TDM slave library Topic is solved

[andreaalbano]

Hello everyone,
I'm working on the creation of TDM slave code, since it is not present.
Starting from the AN0162 (I2S loopback demo), i2s_slave_impl.h and tdm_master_impl.h I've created tdm_slave_impl.h.

The loop is working as a 4 channel TDM, but there are still some problems.
In attachment there are also the project and the lib_i2s.

I will work on this again and I will post the results, but is not an high priority task for me. If someone else is interested we could help each other.

Many thanks in advance,
Andrea

[akp]

Hi Andrea,

Thanks, I have need for this eventually. I will try to take a look sometime this week.

Cheers
Adam

[andreaalbano]

Hi Adam,
thank you.

After an answer on another post I found out that a new I2S/TDM library is in development (lib_i2s repo). The TDM slave is still not present, but the I2S slave have significant improvement.

So I've reimplemented the TDM from that source and this is the result:

tdm_slave_impl.h

It seems to work fine @2,4 and 8 channels, but, since my setup is made of a lot of flying cables, audio precision, oscilloscope etc, the clock signals are not so good and it often loose the sync. Now I need to wait that my hardware will be done and try it on it (hopefully next week).

I will update the post with results.

[andreaalbano]

I've corrected synchronization problem (both send and receive where 1 bit early).

Now it seems perfect.

tdm_slave_impl.h

Doesn't support offset != 0 and sync_len !=1 (values are ignored).