![]() To get the Raspi and AVR talking to each other safely, built a small circuit from a 74244 buffer and a FET. Sometimes, though, the logic of the AVR and Raspi would be at different levels, so while bitbanging may work in a pinch it’s not something anyone should use regularly. ![]() The AVR ISP interface looks a lot like an SPI interface, and the easiest way to program an AVR with a Raspi would be to bitbang all the commands from the GPIO pins. It’s a safe way of programming an AVR via the Raspi’s GPIO pins that uses an extremely minimal circuit. ![]() AVR programmers can be bought for just a few dollars on the Internet, but if you’re building an expansion board with an AVR for your Raspi, this is the build for you.
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