原创 h1602c液晶显示函数

/*************************************************************************************
项           目:        1602液晶显示实验
编   译      器:        AVR Studio_4.12sp4+winAVR412
目  标   芯  片:        ATmega16
时           钟:        内部RC 8000000hz
建  立  日   期:        2006-11-12
最 后 修改 日期:       
*****************************************************************************************/
/*---------------------------------------------------------------------------------------
LCD引脚定义
------------------------------------------------------------------------------------------
1602pin 1    2   3    4   5    6     7   8    9    10    11    12    13    14   15   16
        地  Vcc  VL   Rs  Rw   En   D0   D1   D2   D3    D4    D5    D6    D7   灯+  灯-
                      |   |    |                          |     |     |    |
M16                  PA1  PA2  PA3                       PA4    PA5    PA6  PA7 

*****************************************************************************************/
/*------------------------------------------------------------------------------------------
头文件
------------------------------------------------------------------------------------------*/

#include               
/*-----------------------------------------------------------------------------------------
管脚宏定义
------------------------------------------------------------------------------------------*/
#define LCD_EN_PORT    PORTA  
#define LCD_EN_DDR     DDRA
#define LCD_RW_PORT    PORTA
#define LCD_RW_DDR     DDRA
#define LCD_RS_PORT    PORTA  
#define LCD_RS_DDR     DDRA
#define LCD_DATA_PORT  PORTA  
#define LCD_DATA_DDR   DDRA    
#define LCD_DATA_PIN   PINA
#define LCD_RS         (1<#define LCD_RW         (1<#define LCD_EN         (1<#define LCD_DATA       ((1<#define LCD_BUSY       (1</*--------------------------------------------------------------------------------------------
函数说明
---------------------------------------------------------------------------------------------*/
void LCD_init(void);
void LCD_en_write(void);
void LCD_wait_Ready(void);
void LCD_write_command(unsigned char command,unsigned char mang,unsigned char mingdata);
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);
/*-------------------------------------------------------------------------------------------
延时函数
----------------------------------------------------------------------------------------------*/
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();
  }
/*----------------------------------------------------------------------------------------------
液晶使能
-----------------------------------------------------------------------------------------------*/
void LCD_en_write(void)  
{
  LCD_EN_PORT|=LCD_EN;                          //EN=1
  delay_nus(1);  
  LCD_EN_PORT&=~LCD_EN;                          //EN=0
}
/*---------------------------------------------------------------------------------------------
测忙
---------------------------------------------------------------------------------------------*/
void LCD_wait_Ready(void)                               //等待LCD空闲
  {
    LCD_DATA_DDR&=~LCD_BUSY;                               //忙位设置为输入
    LCD_RW_PORT|=LCD_RW;                                 //RW=1
    LCD_RS_PORT&=~LCD_RS;                                  //RS=0
    LCD_EN_PORT|=LCD_EN;                                  //EN=1                        
    while(!( LCD_DATA_PIN&LCD_BUSY)==0);                 //读忙位，为0表示空闲；
    LCD_EN_PORT&=~LCD_EN;                                //EN=0
    LCD_DATA_DDR|=LCD_BUSY;                             //数据口方向为输出         
  }
/*---------------------------------------------------------------------------------------------
写指令或数据
-----------------------------------------------------------------------------------------------*/
void LCD_write_command(unsigned char command,unsigned char mang,unsigned char mingdata) 
   {
  
     if(mang==1)LCD_wait_Ready();                           //检测是否测忙！
        if(mingdata==1)LCD_RS_PORT&=~LCD_RS;              //RS=0 //判断是数据还是命令
           else LCD_RS_PORT|=LCD_RS;                 //RS=1
                      LCD_RW_PORT &=~LCD_RW;                 //RW=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();   
    }
/*----------------------------------------------------------------------------------------------
液晶初始化
-----------------------------------------------------------------------------------------------*/
void LCD_init(void)         
{
  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_RW_DDR|=LCD_RW;
  delay_nms(15);                          //初始化三次
  LCD_write_command(0x28,0,1);           
  delay_nms(5);
  LCD_write_command(0x28,0,1); 
  delay_nms(5);
  LCD_write_command(0x28,1,1);           //4位显示
  LCD_write_command(0x0c,1,1);            //显示开
  LCD_write_command(0x06,1,1);
  LCD_write_command(0x01,1,1);            //清屏 
}
/*------------------------------------------------------------------------------------------------
写地址
-----------------------------------------------------------------------------------------------------*/
void LCD_set_xy( unsigned char x, unsigned char y )  
{
    unsigned char address;
    if (y ==0) address =0x80 + x;
    else   address = 0xc0 + x;
    LCD_write_command(address,1,1);
}
/*-----------------------------------------------------------------------------------------------------
英文字符串写入函数
-----------------------------------------------------------------------------------------------------*/
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_command(*s,1,0);
                s ++;
          }   
   }
/*-----------------------------------------------------------------------------------------------------
单个字符写入函数
--------------------------------------------------------------------------------------------------------*/
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_command( data,1,0);   
    }
/****************************************************************************************************
主函数
*********************************************************************************************************/
int main(void)
{
      unsigned char  j;
       LCD_init();
    while(1)                                                  //循环
       {
     LCD_write_command(0x01,1,1);                    //清屏
     LCD_write_string(15,0,"WOXIAN ");             //第一行显示
        LCD_write_string(15,1,"ThankS");            //第二行显示
     delay_nms(500);
     for(j=0;j<22;j++)                                 //向左移动16 格
            {
   if(j==10)
   {
           LCD_write_command(0x08,1,1);
            delay_nms(100);
   LCD_write_command(0x0c,1,1);
   delay_nms(200);
   }

                LCD_write_command(0x18,1,1);                        //字符同时左移一格
                 delay_nms(250);                                      //控制移动时间
              }
       }
}