Borisbritwa Posted December 19, 2016 Posted December 19, 2016 (jessie 3.4.112-sun8i) How to use debug TTL UART(three pins next to the power jack )?
martinayotte Posted December 19, 2016 Posted December 19, 2016 if you do "cat /proc/cmdline", you will probably see that serial debug is attached as /dev/ttyS0.
Borisbritwa Posted December 19, 2016 Author Posted December 19, 2016 if you do "cat /proc/cmdline", you will probably see that serial debug is attached as /dev/ttyS0. Yes you are right (as I understand it is configured). Now how can I use it using C language or Python. cat /dev/ttyS0|tee my-data Will it work?
martinayotte Posted December 19, 2016 Posted December 19, 2016 What do you mean ? Do you wish to send something from your C or Python application to this serial output ? Or you wish to see the debug output from the kernel without using a USB-Serial dongle ? For the first case, simply use normal open()/read()/write()/close() APIs, for Python, you need to install python-serial. For the second case, no need to talk to serial, simply look at dmesg and/or /var/log/syslog.
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