20180311

raspberrypi_zero/gpio/wind.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <string.h>
+#include <time.h>
+#include <stdlib.h>
+
+#define N 80
+
+int main(int argc, char *argv[])
+{
+    char path[50] = "/sys/bus/w1/devices/";
+    char rom[20];
+    char buffer[N+1];
+    DIR *dirp;
+    struct dirent *direntp;
+    FILE *fp;
+    char *temp;
+    float value;
+	
+    system("sudo modprobe w1-gpio");
+    system("sudo modprobe w1-therm");
+    if((dirp = opendir(path)) == NULL) {
+        exit(0);
+    }
+
+    while((direntp = readdir(dirp)) != NULL) {
+        if(strstr(direntp->d_name, "28-0")) {
+            strcpy(rom, direntp->d_name);
+        }
+    }
+    closedir(dirp);
+
+    strcat(path, rom);
+    strcat(path, "/w1_slave");
+    //printf("%s\n", path);
+
+    if ((fp = fopen(path, "r")) < 0) {
+        exit(0);    /* 文件不存在,则退出. */
+    }
+    while(fgets(buffer, N, fp) != NULL){
+        ;
+    }
+
+    temp = strchr(buffer, 't');
+    sscanf(temp, "t=%s", temp);
+    value = atof(temp) / 1000;
+    printf("%.0f\n", value);
+
+    fclose(fp);
+    return 0;
+}
+