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Tuesday, 21. March 2006
Arduino as Programmer
rsbohn
15:43h
I'm working on using the Arduino board as a programmer for my ATtiny15L chips. The base idea is to send the 15L program to the Arduino board (usb!) and then the Arduino sends the program to the chip using SPI. The wiring is real easy. I use pin 7 for MOSI, 6 for MISO, and 5 for clock. I put the 15L in the wireless breadboard. I'm also taking 5V and ground from the Arduino also. The software's the tricky part here. My first attempt just runs a 1Hz signal on SCK (clock, pin 5) to an LED on the wireless breadboard. That's working, so I start sending the 'program enable' bytes on MOSI. A second LED shows that this signal is working. Program enable is 4 bytes, with one byte back during byte 3. So I echo the return byte back up the USB. $A6 is wrong, so I send more debug info up the USB. I'm getting an extra bit somewhere, so I deal with that and get the proper value, $53. The next step is to check the signature bytes on the tiny15L. It should be $1E $09 $06, but I'm getting $1E $10 $06. Not sure why. Have to sort it out next time. Eventually I will upload the tiny15 code to a buffer on the Arduino, then a command from the computer starts the upload to the tiny15. Stay tuned! ... Link |
8144 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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