HFP_AG with BLE or UART (IDFGH-16854)

[FarukISIKER-Conrad]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

V5.5.1

Espressif SoC revision.

ESP32 chip revision: v3.1

Operating System used.

Windows

How did you build your project?

VS Code IDE

If you are using Windows, please specify command line type.

PowerShell

Development Kit.

ESP32-Wroom-32D

Power Supply used.

USB

What is the expected behavior?

Running both peripheral with clean sound over HFP mSBC.

What is the actual behavior?

I see regular spikes inside sound when I run other tasks. Especially with ble coex, when I send notification, more spikes are generated.
When I change sound frequency with ISR of a button, it runs without problem. But when I change over uart or running ble task, I recognize spikes inside sound.

Steps to reproduce.

1. Step : Use HFP_AG example with HCI configuration. And generate sine wave frames by using math library.
2. Step : Activate UART to change frequency of outgoing sound. It can be ran on CPU APP or CPU PRO. Read rx line with 10 ms interval.
3. Step : Enable BLE with dual bluetooth mode. Update a notification with 50 ms interval.

Debug Logs.

I (14828) BT_APP_HF: speed(11.342931s ~ 14.347360s): 251.788269 kbit/s<CR><LF><CR><LF>I (17838) BT_APP_HF: speed(14.347360s ~ 17.355049s): 255.983902 kbit/s<CR><LF><CR><LF>W (19028) BT_HCI: hci cmd send: sniff: hdl 0x80, intv(50 150)<CR><LF>W (19028) BT_HCI: hcif mode change: hdl 0x80, mode 0, intv 0, status 0x24<CR><LF>E (19028) BT_APPL: bta_dm_pm_btm_status hci_status=36<CR><LF><CR><LF>I (20848) BT_APP_HF: speed(17.355049s ~ 20.362842s): 255.975067 kbit/s<CR><LF><CR><LF>I (23848) BT_APP_HF: speed(20.362842s ~ 23.370780s): 255.962738 kbit/s<CR><LF><CR><LF>I (26858) BT_APP_HF: speed(23.370780s ~ 26.377359s): 256.078430 kbit/s<CR><LF><CR><LF>I (29858) BT_APP_HF: speed(26.377359s ~ 29.377381s): 255.998123 kbit/s<CR><LF><CR><LF>I (32868) BT_APP_HF: speed(29.377381s ~ 32.384925s): 255.996246 kbit/s<CR><LF><CR><LF>����������������������������������������������������������������4925s ~ 35.384931s): 255.999481 kbit/s<CR><LF>I (36268) BT_BLE_COEX_TAG: Create ble_gatts_notify_task<CR><LF><CR><LF>I (38868) BT_APP_HF: speed(35.384931s ~ 38.385048s): 255.990021 kbit/s<CR><LF><CR><LF>I (41868) BT_APP_HF: speed(38.385048s ~ 41.385048s): 256.000000 kbit/s<CR><LF><CR><LF>

Diagnostic report archive.

No response

More Information.

No response

[FarukISIKER-Conrad]

Are any engineer assigned to this?

[BetterJincheng]

@FarukISIKER-Conrad Sorry for the late reply. I will start looking into your issue shortly.

[FarukISIKER-Conrad]

If we can solve that noise problem, that makes us to use from this module thousands

[FarukISIKER-Conrad]

@BetterJincheng do you have any comment upon this time?

[BetterJincheng]

@FarukISIKER-Conrad Could you provide a minimal example that reproduces the issue? That way, we can resolve the problem as quickly as possible.

[FarukISIKER-Conrad]

@BetterJincheng I invited you to my example repo. You can refer to "uart_no_spike" branch for trying ble, uart and hfp_ag.
You need to connect a button to GPIO_NUM_25 as pulled it up, GPIO_NUM_22 and GPIO_NUM_23 are for UART_NUM_1.

Button is for enabling-disabling voice.

You can send some commands over uart for hfp connection, sucs as;
"con" -> connect to device
"cona" -> connect to audio
"frequ 100" -> Update sine wave frequency from 100 to 1000

[BetterJincheng]

@FarukISIKER-Conrad OK I will try now.

[FarukISIKER-Conrad]

@BetterJincheng Did you accept my invitation for repo?

[FarukISIKER-Conrad]

@BetterJincheng By theway when I use A2DP protocol, the sound is clean no distortion. However, latency becomes 4 times more so that I don't prefer it.