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📄 nf.c

📁 ATMEL 89c51sndc mp3外接硬盘源码
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  {
    Nf_send_command_even(NF_READ_B_AREA_CMD);            /* 2nd half page                                */
    Nf_send_address_even( (nf_logical_block & 0x3F) << 2);  /* 4Bytes for one logical block                 */
  }
  else
  {
    Nf_send_command_even(NF_READ_A_AREA_CMD);            /* first half page */
    Nf_send_address_even((nf_logical_block & 0x3F) << 2);
  }

  Nf_send_address_even ( ((Byte*)&gl_address)[3] );         /* 2nd address cycle         */
  Nf_send_address_even ( ((Byte*)&gl_address)[2] );         /* 3rd address cycle         */
  #if (NF_4_CYCLE_ADDRESS)                          /* Size of card >= 64Mbytes ?*/
    Nf_send_address_even ( ((Byte*)&gl_address)[1] );       /* 4th address cycle         */
 #endif 


  Nf_wait_busy_even();

  /* Read the physical block number */
  ((Byte*)&physical_block)[0] = Nf_rd_byte_even();
  ((Byte*)&physical_block)[1] = Nf_rd_byte_even();

  /* Calculate the physical sector address */
  nf_current_physical_sector_addr_even = ((Uint32)(physical_block) << 5) + ((gl_ptr_mem & 0x3F) >> 1) + (gl_ptr_mem & 0x01);
  
  
  /* Read the physical block number */
  ((Byte*)&physical_block)[0] = Nf_rd_byte_even();
  ((Byte*)&physical_block)[1] = Nf_rd_byte_even();

  /* Calculate the physical sector address */
  nf_current_physical_sector_addr_odd = ((Uint32)(physical_block) << 5) + ((gl_ptr_mem & 0x3F) >> 1); 

  if (gl_ptr_mem & 0x01)
  {
    nf_parity_bit = NF_ODD;
  }
  else
  {
    nf_parity_bit = NF_EVEN;
  }

  return OK;

 
}


/*F**************************************************************************
* NAME: nf_read_close
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   Low level memory read close
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
void nf_read_close (void)
{
}



/*F*************************************************************************
* NAME: nf_read_byte
*---------------------------------------------------------------------------
* PARAMS:
*
* return:
*   Data read from memory
*---------------------------------------------------------------------------
* PURPOSE:
*   Low level memory read function
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
****************************************************************************/
Byte nf_read_byte (void)
{
Byte b;
  

  if (!gl_cpt_page)
  {
    if (nf_parity_bit == NF_ODD)
    {
      Nf_active_ODD();
      Nf_read_open_A_area_odd(nf_current_physical_sector_addr_odd, 0x00);
      b = Nf_rd_byte_odd();

    }
    else
    {
      Nf_active_EVEN();
      Nf_read_open_A_area_even(nf_current_physical_sector_addr_even, 0x00);
      b = Nf_rd_byte_even();
    }
  }
  else
  {
    if (nf_parity_bit == NF_ODD)
      b = Nf_rd_byte_odd();
    else
      b = Nf_rd_byte_even();
  }

 
  gl_cpt_page++;
  
  /* Detection of the end of data page */
  if (gl_cpt_page == NF_DATA_SIZE)                 
  {

    gl_ptr_mem++;                           /* new page          */

    gl_cpt_page=0;                          /* start at column 0 */

    if ( !(gl_ptr_mem & 0x3F) )   /* New block ? */
    {
      nf_read_open(gl_ptr_mem);
    }
    else
    {
      nf_parity_bit = ~nf_parity_bit;
      if (nf_parity_bit == NF_ODD)
      {
        nf_current_physical_sector_addr_even++;
      }
      else
      {
        nf_current_physical_sector_addr_odd++;
      }
    }
  }
  return b;
}


/*F**************************************************************************
* NAME: nf_read_sector
*----------------------------------------------------------------------------
* PARAMS:
*   global: gl_ptr_mem
*
* return: OK read done
*         KO read failure
*----------------------------------------------------------------------------
* PURPOSE: 
*   This function is an optimized function that writes 512 bytes from NF
*   card to USB controller 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit nf_read_sector(Uint16 nb_sector)
{
Byte i;
bit bdata  begin_ping_pong = 1;

  do
  {
    if (nf_parity_bit == NF_ODD)
    {
      Nf_active_ODD();
      Nf_wait_busy_odd();
      Nf_read_open_A_area_odd(nf_current_physical_sector_addr_odd, 0x00);
      nf_current_physical_sector_addr_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
    {
      Nf_active_EVEN();
      Nf_wait_busy_even();
      Nf_read_open_A_area_even(nf_current_physical_sector_addr_even, 0x00);
      nf_current_physical_sector_addr_even++;
      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;
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