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Altera_Forum
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20 years ago

cal_uart(with fifo) + NIOSserial.c

As we know, we need uart with fifo to enchance the performance. So we got the cal_uart from Altera, which should tested by ourselves because it is not provided officially by altera. Now we use...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Some more details :

I made some new tests with the cal_uart.

I don't get any more uClinux crash (don't know why...), but I still get the poor performances of altera_avalon_uart.

When I just do a "cat /dev/ttyS0 > /tmp/file &" (/tmp/file is on a ramfs), and that I send lots of characters (10k) from my computer, and that I read the size of /tmp/file, I can see it is not the right size, and that the size is different evrytime I try this. This is exactly what I had with the altera_avalon_uart, except that now I don't receive the "ttyS0 : xx characters overrun".

It seems to be normal because we don't take advantage of the FIFO.

Could you tell me how to change this ?

Thanks a lot,

Pierre-Olivier