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KivApple / dell-charger-emulator

Emulator of original Dell charger using ATTINY85
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Possibility of using "arduino as ISP" to program attiny85 instead of 1wire? #3

Closed crabdancing closed 5 years ago

crabdancing commented 6 years ago

My current preferred setup for attiny programming consists of a board with an arduino programmed to function as a ISP, with a couple of additional components to prevent it from resetting to bootloader. The relevant wiring is essentially this. This is a very popular type of programmer I think, since a lot of people have and know where to get arduinos.

How would I use this project with my setup to program my attiny85?

hetii commented 5 years ago

@alxpettit You can just compile this project by using its makefile and grab hex file to use with your arduino like programmer. You can also change makefile and edit programmer type to match your programmer.

crabdancing commented 5 years ago

Wow, this has been sitting here a long time!

For anyone curious, here's what I did to push the hex via my fake arduino board to an attiny85: avrdude -c arduino -P /dev/ttyUSB0 -p attiny85 -U flash:w:dell-charger-emulator.hex -b 19200

It took a bit of poking around for me to figure out how to do this. Eventually I realized the easiest thing to do was simply try flashing via Arduino as ISP in the Arduino IDE, and see what options were sent. Turns out -b 19200 was a prereq.

For anyone unfamiliar with avrdude: -c arduino sets the programmer to Arduino as ISP, -P sets the port to the port of the arduino, and -p sets the AVR chip to compile for. -U is for operation.

Of course, you're going to have to do the eeprom operation too: avrdude -c arduino -P /dev/ttyUSB0 -b19200 -p attiny85 -U eeprom:w:eeprom-data.hex

It's a lot easier if you just do: AVRDUDE_FLAGS?=-c arduino -P /dev/ttyUSB0 -b19200 in the Makefile.