设为首页收藏本站

米尔科技论坛

 找回密码
 注册账号

QQ登录

只需一步,快速开始

查看: 11939|回复: 0

ARM Linux实时时钟RTC示例程序

[复制链接]

231

主题

295

帖子

2145

积分

管理员

Rank: 9Rank: 9Rank: 9

积分
2145
玉米糊 发表于 2015-3-10 14:47:27 | 显示全部楼层 |阅读模式
ARM Linux实时时钟RTC示例程序,如下:

/********************************************************************
*                 copyright (C) 2014 all rights reserved
*                         @file: rtc_test.c
*                   @Created: 2014-8-7 10:30
*                      @Author: conway chen
*           @Description: read and write rtc time  
*          @Modify Date: 2014-8-7 10:30
*********************************************************************/
#include <stdio.h>
#include <linux/rtc.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <string.h>
   
static const char default_rtc[] = "/dev/rtc0";
static char *program_name;

/**
 * @brief: print help message 
 */
static void help(void)
{        
        fprintf(stderr,
"\tUsage: %s [OPTION]...\n"
"\t-h,--help      help\n"
"\t-s,--set       set date/time given with you.\n\tinput format:./rtc_test [hour] [minute] [second] [year] [month] [day]\n"
"\t-r,--show      read hardware clock and print result\n"
"\n", program_name);
} 
 
/**
 * @brief: read RTC date and time 
 * @Param: fd: the file descriptor of rtc device  
 */
void rtc_read_time(int fd)
{
        int retval;
        struct rtc_time rtc_tm;
        
        /*read the RTC time/date*/
        retval = ioctl(fd, RTC_RD_TIME, &rtc_tm);
        if (retval == -1) {
                perror("RTC_RD_TIME ioctl");
                exit(errno);
        }

        fprintf(stderr, "\n\tCurrent RTC date/time is %d-%d-%d, %02d:%02d:%02d.\n\n",
                rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
                rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);

        
}

/**
 * @brief: set rtc date and time  
 * @Param: fd: the file descriptor of rtc device 
 * @Param: hour: the hour to set
 * @Param: minute: the minute to set 
 * @Param: second: the hour to set
 * @Param: year: the year to set
 * @Param: month: the month to set
 * @Param: day: the day to set
 */
void rtc_set_time(int fd, int hour, int minute, int second, int year, int month, int day)
{
        int retval;
        struct rtc_time rtc_tm;
        
        rtc_tm.tm_mday = day;
        rtc_tm.tm_mon = month - 1;
        rtc_tm.tm_year = year - 1900;
        rtc_tm.tm_hour = hour;
        rtc_tm.tm_min = minute;
        rtc_tm.tm_wday = rtc_tm.tm_yday = rtc_tm.tm_isdst = 0;
        rtc_tm.tm_sec = second;
        /*set the RTC time/date*/
        retval = ioctl(fd, RTC_SET_TIME, &rtc_tm);
        if (retval == -1) {
                perror("RTC_SET_TIME ioctl");
                exit(errno);
        }        
        
        fprintf(stderr, "\n\t\tdate/time is updated to:  %d-%d-%d, %02d:%02d:%02d.\n\n",
                rtc_tm.tm_mday, rtc_tm.tm_mon + 1, rtc_tm.tm_year + 1900,
                rtc_tm.tm_hour, rtc_tm.tm_min, rtc_tm.tm_sec);
}

/**
 * @brief: main function  
 * @Param: argc: number of parameters
 * @Param: argv: parameters list
 */ 
int main(int argc, char *argv[])
{
        int fd, retval, c;
        int set_flag = 0, read_flag = 0;
        struct rtc_time rtc_tm;
        const char *rtc = default_rtc;
        
        struct option long_option[] =
    {
            {"help", 0, NULL, 'h'},        
        {"set", 1, NULL, 's'},
        {"show", 0, NULL, 'r'},
        {NULL, 0, NULL, 0},
    };
    
    program_name = argv[0];            
        
    while (1) {
            if ((c = getopt_long(argc, argv, "hs:r", long_option, NULL)) < 0)
                    break;
            switch (c) {
                case 'h':
                                help();
                                break;                
                case 's':
                                if (argc < 8) {
                                fprintf(stderr, "\n\t\ttime format error!\n\n");
                                exit(errno);        
                                }        
                                set_flag = 1;
                                break;
                case 'r':
                                read_flag = 1;
                                break;
                case '?':
                                help();
                                break;
                default:
                                abort ();
            }
    }
    
    /* open rtc device */
    fd = open(rtc, O_RDWR);
        if (fd ==  -1) {
                perror(rtc);
                exit(errno);
        }
        
        if (argc == 1) {
                rtc_read_time(fd);        
        }
    
    if (set_flag) 
                rtc_set_time(fd, atoi(argv[2]), atoi(argv[3]), atoi(argv[4]), atoi(argv[5]), atoi(argv[6]), atoi(argv[7]));
        if (read_flag)
                rtc_read_time(fd);
    
    close(fd);

        return 0;
}
最后,附上Makefile文件下载: Makefile (222 Bytes, 下载次数: 7268)
回复

使用道具 举报

您需要登录后才可以回帖 登录 | 注册账号

本版积分规则

Archiver|手机版|小黑屋|米尔科技论坛   

GMT+8, 2022-5-28 15:11 , Processed in 0.206860 second(s), 31 queries .

Powered by Discuz! X3.1

© 2001-2013 Comsenz Inc.

快速回复 返回顶部 返回列表