I recently had the need to add RTS/CTS handshaking to the serial connection between my PC and my ATMega. I struggled with it for a time due to some misunderstandings on my part, and because I couldn’t find a writeup which described how the handshaking is supposed to work, and (more importantly for me) how it’s supposed to look. I eventually got it to work, and wrote it up in a way that would’ve been useful for me when I was trying to figure out how to make it work.
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