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Altera_Forum's avatar
Altera_Forum
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19 years ago

Loosing chars with avalon_uart

I need to use a serial line under eCos, this one being an avalon UART whose speed is fixed to 115200 bps. Design clock is 25 MHz, giving an error < 0.01 %. When I read chars without eCos (RTOS = n...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

I think the ecos uart driver handles the actual buffer management in a DSR, this will be too slow for 115200. It would work if the altera uart had a 16 byte fifo or something. I had to use my own uart driver with ecos. The rx register is immediately read in the ISR.

Can anyone offer a free uart with fifo, possibly an SOPC-Builder version of the Opencores uart?