You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
// Ignacio Abundez Ortega
|
|
// gpio command tool
|
|
|
|
#include <stdio.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
//prototype functions
|
|
|
|
int gpio_export(const char *gpio);
|
|
int gpio_direction(int gpio, const char *direction);
|
|
int gpio_write(int gpio, int value);
|
|
|
|
int main (int argc, char *argv[]){
|
|
|
|
int fd;
|
|
char pin[] = "17";
|
|
|
|
gpio_export(pin);
|
|
//pin direction
|
|
fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
|
|
if (fd < 0){
|
|
perror("Error opening the GPIO path");
|
|
return -1;
|
|
}
|
|
write(fd,"out", 3);
|
|
close(fd);
|
|
|
|
|
|
//pin value
|
|
fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
|
|
if (fd < 0){
|
|
perror("Error opening the GPIO path");
|
|
return -1;
|
|
}
|
|
write(fd,"1", 1);
|
|
close(fd);
|
|
sleep(1);
|
|
|
|
fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
|
|
if (fd < 0){
|
|
perror("Error opening the GPIO path");
|
|
return -1;
|
|
}
|
|
write(fd,"0", 1);
|
|
close(fd);
|
|
sleep(1);
|
|
|
|
//unexport
|
|
fd = open("/sys/class/gpio/chip0/unexport", O_WRONLY);
|
|
if (fd < 0){
|
|
perror("Error opening the GPIO path");
|
|
return -1;
|
|
}
|
|
write(fd,"17", 2);
|
|
close(fd);
|
|
|
|
|
|
printf("Hello from Raspberry Pi!\n");
|
|
printf("Number of arguments: %d\n",argc);
|
|
printf("Program is reciving: %s\n",argv[0]);
|
|
|
|
if (argc > 1)
|
|
printf("Argument: %s\n", argv[1]);
|
|
return 0;
|
|
}
|
|
|
|
//Complete functions
|
|
//
|
|
//gpio_export
|
|
|
|
int gpio_export(const char *gpio){
|
|
|
|
int fd;
|
|
|
|
fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
|
|
if (fd < 0){
|
|
perror("Error opening the GPIO path");
|
|
return -1;
|
|
}
|
|
write(fd,gpio, strlen(gpio));
|
|
close(fd);
|
|
return(0);
|
|
}
|