lcd._h

来自「ICC-AVR环境,用ATmage16做的LC表」· _H 代码 · 共 87 行

#ifndef __LCD_h
#define __LCD_h

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


#define LCD_EN_PORT    PORTC
#define LCD_RW_PORT    PORTC
#define LCD_RS_PORT    PORTC
#define LCD_DATA_PORT  PORTA
#define LCD_DATA_DDR   DDRA
#define LCD_DATA_PIN   PINA
#define LCD_EN         0x02
#define LCD_RS         0x01
#define LCD_DATA       0xf0

extern void delay_nus(unsigned char n);
extern void delay_nms(unsigned char n);

void LCD_en_write(void)  //液晶使能
{
	LCD_EN_PORT|=LCD_EN;
	delay_nus(5);
	LCD_EN_PORT&=~LCD_EN;
}

void LCD_write_char(unsigned command,unsigned data) // 写数据
{
	unsigned command_temp,data_temp;
	command_temp=command;
	data_temp=data;
	delay_nus(20);
	if(command==0)
	{
		LCD_RS_PORT|=LCD_RS;  //RS=1
		LCD_DATA_PORT&=0x0f;
		LCD_DATA_PORT|=data_temp&0xf0;  //写高四位
		LCD_en_write();
		data_temp=data_temp<<4;  
		LCD_DATA_PORT&=0x0f;
		LCD_DATA_PORT|=data_temp&0xf0;   //写低四位
		LCD_en_write();
	}
	else
	{
		LCD_RS_PORT&=~LCD_RS;   //RS=0
		LCD_DATA_PORT&=0x0f;
		LCD_DATA_PORT|=command_temp&0xf0; //写高四位
		LCD_en_write();
		command_temp=command_temp<<4;
		LCD_DATA_PORT&=0x0f;
		LCD_DATA_PORT|=command_temp&0xf0;  //写低四位
		LCD_en_write();
	}
}

void LCD_set_xy( unsigned char x, unsigned char y )  //写地址函数
{
    unsigned char address;
    if (y == 0) address = 0x80 + x;
    else 
		address = 0xc0 + x;
    LCD_write_char( address, 0 );
}

void LCD_init(void)       //液晶初始化
{
	delay_nms(30);
	LCD_write_char(0x28,0);  //4位显示
	LCD_write_char(0x0c,0);  //显示开
	LCD_write_char(0x01,0);  //清屏
	delay_nms(30);
}

void LCD_write_string(unsigned char x,unsigned char y,unsigned char *s)
{
    LCD_set_xy( x, y); //写地址
	
    while (*s)  // 写显示字符
	{
        LCD_write_char(0, *s);
		s++;
	}
}

#endif