V-USB fails to enumerate

[marshallverbsky]

Hiya, very inspiring work!! I started recreating but I wanted to use a spare Arduino Nano I had lying around since it uses the ATMega328p. When I burn the USBaspLoader using an Uno, it says everything uploaded and verified properly. Then when I plug it in (Linux) it says the device didn't respond to the setup address and failed to enumerate. It successfully identifies it as a low-speed USB device, but doesn't go past that.

All wiring has been triple-checked. I set the bootloader to always open to avoid any trickiness with the RESET/BOOT jumper sequence. I'm also using the Nano's external 16mHz xtal and RESET button.

I'll attach a screenshot of my adapted schematic. Anything obvious I'm missing?

I DO know I was missing the pullup on RESET, and I've since put that in without any changes.

[brickbots]

Hello @marshallverbsky and thanks for reaching out! After you flash the boot loader, you'll still need to install some sort of keyboard software, like QMK, and set up your keymap and layouts. If you don't do this second step, the device will not enumerate as a keyboard, just a generic USB device.

Let me know if this helps!

[marshallverbsky]

Hey thanks for the reply! What I'm stuck at is after USBaspLoader is burned, I theoretically plug into a computer and the Nano is recognized as a USBasp device so that I can then flash the QMK firmware. That's where it's just not being recognized currently.

I've been burning USBaspLoader via an Uno running ArduinoISP connected to the Nano's ICSP header. Are you saying I could flash QMK this way too?

Thanks for your insight. I'm thinking this could be more of a USBaspLoader/V-USB problem that I can bring up elsewhere--I just wanted to get your thoughts because you're more familiar with this exact use-case. I can give some more detailed info/logs when I'm at my computer this evening. :)