79 lines
1.5 KiB
C
79 lines
1.5 KiB
C
/*
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* DS18B20 温度传感器(Debian jessie)
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <string.h>
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#include <time.h>
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#include <stdlib.h>
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#define BUF 270
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int _read_ds18b20(char *device)
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{
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char path[50] = "/sys/bus/w1/devices/";
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char rom[20];
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char buffer[BUF + 1];
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DIR *dirp;
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struct dirent *direntp;
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FILE *fp;
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char *temp;
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float value;
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system("sudo modprobe w1-gpio");
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system("sudo modprobe w1-therm");
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if ((dirp = opendir(path)) == NULL) {
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exit(0);
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}
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while ((direntp = readdir(dirp)) != NULL) {
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if (strstr(direntp->d_name, device)) {
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strcpy(rom, direntp->d_name);
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}
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}
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closedir(dirp);
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strcat(path, rom);
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strcat(path, "/w1_slave");
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//printf("%s\n", path);
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if ((fp = fopen(path, "r")) < 0) {
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exit(0); /* 文件不存在,则退出. */
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}
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while (fgets(buffer, BUF, fp) != NULL) {
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;
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}
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temp = strchr(buffer, 't');
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sscanf(temp, "t=%s", temp);
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value = atof(temp) / 1000;
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printf("%.0f\n", value);
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fclose(fp);
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return value;
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}
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int main(int argc, char *argv[])
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{
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int ch;
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opterr = 0;
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while ((ch = getopt(argc, argv, "d:h?")) != -1)
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switch (ch) {
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case 'd':
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_read_ds18b20(optarg);
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break;
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case 'h': case '?':
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printf("wind -d device\n");
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exit(0);
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break;
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default:
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;
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}
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return 1;
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}
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