Dspic30f6014a LCD block display

void lcd_test00(void)
{
 unsigned char i,page;
 CSA=0;CSB=0;//left block
 Nop();
 write_com(0xc0);
 for(page=0xb8;page<0xb8+8;page++)
 {
  write_com(page);
  write_com(0x40);
  //for()
  if((page-0xb8)%2==0)
  {
   for(i=0;i<64;i++)
    {
      if((i/8%2)==0)
        {write_data(0xff);}
      else
        {write_data(0);}
     }
  }
  else
  {
   for(i=0;i<64;i++)
    {
      if((i/8%2)==0)
        {write_data(0x0);}
      else
        {write_data(0xff);}
    }
 }

void clear_all_ram(unsigned char b)
{
 unsigned char i,page;

//--------------------------------------
 CSA=0;CSB=0;//left block
 Nop();
 write_com(0xc0);
 for(page=0xb8;page<0xc0;page++)
 {
  write_com(page);
  write_com(0x40);
  for(i=0;i<64;i++)
  {write_data(b);}
  }
 NOP();
//--------------------------------------
 CSA=0;
 Nop();Nop();Nop();Nop();Nop();
 CSB=1;//medium block
 Nop();
 write_com(0xc0);
 for(page=0xb8;page<0xc0;page++)
 {
  write_com(page);
  write_com(0x40);
  for(i=0;i<64;i++)
  {write_data(b);}
  }
 NOP();
//--------------------------------------
 CSA=1;CSB=0;//right block
 Nop();
 write_com(0xc0);
 for(page=0xb8;page<0xc0;page++)
 {
  write_com(page);
  write_com(0x40);
  for(i=0;i<64;i++)
  {write_data(b);}
  }
 NOP();
 }
void delay1s(void)
{
 unsigned int i,j;
 for(i=0;i<800;i++)
  {
   for(j=0;j<50;j++)
    {NOP();}
   }
 }