/*LCD12864顯示子程序*、

 

#include<util/delay.h>
#define uchar unsigned char
#define uint unsigned int

#define SETLCD12864RS PORTA|=(1<<PA4)
#define SETLCD12864RW PORTA|=(1<<PA5)
#define SETLCD12864EN PORTA|=(1<<PA6)

#define CLLCD12864RS PORTA&=~(1<<PA4)
#define CLLCD12864RW PORTA&=~(1<<PA5)
#define CLTLCD12864EN PORTA&=~(1<<PA6)

#define PSB PA3

void initLCD12864_PORTX(void)
{
  PORTB =0xff;
  DDRB =0xff;
  
  PORTA =0x00;
  DDRA =(1<<PA4)|(1<<PA5)|(1<<PA6);

}
void delay_1ms(void)
{
  unsigned int i=0;
  for(i=0;i<1140;i++);
}
void delay_nms(unsigned int n)
{
  unsigned int i=0;
  for(i=0;i<n;i++)
  {
    delay_1ms();
  }
}
void LCM12864_TestBusy(void)//忙檢測子程序//
{
  unsigned int uiTemp;
          uiTemp=3000;
    DDRB =0x00;
    CLLCD12864RS;   //RS =0;讀命令//
   SETLCD12864RW;  //RW=1;讀指令//
         SETLCD12864EN;  // E=1;使能//
  while((0x80&PINB)&&(uiTemp--));  //忙信號檢測，直到忙信號為0，才能讀寫操作//
         CLTLCD12864EN;   //E=0;//
         DDRB =0xff;      //PB為輸出口，準備向端口發送數據//   
    
}

void write_cmd_12864(unsigned char LCM12864_command)//寫操作子程序//
{
  LCM12864_TestBusy();
         CLLCD12864RS;//RS=0;//
         CLLCD12864RW;//RW=0;//
         SETLCD12864EN;//E=0;//
   _delay_ms(2);
   PORTB = LCM12864_command;//向PB端口寫一個指令//
   CLTLCD12864EN;  //E=0;//
 LCM12864_TestBusy();  
}

void LCD12864Init(void)
{
 write_cmd_12864(0x01);  //清屏
 _delay_ms(15);
 write_cmd_12864(0x38);  //顯示模式 
 _delay_ms(5);
          //LCD12864WriteCommand(0x0f);  //顯示開關控制，開顯示，光標顯示，光標閃爍
 write_cmd_12864(0x0c);  //顯示開關控制，開顯示，光標不顯示，光標不閃爍
 _delay_ms(5);
 write_cmd_12864(0x06);  //光標設置，讀或寫一個字符后，地址指針加一，光標加一，整屏不移動
 _delay_ms(5);
}


void write_data_12864(unsigned char LCM12864_data)//寫涵數//
{
  LCM12864_TestBusy(); 
        SETLCD12864RS;
  CLLCD12864RW;
  SETLCD12864EN;//E=0;//
  _delay_ms(2);
  PORTB = LCM12864_data;//向PB口寫一個涵數
  CLTLCD12864EN;  //E=0;//
  LCM12864_TestBusy();
  
 
}

void LCD_set_xy( unsigned char x, unsigned char y )//初始化液晶行和例//
{
  unsigned char address;
  switch(y){
            case 0: address=0x80+x;break;//第一例//
   case 1: address=0x90+x;break;//第二例//
   case 2: address=0x88+x;break;//第三例//
   case 3: address=0x98+x;break;//第四例//
   default:address=0x80+x;//默認第一例//
   
           }
     write_cmd_12864(address);
}

void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)//X列，Y行，*S字符串//
  {
  LCD_set_xy( X, Y );
    
    while (*s) 
      {
        write_data_12864(*s );
     s ++;
  delay_nms(1);
   }
  }  
  
  
void LCD12864_write_char(unsigned char X,unsigned char Y,unsigned char data)//X列，Y行，涵數//
{
  LCD_set_xy( X,Y );
  write_data_12864(data);
}

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