lcdtest.c

作为LCD显示的 AVR开发学习源码

#include <iom16v.h>
#include <macros.h>

#define		Enableon			PORTB |=BIT(3);			//EN
#define		Enableoff			PORTB &=~BIT(3);
#define		Dion			PORTB |=BIT(5);		  	    //DI
#define		Dioff			PORTB &=~BIT(5);
#define		RWon			PORTB |=BIT(4);		 		//RW
#define		RWoff			PORTB &=~BIT(4);




extern const unsigned char dis1[] = {"AVR Demo Board"};
extern const unsigned char dis2[] = {"[e-mail]"};


void delay(unsigned char ms)
{							// 延时子程序
	int i;
	while(ms--)
	{
		for(i = 0; i< 250; i++)
		{
		 	NOP();
			NOP();
			NOP();
			NOP();
		}
	}
}



void LCD_wait(void)   	 	    //等待LCD空闲
{
DDRC=0x00;
Dioff;
RWon;
DDRC=0x00;
NOP();
Enableon;
while(PINC&0x80);
Enableoff;
DDRC=0xff;		 				//output
}

void write_command(unsigned char cmd)  		   	//写指令使能
{ 
LCD_wait();
Dioff;
RWoff;
Enableoff;
NOP();
Enableon;
PORTC=cmd;
Enableoff;
}


void lcd_pos(unsigned char pos)
{							//设定显示位置
	write_command(pos | 0x80);
}


void write_data(unsigned char dat)				
{
LCD_wait();
Dion;
RWoff;
Enableoff;
NOP();
Enableon;
PORTC=dat;
Enableoff;
}


void lcd_init(void)
{		
	delay(15);					//LCD初始化设定
	write_command(0x38);			//
	delay(100);
	write_command(0x01);			//清除LCD的显示内容
	write_command(0x06);			//
	write_command(0x0c);			//
}


void main(void)
{
	char i;
	DDRC=0xff;
	DDRB=0xff;
	lcd_init();				// 初始化LCD			
	delay(100);
	lcd_pos(1);				// 设置显示位置
	i = 0;
	while(1){
	
	while(dis1[i] != '\0')
	{						// 显示字符
		write_data(dis1[i]);
		i++;
	}
	lcd_pos(0x41);			// 设置显示位置
	i = 0;
	while(dis2[i] != '\0')
	{
		write_data(dis2[i]);	// 显示字符
		i++;
	}
	}
	
}