刚学PIC单片机，分享第一个电子时钟，定时器计时

ID:190577 · 发表于 2019-10-12 12:15

#define _XTAL_FREQ 4000000 //晶振定义
#include<pic.h> //头文件包含
//__CONFIG(0x3b31);//芯片配置字定义
// CONFIG1
#pragma config FOSC = XT       // Oscillator Selection bits (XT oscillator: Crystal/resonator on RA6/OSC2/CLKOUT and RA7/OSC1/CLKIN)
#pragma config WDTE = OFF    // Watchdog Timer Enable bit (WDT disabled and can be enabled by SWDTEN bit of the WDTCON register)
#pragma config PWRTE = OFF    // Power-up Timer Enable bit (PWRT disabled)
#pragma config MCLRE = ON    // RE3/MCLR pin function select bit (RE3/MCLR pin function is MCLR)
#pragma config CP = OFF       // Code Protection bit (Program memory code protection is disabled)
#pragma config CPD = OFF       // Data Code Protection bit (Data memory code protection is disabled)
#pragma config BOREN = ON    // Brown Out Reset Selection bits (BOR enabled)
#pragma config IESO = ON       // Internal External Switchover bit (Internal/External Switchover mode is enabled)
#pragma config FCMEN = ON    // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)
#pragma config LVP = ON       // Low Voltage Programming Enable bit (RB3/PGM pin has PGM function, low voltage programming enabled)
// CONFIG2
#pragma config BOR4V = BOR40V // Brown-out Reset Selection bit (Brown-out Reset set to 4.0V)
#pragma config WRT = OFF       // Flash Program Memory Self Write Enable bits (Write protection off)
//宏定义
#define uchar unsigned char
#define uint unsigned int
#define RS RC0 //命令数据选择
#define RW RC1 //读写选择
#define EN RC2 //使能
uint count=0;
uchar miao,fen,shi;
/*******************延时函数部分******************
大约延时1ms
************************************************/
void delayms(uint ms)
{
      uchar i,j;
      for(j=ms;j>0;j--)
      for(i=110;i>0;i--);
}

/*******************1602发送主函数******************
************************************************/
void LCD_WRITE(uchar data,uchar com)
{
      RS=com;//1表示数据；0表示命令
      PORTD=data;//将数据写入
      delayms(5);//延时
      EN=1;//使能
      delayms(5);//延时
      EN=0;//关闭
}
/*******************1602显示主函数******************
//指定位置显示字符
//输入：列地址X（0~15），行地址y（0~1）
// 字符串指针*p，要显示的字符个数num
************************************************/
void disp_1602(uchar x,uchar y,uchar *p,uchar num)
{
      uchar i;
      for(i=0;i<num;i++)
      {
      if(0==y)
      x|=0x80;//第一行地址为0x80
      else
      x|=0xc0;//第二行地址为0xC0
      LCD_WRITE(x,0); //写地址命令
      LCD_WRITE(*p,1);//写数据
      x++;//地址加
      p++;//显示字符地址加
}
}
/*******************初始化函数部分******************
************************************************/
void LCD_init(void)
{
      // ADCON1=0x07;//定义RE为数据口
      TRISC0=0;
      TRISC1=0;
      TRISC2=0;//RE口为输出
      RC0=0;
      RC1=0;
      RC2=0;//初始化输出低电平
      TRISD=0;//D口为输出
      PORTD=0;//输出0
      LCD_WRITE(0x38,0);//设置8位总线，双行显示
      LCD_WRITE(0x01,0);//清屏
      LCD_WRITE(0x0c,0);//开显示，关光标
      LCD_WRITE(0x06,0);//光标右移
      LCD_WRITE(0x80,0);//第一行显示位置
}
/*******************主程序函数******************
************************************************/
void main(void)
{
LCD_init();//端口初始化
T1CKPS0=1;
T1CKPS1=1;             //前置分频器8分频
TMR1CS=0;                //TMR1工作于定时器方式
TMR1L=(65536-12500)%256;  //定时12500个时钟
TMR1H=(65536-12500)/256;
GIE=1;    //总中断允许
PEIE=1; //外围功能模块中断允许
TMR1IE=1;  //TMR1中断允许
TMR1ON=1;  //启动TMR1
while(1)
{
         disp_1602(0,0,"Time:",5);//第一行显示temp:
         delayms(20);
         LCD_WRITE(0x80+5,0); //写地址命令
         LCD_WRITE(shi/10+0x30,1);//写数据
         LCD_WRITE(shi%10+0x30,1);//写数据
         LCD_WRITE(':',1);//写数据
         LCD_WRITE(fen/10+0x30,1);//写数据
         LCD_WRITE(fen%10+0x30,1);//写数据
         LCD_WRITE(':',1);//写数据
         LCD_WRITE(miao/10+0x30,1);//写数据
         LCD_WRITE(miao%10+0x30,1);//写数据
}
}
//*********************中断服务程序******************
void interrupt isr(void)
{
  if(TMR1IE&&TMR1IF)    //判断是否为TMR1中断
  {
TMR1L=(65536-12500)%256;
TMR1H=(65536-12500)/256;

TMR1IF=0;          //清TMR1中断标志位(必须用软件清零)
count++;
if(count==10)
{
      count=0;
      miao++;
      if(miao==60)
      {
         miao=0;
         fen++;
         if(fen==60)
         {
            fen=0;
            shi++;
            if(shi==24)
                  shi=0;
         }
      }
}
  }
}