RTC走时功能+GPIO控制LCD12864显示

eew_xQfw2M

RTC走时功能+GPIO控制LCD12864显示 [复制链接]

    本文记录rtc走时功能，并使用GPIO控制LCD12864液晶显示出当前时间

    新建rtc.c文件，添加到工程当中，

    其中：

        0. rtc使用32k晶体时钟；

    set_rtc_time函数是设置rtc的时间，

        1. 芯片上电后，仅设置一次rtc时间，重复调用不会重新设置rtc时间，rtc时间丢失后才会重新设置时间；

        2. 设置的时间为代码编译时的系统时间；

    set_rtc_alarm函数是设置alarm中断功能，

        3. 利用subsecond alarm中断功能，实现每秒进一次RTC Alarm中断，并在中断处理函数中获取当前时间，并显示出来；

 

代码如下：   

#include "gd32l23x.h"
#include "rtc.h"
#include "lcd12864.h"


//#define RTC_CLOCK_SOURCE_IRC32K
#define RTC_CLOCK_SOURCE_LXTAL
#define BKP_VALUE    0x32F0

static rtc_parameter_struct   rtc_initpara;
static rtc_alarm_struct  rtc_alarm;
__IO uint32_t prescaler_a = 0, prescaler_s = 0;

void rtc_pre_config(void)
{
    /* enable PMU and BKP clock */
    rcu_periph_clock_enable(RCU_PMU);
    rcu_periph_clock_enable(RCU_BKP);
    /* enable the access of the RTC registers */
    pmu_backup_write_enable();
    
#if defined (RTC_CLOCK_SOURCE_IRC32K)
    rcu_osci_on(RCU_IRC32K);
    rcu_osci_stab_wait(RCU_IRC32K);
    rcu_rtc_clock_config(RCU_RTCSRC_IRC32K);

    prescaler_s = 0x13F;
    prescaler_a = 0x63;
#elif defined (RTC_CLOCK_SOURCE_LXTAL)
    rcu_osci_on(RCU_LXTAL);
    rcu_osci_stab_wait(RCU_LXTAL);
    rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);
    prescaler_s = 0xFF;
    prescaler_a = 0x7F;
#else
#error RTC clock source should be defined.
#endif /* RTC_CLOCK_SOURCE_IRC32K */

    rcu_periph_clock_enable(RCU_RTC);
    rtc_register_sync_wait();
}

static uint8_t gSystemDate[12] = __DATE__;
static uint8_t gSystemTime[16] = __TIME__;
void set_rtc_time(void)
{
  uint32_t tmp;
  rtc_parameter_struct rtc_stime;
  rtc_parameter_struct rtc_gtime;
  int i,j,k=0;
  char month[12][3]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec",};
  
  rtc_pre_config();

  rtc_current_time_get(&rtc_gtime);
  tmp = rtc_gtime.year;
  
  //Set rtc time only once after power up
  if(tmp<0x22)
  {
    //month
    for(i=0; i<12; i++)
    {
      for(j=0; j<3; j++)
      {
        if(gSystemDate[j] == month[i][j])
        {
          k++;
        }
        else
        {
          k=0;
          break;
        }
      }
      if(k==3)
      {
        if(i>=9) i+=6;
        rtc_stime.month = i+1;
        
        break;
      }
    }
    //day
    if(gSystemDate[4] == ' ') gSystemDate[4] = '0';
    rtc_stime.date = (gSystemDate[4]-'0')*16 + (gSystemDate[5]-'0');
    //year
    rtc_stime.year = (gSystemDate[9]-'0')*16 + (gSystemDate[10]-'0');
    //hour
    rtc_stime.hour   = (gSystemTime[0]-'0')*16 + (gSystemTime[1]-'0') ;
    //minute
    rtc_stime.minute = (gSystemTime[3]-'0')*16 + (gSystemTime[4]-'0') ;
    //second
    rtc_stime.second = (gSystemTime[6]-'0')*16 + (gSystemTime[7]-'0') ;

    rtc_stime.day_of_week = RTC_SATURDAY;
    rtc_stime.display_format = RTC_24HOUR;
    rtc_stime.factor_asyn = prescaler_a;
    rtc_stime.factor_syn = prescaler_s;
    rtc_stime.am_pm = RTC_AM;

    if (ERROR == rtc_init(&rtc_stime))
    {
       LCD_printf_line(7,"rtc init error");
    }
  }
}

void set_rtc_alarm(void)
{
    rtc_alarm_struct rtc_alarm_time;
    
    // 
    rtc_alarm_time.alarm_mask = RTC_ALARM_ALL_MASK;
    rtc_alarm_config(RTC_ALARM0, &rtc_alarm_time);
    
    // subsecond
    rtc_alarm_subsecond_config(RTC_ALARM0, RTC_MSKSSC_NONE, 0);

    rtc_flag_clear(RTC_FLAG_ALARM0);
    rtc_interrupt_enable(RTC_INT_ALARM0);
    rtc_alarm_enable(RTC_ALARM0);

    /* RTC alarm interrupt configuration */
    exti_init(EXTI_17, EXTI_INTERRUPT, EXTI_TRIG_RISING);
    nvic_irq_enable(RTC_Alarm_IRQn, 2U);

}

void get_rtc_time_and_display(void)
{
    rtc_parameter_struct rtc_gtime;

    rtc_current_time_get(&rtc_gtime);

    LCD_printf_line(7,"20%02x-%02x-%02x %02x:%02x:%02x %x", \
        rtc_gtime.year, rtc_gtime.month,  rtc_gtime.date,   \
        rtc_gtime.hour, rtc_gtime.minute, rtc_gtime.second, \
        rtc_gtime.day_of_week);

}

中断处理函数：

void RTC_Alarm_IRQHandler(void)
{
    if (SET == rtc_flag_get(RTC_FLAG_ALARM0))
    {
        rtc_flag_clear(RTC_FLAG_ALARM0);
        get_rtc_time_and_display();
    }
}

 

eew_xQfw2M

中断处理函数

void RTC_Alarm_IRQHandler(void)
{
    if (SET == rtc_flag_get(RTC_FLAG_ALARM0))
    {
        exti_flag_clear(EXTI_17);
        rtc_flag_clear(RTC_FLAG_ALARM0);
        get_rtc_time_and_display();
    }
}