another bit-banged async serial Tx implementation

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Most of my bit-banged serial implementations have used a baud rate fixed at compile time.  I'm working on a project which requires transmitting at a baud rate that will be determined at runtime, so I modified some old code I wrote.  On an 8MHz AVR, it supports baud rates as low as 150bps, and as high as 57,600 with timing accuracy better than 1%.  115.2k has better than 3% timing accuracy right now, though I have a plan that would improve that to within 1%.

 

https://github.com/nerdralph/ner...

 

I have no special talents.  I am only passionately curious. - Albert Einstein