I'm new to beaglebone and to C programming so I may be asking a stupid
question but when I try to run the following code it exports gpio44 but
gives a segmentation fault error and stops.
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
void export_pin(char pin_n[]);
void unexport_pin(char pin_n[]);
void set_pin(char pin_n[], char pin_val[]);
int main() {
set_pin("44", "1");
return 0;
}
void set_pin(char pin_n[], char pin_val[]) {
export_pin(pin_n);
FILE *direction = 0;
FILE *value = 0;
char pin_dir[] = "out";
direction = fopen("/sys/class/gpio/gpio68/direction", "w");
fwrite(pin_dir, 1, sizeof(pin_dir), direction);
fclose(direction);
value = fopen("/sys/class/gpio/gpio68/value", "w");
fwrite(pin_val, 1, sizeof(pin_val), value);
fclose(value);
}
void export_pin(char pin_n[]) {
FILE *export = NULL;
export = fopen("/sys/class/gpio/export", "w");
fwrite(pin_n, 1, sizeof(pin_n), export);
fclose(export);
}
void unexport_pin(char pin_n[]) {
FILE *unexport = NULL;
unexport = fopen("/sys/class/gpio/unexport", "w");
fwrite(pin_n, 1, sizeof(pin_n), unexport);
fclose(unexport);
}
I have no idea what could be causing this.
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