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Altera_Forum's avatar
Altera_Forum
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15 years ago

Can not read from "dev/ttyS0"

Hi all, I have ported uClinux onto an DE2 2C35 board and i want to communicate with my PC using the RS232 port. I can open and write data to "dev/ttyS0" well. But I can't read from "dev/ttyS0" ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

1. print errno. It will say what happening.

2. Show

ls -l /dev/ttyS0

Maybe you have no ttyS0 or you have not permission.