RTC 8563 测试驱动程序

Makefile

all: rtc_app
CROSS_COMPILE = arm-linux-gnueabihf-
src := $(shell ls *.c)

rtc_app: $(src)
    $(CROSS_COMPILE)gcc -static -o $@ $^
    $(CROSS_COMPILE)strip $@
    @cp -f ./rtc_app /tftproot
clean:
    @rm -vf rtc_app *.o *~

main.c

#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>

int main(int argc, char **argv)
{
    int ret, fd;
    struct rtc_time rtc_tm;
    int dev_numb, cnt = 10;

    printf("\r\nPlease Select Devie: 0(rtc0), 1(rtc1), 2(rtc2):");
    scanf("%d",&dev_numb);

    if (0 == dev_numb) fd = open("/dev/rtc0", O_RDWR);
    else if (1 == dev_numb) fd = open("/dev/rtc1", O_RDWR);
    else if (2 == dev_numb) fd = open("/dev/rtc2", O_RDWR);
    else
    {
           printf( "Fail to Select Device%d!\n", dev_numb);
           exit(1);
    }

    if (fd < 0)
    {
           printf( "Fail to open PCF8563!\n" );
           exit(1);
    }

    ret=ioctl(fd, RTC_RD_TIME, &rtc_tm);
    if (ret < 0)
    {
           printf( "Fail to read_time!\n" );
    }
    else
    {
           printf( "\r\nRTC_RD_TIME as follow:" );
           printf( "\r\n>>rtc_tm.tm_isdst %d",rtc_tm.tm_isdst);
           printf( "\r\n>>rtc_tm.tm_yday  %d",rtc_tm.tm_yday);
           printf( "\r\n>>rtc_tm.tm_wday  %d",rtc_tm.tm_wday);
           printf( "\r\n>>rtc_tm.tm_year  %d",rtc_tm.tm_year);
           printf( "\r\n>>rtc_tm.tm_mon   %d",rtc_tm.tm_mon);
           printf( "\r\n>>rtc_tm.tm_mday  %d",rtc_tm.tm_mday);
           printf( "\r\n>>rtc_tm.tm_hour  %d",rtc_tm.tm_hour);
           printf( "\r\n>>rtc_tm.tm_min   %d",rtc_tm.tm_min);
           printf( "\r\n>>rtc_tm.tm_sec   %d",rtc_tm.tm_sec);
        printf("\r\nRead PCF8563 time is %d-%d-%d, %02d:%02d:%02d.\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);
    }

    rtc_tm.tm_year = rtc_tm.tm_year+1;
    rtc_tm.tm_mon = rtc_tm.tm_mon+1;
    rtc_tm.tm_mday = rtc_tm.tm_mday+1;
    rtc_tm.tm_hour = rtc_tm.tm_hour+1;
    rtc_tm.tm_min = rtc_tm.tm_min+1;
    rtc_tm.tm_sec = rtc_tm.tm_sec+1;


    ret = ioctl(fd, RTC_SET_TIME, &rtc_tm);
    if (ret < 0) {printf("Fail to set_time!%d\n",errno);}
    else {printf("set_time ok!\n");}

    while (cnt--)
    {
        ret=ioctl(fd, RTC_RD_TIME, &rtc_tm);
        if (ret < 0)
        {
               printf( "Fail to read_time!\n" );
        }
        printf("\r\nRead PCF8563 time is %d-%d-%d, %02d:%02d:%02d.\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);
        sleep(1);
    }

    close(fd);

    // sync system time as hardware rtc time
    ret = system( "/sbin/hwclock -s" );
    printf("hwclock opt %d\n",ret);

    return 0;
}

调试结果如下:
Please Select Devie: 0(rtc0), 1(rtc1), 2(rtc2):1                                
                                                                                
RTC_RD_TIME as follow:                                                          
>>rtc_tm.tm_isdst 0                                                             
>>rtc_tm.tm_yday  0                                                             
>>rtc_tm.tm_wday  1                                                             
>>rtc_tm.tm_year  114                                                           
>>rtc_tm.tm_mon   10                                                            
>>rtc_tm.tm_mday  11                                                            
>>rtc_tm.tm_hour  1                                                             
>>rtc_tm.tm_min   9                                                             
>>rtc_tm.tm_sec   36                                                            
Read PCF8563 time is 11-11-2014, 01:09:36.                                      
set_time ok!                                                                    
                                                                                
Read PCF8563 time is 12-12-2015, 02:10:37.                                      
                                                                                
Read PCF8563 time is 12-12-2015, 02:10:38.



硬件时钟与系统时钟同步：# hwclock --hctosys（hc代表硬件时间，sys代表系统时间）或者# clock --hctosys
系统时钟和硬件时钟同步：# hwclock --systohc或者# clock --systohc