topic Re: Playing audio on FRDM-K66 in Kinetis Software Development Kit

Playing audio on FRDM-K66

ReySinTrono — Fri, 30 Sep 2016 08:06:52 GMT

Any example about transmit wav audio over DA7212 with eDMA and FreeRTOS in FRDM-K66?

Thanks.

Re: Playing audio on FRDM-K66

isaacavila — Wed, 05 Oct 2016 20:11:43 GMT

Hello Juan,

This example is still not available (I would expect to be included in future KSDK's releases) but you can meanwhile refer to SAI example available for TWR-K65F180M:

At <KSDK_2_0_TWR-K65F180M_PATH>\boards\twrk65f180m\demo_apps\sai you will find an example on how to send data to SAI module through DMA (it uses the TWR-AUDIO board which contains a SGTL5000 codec). It takes some internal data and send it to SAI module through DMA. It is not exactly a WAV audio but it can be useful for the main process of sending data to codec.

For DA7212's part, you can ask Dialog for any initialization code and based on it, you can configure SAI module as master/slave.

You can also check this post that can be helpful: https://community.nxp.com/message/807693?commentID=807693#comment-807693

I hope this can help!

Best Regards,

Isaac

Re: Playing audio on FRDM-K66

ReySinTrono — Fri, 25 Nov 2016 11:29:53 GMT

Thanks.

Now, I test project "sai_edma_transfer_frdmk66f". This is ok, but when looping the function SAI_TransferSendEDMA, sound tone and a "pop" every time I call that function. For what is this?

Re: Playing audio on FRDM-K66

isaacavila — Mon, 28 Nov 2016 20:30:54 GMT

Hello Juande,

This example was not designed to play a sound continuously and instead of it, only one transfer is being trigger. The "pop" that you heard is caused due lack of sample until the next samples are sent.

You can avoid this scenario by adding logic to current example (ping-pong buffer, RTOS environment to manage audio task).

I hope this helps!

Regards,

Isaac