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Altera_Forum
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20 years ago

uC/OS-II friendly UART communication

Hi, I'm trying to set up a few communication links using UART. One is at 115.2kbps and the others are at 9600bps. One is obviously going to be used quite a bit and the others not so much....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Hello all,

Thanks for responding.

DMA transfers would have worked but our protocol requires two bytes for the end-of-packet so this wasn't viable as the EOP register only allows for one byte.

The solution that I settled on was using open() with O_NONBLOCK for non-blocking mode. The UART is being polled one character at a time and stored in a buffer. When the end bytes are found or a timeout occurs then the packet is dealt with.

I've started to re-write the UART drivers so I can completely toss the one's supplied by Altera. I've found some problems with it and small tests so far show I can shave 30K off the final executable by getting rid of the included drivers and a couple of other things that aren't being used.

Thanks,

Philip