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Altera_Forum's avatar
Altera_Forum
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12 years ago

ISR driven UART is missing characters (even at 9600bps... same prob at 230400)

Any ideas on what I'm missing here that is causing me to miss characters? I'm interfacing to a device that shoots out RS232 packets (up to 200 per second if the bps can handle itI can select t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

I'm just starting with these tools, but that does make sense... it is behaving like a stall/flush. I was trying to get the baseline running before I started optimizations to add more features.

I'm wondering if I need to swap the processor to a Nios II/S and lower the amout of instruction cache... refilling that would slow ISR performance too, but the II/F runs really fast in a straight line... It takes about 30 minutes to Generate/Recompile and then I can run my timing tests, so I need to implement some other things and then I can come back to this one and optimize it.