How to play a tone cyclically through SAI channel

[BlackTurbo]

Hi, I have a question about how to cyclically play a tone wav through SAI channel. Currently I'm using a RT1062 for my GUI application, one of the tone requirement is to play a beep sound continuousely once I keep a button pressed. But I don't know how to cyclically play the beep. Could someone help with it?

Thanks.

@markruthenbeck 

[kerryzhou]

Hi @BlackTurbo 

   Thank you for your interest in the NXP MIMXRT product, I would like to provide service for you.

   If you want to cyclically play a tone wav, you can use the timer, when the time is reach, then you can trigger the SAI transfer.

   About the SAI transfer code, you can refer to the RT SDK:

SDK_2_10_0_EVK-MIMXRT1060\boards\evkmimxrt1060\driver_examples\sai\edma_transfer

Wish it helps you!

Best Regards,

Kerry

[BlackTurbo]

Is the Scatter/gather feature (through eDMA TCD config) applied for this application?

[kerryzhou]

Hi @BlackTurbo ,

   Why you need to use the scatter/gather function?

   From the DMA scatter/gather function, you can see:

Scatter/gather is the process of automatically loading a new TCD into a channel. It allows
a DMA channel to use multiple TCDs; this enables a DMA channel to scatter the DMA
data to multiple destinations or gather it from multiple sources.

   But to you, your destination is the same SAI data buffer, not the multiple destination.

  So, you can refer to the SDK DMA SAI code, and transfer your SAI data, then in the other time(you can use timer to define your needed time), periodically send the data.

Wish it helps you!

Best Regards,

Kerry