How to use audio in full duplex?

Legato Application Framework
1

Hi, I’m trying to play and record in a voice call with FX30 (WP76XX) with R16. I can play file on modem TX, record modem RX but not simultaneously.

I’ve the same behavior using the AT commands:

Record ok:
atdXXX ;
OK
CONNECT
AT!AVAUDIO=4,1,/tmp/recording1.wav
OK
AT!AVAUDIO=4,0
OK

Play ok:
atdXXX ;
OK
CONNECT
AT!AVAUDIO =3,1,/home/root/0-to-9_8k.wav
OK
AT!AVAUDIO=3,0
OK

Try both for full duplex:
atdXXX ;
OK
CONNECT
AT!AVAUDIO =3,1,/home/root/0-to-9_8k.wav
OK
AT!AVAUDIO=4,1,/tmp/recording1.wav
ERROR
If I stop file playing, then record is possible
AT!AVAUDIO=3,0
OK
AT!AVAUDIO=4,1,/tmp/recording1.wav
OK
AT!AVAUDIO=4,0
OK

The audio API documentation says that playing and recording is possible simultaneously. So I don’t know what I’m doing wrong.

Thank you in advance

2

How about using AT command and legato audio app together?

3

Hello, thank you for your answer.
Actually, I only want to use audio through the API. As I couldn’t do full duplex with API, I tried with AT commands (my app stopped) to check if full duplex was available …
This is the test I’ve described in my previous post.
Unfortunately, I never succeed doing full duplex, neither using API, nor using AT command.

4

How about one uses AT command, another one uses legato API?

5

Thank you, I’ve made the test you’ve suggested: it’s working fine.
I can record with my app while playing with the AT commands.

I don’t undestand why.

I will try with 2 app: one for playing and one for recording and then with 2 threads in the same app.