How to turn od LED

Hi everyone,
I've never had contact with Linux before, but I need to make a simple C program that lights up the LEDs with a delay of 0.5 seconds. After a few hours, I found nothing about it. I know the C language, but I don't know what environment to use in Linux and how to connect the HAL architecture in my project, which I can't understand. Thank you for your help and best regards.

M64 P0
G64 P0.5
M65 P0
will do that

Tomo  just to note, G4 is for time delay?

I also started 10 things and there is no end.. browsing the forum is an escape from obligations and interesting.. I always learn something:)

Sorry, I'm already explaining what I'm capable of.
I am using LinuxCNC on PC. The LEDs are to be turned on on the BECKHOFF EK1818 converter using the EtherCAT bus. This module is powered by a 24V DC power supply. Unfortunately, I don't know more details. That's the task I got.

tommylight wrote:

It is hard to help when you give us no viable info, but still,
What hardware?
What is the LED going to be driven?
If you are trying to use LinuxCNC on a PC with a parallel port, something like
M64 P0
G04 P0.5
M65 P0
will do that
 

Sorry, I'm already explaining what I'm capable of.
I am using LinuxCNC on PC. The LEDs are to be turned on on the BECKHOFF EK1818 converter using the EtherCAT bus. This module is powered by a 24V DC power supply. Unfortunately, I don't know more details. That's the task I got.

nobody knows anything?

We don't know what you have done yet...

-Did you already install the Etherlab master?
-Is Ethercat working by the commandline tools?
-Did you install linuxcnc-ethercat?
-Which Linux / Linuxcnc?
-for EK1818 you will have to create your own pdo configuration with the use of the "generic" slave.

As I am reading from your first post, you are trying to controll the led with an C Programm and this is not CNC related, then you are here in the wrong place.
Look at IGH Etherlab for creating your own ethercat applications in C-Language