8515控制液晶显示.txt

液晶19264驱动程序。显示一串字符。用AT8515L控制

#include <iom8515v.h>

 unsigned char a[] = {"WALTRON"};

void nop();
void delay(int ms );
unsigned char lcd_bz();
void lcd_wcmd(unsigned char cmd);
lcd_wdate(unsigned char date) ;
lcd_rdate(unsigned char date);
void lcd_init(); 

void main()               
{	
	 unsigned char i;
	lcd_init(); 
	delay(10);
	i = 0;
	while(a[i] != '\0')      //写显示字符串
	{
	 	lcd_wdate(a[i]);
		i++;
	}
	i =  0;
	while(a[i] != '\0')     //读显示字符串
	{
	 	lcd_rdate(a[i]);
		i++;
	}
	while(1);
	 
	 
	
}



 unsigned char lcd_bz()                //检测BUSY信号，'1'为忙
{		
	unsigned char result;
	DDRC = 0XFF;
	DDRA = 0XFF;
 	PORTC = 0X7c;
	nop();
	nop();
	result = PORTA & 0x80;
	return(result);
}



void lcd_wcmd(unsigned char cmd)    //写一个控制指令指令
{	 
	 while(lcd_bz());
	 DDRC = 0XFF;
	 DDRA = 0XFF;
 	 PORTC = 0X3c;
	 nop();
	 nop();
	 PORTA = cmd;
	 nop();
	 nop();
	 nop();
	 nop();
	 PORTC = 0X1c;
	 nop();
	 nop();
	 nop();
	 nop();
}

lcd_wdate(unsigned char date)    //写显示数据子程序
{
    while(lcd_bz());
	DDRC = 0XFF;
	DDRA = 0XFF;
	PORTC = 0Xbc;
	nop();
	nop();
	PORTA = date;
	nop();
	nop();
	nop();
	nop();
	PORTC = 0x9c;
	nop();
	nop();
	nop();
	nop();
}

lcd_rdate(unsigned char date)  //读显示数据子程序
{
 	while(lcd_bz());
	DDRC =0XFF;
	DDRA = 0XFF;
	PORTC = 0Xfc;
	nop();
	nop();
	PORTA = date;
	nop();
	nop();
	nop();
	nop();
}
void lcd_init()               //初始化
{
 	 lcd_wcmd(0x3f);   //开屏设置
	 delay(1);
	 lcd_wcmd(0xc0);   //设置起始行
	 delay(1);
	 lcd_wcmd(0xb8);   //页面设置
	 delay(1);
	 lcd_wcmd(0x40);   //列地址设置
	 delay(1);
}







void nop()               //延时一个机器周期
{
 	 int i;
	 for (i = 0 ; i < 1; i ++ );
}

void  delay(int ms )   //延时子程序
{
 	 int i;
  	 while(ms--)
	 {
	  		for(i = 0 ; i < 120 ; i ++ ) ;
			{
			 	  nop();
				  nop();
				  nop();
				  nop();
			}
	 		 
	 }
}