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Operating Systems Linux Debian Reading data from a serial port Post 302920063 by wisecracker on Tuesday 7th of October 2014 02:56:39 AM
Old 10-07-2014
What do you mean how?

If the value being read from the serial port is 0, (zero), then the cursor will not move.
Until the value changes from 33 to 126 you will not see anything printed but the cursor __might__ move by one space.

What is connected to the serial port, /dev/ttyS0?
Does it allow raw transfer? (e.g. Arduino.)

If nothing is connected then obtain a loopback plug as a test piece and plug it into the port.

Once set up and with a loopback plug connected use this untested line:-
Code:
printf "Some text to display" > /dev/ttyS0

 

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TTYS(4)                                                      Linux Programmer's Manual                                                     TTYS(4)

NAME
ttyS - serial terminal lines DESCRIPTION
ttyS[0-3] are character devices for the serial terminal lines. They are typically created by: mknod -m 660 /dev/ttyS0 c 4 64 # base address 0x3f8 mknod -m 660 /dev/ttyS1 c 4 65 # base address 0x2f8 mknod -m 660 /dev/ttyS2 c 4 66 # base address 0x3e8 mknod -m 660 /dev/ttyS3 c 4 67 # base address 0x2e8 chown root:tty /dev/ttyS[0-3] FILES
/dev/ttyS[0-3] SEE ALSO
chown(1), mknod(1), tty(4), agetty(8), mingetty(8), setserial(8) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 1992-12-19 TTYS(4)
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