lcdqd.c

液晶显示器LCD1602的驱动。适合于51单片机系统。

#include <AT89X51.h>
#define Data P0

sbit RS=P1^7;
sbit RW=P1^6;
sbit E=P2^6;

void delay(unsigned int k) 
{ 
  unsigned int i,j; 
  for(i=k;i>0;i--) 
  for(j=50;j>0;j--) ; 
}

unsigned char ReadStatus(void)
{
  Data = 0xFF;
  RS = 0;
  RW = 1;   
  E = 1;
  while (Data & 0x80);
  return(Data);
  delay(2);
  E = 0;
}

void wr_com(unsigned char com)
{
  ReadStatus();
  Data=com;
  RS=0;
  RW=0;
  E=1;
  delay(2);
  E = 0;
 }

void wr_dat(unsigned char dat)
{
  ReadStatus();
  Data = dat;
  RS = 1;
  RW = 0;
  E = 1; 
  delay(2);
  E = 0;
}

void LCD_Init(void)
{
  Data =0x0;
  wr_com(0x38);
  delay(5);
  wr_com(0x38);
  delay(5);
  wr_com(0x38);
  delay(5);
  wr_com(0x38);
  wr_com(0x08);
  wr_com(0x01);
  wr_com(0x06);
  wr_com(0x0C);
}

void GotoXY(unsigned char x,unsigned char y)
{
  x&=0x01;
  y&=0x0F;
  y|=(x==0)?0x80:0xC0;
  wr_com(y);
  do{
      y=ReadStatus();
	  }while((y&0x80)==0x80);
   }

void disp(unsigned char x,unsigned char y,unsigned char _char)
{
  GotoXY(x,y);
  wr_dat(_char);
  }

void main(void)
{ LCD_Init();
  while(1)
 {disp(0,0,'6');
  disp(1,7,'8');}
}