lcd1602.txt

改程序用单片机实现了倒计时功能,并通过LCD1602显示出,

#include "at89x51.h"
//***********************************
#ifndef  __LCD1602_H__
#define  _LCD1602_H__
#define  MSB     0x80
#define  LSB     0x00
#define  TRUE    1
#define  FALSE   0
#define  HIGH    1
#define  LOW     0
//*****************************************
#define  LINE1     0
#define  LINE2     1
#define  LINE1_HEAD     0x80
#define  LINE2_HEAD     0xC0
#define  DATA_MODE     0x38
#define  OPEN_SCREEN   0x0C
#define  DISPLAY_ADDRESS    0x80
#define  CLEARSCREEN      LCD_en_com(0x01)
//*************************************************************
#define  LCDIO     P0
sbit LCD1602_RS=P2^0;   //data command select  1 data  0 command  pin 4 
sbit LCD1602_RW=P2^1;   //read write select   1 read   0 write     pin 5
sbit LCD1602_EN=P2^2;   //LCD enable signal             pin 6
//**********************************************************************
//*****************************************************************
//define time
unsigned char hour_set=00,min_set=00,sec_set=59;
unsigned char hour_backup,min_backup,sec_backup;
unsigned char day;
unsigned char p=0; 
unsigned char key_p;
#endif
void LCD_Read_BF(void)
{
unsigned char read=0; 
unsigned int i=0;
LCD1602_RS = LOW ；//RS 0
LCD1602_RW = HIGH; //RW 1
LCD1602_EN = HIGH; //EN 1 Read BF
 LCDIO = 0xFF;
LCDIO = 0xFF;
do{i++;
read = LCDIO;
if(i>1000)break;
}while(read&MSB);
}
//*************************************
void LCD_en_com(unsigned char command)
{
LCD_Read_BF(); 
 LCD1602_RS = LOW;   	//RS 0 
LCD1602_RW = LOW;		//RW 0 
 LCD1602_EN = HIGH;	//EN  Write command
 LCDIO = command;
 LCD1602_EN = LOW;
}
//*********************************
void LCD_en_dat(unsigned char dat)
{
LCD_Read_BF();
LCD1602_RS = HIGH;	//RS 1 
LCD1602_RW = LOW;		//RW 0 
LCD1602_EN = HIGH;	//EN __	Write data
LCDIO = dat;
LCD1602_EN = LOW;
}
//**********************************************
void LCD_set_xy(unsigned char x,unsigned char y)
{
unsigned char address;
if(x == LINE1)	
address = LINE1_HEAD + y;
else 
address = LINE2_HEAD + y;
LCD_en_com(address);     
}
//****************************************************************
//*********************************************************************
void LCD_write_string(unsigned char x,unsigned char y,unsigned char *s)
{
LCD_set_xy(x,y); 
while(*s)  
{
//LCDIO = *s;
LCD_en_dat(*s);   
s++;
}
}
//****************/*********************
void LCD_init(void)
{ 
LCD_en_com(DATA_MODE);
//set 8 bit data transmission mode 
LCD_en_com(OPEN_SCREEN);
//open display (enable lcd display)
LCD_en_com(DISPLAY_ADDRESS);
//set lcd first display address 
CLEARSCREEN;
//clear screen
}
//**************************************
void Delay(unsigned int count) 
{ 
  unsigned char i; 
  while(--count != 0)  
    { 
    for(i = 0; i < 125; i++); 
  } 
} 
void time(unsigned char hour,unsigned min,unsigned sec)
{
LCD_set_xy(LINE2,5); 
LCD_en_dat(hour/10+48); 
LCD_en_dat(hour%10+48);
LCD_en_dat(58);
LCD_en_dat(min/10+48); 
LCD_en_dat(min%10+48);
LCD_en_dat(58);
LCD_en_dat(sec/10+48); 
LCD_en_dat(sec%10+48);
}
void disp_backup_set_time(unsigned char hour,unsigned min,unsigned sec)
{
LCD_set_xy(LINE1,0); 
LCD_en_dat(0);
LCD_en_dat(0);
LCD_en_dat(0);
LCD_en_dat(0);
LCD_en_dat(0);
LCD_en_dat(hour/10+48); 
LCD_en_dat(hour%10+48);
LCD_en_dat(58);
LCD_en_dat(min/10+48); 
LCD_en_dat(min%10+48);
LCD_en_dat(58);
LCD_en_dat(sec/10+48); 
LCD_en_dat(sec%10+48);
LCD_en_dat(0);
LCD_en_dat(0);
LCD_en_dat(0);
}
void time_int_EA()
{
EA = 1;
ET0 = 1; 
TMOD = 0x1; 
TH0=(65536-5000)/256;
TL0=(65536-5000)%256;; 
TR0 = 1; 
}
//
void delayus(unsigned char i)
{
    while(--i);
}
void arlm()
{ 
unsigned int k=0;
P1_7=0;
Delay(1000);
P1_7=1;
//*****************************************
for(k=0;k<=5000;k++){P1_6=~P1_6;delayus(25);}
hour_set=hour_backup;
min_set=min_backup;
sec_set=sec_backup;
}
//********************************************************
void key()
{
if(P1_0==0){Delay(500);key_p++;if(key_p>=5)key_p=0;}
if(P1_1==0&&key_p==1){hour_set++;if(hour_set>23)hour_set=0;Delay(200);}
if(P1_1==0&&key_p==2){min_set++;if(min_set>=59)min_set=0;Delay(200);}
if(P1_1==0&&key_p==3){sec_set++;if(sec_set>=59)sec_set=0;Delay(200);}
if(P1_2==0&&key_p==1){hour_set--;if(hour_set>23)hour_set=0;Delay(200);}
if(P1_2==0&&key_p==2){min_set--;if(min_set<=0)min_set=59;Delay(200);}
if(P1_2==0&&key_p==3){sec_set--;if(sec_set<=0)sec_set=59;Delay(200);}
}
void main(void)
{  
   time_int_EA();
   Delay(1000);
LCD_init(); 
hour_backup=hour_set; 
min_backup=min_set;
sec_backup=sec_set;
P1_7=1;
while(TRUE )    
{
if(key_p==0)
{ 
if(!(sec_set%9))LCD_write_string(LINE1,0,"Welcome pourtime" );
       if(!(sec_set%7)){disp_backup_set_time(hour_backup,min_backup,sec_backup);}
  LCD_write_string(LINE2,0,"Run:");
  }
  else
{
  LCD_write_string(LINE2,0,"Paus");
  if(key_p==1){LCD_write_string(LINE1,0,"     MM         " );}
  if(key_p==2){LCD_write_string(LINE1,0,"        MM      " );}
  if(key_p==3){LCD_write_string(LINE1,0,"           MM   " );}
if(key_p==4)
  {
LCD_write_string(LINE1,0,"SAVE:TIME       " );
hour_backup=hour_set;
min_backup=min_set;
sec_backup=sec_set;
  }
  }
time(hour_set,min_set,sec_set); 
}
}
void disp_Time0(void) interrupt 1 using 3
{
TH0=(65536-5000)/256;
DUFAULT;; 
p++;
if(key_p==0){
if(p>=200){p=0;sec_set--;}
if(!(hour_set==0&&min_set==0&&sec_set==0))if(sec_set<=0){sec_set=59;if(!(hour_set==0&&min_set==0))min_set--;}
if(!(hour_set==0))if(min_set<=0){min_set=59;hour_set--;}
if(hour_set==0&&min_set==0&&sec_set==0)arlm();
}
key();
}