lcd1602.c

环保型IC卡门禁系统的C程序

//-----------------------------LCD1602 Function---------------------------------
#include <iom8v.h>
#include <macros.h>
#include "lcd1602.h"

void LCD_init(void)       //液晶初始化
{
 delay_nms(2);
 
 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&=0Xf0;
  LCD_DATA_PORT|=((data_temp&0xf0)>>4);  //写高四位
  LCD_en_write(); 
  LCD_DATA_PORT&=0Xf0;
  LCD_DATA_PORT|=data_temp&0x0f;   //写低四位
  LCD_en_write();
 }
 else
 {
  LCD_RS_PORT&=~LCD_RS;   //RS=0
  LCD_DATA_PORT&=0Xf0;
  LCD_DATA_PORT|=((command_temp&0xf0)>>4); //写高四位
  LCD_en_write();
  LCD_DATA_PORT&=0xf0;
  LCD_DATA_PORT|=command_temp&0x0f;  //写低四位
  LCD_en_write();
  }
}