topic How to read audio data from a mic using SAI / I2S in Kinetis Microcontrollers

How to read audio data from a mic using SAI / I2S

mikeross — Wed, 02 Nov 2016 14:39:58 GMT

Hello,

I am working with MK82FN256VLL15 MCU. I am trying to read the audio data from a MIC using SAI/I2S protocol.

Using a logic analyzer I could see the data being transmitted from mic to the MCU. But when I print the buffer I get only zeros.

I have attached the screenshot of from the logic analyzer and also the code.

Any help is very much appreciated.

Thank you in advance

Mike

Original Attachment has been moved to: i2s_mic.c.zip

Re: How to read audio data from a mic using SAI / I2S

mikeross — Mon, 07 Nov 2016 10:45:51 GMT

Is anyone working on #i2s/sai‌, can you please help me troubleshoot this problem with communication between the MCU and the mic?

Re: How to read audio data from a mic using SAI / I2S

xiangjun_rong — Tue, 15 Nov 2016 09:51:33 GMT

Hi, Mike,

Sorry for the delay, I have the code based on TWR-K64F, you can refer to the I2S receiver part. The code is assumed that the I2S bit clock and frame clock are output from K64, each frame has two slots, each slots includes 32 bit clock, the frame clock signal convers 32 bit clock.

Hope it can help you

XiangJun Rong