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send TTL via the parallel port under Linux

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Leila Azizi
Leila Azizi on 16 Jan 2023
Answered: Atharva on 29 Mar 2023
Hello,
I am trying to send the TTLs via the parallel port under Linux.
I tested ppdev-mex from https://github.com/widmann/ppdev-mex. Here is my code:
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ppdev_mex('Open', 1);
lptwrite(1, 255)
ppdev_mex('Close', 1) ;
The problem is that I don't get an error, but nothing happens. In Python, I can send the trigger via the port:
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PORT1 = '/dev/parport1'
Do you have any idee?

Answers (1)

Atharva
Atharva on 29 Mar 2023
Hey Leila,
Here are some steps you can try to troubleshoot the issue-
  1. Check if the parallel port is detected by the system: Make sure that the parallel port is properly detected and configured by your Linux system.
  2. Check if the ppdev-mex library is installed correctly.
  3. Check if the ppdev kernel module is loaded.
  4. Check if the user has permissions to access the parallel port.

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