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To follow up on the thread a few weeks ago about polled vs. interrupt UART operation I've written one up this week and have posted it at: http://www.embeddedfw.com Yes it's my site but you get a free UART driver to play with. It's fully self contained in one C file with very few external definitions required in the accompanying .h file. I'd be interested to hear if anyone tries it, if they like it, if they find bugs. I've only done some minimal testing using D-Scope. Thanks and enjoy. What driver next? - Mark