lcd.c

户外显示屏源程序

/*********************************Copyright (c)*********************************
**                              
** 文   件   名: LCD.c
** 最后修改日期: 2005年06月8日
** 描        述: 1602液晶驱动函数
** 版	     本: V1.0
** 主  控  芯 片:M16  晶振频率:8 MHZ
*******************************************************************************/
#include <iom16v.h>
#include <macros.h>
#include "function.h"
#include "define.h"
#include "defineLCD.h"
/******************************************************************************


                               函数定义

******************************************************************************/

void LCD_init(void)       //液晶初始化
{
 delay_nms(15);
 LCD_write_char(0x28,0);  //4位显示
 LCD_write_char(0x0c,0);  //显示开
 LCD_write_char(0x01,0);  //清屏
}


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 ++;
      }
  }
 

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_en_write(void)  //液晶使能
 {
  LCD_EN_PORT|=LCD_EN;
  delay_nus(1);
  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(16);
 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();
  }
}