add function voltage and inOrOut

V1/switch.c

@@ -7,12 +7,14 @@
  *  
  *  */
 
-#define PIN01 "1\n"
-#define PIN12 "12\n"
-#define PIN11 "11\n"
-#define PIN06 "6\n"
+#define PIN01 "1"
+#define PIN12 "12"
+#define PIN11 "11"
+#define PIN06 "6"
 #define IN "in\n"
 #define OUT "out\n"
+#define V33 "1\n"
+#define V0 "0\n"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -20,12 +22,12 @@
 #include <unistd.h>
 #include <fcntl.h>
 
-int reserve(char* gpioPort)
+int writeIntoFile(char* value, char* path)
 {
 	int fd;
-	char buffer[2];
-	strcpy(buffer, gpioPort );
-	if((fd=open("/sys/class/gpio/export", O_RDWR | O_CREAT | O_TRUNC)) == -1) {
+	char buffer[3];
+	strcpy(buffer, value);
+	if((fd=open(path, O_RDWR | O_CREAT | O_TRUNC)) == -1) {
 		perror(NULL);
 		return EXIT_FAILURE;
 	}
@@ -39,13 +41,40 @@ int reserve(char* gpioPort)
 	return EXIT_SUCCESS;	
 }
 
-int inOut(char gpioPort, char * inOut)
+int reserve(char* gpioPort)
 {
+	char str[3];
+	strcpy(str, gpioPort);
+	strcat(str, "\n");
+	return writeIntoFile(str,"/sys/class/gpio/export");
+}
 
+int inOrOut(char* gpioPort, char* inOut)
+{
+	char *direc = "/direction";
+	char *gpioPath = "/sys/class/gpio/gpio";	
+	char path[32];
+	strcpy(path, gpioPath);
+        strcat(path, gpioPort);
+	strcat(path, direc);
+	return writeIntoFile(inOut, path);
+}
+
+int voltage(char* gpioPort, char* volt)
+{
+	char *val = "/value";
+	char *gpioPath = "/sys/class/gpio/gpio";
+	char path[28];
+	strcpy(path, gpioPath);
+	strcat(path, gpioPort);
+	strcat(path, val);
+	return writeIntoFile(volt, path);
 }
 
 int main()
 {
   	reserve(PIN06);  
+  	inOrOut(PIN06, OUT);
+	voltage(PIN06, V0);
 	return 0;
 }