BT1058 Source Mode — Analog audio not routing during HFP calls

anthonysg

I'm using BT1058 (V2.0.5, 20260128) in Source mode as HFP-AG, connecting to a Bluetooth headset. Looking for help understanding the correct configuration for HFP audio over analog pins.

Current configuration:
AT+MODCFG=1 (Source mode)
AT+AUXCFG=1 (analog audio input)
AT+HFPWBS=0 (narrowband)
AT+I2SCFG=0 (I2S disabled)
AT+PROFILE=655699 (default, unchanged)

What works:
A2DP audio streams correctly — audio input on MIC_LP/MIC_RP reaches the connected headset speaker.
What doesn't work:
During an HFP call (+HFPSTAT=6, +HFPAUDIO=1 event received), audio from MIC_LP/MIC_RP does not reach the remote party. Audio out is also not working.

My question:
Is there an additional command or configuration step required to route SCO audio through the analog pins during HFP calls? Or should it work automatically with AUXCFG=1? I'm trying to work out if I'm doing something wrong, or if what I'm expecting isn't supported.

Any guidance from others who have successfully used analog audio with HFP-AG mode would be much appreciated. Thanks in advance.
Anthony

FAE_Gavin

anthonysg After checking with our engineer: HFP two‑way audio is only supported when the audio input source is USB.

With AT+AUXCFG=1 (analog input):
A2DP works (audio to headset speaker)

HFP call audio (SCO) does not work – neither uplink nor downlink.

If you need HFP over analog pins, custom firmware is required. Please contact sales for evaluation.

anthonysg

Many thanks for the reply, that's all clear. I have two follow-on questions/clarifications:

To confirm, is I2S audio available for HFP (either in or out), or not supported at all?
Are there any Feasycom modules with firmware which supports HFP-AG and two-way audio over analog pins?

For the USB approach: when HFP two-way audio is routed via USB, does the BT1058 enumerate as a USB Audio Class 1.0 device? Will it work with standard UAC drivers (Linux ALSA / Windows built-in)?

Thanks in advance,
Anthony

FAE_Gavin

anthonysg Thank you for your follow-up.
1.I2S support for HFP
In the standard firmware of FSC-BT1058, the HFP audio path currently supports input only,I2S output is not supported for HFP. This may be optimized in future firmware updates.

2.Module recommendation
To receive the most suitable module recommendation based on your specific application scenario (e.g., HFP-AG role, audio input type, call quality requirements), please contact our sales team at sales01@feasycom.com. They will evaluate your project needs and suggest the best module – including custom firmware options if necessary.

3.USB audio routing
When USB is used for HFP audio, the BT1058 enumerates as a standard USB Audio Class 1.0 device. It is compatible with generic UAC drivers, including Linux ALSA and Windows built‑in drivers – no additional driver installation is required.

anthonysg

Many thanks for the reply. I have contacted the sales team as suggested and will explore other options for my use case in the meantime.
Thanks
Anthony