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Monday, 13. November 2006
Programming Tiny15 via Arduino
rsbohn
16:01h
When I plugged my Olimex 8pin AVR dev board into my Arduino I could read the device signatures just fine (after fixing one timing bug). But when I tried to write a program to the Tiny15 chip things got strange fast. Especially when I got the byte order wrong (started writing MSB into LSB - another bug). After that no matter how much I wrote the first few bytes of the program were always zero. No fun! So I added a 'chip reset' to my programming software. This flips all the bits in the flash ON, after that it would take my program. Guess you can only turn the bits off when you program the flash. For the Tiny15 program I wrote the code in Astudio4, then manually assembled it with -l tiny.lst. Then I openened tiny.lst and copied the machine codes into my programmer C code. The code would use the array to send individual bytes to the Tiny15 using SPI. OK, this is not a great way to do it, but it let me learn how the Tiny15 unit works. I was disappointed that you could only set the bits OFF unless you reset the whole chip. That makes iterative development more difficult. I'm working on a 'way old school' programmer, which will allow you to enter the program 8 bits at a time (using 8 switches). The plan now is to capture the whole software image (or at least 256 words of it) in memory on the Arduino's ATMega8 chip, then erase and write it to the Tiny15 etc. I will also be able to read the Tiny15 program into the Mega8, edit it there, then push it back out to the Tiny15. More about the WOS programmer in my next post...
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7925 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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