Merge pull request #3 from sikienzl/v1-switch

V1: switch.c

README.md

@@ -1,2 +1,2 @@
-# resy-ss17-template
+# resy-ss17-grp1
 Template for grp repositories

V1/switch.c

@@ -0,0 +1,120 @@
+/*
+ * switch.c
+ * How to register an button and count this
+ * author: Simon Wörner, Manuel Vögele,
+ * 	   Siegfried Kienzle
+ * 24-March-2017
+ *  
+ *  */
+
+#define BUTTON "17"
+#define IN "in\n"
+#define OUT "out\n"
+#define HIGH "1\n"
+#define LOW "0\n"
+#define MAXBYTES 1
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int writeIntoFile(char* value, char* path)
+{
+	int fd;
+	char buffer[3];
+	strcpy(buffer, value);
+	if((fd=open(path, O_RDWR | O_CREAT | O_TRUNC)) == -1) {
+		perror(NULL);
+		return EXIT_FAILURE;
+	}
+
+	if((write(fd, &buffer, sizeof(buffer))) == -1) {
+		perror("Cannot write into file");
+		return EXIT_FAILURE;			
+	} 	
+	printf("Success");
+	close(fd);
+	return EXIT_SUCCESS;	
+}
+
+int reserve(char* gpioPort)
+{
+	char str[3];
+	strcpy(str, gpioPort);
+	strcat(str, "\n");
+	return writeIntoFile(str,"/sys/class/gpio/export");
+}
+
+int setDirection(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 setOutput(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 mainLoop(char* gpioPort)
+{
+	int fid, portValue, count, countButton;
+	char *val = "/value";
+	char *gpioPath = "/sys/class/gpio/gpio";
+	char path[28];
+	strcpy(path, gpioPath);
+	strcat(path, gpioPort);
+	strcat(path, val);
+	
+	while(true)
+	{
+		if( (fid=open(path, O_RDONLY)) == -1)
+			perror("Fehler ");
+		if(readInput(fid) == 1)
+		{
+			countButton++;
+			printf("%d", countButton);
+		}
+		
+	
+		close(fid);
+	}
+}
+
+char[] readInput(int fid)
+{
+	char buffer[MAXBYTES];
+	read(fid, &buffer, MAXBYTES);
+	return buffer;
+}
+
+int unexport(char* gpioport)
+{
+	char str[3];
+	strcpy(str, gpioPort);
+	strcat(str, "\n");
+	return writeIntoFile(str,"/sys/class/gpio/unexport");
+}
+
+
+int main()
+{  
+	reserve(BUTTON);
+	setDirection(BUTTON, IN);
+	mainLoop(BUTTON);
+	unexport(BUTTON);
+	return 0;
+}