smc.c

ATMEL全套MP3设计资料

}


/*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_send_command (SMC_READ_A_AREA_CMD);
    Smc_send_address ( 0x00 );                                       /* 1st address cycle         */
    Smc_send_address ( ((Byte*)&current_physical_sector_addr)[3] );  /* 2nd address cycle         */
    Smc_send_address ( ((Byte*)&current_physical_sector_addr)[2] );  /* 3rd address cycle         */
    if (smc_64)                                                      /* Size of card >= 64Mbytes ?*/
      Smc_send_address ( ((Byte*)&current_physical_sector_addr)[1] );/* 4th address cycle         */
  
    Smc_wait_busy();
    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
    {
      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(void)
{
Byte i;
  if ( Smc_card_detect() == KO )
  {
    gl_mem_failure = TRUE;
    Smc_CS_OFF();
    return KO;
  }
  Smc_CS_ON();
  Smc_wait_busy();
  Smc_send_command (SMC_READ_A_AREA_CMD);
  Smc_send_address ( 0x00 );                                       /* 1st address cycle         */
  Smc_send_address ( ((Byte*)&current_physical_sector_addr)[3] );  /* 2nd address cycle         */
  Smc_send_address ( ((Byte*)&current_physical_sector_addr)[2] );  /* 3rd address cycle         */
  if (smc_64)                                                      /* Size of card >= 64Mbytes ?*/
    Smc_send_address ( ((Byte*)&current_physical_sector_addr)[1] );/* 4th address cycle         */
  Smc_wait_busy();


  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());
    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());
    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_set_TXRDY();                        /* start usb transfer */
    while (!Usb_tx_complete());             /* wait end of transfer */
    Usb_clear_TXCMPL();                     /* ack transfer */
  }

  gl_ptr_mem++;                             /* new page          */
  Smc_CS_OFF();  
  if ( !(gl_ptr_mem & 0x1F) )               /* New block ? */
  {
    smc_read_open(gl_ptr_mem);
  }
  else
  {
    current_physical_sector_addr++;
  }
  return OK;
}


/*F**************************************************************************
* NAME: smc_write_open
*----------------------------------------------------------------------------
* AUTHOR:
*----------------------------------------------------------------------------
* PARAMS:
*   pos: address of the the next write data
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
*   Low level memory write update
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit smc_write_open (Uint32 pos)
{
Byte i;
Byte j;
bit change_zone = FALSE;

  if ( Smc_card_detect() == KO )
  {
    gl_mem_failure = TRUE;
    Smc_CS_OFF();
    return KO;
  }
  gl_ptr_mem = pos;
  gl_cpt_page = 0;

  /* Determine the logical block value */
  logical_block = (gl_ptr_mem >> 5);
  smc_zone = 0;

  while (logical_block > 999)
  {
    logical_block -= 1000;
    smc_zone++;
  }
  Smc_CS_ON();

  if (smc_zone != smc_old_zone)
  {
    change_zone = TRUE;
    if (lut_modified)
    { /* save old lut */
      i = smc_old_zone;
      smc_old_zone = smc_zone;
      smc_zone = i;
      smc_reassign_block();
      lut_modified = FALSE;
      smc_zone = smc_old_zone;
    }
    else
    { /* update old zone value */
      smc_old_zone = smc_zone;
    }
    block_min = 0xFFFF;
    gl_buf_free_idx = 0;
  }

  if ( (logical_block >= block_min) && (logical_block < (block_min + SMC_BUFFER_SIZE - 5)))
  { /* we don't have to update the buffer */
    smc_calc_logical_block();
    gl_buf_idx = logical_block - block_min;
  }
  else 
  { /* we have to update the buffer */
    /* Store the look up table block address */
    look_up_table_block =  lut_block[smc_zone];
    /* If LUT have been modified */
    if (lut_modified)           
    {
      smc_reassign_block();      /* update the LUT */
    }
    /* Calculate the address for LUT access */
    address = ((Uint32)(look_up_table_block)<<5) + ((Uint32)(logical_block) >> 8);
    address += (Uint32)(lut_index[smc_zone])<<2;
    /* Calculate the redundant block address value */
    smc_calc_logical_block();
    i = logical_block & 0xFF;
    /* For the current zone, initialize the number of spare block */
    spare_block = smc_spare_block_number[smc_zone];
    /* Calculate the low and the high block stored in the buffer */
    block_min = logical_block;
    block_max = ( (logical_block + SMC_BUFFER_SIZE) > 999) ? (1000 - logical_block) : SMC_BUFFER_SIZE;

    /* Open the look-up table */
    Smc_wait_busy();     
    if (logical_block & 0x80)
    {
      Smc_send_command(SMC_READ_B_AREA_CMD);            /* 2nd half page */
      Smc_send_address( (logical_block << 1) - 256);