HD44780读写单片机C51程序免费下载

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描述

  下面我给大家介绍一个HD44780读写单片机c51程序

  #include 《reg51.h》

  #include 《intrins.h》

  sbit GND_LCD=P1^7;

  sbit rs=P1^0;

  sbit rw=P1^1;

  sbit e=P1^2;

  unsigned char busy(void);

  void ctrl(unsigned char);

  void wd_h(unsigned char);

  void wd_l(unsigned char);

  unsigned char rd(void);

  void write(unsigned char);

  void init(void);

  void NOP(void);

  void disp(unsigned char);

  unsigned int time;

  void int_t0 (void) interrupt 1 {

  TL0=TL0+30;TH0=0xfb;

  time++;

  }

  void wait(unsigned int w){

  time=0;

  while (time《w) {}

  }

  void init(void) {

  unsigned char i;

  P1=0;

  for (i=0;i《2;i++) {

  wd_l(0x30);

  wait(5);

  }

  wd_h(0x20);

  ctrl(0x28);

  ctrl(0x8);

  ctrl(3);

  ctrl(6);

  disp(0);

  ctrl(1);

  ctrl(8);

  ctrl(0xe);

  ctrl(0x80);

  }

  unsigned char busy(void){

  P1=0;

  return(rd());

  }

  unsigned char rd(void) {

  unsigned char dat0,dat1;

  rw=1;

  rs=0;

  P1=P1|0x78;

  e=1;

  dat0=P1;

  e=0;

  e=1;

  dat1=P1;

  P1=0;

  return(((dat0《《1)&0xf0) | ((dat1》》3)&0xf) );

  }

  void ctrl(unsigned char dat){

  while (busy()》0x7f) {};

  rw=rs=0;

  wd_h(dat);

  wd_l(dat);

  }

  void wd_h(unsigned char dat){

  e=1;

  P1=P1|((dat&0xf0)》》1);

  e=0;

  P1=P1&0x87;

  }

  void wd_l(unsigned char dat){

  e=1;

  P1=P1|((dat&0xf)《《3);

  e=0;

  P1=0;

  }

  void write(unsigned char dat) {

  while (busy()》0x7f) {};

  rw=0;

  rs=1;

  wd_h(dat);

  wd_l(dat);

  }

  //===============HD44780读写程序====================================

  void disp(unsigned char i) {

  unsigned char j;

  ctrl(1);

  ctrl(0x80);

  for (j=0;j《6;j++) write(d[i][j]);

  write(‘ ’);

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