smc.c

ATMEL 89c51sndc mp3外接硬盘源码

            if (temp_address >= ((Uint32)(smc_zone + 1) << 15) )
                temp_address = (Uint32)(smc_zone) << 15;
            Smc_read_open_C_area(temp_address, 0x05);
            byte_5 = Smc_rd_byte();                          /* Invalid/Valid block        */
            byte_6 = Smc_rd_byte();                          /* Used/Unused block          */
          }
          while ( ( (byte_6 != 0xFF) && (byte_6 != 0xE8) ) || (byte_5 != 0xFF) );

          free_bloc_pos = temp_address >> 5;
          gl_buffer[i] = (free_bloc_pos >> 8) + 0x80;
          gl_buffer[i + 1] = free_bloc_pos;
        }
      }

      Smc_write_open_B_area(gl_address, 0x00);        /* Write second part of LUT */
      smc_download_buffer();

      /* Write redundant data */
      Smc_wr_byte(0xFF); Smc_wr_byte(0xFF); Smc_wr_byte(0xFF);
      Smc_wr_byte(0xFF); Smc_wr_byte(0xFF);
      Smc_wr_byte(0xFF);
      Smc_wr_byte(0xE8); Smc_wr_byte(0xFF);                     /* Logical block value */
      Smc_wr_byte(0xFF); Smc_wr_byte(0xFF); Smc_wr_byte(0xFF);  /* ECC area 2 */
      Smc_wr_byte(0xE8); Smc_wr_byte(0xFF);                     /* Logical block value */
      Smc_wr_byte(0xFF); Smc_wr_byte(0xFF); Smc_wr_byte(0xFF);  /* ECC area 1 */
       
      Smc_send_command(SMC_PAGE_PROGRAM_CMD);
      start += 0x80;
      end   += 0x80;
      gl_address++;        /* Increase the address of the conversion table */
    }
    while (start < SMC_BLOCK_PER_ZONE);
  }
  Smc_wait_busy();
}


/*F**************************************************************************
* NAME: smc_init
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   SMC initialisation
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit smc_init (void)
{
  P2 = SMC_IDLE_STATE_ADD;
  if ( Smc_card_detect() == KO )
  {
    gl_mem_failure = TRUE;
    Smc_CS_OFF();
    return KO;
  }

  Smc_CS_ON();

  Smc_send_command(SMC_RESET_CMD);
  Smc_wait_busy();
  do
  {
    Smc_send_command(SMC_READ_ID_CMD);   /* Read ID code */
    Smc_send_address(0x00);
    Smc_wait_busy();
  } while (Smc_rd_byte() == 0x00);

  switch (Smc_rd_byte())                  /* Device code */
  {
    case 0x73 :                           /* 16 Mbyte  */
      smc_device_type = SMC_SIZE_16MB;
      smc_zone_max = 1;
      smc_disk_size =  SMC_SECTOR_SIZE_16MB;
      smc_64 = 0;
      break;
    case 0x75 :                           /* 32 Mbyte  */
      smc_device_type = SMC_SIZE_32MB;
      smc_zone_max = 2;
      smc_disk_size =  SMC_SECTOR_SIZE_32MB;
      smc_64 = 0;
      break;
    case 0x76 :                           /* 64 Mbyte  */
      smc_device_type = SMC_SIZE_64MB;
      smc_zone_max = 4;
      smc_disk_size =  SMC_SECTOR_SIZE_64MB;
      smc_64 = 1;                         /* 4 address cycles */
      break;
    case 0x79 :                           /* 128 Mbyte */
      smc_device_type = SMC_SIZE_128MB;
      smc_zone_max = 8;
      smc_disk_size =  SMC_SECTOR_SIZE_128MB;
      smc_64 = 1;                         /* 4 address cycles */
      break;
  }

  read_spare_byte();
  return OK;
}

/*F**************************************************************************
* NAME: smc_read_open
*----------------------------------------------------------------------------
* PARAMS:
*   pos: address of the logic sector to read (size 512 bytes)
*
* return:
*   Update memory for reading
*----------------------------------------------------------------------------
* PURPOSE:
*   Low level memory read update
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE: 
*----------------------------------------------------------------------------
* REQUIREMENTS: 
*****************************************************************************/
bit smc_read_open (Uint32 pos)
{
Uint16 physical_block;

  Smc_CS_ON();

  if ( Smc_card_detect() == KO )
  {
    gl_mem_failure = TRUE;
    return 0xFF;
  }

  if (smc_lut_modified)
  {
    smc_reassign_block();
    smc_lut_modified = FALSE;
  }

  gl_ptr_mem = pos;
  gl_cpt_page = 0;

  /* Determine the logical block value */
  smc_logical_block = (gl_ptr_mem >> 5);

  /* Determinate zone */
  smc_zone = smc_logical_block / 1000;

  /* Each zone have 1000 data blocks */
  smc_logical_block = smc_logical_block - (1000 * (Uint16)(smc_zone));

  /* Calculate the address where are the physical block value */
  gl_address  = ((Uint32)(smc_lut_block[smc_zone])<<5) + ((Uint32)(smc_logical_block) >> 8);
  gl_address += ((Uint32)(smc_lut_index[smc_zone])<<2);
  /* Open the look-up table */
  Smc_wait_busy();
  if (smc_logical_block & 0x80)
  {
    Smc_send_command(SMC_READ_B_AREA_CMD);            /* 2nd half page */
    Smc_send_address( (smc_logical_block << 1) - 256);
  }
  else
  {
    Smc_send_command(SMC_READ_A_AREA_CMD);            /* first half page */
    Smc_send_address(smc_logical_block << 1);
  }

  Smc_send_address ( ((Byte*)&gl_address)[3] );   /* 2nd address cycle         */
  Smc_send_address ( ((Byte*)&gl_address)[2] );   /* 3rd address cycle         */
  if (smc_64)                                        /* Size of card >= 64Mbytes ?*/
    Smc_send_address ( ((Byte*)&gl_address)[1] ); /* 4th address cycle         */
  
  Smc_wait_busy();

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

  /* Calculate the physical sector address */
  smc_current_physical_sector_addr = ((Uint32)(physical_block) << 5) + (gl_ptr_mem & 0x1F); 
  Smc_CS_OFF();
  return OK;
}


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


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

  if ( Smc_card_detect() == KO )
  {
    gl_mem_failure = TRUE;
    Smc_CS_OFF();
    return KO;
  }
  
  Smc_wait_busy();
  if (!gl_cpt_page)
  {
    Smc_CS_ON();
    Smc_read_open_A_area(smc_current_physical_sector_addr, 0x00);
    b = Smc_rd_byte();
    Smc_CS_OFF();
  }
  else
  {
    b = Smc_rd_byte();
  }

  
  gl_cpt_page++;
  
  /* Detection of the end of data page */
  if (gl_cpt_page == SMC_DATA_SIZE)                 
  {
    /* read spare data bytes */
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();
    Smc_rd_byte();

    gl_ptr_mem++;                           /* new page          */

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

    if ( !(gl_ptr_mem & 0x1F) )   /* New block ? */
    {
      smc_read_open(gl_ptr_mem);
    }
    else
    {
      smc_current_physical_sector_addr++;
    }
  }
  return b;
}


/*F**************************************************************************
* NAME: smc_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 SMC
*   card to USB controller 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit smc_read_sector(Uint16 nb_sector)
{
Byte i;
bit   begin_ping_pong;

  begin_ping_pong = TRUE;

  do
  {
    if ( Smc_card_detect() == KO )
    {
      gl_mem_failure = TRUE;
      Smc_CS_OFF();
      return KO;
    }
    Smc_CS_ON();
    Smc_wait_busy();
    Smc_read_open_A_area(smc_current_physical_sector_addr, 0x00);
    for (i = 8; i != 0; i--)
    {
      Usb_write_byte(Smc_rd_byte());            /* read 64 bytes from card */
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());
      Usb_write_byte(Smc_rd_byte());