rename loop.c to diff.c

V1: led5

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;
+}

V2/diff.c

@@ -0,0 +1,31 @@
+#include<stdio.h>
+#include<time.h>
+#include<pthread.h>
+
+int main(int argc, char *argv[])
+{
+	struct timespec time1, start, ende;
+	time1.tv_sec = 5;
+	time1.tv_nsec = 0;
+	clock_gettime(CLOCK_MONOTONIC, &start);
+	clock_nanosleep(CLOCK_MONOTONIC, 0, &time1, NULL);
+	clock_gettime(CLOCK_MONOTONIC, &ende);	
+
+	int nsec_difference = (int) ((ende.tv_nsec - start.tv_nsec)/1000);
+
+
+	//microseconds
+
+	int sec_difference = (int) (ende.tv_sec - start.tv_sec)*1000*1000;
+	int real_time_slept =  sec_difference + nsec_difference;
+	
+	int difference_real_set = real_time_slept - time1.tv_sec * 1000 * 1000;
+
+
+
+	printf("Real time slept: %d\n", real_time_slept);
+	printf("Difference Real time slept and actually sleep time: %d usec\n", difference_real_set);
+
+
+	return 0;
+}