send TTL via the parallel port under Linux

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?

Answer 1

[Atharva]

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.