https://github.com/cpldcpu/usbasp-t

USBasp for ATtiny85
https://github.com/cpldcpu/usbasp-t

Last synced: about 1 year ago
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USBasp for ATtiny85

• Host: GitHub
• URL: https://github.com/cpldcpu/usbasp-t
• Owner: cpldcpu
• Created: 2013-06-28T05:54:03.000Z (almost 13 years ago)
• Default Branch: master
• Last Pushed: 2022-05-23T18:15:18.000Z (about 4 years ago)
• Last Synced: 2025-03-26T10:05:11.662Z (about 1 year ago)
• Language: Assembly
• Homepage:
• Size: 484 KB
• Stars: 33
• Watchers: 7
• Forks: 16
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.md
  • Changelog: Changelog.txt

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README

          
## 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.

### Flashing

* Flash micronucleus

* Set the fuses as in thuis Makefile: HFUSE=0x5d, LFUSE=0xe1, EFUSE=0xfe

* Flash the firmware with micronucleus

### Hardware ###

Circuit:  

![Circuit](/hardware/u-usbasp-circuit.png)

v1.1 PCB front side:  

![V1.1 PCB front](/hardware/microusbasp_frontside.jpg)

v1.1 PCB rear side:   

![V1.1 PCB rear](/hardware/microusbasp_rearside.jpg)