lcd._h

Proteus与AVR应用实例,对初学者很有帮助。

/*---------------------------------------------------------
液晶LCD1602C  使用4条数据线(D4~D7)
编译器：ICC-AVR v6.31A 日期: 2005-11-24 20:29:57
目标芯片 : M16
时钟: 8.0000Mhz
作者：archeng504
-----------------------------------------------------------*/
#ifndef __lcd_h
#define __lcd_h
/*-------------------------------------------------------------
LCD引脚定义
1---GND 
2---VCC
3---VO
4---RS
5---RW
6---EN
7到14--D0-D7
15--背景灯+
16--背景灯-
-----------------------------------------------------------------*/
#include <iom16v.h>
#include <macros.h>
#include <delay.h>
/*---------------------------------------------------------------
下面是AVR与LCD连接信息
PC2 ->RS
PC3 ->EN
地  ->RW
PC4 ->D4
PC5 ->D5
PC6 ->D6
PC7 ->D7
要使用本驱动，改变下面配置信息即可
-----------------------------------------------------------------*/
#define LCD_EN_PORT    PORTC   //以下2个要设为同一个口
#define LCD_EN_DDR     DDRC
#define LCD_RS_PORT    PORTC   //以下2个要设为同一个口
#define LCD_RS_DDR     DDRC
#define LCD_DATA_PORT  PORTC   //以下3个要设为同一个口
#define LCD_DATA_DDR   DDRC    //一定要用高4位
#define LCD_DATA_PIN   PINC
#define LCD_RS         (1<<PC0) //0x04   portC2       out
#define LCD_EN         (1<<PC1) //0x08   portC3       out
#define LCD_DATA       ((1<<PC2)|(1<<PC3)|(1<<PC4)|(1<<PC5)) //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);
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);
}
  
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) //列x=0~15,行y=0,1
{
    LCD_set_xy( X, Y ); //写地址    
    while (*s)  // 写显示字符
    {
      LCD_write_data( *s );
      s ++;
    }
      
}

void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data) //列x=0~15,行y=0,1
{
  LCD_set_xy( X, Y ); //写地址
  LCD_write_data( data);
  
}
#endif