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📄 nf.c

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      (nf_parity_bit == NF_ODD) ? ((Byte*)&nf_current_physical_sector_addr_odd)[3]++  :  
                                  ((Byte*)&nf_current_physical_sector_addr_even)[3]++ ;
      nf_parity_bit = ~nf_parity_bit;                     /* change slot                        */
      nf_busy = TRUE;                                     /* Force read open command            */
    }
  }
  return b;
}


/*F**************************************************************************
* NAME: nf_read_sector
*----------------------------------------------------------------------------
* PARAMS:
*   nb_sector:  number of contiguous sector to read 
*   global:     gl_ptr_mem
*
* return: OK read done
*         KO read failure
*----------------------------------------------------------------------------
* PURPOSE: 
*   This function is an optimized function that writes nb-sector * 512 bytes
*   from NF to USB controller 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*   nb_sector always >= 1, can not be zero
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit nf_read_sector(Uint16 nb_sector)
{
Byte i;
bit   begin_ping_pong;

  begin_ping_pong = TRUE;
  do
  {
    if (nf_busy)                       
    {
      if (nf_parity_bit == NF_ODD)
      {
        Nf_active_ODD();
        Nf_wait_busy_odd();
        Nf_send_command_odd(NF_READ_CMD);
        Nf_send_address_odd( 0x00);
        Nf_send_address_odd( ((Byte*)&gl_cpt_page)[0]);
        Nf_send_address_odd( ((Byte*)&nf_current_physical_sector_addr_odd)[3]);
        Nf_send_address_odd( ((Byte*)&nf_current_physical_sector_addr_odd)[2]);
        if (NF_5_CYCLE_ADDRESS_BIT)                                             /* Size of card >= 128Mbytes ?  */
          Nf_send_address_odd ( ((Byte*)&nf_current_physical_sector_addr_odd)[1] ); /* Row address Byte 2           */
        Nf_send_command_odd(NF_READ_CMD2);
        Nf_wait_busy_odd(); 
      }
      else
      {
        Nf_active_EVEN();
        Nf_wait_busy_even();
        Nf_send_command_even(NF_READ_CMD);
        Nf_send_address_even( 0x00);
        Nf_send_address_even( ((Byte*)&gl_cpt_page)[0]);
        Nf_send_address_even( ((Byte*)&nf_current_physical_sector_addr_even)[3]);
        Nf_send_address_even( ((Byte*)&nf_current_physical_sector_addr_even)[2]);
        if (NF_5_CYCLE_ADDRESS_BIT)                                             /* Size of card >= 128Mbytes ?  */
          Nf_send_address_even ( ((Byte*)&nf_current_physical_sector_addr_even)[1] ); /* Row address Byte 2           */
        Nf_send_command_even(NF_READ_CMD2);
        Nf_wait_busy_even();
      }
      nf_busy = FALSE;
    }

    if (nf_parity_bit == NF_ODD)
    {
      for (i = 8; i != 0; i--)
      {
        Usb_write_byte(Nf_rd_byte_odd());    /* read 64 bytes from card */
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        Usb_write_byte(Nf_rd_byte_odd());
        if (begin_ping_pong)
        {
          begin_ping_pong = FALSE;
        }
        else
        {
          while (!Usb_tx_complete());         /* wait end of transfer */
          Usb_clear_TXCMPL();                 /* ack transfer */
        }
        Usb_set_TXRDY();                      /* start usb transfer */    

      }
    }
    else
    {
      for (i = 8; i != 0; i--)
      {
        Usb_write_byte(Nf_rd_byte_even());    /* read 64 bytes from card */
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        Usb_write_byte(Nf_rd_byte_even());
        if (begin_ping_pong)
        {
          begin_ping_pong = FALSE;
        }
        else
        {
          while (!Usb_tx_complete());         /* wait end of transfer */
          Usb_clear_TXCMPL();                 /* ack transfer         */
        }
        Usb_set_TXRDY();                      /* start usb transfer   */    
      }
    }

    ((Byte*)&gl_cpt_page)[0] += 2;

    if ( ((Byte*)&gl_cpt_page)[0] == 0x08)        /* Detection of the end of data page */
    {
      nf_busy = TRUE;
      gl_ptr_mem++;                               /* new page          */
     
      if ( !(((Byte*)&gl_ptr_mem)[3] & 0x7F) )    /* New block ? */
      {
        nf_read_open(gl_ptr_mem << 2);
      }
      else
      {
        if (nf_parity_bit == NF_ODD)
        {
          ((Byte*)&nf_current_physical_sector_addr_odd)[3]++;        
        }
        else
        {
          ((Byte*)&nf_current_physical_sector_addr_even)[3]++;
        }        
        nf_parity_bit = ~nf_parity_bit;
        ((Byte*)&gl_cpt_page)[0] = 0;
      }
    }
    ((Byte*)&nb_sector)[1]--;
  }
  while (((Byte*)&nb_sector)[1] != 0);
  while (!Usb_tx_complete());                   /* wait end of last transfer */
  Usb_clear_TXCMPL();                           /* ack transfer */
  return OK;
}


/*F**************************************************************************
* NAME: invert_nf_block
*----------------------------------------------------------------------------
* PARAMS:
*   
*
* return: 
*         
*----------------------------------------------------------------------------
* PURPOSE: 
*   This function invert assigned and free physical block 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*   
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
void invert_nf_block(void)
{
  nf_busy = FALSE;
  
  if (nf_block_used)                      /* If previous block have to de deleted */  
  {
    nf_parity_bit = NF_EVEN;
    nf_block_erase((Uint32)(nf_block_to_be_deleted_even) << NF_SHIFT_SECTOR_BLOCK);
    nf_parity_bit = NF_ODD;
    nf_block_erase((Uint32)(nf_block_to_be_deleted_odd)  << NF_SHIFT_SECTOR_BLOCK);
  }
  nf_gl_buf_idx++;                        /* increase the main buffer index */
  if (nf_gl_buf_idx >= nf_block_max)      /* if zone change */
  {
    nf_write_open(gl_ptr_mem << 2);
  }
  else
  {
    
    if ( !(nf_buf[nf_gl_buf_idx].even.w & 0x8000))  /* if block already assigned */               
    {     
      if ((nf_buf_free[gl_buf_free_idx].even & 0x7FFF) == nf_lut_block[nf_zone])
      {
        gl_buf_free_idx++;
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