The LCD display does not display, but the program can run normally?

ayld

The LCD display does not display, but the program can run normally? [Copy link]

#include<reg51.h>
#include<intrins.h> //Include _nop_() empty function instruction
#define out P2 //P2 port output display
#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 initialization function
void cheek_busy(void); //check busy flag function
void write_command(uchar com); //write command function
void write_data(uchar dat); //write data function
void string(uchar ad,uchar *s); //display character function
void delay(uint); //delay function

void main(void)
{
lcd_initial();
while(1)
{
string(0x85,"welcome"); //Call function to display characters
string(0xc2,"harbin CHINA");
delay(100);
write_command(0x01); //Call write command function to clear screen
delay(100);
}
}

void delay(uint j) //延时函数
{
uchar i=250;
for(;j>0;j--)
{
while(--i);
i=249;
while(--i);
i=250;
}
}

void cheek_busy(void) //Check busy flag function
{
uchar dt;

do
{
dt=0xff;
E=0;
RS=0;
RW=1;
E=1;
dt=out;
}while(dt&0x80);
E=0;
}

void write_command(uchar com) //write command function
{
cheek_busy();
E=0;
RS=0;
RW=0;
out=com;
E=1;
_nop_();
E=0;
delay(1);
}

void write_data(uchar dat) //Write display function
{
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初始化函数
{
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) //output display string function
{
write_command(ad);
while(*s>0)
{
write_data(*s++);
delay(100);
}
}

ayld

The screenshot on the right has nothing to do with the previous code. It is used to check other codes. The computer has dual screens.

ayld

Problem solved.

void write_data(uchar dat) //Write display function

This function is written incorrectly.