Arduino Gemma bootloader on Digispark?

[praveen_khm]

Hi,

I have a digispark board designed and was using for all my experiments till now. Now that Arduino has released a version of Gemma without adafruit VID/PID, was wondering if that works on Digispark boards. The schematic seems to be the same for both of them.

I did a quick test, but the bootloader does not work. It says "USB not recognized". Step by Step process I followed:

1. Download firmware from Arduino github library
2. Use USBasp to upload the firmware with configuration: Clock: 8MHz & 16MHz (tried both), low_fuses=0xF1, high_fuses=0xD5, extended_fuses=0xFE.
3. Uploaded the firmware and connected via USB cable.

Waits for driver install and once installed, it says "Unknown device". Anyone has a clue what might be wrong?

BTW, Digispark firmware works awesome and everything works as expected.

[praveen_khm]

Anybody to help on this please?

[praveen_khm]

Hi,

Thanks for the response. Just to clear my confusion, have you used adafruit Gemma bootloader or the arduino one, though you have mentioned that it is arduino Gemma.

Since Gemma board does not require any conf. file change, why is it for digispark since the design is still the same.

Thanks,
Praveen

[praveen_khm]

Thanks for the answer. I really missed this line "By choosing the "Arduino Gemma" programmer," and had kept the USBasp programmer selection active. After reading your post atleast 3 times, I got it right.

Well, it is working as expected and am able to upload sketch into gemma. On Arduino 1.6.6 there is only Arduino Gemma and no Gemma (8 MHz) or Gemma USB (12 MHz) on windows machine. Not sure if that is unique to *nix environments. Thanks again...