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📄 nf.c

📁 c51snd1c硬盘播放器全部资料.源码.线路图.protel99se的pcb图
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  nf_parity_bit = ((Byte*)&gl_ptr_mem)[3] & 0x01;  
  
  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 (nf_busy)
  {
    nf_busy = FALSE;
    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();
      b = Nf_rd_byte_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();
      b = Nf_rd_byte_even();
    }
  }
  else
  {
    b = (nf_parity_bit == NF_ODD) ? Nf_rd_byte_odd() : Nf_rd_byte_even();
  }

  gl_cpt_page++;
  
  if ( ((Byte*)&gl_cpt_page)[0] == 0x08)                  /* Detection of the end of data page  */
  {
    gl_ptr_mem++;                                         /* new page                           */
    if ( !(((Byte*)&gl_ptr_mem)[3] & 0x7F) )              /* New block ?                        */
    {
      nf_read_open(gl_ptr_mem << 2);
    }
    else
    {
      gl_cpt_page = 0;                                    /* reset column                       */
      (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());
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