Bluetooth Scan finds nothing?

[Joao_Manoel]

I managed to make it . I’m still testing with my image, the thing is just increasing the baudrate.

@Joao_Manoel

The thing was that after all the learning about how everything was working and the BT<->SOC connection, I was convinced that there is no hardware limitation to have higher baudrates and make sound over BT possible. I managed to use a kernel driver to upload the BT firmware to the chip which is better than using the utility brcm_patchram_plus we have actually. The only thing that was bothering me was that I couldn’t increase the baudrate no matter what I tried: new brcm_patchram_plus compiled, original, hciattach utility, kernel driver, different UART configuration new kernel patches to change clock speeds …

I finally found (trial and error) that our BT chip works only with 3 different baudrates: 115200 bps, 500000 bps, and 1.5 Mbps. The 115200 bps is the default and it is what we have normally. 115200 bps is not enough for smooth audio over BT (the audio is stuttering), but 500000 bps, and 1.5 Mbps are enough. I’m actually testing 1.5 Mbps with audio and it is working perfectly. I had problems getting a stable connection when trying brcm_patchram_plus and 1.5 Mbps, but using the kernel driver seems to be working fine.