1602.c

单片机 单片机基本功能 单片机基本功能实现

#include <at89x51.h>
#define uchar unsigned char
#define uint unsigned int
#define busy 0x80
sbit RS=P3^7;
sbit RW=P3^6;
sbit E=P3^5;
sfr lcd_data=0xa0;
void cls(void);
void uart_init();
void send_string(uchar *str);
void send_byte(uchar da);
void initlcd();
void write_data(uchar x);
void write_instruction(uchar x);
void write_string(uchar x,uchar *p);
void delay(uint i);
uchar code string_to_pc[]="字符型LCD1602和传口测试程序，请输入单个字母或数字发给我！";
uchar code sring_to_lcd[]="LCM 1602,I LOVE";

void main()
{
   uart_init();//初始化传口
   send_string(string_to_pc);//发送字符串
   send_byte(0x0d);//计算机换行
   send_byte(0x0a);
   initlcd();
   write_string(0x80,sring_to_lcd);
   while(1);
}
/************************************初始化串口******************************/
void uart_init()
{
    TMOD=0x20;
	TH1=0XFD;
	TL1=0XFD;
	PCON=0X00;
	TR1=1;
	SCON=0X50;
	IE=0x90;

}
/************************************发送一串字符*****************************/
void send_string(uchar *str)
 {
     uchar i;
	 i=0;
	 while(*(str+i)!='\0')
	 {
	   send_byte(*(str+i));
	   i++;
	 }
 }
/************************************发送单个字符******************************/
void send_byte(uchar da)
{
   
   EA=0;
   SBUF=da;
   while(!TI)
    TI=0;
	EA=1;
 }

/************************************初始化LCD******************************/
void initlcd()
{
  write_instruction(0x01);
  delay(20);
  write_instruction(0x38);
  delay(20);
  write_instruction(0x0f);
  delay(20);
  write_instruction(0x06);
  delay(20);

}
/************************************写命令******************************/
void write_instruction(uchar x)
{
   delay(1000);
   E=0;
   RW=0;
   RS=0;
   lcd_data=x;
   E=1;
   delay(20);
   E=0;


}



/*void check_busy(void)
{
   lcd=0xff;
   E=0;
   RW=1;
   RS=0;
   E=1;
   delay(100);
   while(lcd&busy);
   E=0;

}
*/
/************************************延时子程序*****************************/
void delay(uint i)
{
  while(i--);

}

/************************************写数据到LCD中******************************/

void write_data(uchar x)
{
   delay(1000);
   E=0;
   RW=0;
   RS=1;
   E=1;
   lcd_data=x;
   E=0;
}

/************************************LCD清屏******************************/
void cls(void)
{
  write_instruction(0x01);
}
/************************************写字符串******************************/
void write_string(uchar x,uchar *p)
{
   write_instruction(x);
   while(*p!=0x00)
   {
     write_data(*p);
	 p++;
	 x++;
	 if(x==0x8f)
	 {
	 write_instruction(0xc0);
	 }
   }
}

/************************************串口中断******************************/
uart()interrupt 4
{
  uchar temp;
  uchar count;
  EA=0;
  if(RI)
  {
     RI=0;
	 temp=SBUF;
	 if(count==0)
	 {
	   cls();
	   send_byte(0x0d);//计算机换行
	   send_byte(0x0a);

	 }
	 write_data(temp);//写数据到LCD

	 send_byte(temp);//发送回电脑
	 count++;
	 if(count==0x10)//满一屏
	 {
	    write_instruction(0xc0);//LCD地址切换到第而行
		send_byte(0x0d);//换行
	    send_byte(0x0a);
	 }
	 if(count==0x20)
	 {
	    count=0;
	 }
  }
	EA=1;
  
}