CS43L22 analog passthrough

Posted on July 19, 2017 at 13:28

Can anyone help me with using the codec CS43L22 in analog passthrough mode on STM32F4-Discovery.

Flow of application

Analog Input ---> ADC ---> DAC ---> CS43L22 ---> Headphone or Speaker

I have got ADC and DAC working, but the codec is not working.

This topic has been closed for replies.

Super User

Posted on July 19, 2017 at 13:33

CS43L22 *is* a DAC, so you want

Analog Input ---> ADC ---> [data in processor] --->[I2S]---> CS43L22 ---> Headphone or Speaker

JW

Associate II

Posted on July 19, 2017 at 13:39

Hi Jan,

CS43L22 requires data in PCM format. I'm recording audio over an external microphone and need to transfer as analog data to codec.

Super User

Posted on July 19, 2017 at 14:17

This looks pretty much I2S to me.

PCM is just to say that ''amplitude samples are taken regularly'' (as opposed to other forms of modulation, for example delta-sigma).

JW

Associate

Posted on June 05, 2018 at 06:03

I've made my CS43L22 Passthrough worked: provide MCLK by calling 'HAL_I2S_Transmit_DMA' even we do not use I2S audio data.

The Beep is the same.

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