx_callback. Can you possibly try to test it?
Thanks
Hi @starwarrior ,
Please use the following API instead.
Hope that helps,
Have a great day,
Kan
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Hi Kan
Thanks for the quick reply. I have already used this API like this
SAI_GetClassicI2SConfig(&saiConfig, DEMO_AUDIO_BIT_WIDTH, kSAI_Stereo, (1U << DEMO_SAI_CHANNEL)|(1U << DEMO_SAI_CHANNEL1));
saiConfig.syncMode = DEMO_SAI_TX_SYNC_MODE;
saiConfig.bitClock.bclkPolarity = DEMO_SAI_TX_BIT_CLOCK_POLARITY;
saiConfig.masterSlave = DEMO_SAI_MASTER_SLAVE;
saiConfig.syncMode = DEMO_SAI_RX_SYNC_MODE;
saiConfig.fifo.fifoCombine = kSAI_FifoCombineModeEnabledOnRead;
SAI_TransferRxSetConfigEDMA(DEMO_SAI, &rxHandle, &saiConfig);
And now I need to use SAI_TransferReceiveLoopEDMA to receive both audio. It looks like this API do not support multichannel ,anything I need to change?
Best Regards
Nick
Hi @starwarrior ,
We provide docs on how to configure the SAI DMA driver to support multiple SAI channels, please kindly refer to https://mcuxpresso.nxp.com/mcuxsdk/25.06.00/html/drivers/RT/RT1170/MIMXRT1176/index.html#sai-edma-dr... for details.
Have a great day,
Kan
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