df.c

MP3播放器详细设计方案

      else
        DF_CS3 = 0;
    }
    /* select new page */
    Spi_write_data(DF_RD_MAIN);             /* read main */
    Spi_ack_write();
    Spi_write_data((((Byte*)&gl_ptr_mem)[1] << DF_SHFT_B1) | (((Byte*)&gl_ptr_mem)[2] >> DF_SHFT_B2));
    Spi_ack_write();
    Spi_write_data((((Byte*)&gl_ptr_mem)[2] & ~DF_PAGE_MASK) << DF_SHFT_B1);
    Spi_ack_write();
    Spi_write_data(0x00);                   /* address 00 of the page */
    Spi_ack_write();
    Spi_write_data(0xFF);                   /* 4 dummy writes for reading delay */
    Spi_ack_write();
    Spi_write_data(0xFF);
    Spi_ack_write();
    Spi_write_data(0xFF);
    Spi_ack_write();
    Spi_write_data(0xFF);
    Spi_ack_write();
    Spi_ack_write();                        /* clear SPI flag */
  }
  gl_ptr_mem++;
  Spi_write_data(0xFF);                     /* dummy write to read data */
  Spi_ack_read();
  return Spi_read_data();                   /* read current data */
}


/*F**************************************************************************
* NAME: df_read_sector
*----------------------------------------------------------------------------
* PARAMS:
*   nb_sector:  number of contiguous sector to read 
*   global:     gl_ptr_mem
*
* return:
*   OK read done
*----------------------------------------------------------------------------
* PURPOSE: 
*   This function is an optimized function that writes nb-sector * 512 bytes
*   from DataFlash memory to USB controller 
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*   - First call must be preceded by a call to df_read_open function
*   - As 512 is always a sub-multiple of page size, there is no need to check
*     page end for each bytes
*   - Interrupts are disabled during transfer to avoid timer interrupt
*   - nb_sector always >= 1, can not be zero
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit df_read_sector (Uint16 nb_sector)
{
Byte i;
bit   begin_ping_pong;

  begin_ping_pong = TRUE;

  do
  {
    /* check if end of page */
    if ((((Byte*)&gl_ptr_mem)[3] == 0x00) && ((((Byte*)&gl_ptr_mem)[2] & DF_PAGE_MASK) == 0x00))
    {
      DF_CS |= DF_DESEL_ALL;                /* deselect all memories */
  
      /* select right memory */
      if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEH] & DF_MEM_MASKH) == 0)
      {
        if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEL] & DF_MEM_MASKL) == 0)
          DF_CS0 = 0;
        else
          DF_CS1 = 0;
      }
      else
      {
        if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEL] & DF_MEM_MASKL) == 0)
          DF_CS2 = 0;
        else
          DF_CS3 = 0;
      }
      /* select new page */
      Spi_write_data(DF_RD_MAIN);           /* read main */
      Spi_ack_write();
      Spi_write_data((((Byte*)&gl_ptr_mem)[1] << DF_SHFT_B1) | (((Byte*)&gl_ptr_mem)[2] >> DF_SHFT_B2));
      Spi_ack_write();
      Spi_write_data((((Byte*)&gl_ptr_mem)[2] & ~DF_PAGE_MASK) << DF_SHFT_B1);
      Spi_ack_write();
      Spi_write_data(0x00);                 /* address 00 of the page */
      Spi_ack_write();
      Spi_write_data(0xFF);                 /* 4 dummy writes for reading delay */
      Spi_ack_write();
      Spi_write_data(0xFF);
      Spi_ack_write();
      Spi_write_data(0xFF);
      Spi_ack_write();
      Spi_write_data(0xFF);
      Spi_ack_write();
      Spi_ack_write();                      /* clear SPI flag */
    }
    for (i = 8; i != 0; i--)                /* read 8x64b = 512b */
    {
      Disable_interrupt();                  /* global disable */
      Spi_write_data(0xFF); Spi_ack_read();
       /* read 1st data  while receiving the 2nd DO NOT MODIFY */
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Spi_write_dummy(); ACC = SPSTA; Usb_write_byte(Spi_read_data());
                         ACC = SPSTA; Usb_write_byte(Spi_read_data());
      Enable_interrupt();                   /* global re-enable */

      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 */
    }
    
    gl_ptr_mem += 512;
    nb_sector--;                            /* 1 more sector read */
  }
  while (nb_sector != 0);

  while (!Usb_tx_complete());             /* wait end of last transfer */
  Usb_clear_TXCMPL();                     /* ack transfer */
  
  return OK;                                /* read done */
}


/*F**************************************************************************
* NAME: df_write_open
*----------------------------------------------------------------------------
* PARAMS:
*   pos: next write operation address
*
* return:
*   status: TRUE: open done
*           FALSE: open not done: memory is still busy
*----------------------------------------------------------------------------
* PURPOSE: 
*   Open memory in write mode
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*   If page buffer > 512 bytes, page content is first loaded in buffer to be
*   partially updated by write_byte or write64 functions
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/
bit df_write_open (Uint32 pos)
{
  gl_ptr_mem = pos << 9;                    /* gl_ptr_mem = pos * 512 */
  if (df_mem_busy)
  {
    df_mem_busy = FALSE;
    df_busy();                              /* wait end of programming */
  }

#if DF_PAGE_SIZE > 512
  /* select right memory */
  if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEH] & DF_MEM_MASKH) == 0)
  {
    if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEL] & DF_MEM_MASKL) == 0)
      DF_CS0 = 0;
    else
      DF_CS1 = 0;
  }
  else
  {
    if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEL] & DF_MEM_MASKL) == 0)
      DF_CS2 = 0;
    else
      DF_CS3 = 0;
  }
  /* get page content in buffer */
  Spi_write_data(DF_TF_BUF_1);              /* main to buffer 1 transfer */
  Spi_ack_write();
  Spi_write_data((((Byte*)&gl_ptr_mem)[1] << DF_SHFT_B1) | (((Byte*)&gl_ptr_mem)[2] >> DF_SHFT_B2));
  Spi_ack_write();
  Spi_write_data(((Byte*)&gl_ptr_mem)[2] << DF_SHFT_B1);
  Spi_ack_write();
  Spi_write_data(0xFF);                     /* dummy byte */
  Spi_ack_write();
  DF_CS |= DF_DESEL_ALL;                    /* deselect memory */

  df_busy();                                /* wait end of page transfer */
#endif

  /* select right memory */
  if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEH] & DF_MEM_MASKH) == 0)
  {
    if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEL] & DF_MEM_MASKL) == 0)
      DF_CS0 = 0;
    else
      DF_CS1 = 0;
  }
  else
  {
    if ((((Byte*)&gl_ptr_mem)[DF_MEM_BYTEL] & DF_MEM_MASKL) == 0)
      DF_CS2 = 0;
    else
      DF_CS3 = 0;
  }
  /* prepare the memory in write mode */
  Spi_write_data(DF_PG_BUF_1);              /* main program through buffer 1 */
  Spi_ack_write();
  Spi_write_data((((Byte*)&gl_ptr_mem)[1] << DF_SHFT_B1) | (((Byte*)&gl_ptr_mem)[2] >> DF_SHFT_B2));
  Spi_ack_write();
  Spi_write_data(((((Byte*)&gl_ptr_mem)[2] & ~DF_PAGE_MASK) << DF_SHFT_B1) | (((Byte*)&gl_ptr_mem)[2] & DF_PAGE_MASK));
  Spi_ack_write();
  Spi_write_data(((Byte*)&gl_ptr_mem)[3]);
  Spi_ack_write();
  return OK;
}


/*F**************************************************************************
* NAME: df_write_close
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE: 
*   This function fills the end of the logical sector (512b) and launch page
*   programming
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS:
*****************************************************************************/