is31io7326_clone

Functional clone of the IS31IO7326 using an ATtiny48.

Key reporting and rollover detection are tested and working, all options in the configuration register are saved but do not yet influence behaviour.

Getting started:

1. Install an avr toolchain (if you're on OS X, use brew to install avr-libc from osx-cross).
2. cd firmware
3. make
4. make flash and make fuse as necessary to program your MCU (you'll need avrdude for this, brew has it)

Common issues:

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avrdude: no programmer has been specified on the command line or the config file

avrdude needs to know what kind of programmer you're using. You can uncomment/edit one of the PROGRAMMER lines in firmware/Makefile, or add a default_programmer directive to your ~/.avrduderc.

For more information, check out firmware/Makefile.

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avrdude: AVR Part "attiny48" not found.

avrdude can't find a part config for the attiny48. You can resolve this by appending doc/attiny48.avrduderc to ~/.avrduderc:

cat doc/attiny48.avrduderc >> ~/.avrduderc

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Porting to different hardware

It's possible to configure this project for different AVRs. Check out config/attiny48.h to get familiar with the required definitions and application considerations.