turck 100000897, Instructions For Use Manual

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Commissioning
Programming LED functions
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7.7.5 Programming LED functions with C or C++
The following example shows the programming of the LED functions with Ansi C/C++.
#include <stdio.h>
#include <stdlib.h>
// initialize function (use extern for C++)
char* strcpy(char* target, const char* source);
char* strcat(char* s1, const char* s2);
int main(void) {
// LEDs for the customer:
char *appl_green_led = "appl_green";
char *appl_red_led = "appl_red";
char *error_green_led = "err_green";
char *error_red_led = "err_red";
char *run_green_led = "run_green";
char *run_red_led = "run_red";
char *LED_FILE = "/sys/class/leds/";
char *brightness = "/brightness";
FILE *fh;
char cur_Str[50] = {0};
strcpy(cur_Str, LED_FILE);
// take LED which will shine:
strcat(cur_Str, run_red_led);
strcat(cur_Str, brightness);
//WRITE:
printf("string to led: %s\n", cur_Str);
// write LED...
if((fh = fopen(cur_Str, "w")) != 0)
{
// write "1" to switch on and "0" to switch of LED
fputs((const char*)"0",fh);
fclose(fh);