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USBasp firmware working with a clone "USB ISP Version 2.0" (marked "MX-USBISP-V4.00" or "MX-USBISP-V5.00" on the PCB)
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README.md

USBasp on a clone

This is a fork of the original USBasp firmware (the file from 2011-05-28) tweaked to work with clone "USB ISP Version 2.0" devices (marked "MX-USBISP-V4.00" on the PCB). The original documentation and license is in Readme.txt.

Update: as reported by erokui devices marked with "MX-USBISP-V5.00" seem to work as well.

What is USB ISP?

This is a very cheap programmer for AVR-based microcontrollers available from many Chinese suppliers. Hardware-wise it appears to be very similar to USBasp, but out of the box it works only with a Windows GUI utility from the manufacturer and does not work with avrdude.

Here is how it looks:

USBISP Assembled

With the aluminium shell removed:

USBISP PCB Front

There is a "MX-USBISP-V4.00" label on the back of the PCB, see the photo below. If you have "V3.00" device, then better check this post instead.

Quick Start

  1. Remove the aluminium shell and put the device into the "self-programming" mode by connecting two pads on the back of the PCB marked with "UP":

    USBISP PCB Back

  2. Connect your favorite programmer to the header of USB ISP referring to the pinout on the case of the device. If you don't have one around, then use an Arduino with ArduinoISP example running on it. It is supported by avrdude as avrisp. Be sure to set baud rate to 19200.

  3. Upload the prebuilt firmware in ./firmware/main.hex and set the fuses to HFUSE=0xDD and LFUSE=0xFF.

  4. Disable self-programming jumper.

Now connect the USB ISP to your computer. You should see the LED turning red for a bit and then turning blue. A USBasp HID device should appear in your USB tree. (Go to System Information > USB on a Mac.) Note that the device won't appear as a serial port, this is normal.

Now you can check if avrdude can talk to it:

 avrdude -c usbasp -P usb -p m328p

If you don't have anything connected to the programmer, then you'll see it complaining:

$ avrdude -c usbasp  -P usb -p m328p

avrdude: error: program enable: target doesn't answer. 1 
avrdude: initialization failed, rc=-1

But you should not get any USB-related errors.

Now connect it to a device to be programmed and read the flash first. If it works, then try writing something.

Building from Sources

If you have avr-gcc toolchain installed, then navigate to ./firmware and run:

make main.hex

After this succeeds adjust the Makefile to suit your programmer and then do:

make flash && make fuses

Good luck!


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