/*------LCD1602定義------*/
sbit lcd_rs=P1^0;
sbit lcd_rw=P1^1;
sbit lcdEN=P1^2;

void Delay5Ms(void);
void Delay400Ms(void);
void Delay1000Ms(void);
void write_command(uchar com,uchar cy);
void write_data(uchar a);
void lcd_init();
void ePutstr(uchar x,uchar y,uchar *ptr);
void locateXY(uchar x,uchar y);
void disponechar(uchar x,uchar y,uchar wdata);
void wait_enable();

//=========================LCD1602=============================//
/*------延時函數-----*/
void Delay5Ms(void)    //5ms
{
	uint i = 5552;
	while(i--);
}
void Delay400Ms(void)  //400ms
{
	uchar i = 4;
	uint j;
	while(i--)
	{
	
        j=7269;   
		while(j--);
	}
}
void Delay1000Ms(void)  //1000Ms
{
	uchar i = 5;
	uint j;
	while(i--)
	{
	    j=18172; 
       
		while(j--);
	}
}
/*------寫命令函數------*/
void write_command(uchar com,uchar cy)
{ 
  if(cy) wait_enable();
  lcd_rs=0;
  lcd_rw=0;
  lcdEN=1;
  P0=com; 
  _nop_();_nop_();
  lcdEN=0;
}
/*------寫數據函數------*/
void write_data(uchar dat)
{
  wait_enable();
  lcd_rs=1;
  lcd_rw=0;
  lcdEN=1;
  P0=dat;
  _nop_();_nop_();
  lcdEN=0;
}
/*------初始化------*/
void lcd_init()
{
  write_command(0x38,0);
  Delay5Ms();
  write_command(0x38,1);
  write_command(0x08,1);
  write_command(0x01,1);
  write_command(0x06,1);
  write_command(0x0C,1);
}
/*------判忙使能------*/
void wait_enable()
{
  P0=0xff;
  lcd_rs=0;
  lcd_rw=1;
  lcdEN=1;
  while(P0&BUSY);
}
/*------發送字符------*/
void ePutstr(uchar x,uchar y,uchar  *ptr)
{
   uchar i,j=0;
   while(ptr[j]>31) {j++;};  //若為字符，進行計數
   for(i=0;i<j;i++){
       disponechar(x++,y,ptr[i]);
       if(x==16){
          x=0;y^=1;      //若第一行滿，換行
       }
    }
}
/*------定位輸出行------*/
void locateXY(uchar x,uchar y)
{
   uchar t;
   t=x&0xf;        //取t低四位
   y&=0x1;         
   if(y==1) t|=0x80;  //第一行顯示
   else     t|=0xC0;        //第二行顯示
   write_command(t,0);
}
/*------顯示一個字符串------*/
void disponechar(uchar x,uchar y,uchar wdata)
{
   locateXY(x,y);    //先送地址
   write_data(wdata);//再處理數據
}