Adafruit feather 32u4 Bluetooth support not working.

[harshitgoel96]

A few months ago I used QMK on Adafruit feather 32u4 and was able to get complete functional bluetooth keyboard working. Last night after reflashing the code, the Bluetooth output only works till USB is connected to the feather. When I remove the usb it does not work over bluetooth at all.

The feather is connecting to mobile, but there is no bt output unless usb is connected. I have tried OUT_BT and OUT_AUTO, but nothing seems to be working.

[drashna]

This may be related to: #4131

But I'm not entirely sure about that.

Do you know if there is a version that does work correctly?

[harshitgoel96]

the last time I built the firmware, with working Bluetooth was when I posted issue #2229. at that time OUT_AUTO was working but it war required to be pressed manually. But I did not test it further.

[drashna]

Just thinking about it, this change may be why: #3951

Unfortunately, I don't have a BT controller to test out, ATM... so I can't test this out myself.... but if you could figure out what change caused this specifically, it would be awesome, and help us to fix the issue.

[harshitgoel96]

@drashna I don't have skills to do it. I don't have much knowledge about embedded systems :(

[deltapoot]

Can you downgrade the firmware on the adafruit feather to make this to work?

[harshitgoel96]

@deltapoot I dont think the issue is with Adafriut Firmware itself, but with QMK. I do not know which version of qmk is going to work either.

[deltapoot]

I see, I understand now. Thank you.

[fcoury]

Just to add to the conversation, I have reverted to commit

46cf8cc

Which is the parent of:

39bd760

Which is the commit resulting from the mentioned PR and I still have the same issue described here.

[fcoury]

OK, after a ton of investigation I have made it work with the following code changes:

• Setting the keyboard to use OUTPUT_USB by default
• Removing bluetooth initialization using adafruit_ble_task() from lufa.c's main() function and moving it to be called lazily when the output is toggled to Bluetooth on quantum.c
• Removing buffered output of keystrokes (via RingBuffer), sending it directly instead

And then following this procedure:

1. Connect to keyboard via bluetooth
2. Change output to Bluetooth via OUT_BT keypress

I will continue this investigation and will report back when I know more.

[marhalloweenvt]

Hey @fcoury,
Can i use your qmk_firmware branch fcoury/fix/adafruit_ble to compile a bluetooth fw for Adafruit feather 32u4? I am doing a handwired keyboard with it.

[harshitgoel96]

paging @wez who originally wrote the code for feather.

Hi Wez, there seems to be some bug introduced in feather's bluetooth capabilities. Can you please help us out ?