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Readme.md

micro - USBasp

This is a work in progress.

  • Port of USBasp to ATtiny 85
  • Design of optimized hardware

Why?

  • It's fun.
  • USBasp is a de-facto standard for small USB-AVR programmers. It's the only one to support TPI.
  • Porting it to ATtiny85 allows for a smaller and cheaper circuit. Cheaper MCU, no Xtal, etc...

This software is based on Thomas Fischl's USBasp. See readme.txt for original comments.

Status

Software:

  • USBasp sucessfully compiles for the ATTiny85.
  • micronucleus works as a bootloader.
  • USB device is recognized as USBasp and communicates with AVRdude.
  • Software tested on microUSB hardware. Both TPI and SPI seem to work.

Hardware:

  • Revision 0.5 sent to OSH park for pcb manufacturing.
  • Update v1.1 done, ready for manufacturing.
  • Update 02/08/2013: All parts received, first device built.

Hardware

Circuit:
Circuit

v1.1 PCB front side:
V1.1 PCB front

v1.1 PCB rear side:
V1.1 PCB rear

About

USBasp for ATtiny85

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