outsourcing of gpio-code

project/gpio.c

@@ -0,0 +1,51 @@
+/*GPIO.c*/
+#include<stdio.h>
+#include<fcntl.h>
+#include<string.h>
+#include<unistd.h>
+#include<string.h>
+
+#define BASEPATH "/sys/class/gpio/"
+#define GPIO_FOLDER "gpio%s/"
+
+void writeFile(char *filename, char *buffer, size_t count)
+{
+	int fd = open(filename, O_WRONLY);
+	if(fd == -1) {
+		perror("Fehler bei open ");
+	}
+	write(fd, buffer, count);
+	close(fd);
+}
+
+void registerPin(char *pin)
+{
+	writeFile(BASEPATH "export", pin, strlen(pin));
+}
+
+void freePin(char *pin)
+{
+	writeFile(BASEPATH "unexport", pin, strlen(pin));
+}
+
+void setDirection(char *pin, char *direction, int dirlen)
+{
+	char path[50];
+	sprintf(path, BASEPATH GPIO_FOLDER "direction", pin);
+	writeFile(path, direction, dirlen);
+}
+
+void registerOutput(char *pin)
+{
+	registerPin(pin);
+	setDirection(pin, "out", 3);
+}
+
+void writeOutput(char *pin, int state)
+{
+	char path[50];
+	sprintf(path, BASEPATH GPIO_FOLDER "value", pin);
+	FILE *fd = fopen(path, "w");
+	fprintf(fd, "%i", state);
+	fclose(fd);
+}