nRF5340 Audio DK: Walkie Talkie Demo - LINE IN instead of MIC

Question

Hello, 
 I am working with the Demo application for the Walkie Talkies using LE Audio. It works great with the onboard Microphone. I use only 2 boards. One is flashed as GATEWAY and the other is HEADSET (HS). 
 I now want to change the demo to get the audio input from the LINE IN socket instead of the Microphone. 
 What I tried I added the following to the prj.conf file as per recommendation from the SDK documents: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/nrf5340_audio/README.html#enabling-the-walkie-talkie-demo 
 CONFIG_AUDIO_SOURCE_I2S=y

But the audio still comes from the Microphone instead of the LINE IN input. 
 
 How can I change the demo to work from the LINE IN input instead of the microphone? 
 
 Thanks

fweinrebe · Accepted Answer

Hi Amanda, 
 Many thanks your reply was very helpful. Your post did not show up in my search because of the "_" in the name " WALKIE_TALKIE_DEMO ". 
 I did change it now so that the Walkie Talkie config is removed from the proj.conf file and I added: 
 
 CONFIG_STREAM_BIDIRECTIONAL=y 
 
 This one was already there: 
 CONFIG_AUDIO_SOURCE_I2S=y 
 
 The Line In on the Gateway is working now but the Headset side is still on PDM Mic 
 
 In the Headset side of the code I found the problem, the compiler directives are still enabling the MIC. 
 
 In .../ src/modules/hw_codec.c :

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

After code was changed to this on the Headset section, the Line In worked on both sides:

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

EDIT: Using NCS 2.2.0 but 2.3.0 was fixed already.

Regards 
 Fritz

nRF5340 Audio DK: Walkie Talkie Demo - LINE IN instead of MIC

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