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Wednesday, 2. January 2008
And now, AVRISP-duino
rsbohn
13:52h
I made and published code to turn the Arduino into an AVR910 ISP programmer. Sadly, avrdude won't program fuses on the '910. So I'm working on some AVRISP (version 1) software. Getting the fuses working was the easy part. Avrdude uses the Universal command for that, so it is essentially just passing the commands from avrdude right to the SPI port. Once I set my /RESET line as output it worked like a charm. But I can't have two arduino based programmers that don't do the whole job. Took some work but I now have writing to the flash working also. I've only tried it on the Tiny2313 chip, so some of my assumptions might not hold for other chips. I want to get it working with AVRStudio also, so that will take some more work. Now that I can program fuses I can set the Tiny2313 to run at 8MHz instead of the default 1MHz. Sometimes that's useful. I can also set it to use an external crystal or resonator, which opens up a wide range of frequencies. I like working on projects like this. The constraints help me focus (it has to work with avrdude for example). The protocol is documented, so part of it is just implementing the protocol. And I wind up with a tool I can use on future projects. I have a project on Google Code for Mega8 based ISP software. I'll post this one after I get it cleaned up a bit.
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8140 days of detection
mod: 12/3/08, 5:42 AM days of detection... PMOG owner
BiographyRandall Bohn lives in Orem, Utah, USA. He works as a Software Quality Engineer. He is a big fan of the AVR line of microcontrollers. He has been in the computer industry since 1989. Randall is married and has three children. rsbohn can be reached via gmail.com. status
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