Config for Unicast Client (Gateway) and Unicast Server (Headset) with Bidirectional Audio

Question

Hi, 
 I'm trying to set up two nRF5340 Audio boards - one as a unicast client (gateway) and the other as a unicast server (headset). I have seperate config files for both that essentially are the clones of the prj.conf file from the samples, but have small changes specific to each board. 
 I am trying to evaluate the walkie-talkie demo with the below params: 
 
 CONFIG_WALKIE_TALKIE_DEMO =y 
 
 CONFIG_AUDIO_SOURCE_I2S =y 
 
 Here i am using an external mic instead of the PDM onboard. But using this config, the board only transmits audio from Gateway to headset. I wanted to flip the direction of audio, from headset to gateway. How do i achieve it?

SNJY · Accepted Answer

My Mic is an external contact microphone (Analog). I wanted to use an external contact microphone instead of the pdm mic. 
 I am not sure but this might be a bug. The hw_codec.c file consists of configuration for the gateway to set the config according to pdm mic or line-in mic, but there was no config for the headset.

#if ((CONFIG_AUDIO_DEV == GATEWAY) && (CONFIG_AUDIO_SOURCE_I2S))
if (IS_ENABLED(CONFIG_WALKIE_TALKIE_DEMO)) {
ret = cs47l63_comm_reg_conf_write(pdm_mic_enable_configure,
ARRAY_SIZE(pdm_mic_enable_configure));
if (ret) {
return ret;
}
} else {
ret = cs47l63_comm_reg_conf_write(line_in_enable, ARRAY_SIZE(line_in_enable));
if (ret) {
return ret;
}
}
#endif /* ((CONFIG_AUDIO_DEV == GATEWAY) && (CONFIG_AUDIO_SOURCE_I2S)) */

#if ((CONFIG_AUDIO_DEV == HEADSET) && CONFIG_STREAM_BIDIRECTIONAL)

if (IS_ENABLED(CONFIG_WALKIE_TALKIE_DEMO)){
ret = cs47l63_comm_reg_conf_write(pdm_mic_enable_configure,
ARRAY_SIZE(pdm_mic_enable_configure));
if (ret){
return ret;
}
} else {
ret = cs47l63_comm_reg_conf_write(line_in_enable, ARRAY_SIZE(line_in_enable));
if (ret){
return ret;
}
}
#endif /* ((CONFIG_AUDIO_DEV == HEADSET) && CONFIG_STREAM_BIDIRECTIONAL) */

/* Toggle FLL to start up CS47L63 */
ret = cs47l63_comm_reg_conf_write(FLL_toggle, ARRAY_SIZE(FLL_toggle));
if (ret) {
return ret;
}

return 0;
}

The above block of code is what i have added instead in function hw_codec_default_conf_enable() in hw_codec.c.

Config for Unicast Client (Gateway) and Unicast Server (Headset) with Bidirectional Audio

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