I recently ordered some USBasps from Amazon, which looked interesting, because unlike the typical USBasps, which are just bare PCBs, these had metal cases:
They are also common on AliExpress.
Unfortunately, when I plugged one into my computer, it detected as a USBHID device with VID=03EB and PID=C8B4, rather than as a USBasp. I tried overriding the USBHID driver on my Windows 10 machine, but that didn’t work.
Thankfully, after doing a bit of searching on the Internet, I found that others had encountered the same problem, and had found a solution. It seems that the firmware loaded into these things from the factory is proprietary, and require that you use the manufacturer’s janky software … it’s not AVRdude compatible!
Thankfully, the hardware is actually compatible w/ USBasp firmware with a minor tweak, and you just have to flash it with modified USBasp firmware.
I have a bunch of real USBasps, so I used a USBasp to convert the fakes into real USBasps! In order to program it, slide off the metal case. Next need to connect a jumper across the two holes labeled –> UP <–. The jumper enables programming of the onboard ATmega88V. Then plug it into your other USBasp or other ISP programmer, using the 10-pin ICSP cable:
So where do you get the special firmware? GreenPhotons has graciously compiled a modified firmware for us. Next use AVRdude to program the USBasp firmware into our target:
avrdude -cusbasp -pm88 -Uflash:w:20161227_mega88_usbasp.hex
You can use any ISP you already have, if you don’t have another USBasp. Just substitute the programmer in the -c parameter (e.g. -cusbtiny for a USBtiny). If you don’t have another ISP programmer, you can use an Arduino. This guy shows you how, as well as another way to get firmware.
If you get the following error, then your USBHID ISP has an ATmega88P instead of an ATmega88V
D:\hacking\arduino\USBasp\convert_usbhid>avrdude -cusbasp -pm88 -Uflash:w:20161227_mega88_usbasp.hex
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.02s
avrdude: Device signature = 0x1e930f
avrdude: Expected signature for ATMEGA88 is 1E 93 0A
Double check chip, or use -F to override this check.
Just substitute -pm88p for -pm88 in the avrdude command line:
avrdude -cusbasp -pm88p -Uflash:w:20161227_mega88_usbasp.hex
If you have an old copy of avdude that doesn’t like -pm88p, you can instead use -F to force avrdude to ignore the device signature:
avrdude -cusbasp -F -pm88 -Uflash:w:20161227_mega88_usbasp.hex
Downloads:
modified ATmega88 firmware for USBHID USBasp
References:
Making USBasp Chinese Clones Usable
I found this great resource after writing this article: