stm32f769i-DISCO audio line in

[Beaulier.Francois]

Posted on November 20, 2016 at 14:50

Hi,

I'am trying to get the audio from WM8994 line input.The BSP driver seems rather incomplete, it works with the 4 mems mics but not with the line input from the codec.Is there somewhere any source code example for that ? anyone facing the same problem ?I can share some code that tries to do playback from line in to headphone out if someone interested.RegardsFrancois  #stm32f769i-disco-audio-wm8994

[john doe]

Posted on April 05, 2017 at 01:36

when you say 'noisy' do you mean line noise? like static or something?

[john doe]

Posted on May 27, 2017 at 14:21

It actually sounds nice if you back off on the input signal strength. it is after all, line level in not speaker in.

[john doe]

Posted on May 28, 2017 at 23:33

Thank you

Beaulier.Francois

https://github.com/ProjectsByJRP/audio_pass-through

[James Anderson]

Posted on March 25, 2018 at 07:36

thanks a lot for posting this code john. did you run into issues with noise on the codec's line in? I get enough noise to make the board unusable for audio processing with the code you posted, and with ST's audio loopback demo (which may be new.) I tried powering the board from an external linear Psu as well. gonna have a look at the hefty datasheet of the WM8994 to see if I can reduce the noise by changing some analog path settings or something.

[Adam L.]

I had a similar problem on my STM32F723E-disco board. Noise level on line-in input was unacceptable. Problem lied in wrong connection between PC and board. Supplying power from phone charger solved this issue. More can be found here: https://forum.cockos.com/showthread.php?t=113721

[Lpria.1]

its very great example... thank.. but i want 8K audio frequency & it not working... it working just >= 16K audio frequency... can u tell me why? because i want slow speed DSP audio

[PR.6]

I am also facing same problem to get analog audio signal from line in jack at stm32f769i discovery board.

If you have this code,Please share whole working zipped project file.