Cortex_A9----RTC

RTC 实验

0001 1000
BCD:    18
0x :    0x18


RTC是什么？

RTCCON
CTLEN  [0] ： 1 = Enables RTC control

BCDSEC
SECDATA [6:4]：0 to 5
        [3:0]：0 to 9 

MINDATA [6:4]：0 to 5
        [3:0]：0 to 9 

BCDHOUR
HOURDATA [5:4]： 0 to 2
         [3:0]： 0 to 9 

BCDDAYWEEK
DAYWEEKDATA  [2:0]： 1 to 7

BCDDAY
DAYDATA [5:4]：0 to 3
        [3:0]  0 to 9

BCDMON
MONDATA [4]: 0 to 1
        [3:0]  0 to 9

BCDYEAR

YEARDATA [11:8] 0 to 9
         [7:4]  0 to 9  
         [3:0]  0 to 9 

#include "exynos_4412.h"
#include "uart.h"

int main()
{
    unsigned int old_time;

    /* 1. 使能RTC的控制寄存器 */
    RTCCON |= (0x1<<0);

    /* 2. 设置当前时间 */
    RTC.BCDYEAR = 0x16;
    RTC.BCDMON = 0x06;
    RTC.BCDDAY = 0x07; //芯片手册地址有误
    RTC.BCDWEEK = 0x13;
    RTC.BCDHOUR = 0x09;
    RTC.BCDMIN = 0x48;
    RTC.BCDSEC = 0x30;

    /* 3. 关闭RTC控制寄存器 */
    RTCCON &= (~(0x1<<0));

    uart_init();

    puts("*****************************  current time!  *************************\n");

    old_time = RTC.BCDSEC;
    while (1)
    {
        if (old_time != RTC.BCDSEC)
        {
            printf("year: 20%x, mon: %02x, day: %02x, week: %x\n", RTC.BCDYEAR, RTC.BCDMON, RTC.BCDWEEK, RTC.BCDDAY);
            printf("%02x:%02x:%02x\n", RTC.BCDHOUR, RTC.BCDMIN, RTC.BCDSEC);
            old_time = RTC.BCDSEC;
        }
    }

    return 0;
}