Mini2440裸机开发之RTC

/*****************************************************************************************************************
 *
 *  FileName  : rtc.h
 *  Function  : RTC
 *  Author    : zy
 *
 ****************************************************************************************************************/

#ifndef  __RTC_H__
#define  __RTC_H__


#include  "type.h"
#include  "gpio.h"


/******************************************************************************************************************/

#ifdef  __BIG_ENDIAN
#define     RTCCON          (*(volatile u8 *) 0x57000043)
#define     TICNT           (*(volatile u8 *) 0x57000047)
#define     RTCALM          (*(volatile u8 *) 0x57000053)
#define     ALMSEC          (*(volatile u8 *) 0x57000057)
#define     ALMMIN          (*(volatile u8 *) 0x5700005B)
#define     ALMHOUR         (*(volatile u8 *) 0x5700005F)
#define     ALMDATE         (*(volatile u8 *) 0x57000063)
#define     ALMMON          (*(volatile u8 *) 0x57000067)
#define     ALMYEAR         (*(volatile u8 *) 0x5700006B)
#define     RTCRST          (*(volatile u8 *) 0x5700006F)
#define     BCDSEC          (*(volatile u8 *) 0x57000073)
#define     BCDMIN          (*(volatile u8 *) 0x57000077)
#define     BCDHOUR         (*(volatile u8 *) 0x5700007B)
#define     BCDDATE         (*(volatile u8 *) 0x5700007F)
#define     BCDDAY          (*(volatile u8 *) 0x57000083)
#define     BCDMON          (*(volatile u8 *) 0x57000087)
#define     BCDYEAR         (*(volatile u8 *) 0x5700008B)

#else   /* Little Endian */

/*  RTC控制寄存器 */
#define         RTCCON             (*(volatile u8 *)0x57000040)
/*  时钟节拍计数寄存器 */
#define     TICNT             (*(volatile u8 *)0x57000044)
/*  RTC闹钟控制寄存器 */
#define     RTCALM             (*(volatile u8 *)0x57000050)
/* 闹钟数据寄存器 */
#define        ALMSEC            (*(volatile u8 *)0x57000054)
#define        ALMMIN            (*(volatile u8 *)0x57000058)
#define        ALMHOUR            (*(volatile u8 *)0x5700005C)
#define        ALMDATE            (*(volatile u8 *)0x57000060)
#define        ALMMON            (*(volatile u8 *)0x57000064)
#define        ALMYEAR            (*(volatile u8 *)0x57000068)
/* BCD寄存器 */
#define        BCDSEC            (*(volatile u8 *)0x57000070)
#define        BCDMIN            (*(volatile u8 *)0x57000074)
#define        BCDHOUR            (*(volatile u8 *)0x57000078)
#define        BCDDATE            (*(volatile u8 *)0x5700007C)
#define        BCDDAY            (*(volatile u8 *)0x57000080)
#define        BCDMON            (*(volatile u8 *)0x57000084)
#define        BCDYEAR            (*(volatile u8 *)0x57000088)
#endif


/* 星期 */
typedef enum
{
   Sunday,                  /* 星期日 */
   Monday,                  /* 星期一 */
   Tuesday,                  /* 星期一二 */
   Wednesday,              /* 星期三 */
   Thursday,              /* 星期四 */
   Friday,                  /* 星期五 */
   Saturday                  /* 星期六 */
}WEEK;


/* 日历 */
typedef struct
{
  u16 year;
  u8 month;
  u8 day;
  u8 hour;
  u8 min;
  u8 sec;
  WEEK week;
}calendar;


/* 函数声明 */
extern  void rtc_set(calendar date);      /* 时间校准 */
extern  void rtc_get(calendar *date);     /* 获取RTC时间 */
u8* get_week(WEEK week);                  /* 将星期转换为字符串 */
extern void rtc_tick_init();              /* RTC滴答设置 */
extern void rtc_alarm_init();             /* RTC闹钟设置 */

#endif

/**************************************************************************
 *
 *  FileName  : rtc.c
 *  Function  : RTC
 *  Author    : zy
 *
 *************************************************************************/
#include "rtc.h"
#include "isr.h"
#include "stdio.h"

/*************************************************************
*
*  Function  : RTC16进制转为10进制
*  Input     : val  需要转换的BCD数
*  Return    ：转换完成的10进制值
*
**************************************************************/
u8 rtc_bcd_to_ten(u8 val)
{
    u8 temp = 0;
    temp = (val>>4)*10;
    return (temp + (val&0x0f));
}


/*************************************************************
*
*  Function  : RTC10进制转为16进制
*  Input     : val  需要转换的10进制数
*  Return    ：转换完成的BCD值
*
**************************************************************/
u8 rtc_ten_to_bcd(u8 val)
{
  u8 high = val / 10;
  u8 low = val %10 ;
  return (high<<4|low);
}


/*************************************************************
*
*  Function  : 中断源8  RTC 时钟滴答中断
*
**************************************************************/
void TICK_IRQHandler()
{
    calendar current_date;
    rtc_get(&current_date);
    printf("NOWTIME: %04d-%02d-%02d %s %02d:%02d:%02drn",current_date.year,
            current_date.month,
            current_date.day,
            get_week(current_date.week),
            current_date.hour,
            current_date.min,
            current_date.sec);

    /* 清除滴答中断位 */
    SRCPND |= BIT_TICK;
    INTPND |= BIT_TICK;
}


/*************************************************************
*
*  Function  : 中断源30  RTC RTC闹钟中断处理函数
*
**************************************************************/
void RTC_IRQHandler()
{
    printf("alarm intrn");

    /* 清除中断位 */
    SRCPND |= BIT_RTC;
    INTPND |= BIT_RTC;
}



/*************************************************************
*
*  Function  : 校准RTC实时时钟   以2000年1月1日为基址  星期六
*  Input     : date  当前时间
*
**************************************************************/
void rtc_set(calendar date)
{
    /* RTC读写使能，BCD时钟、计数器、无复位 */
    RTCCON = 0x01;

    BCDYEAR = rtc_ten_to_bcd(date.year - 2000);
    BCDMON  = rtc_ten_to_bcd(date.month);
    BCDDATE = rtc_ten_to_bcd(date.day);
    BCDDAY  = rtc_ten_to_bcd(date.week + 1);
    BCDHOUR = rtc_ten_to_bcd(date.hour);
    BCDMIN  = rtc_ten_to_bcd(date.min);
    BCDSEC  = rtc_ten_to_bcd(date.sec);

    RTCCON = 0x00;
}

/*************************************************************
*
*  Function  : RTC时间获取 以2000年1月1日为基址  星期六
*  Input    : date
*
**************************************************************/
void rtc_get(calendar *date)
{
       /* RTC读写使能，BCD时钟、计数器、无复位 */
       RTCCON = 0x01;

       date->year  = rtc_bcd_to_ten(BCDYEAR) + 2000;
       date->month = rtc_bcd_to_ten(BCDMON & 0x1F);
       date->day   = rtc_bcd_to_ten(BCDDATE & 0x3F);
       date->week  = rtc_bcd_to_ten(BCDDAY & 0x07) - 1;
       date->hour  = rtc_bcd_to_ten(BCDHOUR & 0x3F);
       date->min   = rtc_bcd_to_ten(BCDMIN  & 0x7F);
       date->sec   = rtc_bcd_to_ten(BCDSEC  & 0x7F);

       RTCCON = 0x00;
}

/*************************************************************
*
*  Function  : 将星期转换为字符串
*  Input    : week 星期
*
**************************************************************/
u8* get_week(WEEK week)
{
  const u8 *week_str[7] = {"SUN","MON","TUES","WED","THURS","FRI","SAT"};
  return week_str[week];
}



/*************************************************************
*
*  Function  : RTC滴答设置
*
**************************************************************/
void rtc_tick_init()
{
    /* 时钟节拍周期 = （时间计数+1）/128 = （127+1）/128 = 1s */
    TICNT = ((1<<7) | (0x7f<<0));  /*  使能中断，时间计数设置为127  */


    /* 清除时钟节拍中断位 */
    SRCPND |= BIT_TICK;
    INTPND |= BIT_TICK;

    /* 使能时钟节拍中断 */
    INTMSK &= ~BIT_TICK;
}

/*************************************************************
*
*  Function  : RTC闹钟设置
*
**************************************************************/
void rtc_alarm_init()
{
    /* RTC读写使能，BCD时钟、计数器、无复位 */
    RTCCON = 1;

    /* 秒闹钟设置为0，当秒数为0时，触发中断 */
    ALMSEC = 0;

    /*  使能全局闹钟，使能秒闹钟 */
    RTCALM |= ((1<<6) | (1<<0));

    /* RTC读写禁止，BCD时钟、计数器、无复位 */
    RTCCON = 0;

    /*  清除闹钟中断位 */
    SRCPND |= BIT_RTC;
    INTPND |= BIT_RTC;

    /* 使能闹钟中断 */
    INTMSK &= ~BIT_RTC;
}

#include "led.h"
#include "common.h"
#include "uart.h"
#include "rtc.h"

calendar current_date = {
    .year  = 2023,
    .month = 1,
    .day   = 1,
    .week  = Sunday,
    .hour  = 0,
    .min   = 0,
    .sec   = 0,
};

int main()
{
    u8 i = 0;
    vector_enable();

    led_init();
    uart_init();
    rtc_tick_init();
    rtc_alarm_init();
    delay_ms(1000);
    printf("rtc set 2023-01-01 00:00:00 rn");
    rtc_set(current_date);

    while(1)
    {
        led_turn(LED1);
        delay_ms(1000);
    }
    return 0;
}

rtc set 2023-01-01 00:00:00 
alarm int
NOWTIME: 2023-01-01 SUN 00:00:00
NOWTIME: 2023-01-01 SUN 00:00:01
NOWTIME: 2023-01-01 SUN 00:00:02
NOWTIME: 2023-01-01 SUN 00:00:03
NOWTIME: 2023-01-01 SUN 00:00:04
NOWTIME: 2023-01-01 SUN 00:00:05
NOWTIME: 2023-01-01 SUN 00:00:06
NOWTIME: 2023-01-01 SUN 00:00:07......
NOWTIME: 2023-01-01 SUN 00:00:52
NOWTIME: 2023-01-01 SUN 00:00:53
NOWTIME: 2023-01-01 SUN 00:00:54
NOWTIME: 2023-01-01 SUN 00:00:55
NOWTIME: 2023-01-01 SUN 00:00:56
NOWTIME: 2023-01-01 SUN 00:00:57
NOWTIME: 2023-01-01 SUN 00:00:58
NOWTIME: 2023-01-01 SUN 00:00:59
alarm int
NOWTIME: 2023-01-01 SUN 00:01:00