可用的lcd6线法.txt

基于ATMEGA16和DDS的信号发生器的代码

/*-------------------------------------------------------
作者:陈晓涛
日期:2007 07 27
名称:1602液晶六线接法驱动程序
功能:调用showchar()与showstring()两个函数可写字符或字符串
描述:RW接低电平,EN和RS为控制口 数据线只用到D7-D4 
-------------------------------------------------------*/
#include <iom16.h>
#include <intrinsics.h>
#define LCD_EN_PORT    PORTD
#define LCD_RW_PORT    PORTD
#define LCD_RS_PORT    PORTD
#define LCD_CON_DDR    DDRD
#define LCD_DATA_PORT  PORTA
#define LCD_DATA_DDR   DDRA
#define LCD_DATA_PIN   PINA
#define LCD_EN         0x10   //portd4   out
#define LCD_RS         0x40   //portd6   out
#define LCD_RW         0X20   //portd5   out
#define LCD_DATA       0xf0   //porta4/5/6/7 out 这里若要改用低四位则须改写程序的相应内容

/*--------------------------------------------------------------------------------------------------
Public function prototypes
--------------------------------------------------------------------------------------------------*/
void LCD_IO_init(void);
void LCD_init         (void);
void LCD_en_write     (void);
void LCD_write_char   (unsigned command,unsigned data);
void LCD_set_xy       (unsigned char x, unsigned char y);
void showchar(unsigned char X,unsigned char Y,unsigned char s);//显示字符子函数
void showstring(unsigned char X,unsigned char Y,unsigned char *s);//显示字符串子函数
void delay_nus        (unsigned int n);
void delay_nms        (unsigned int n);

void LCD_IO_init(void)
{
LCD_DATA_DDR|=LCD_DATA;   // 数据为输出
LCD_CON_DDR|=LCD_RS|LCD_EN|LCD_RW ;  //控制端口设置为输出
LCD_RW_PORT&=~LCD_RW;//RW置为低电平
}
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 showchar(unsigned char X,unsigned char Y,unsigned char s)
  {
    LCD_set_xy( X, Y ); //写地址
    LCD_write_char( 0, s );
  }
void showstring(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();
  }
}
void main(void)
{
     LCD_IO_init();
     LCD_init();
     for(;;)    //for循环
       {
	 //LCD_write_char(0x01,0);
	 //delay_nms(2);
         showchar(0,1,'A');
         __delay_cycles(1000000);
         showstring(0,0,"GOODLUCK TO HDU!!");
         __delay_cycles(1000000);
         showstring(0,0,"WELCOME TO HDU!!");
         __delay_cycles(1000000);
         showstring(0,1,"www.OURAVR.com!");
         __delay_cycles(1000000);
         showstring(0,0,"happy new year!");
         __delay_cycles(1000000);
         //showstring(0,1,"amork:everfriend");
         //__delay_cycles(1000000);
         showstring(0,0,"                ");
         __delay_cycles(1000000);
         showstring(0,1,"                ");
         __delay_cycles(1000000);
       }
}
   /*-----------------------------------------------------------------------
延时函数
系统时钟：8M
-----------------------------------------------------------------------*/
void delay_1us(void)                 //1us延时函数
  {
   __delay_cycles(1);
  }

void delay_nus(unsigned int n)       //N us延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1us();
  }
  
void delay_1ms(void)                 //1ms延时函数
  {
   __delay_cycles(1000);
  }
  
void delay_nms(unsigned int n)       //N ms延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1ms();
  }