液晶為啥不顯示，單片機(jī)程序調(diào)試能運(yùn)行

ID:40039 · 發(fā)表于 2023-6-23 18:31

#include<reg51.h>
#include<intrins.h>  //包含_nop_()空函數(shù)指令
#define out P2  //P2口輸出顯示
#define uchar unsigned char
#define uint unsigned int

sbit RS=P3^0;
sbit RW=P3^1;
sbit E=P3^2;

void lcd_initial(void);  //lcd初始化函數(shù)
void cheek_busy(void);  //檢查忙標(biāo)志函數(shù)
void write_command(uchar com);  //寫命令函數(shù)
void write_data(uchar dat);  //寫數(shù)據(jù)函數(shù)
void string(uchar ad,uchar *s);  //顯示字符函數(shù)
void delay(uint);  //延時(shí)函數(shù)

void main(void)
{
      lcd_initial();
      while(1)
      {
            string(0x85,"welcome");  //調(diào)用函數(shù)顯示字符
//             string(0xc2,"harbin CHINA");
            delay(100);
            write_command(0x01);  //調(diào)用寫命令函數(shù)清屏
            delay(100);
      }
}

void delay(uint j)  //延時(shí)函數(shù)
{
      uchar i=250;
      for(;j>0;j--)
      {
            while(--i);
            i=249;
            while(--i);
            i=250;
      }
}

void cheek_busy(void)  //檢查忙標(biāo)志函數(shù)
{
      uchar dt;

      do
      {
            dt=0xff;
            E=0;
            RS=0;  //RS=1選擇數(shù)據(jù)寄存器，RS=0選擇指令寄存器
            RW=1;  //RW=1進(jìn)行讀操作，RW=0進(jìn)行寫操作
            E=1;  //下降沿使能
            dt=out;
      }while(dt&0x80);
      E=0;
}

void write_command(uchar com)  //寫命令函數(shù)
{
      cheek_busy();
      E=0;
      RS=0;
      RW=0;
      out=com;
      E=1;
      _nop_();
      E=0;
      delay(1);
}

void wirte_data(uchar dat)  //寫顯示函數(shù)
{
      cheek_busy();
      E=0;
      RS=1;
      RW=0;
      out=dat;
      _nop_();
      _nop_();
      _nop_();
      _nop_();
      E=1;
      _nop_();
      _nop_();
      _nop_();
      _nop_();
      E=0;
      delay(1);
}

void lcd_initial(void)  //LCD初始化函數(shù)
{
      delay(15);
      write_command(0x38);
      delay(5);
      write_command(0x38);
      delay(5);
      write_command(0x38);
      delay(5);
      write_command(0x0c);
      delay(5);
      write_command(0x06);
      write_command(0x01);
      delay(1);
}

void string(uchar ad,uchar *s)  //輸出顯示字符串函數(shù)
{
      write_command(ad);
      while(*s>0)
      {
            write_data(*s++);
            delay(100);
      }

}