/*初始化*/
                   
void  ssd1315()
{
       write_i(0xAE);    /*display off*/      
       
       write_i(0x00);    /*set lower column address*/       
       write_i(0x10);    /*set higher column address*/
       
       write_i(0x40);    /*set display start line*/
       
       write_i(0xB0);    /*set page address*/
       
       write_i(0x81);    /*contract control*/
       write_i(0xb0);    /*128*/
       
       write_i(0xA1);    /*set segment remap*/

       write_i(0xA4);    
      
       write_i(0xA6);    /*normal / reverse*/
       
       write_i(0xA8);    /*multiplex ratio*/
       write_i(0x3F);    /*duty = 1/64*/
       
       write_i(0xC8);    /*Com scan direction*/
       
       write_i(0xD3);    /*set display offset*/
       write_i(0x00);
       
       write_i(0xD5);    /*set osc division*/
       write_i(0x90);    
       
       write_i(0xD9);    /*set pre-charge period*/
       write_i(0x22);
       
       write_i(0xDA);    /*set COM pins*/
       write_i(0x12);
       
        write_i(0xdb);    /*set vcomh*/
       write_i(0x30);
       
        write_i(0x8d);    /*set charge pump enable*/
       write_i(0x14);
       
       write_i(0xAF);    /*display ON*/                           

}


                   
/*副程式*/   
void write_i(unsigned char  ins)
{
  unsigned char  m,da;
  unsigned int j;
     DC=0;
     CS=0;
     da=ins;
  for(j=0;j<8;j++)
    {
      m=da;
      SCL=0;
      m=m&0x80;
      if(m==0x80)
        {
           SDA=1;
         }
       else
         {
             SDA=0;
         }
        
        da=da<<1;
        SCL=1;
      }
  CS=1;
}

void write_d(unsigned char  dat)
{
  unsigned char  m,da;
  unsigned int j;
     DC=1;
     CS=0;
     da=dat;
  for(j=0;j<8;j++)
    {
      m=da;
      SCL=0;
      m=m&0x80;
      if(m==0x80)
        {
           SDA=1;
         }
       else
         {
             SDA=0;
         }
        
        da=da<<1;
        SCL=1;
      }
  CS=1;
}

void delay(unsigned int i)							
{
   	while(i>0)
   	{
		i--;
   	}
}