AVR六个IO口驱动液晶LCD1602

//LCD1602.h

/*---------------------------------------------------------------
要使用本驱动，改变下面配置信息即可

注意:RW要接地
-----------------------------------------------------------------*/
#define LCD_EN_PORT PORTD//以下2个要设为同一个口
#define LCD_EN_DDR DDRD
#define LCD_RS_PORT PORTD//以下2个要设为同一个口
#define LCD_RS_DDR DDRD
#define LCD_DATA_PORT PORTD//以下3个要设为同一个口
#define LCD_DATA_DDR DDRD//一定要用高4位
#define LCD_DATA_PIN PIND
#define LCD_RS (1<<0)//0x04 portd2 out
#define LCD_EN (1<<2)//0x08 portd3 out
#define LCD_DATA ((1<<4)|(1<<5)|(1<<6)|(1<<7))//0xf0 portd4/5/6/7 out
/*-------------------------------------------------------------------------------
函数说明
------------------------------------------------------------------------------*/
void LCD_init(void);
void LCD_en_write(void);
void LCD_write_command(unsigned char command) ;
void LCD_write_data(unsigned char data);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data);
void delay_nus(unsigned int n);
void delay_nms(unsigned int n);

//LCD1602.c

#include
#include
#include"LCD1602.h"

void delay_1us(void)//1us延时函数
{
asm("nop");
}

void delay_nus(unsigned int n)//N us延时函数
{
unsigned int i=0;
for (i=0;i delay_1us();
}

void delay_1ms(void)//1ms延时函数
{
unsigned int i;
for (i=0;i<1140;i++);
}

void delay_nms(unsigned int n)//N ms延时函数
{
unsigned int i=0;
for (i=0;i delay_1ms();
}

/*----------------------------------------------------------------------------*/
void LCD_init(void)//液晶初始化
{
LCD_DATA_DDR|=LCD_DATA;//数据口方向为输出
LCD_EN_DDR|=LCD_EN;//设置EN方向为输出
LCD_RS_DDR|=LCD_RS;//设置RS方向为输出
LCD_write_command(0x28);
LCD_en_write();
delay_nus(40);
LCD_write_command(0x28);//4位显示
LCD_write_command(0x0c);//显示开
LCD_write_command(0x01);//清屏
delay_nms(2);
}

/*----------------------------------------------------------------------------*/
void LCD_en_write(void)//液晶使能
{
LCD_EN_PORT|=LCD_EN;
delay_nus(1);
LCD_EN_PORT&=~LCD_EN;
}

/*----------------------------------------------------------------------------*/
void LCD_write_command(unsigned char command)//写指令
{
delay_nus(16);
LCD_RS_PORT&=~LCD_RS;//RS=0
LCD_DATA_PORT&=0X0f;//清高四位
LCD_DATA_PORT|=command&0xf0;//写高四位
LCD_en_write();
command=command<<4;//低四位移到高四位
LCD_DATA_PORT&=0x0f;//清高四位
LCD_DATA_PORT|=command&0xf0;//写低四位
LCD_en_write();

}
/*----------------------------------------------------------------------------*/
void LCD_write_data(unsigned char data)//写数据
{
delay_nus(16);
LCD_RS_PORT|=LCD_RS;//RS=1
LCD_DATA_PORT&=0X0f;//清高四位
LCD_DATA_PORT|=data&0xf0;//写高四位
LCD_en_write();
data=data<<4;//低四位移到高四位
LCD_DATA_PORT&=0X0f;//清高四位
LCD_DATA_PORT|=data&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_command( address);
}
/*----------------------------------------------------------------------------*/

//列x=0~15,行y=0,1
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_data( *s );
s ++;
}

}

/*----------------------------------------------------------------------------*/

//列x=0~15,行y=0,1
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data)

{
LCD_set_xy( X, Y );//写地址
LCD_write_data( data);

}

//main.c

#include
#include
#include"LCD1602.h"

void main(void)
{
LCD_init();
// X Y *s
LCD_write_string(2, 0, "hello!!");
while(1)
{
// X Y *s
LCD_write_string(2, 1,"1234567890");
// X Y data
LCD_write_char(12, 0, 8);
LCD_write_char(13, 0, 8);
}

}