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You know this should be really easy to find but for some reason I am having no luck. First off, I'm a C programmer and I am really bad at reading Assembler code. I know there is a way to write a software UART for the 8051. I am using a Phillips P89C668 right now and I will be changing it to another soon. If someone could point me to some sample code how to setup a half-duplex UART I would really appreciate it. I have two pins and I am going to use one as tx and the other as rx. I don't think I need to do a full duplex but if there is something out there that does it I'll take it at this point! Thanks. -stv
I agree.. It was easy to do it and i did actually write it in C. However, like stated very early by Erik, there were a few (not too many) timing issues that I didn't want to keep coding around so I just mixed in assembler in my C. Ok.. So this is now figured out. Be a good thread for some C coder to read someday! :) Thanks to all.
Sounds like you finished it already.....but as a review you may want to check out the software UART App Note at Silicon Laboratories (formerally Cygnal) at http://www.silabs.com/products/pdf/an115rev1_1.pdf . Its in C !! Michael Karas