Code with direction function

main.c

@@ -1,18 +1,21 @@
+// Christian Angelus 24/09/2026
+// 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;
-	//export
-	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
-	if(fd<0)
-	{
-		perror("Error openng the GPIO export path");
-		return -1;
-	}
-	write(fd, "17",2);
-	close(fd);
+	char pin[] = "17";
+	gpio_export(pin);
+
 	//pin direction
 	fd = open("/sys/class/gpio/chip0/gpio17/direction", O_WRONLY);
 	if(fd<0)
@@ -31,17 +34,8 @@ int main (int argc, char *argv[]){
 	}
 	write(fd, "1",1);
 	close(fd);
-	sleep(1);
 	//pin apagao
-	fd = open("/sys/class/gpio/chip0/gpio17/value", O_WRONLY);
-	if(fd<0)
-	{
-		perror("Error openng the GPIO export path");
-		return -1;
-	}
-	write(fd, "0",1);
-	close(fd);
-	sleep(1);
+	
 	//unexport
 	
 	fd = open("/sys/class/gpio/chip0/unexport", O_WRONLY);
@@ -62,3 +56,33 @@ int main (int argc, char *argv[]){
 		printf("Argument: %s\n", argv[1]);
 	return 0;
 }
+
+//Complete functions
+//
+//gpio export
+int gpio_export(const char *gpio){
+	int fd;
+	//export
+	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
+	if(fd<0){
+		perror("Error openng the GPIO path");
+		return -1;
+	}
+	write(fd,gpio, strlen(gpio));
+	close(fd);
+	return 0;
+}
+
+//Gpio direction
+int gpio_direction(int gpio, const char *direction){
+	int fd;
+	//export
+	fd = open("/sys/class/gpio/chip0/export", O_WRONLY);
+	if(fd<0){
+		perror("Error openng the GPIO path");
+		return -1;
+	}
+	write(fd,gpio, strlen(direction));
+	close(fd);
+	return 0;
+	}