temperatura.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/fcntl.h>
int main(int argc, char *argv[])
{
int fd = -1, ret;
char *tmp1, tmp2[10], ch='t';
char devname_head[50] =
"/sys/devices/w1_bus_master1/28-00000";
char devname_end[10] = "/w1_slave";
char dev_name[100];
long value;
int integer, decimal;
char buffer[100];
int i,j;
strcpy(dev_name, devname_head);
strcat(dev_name, argv[1]);
strcat(dev_name, devname_end);
if ((fd = open(dev_name, O_RDONLY)) < 0)
{
perror("Greška pri otvaranju!");
exit(1);
}
ret = read(fd, buffer, sizeof(buffer));
if (ret < 0)
{
perror("Greška pri čitanju!");
exit(1);
}
tmp1 = strchr(buffer, ch);
sscanf(tmp1, "t=%s", tmp2);
value = atoi(tmp2);
integer = value / 1000;
decimal = value % 1000;
printf("Temperatura je %d.%d\n", integer,decimal);
close(fd);
return 0;
}