Silent Microphone over Bluetooth HFP (AUD-1198)

[miakizz]

Hi!
I'm currently trying to use the HFP example code here: https://github.com/espressif/esp-adf/tree/master/examples/get-started/pipeline_a2dp_sink_and_hfp. The module can sink A2DP and HFP audio and play it, but when a call is active the microphone is completely silent. This message is also constantly printing in the console whenever HFP is active:

W (1279166) BT_BTM: SCO xmit Q overflow, pkt dropped
W (1279166) BT_BTM: stat 10
W (1279186) BT_BTM: SCO xmit Q overflow, pkt dropped
W (1279186) BT_BTM: stat 10
W (1279206) BT_BTM: SCO xmit Q overflow, pkt dropped
W (1279206) BT_BTM: stat 10

A similar issue was encountered here: espressif/esp-idf#3550, however increasing BTM_SCO_DATA_SIZE_MAX just increases the time between the messages, suggesting that no data is being sent and the queue is filling up regardless of the size. The message is from this file: https://github.com/espressif/esp-idf/blob/9dbb7526c5d140b22529a1cfb0b4b46a0ab288aa/components/bt/host/bluedroid/stack/btm/btm_sco.c#L447 and increasing BTM_SCO_XMIT_QUEUE_THRS also doesn't fix the issue. I'm using the ESP32-LyraT-Mini_V1.2 and the latest ADF version.

Thanks!

[esp-xiaodong]

@nkizz
Please use this file for mini board, and test again.

a2dp_sink_and_hfp_example.txt

[miakizz]

The new code worked! I had to comment out periph_bt_play(bt_periph); since that function wasn't defined, but one I did that, the mic worked perfectly. The message about the queue overflow still prints to the console every 20 ms, so I commented out that print statement because it was causing the audio to cut out.

[rahna803]

Hello,

I am facing the same problem but for LyraT 4.3 board. Is it possible to a working code?

[pooyasa]

Hello,

I am facing the same problem but for LyraT 4.3 board. Is it possible to a working code?

I fixed it by enabling the on board SPI RAM from Component Config > ESP32-specific > Support for external, SPI-Connected ram.