df.c

ATMEL 90usb128 USB source,include USB protocol stack.

  // Final step to clear the SPIF bit will be done on the next write

  // Send the three address Bytes made of:
  //  (.) the page-address(first xbits),
  //  (.) the Byte-address within the page(last ybits).
  // (x and y depending on the DF type).
  // NOTE: the bits of gl_ptr_mem above the 24bits are not useful for the local
  // DF addressing. They are used for DF discrimination when there are several
  // DFs.
  Spi_write_data((MSB1(gl_ptr_mem) << DF_SHFT_B1) | (MSB2(gl_ptr_mem) >> DF_SHFT_B2));
  Spi_write_data(((MSB2(gl_ptr_mem) & ~DF_PAGE_MASK) << DF_SHFT_B1) | (MSB2(gl_ptr_mem) & DF_PAGE_MASK));
  Spi_write_data(MSB3(gl_ptr_mem));
  Spi_ack_write();         // Final step to clear the SPIF bit.

  return OK;
}


//!
//! @brief This function fills the end of the logical sector (512B) and launch
//! page programming.
//!
//! @warning Code:?? bytes (function code length)
//!
//! @param  None
//!
//! @return None
//!/
void df_write_close (void)
{
  //#
  //# While end of logical sector (512B) not reached, zero-fill the remaining
  //# memory Bytes.
  //#
  while ((MSB3(gl_ptr_mem) != 0x00) || ((MSB2(gl_ptr_mem) & 0x01) != 0x00))
  {
    Spi_write_data(0x00);  // (.) Final step to clear the SPIF bit,
                           // (.) Write 0x00
                           // (.) first step to clear the SPIF bit.
    gl_ptr_mem++;
  }
  Spi_ack_write();            // Final step to clear the SPIF bit.

  Df_desel_all();             // Launch page programming (or simply unselect memory
                              // if the while loop was not performed).
  df_set_busy(df_select);     // Current memory is busy
}



//!
//! @brief This function is optimized and writes nb-sector * 512 Bytes from
//! USB controller to DataFlash memory
//!
//!         DATA FLOW is: USB => DF
//!
//!
//! NOTE:
//!   - First call must be preceded by a call to the df_write_open() function,
//!   - As 512 is always a sub-multiple of page size, there is no need to check
//!     page end for each Bytes,
//!   - The USB EPOUT must have been previously selected,
//!   - Interrupts are disabled during transfer to avoid timer interrupt,
//!   - nb_sector always >= 1, cannot be zero.
//!
//! @warning code:?? bytes (function code length)
//!
//! @param nb_sector    number of contiguous sectors to write [IN]
//!
//! @return bit
//!   The write succeeded  -> OK
//!/
bit df_write_sector (Uint16 nb_sector)
{
  Byte i;

   do
   {
    //# Write 8x64b = 512b from the USB FIFO OUT.
    for (i = 8; i != 0; i--)
    {
      // Wait end of rx in USB EPOUT.
      while(Is_usb_read_enabled()==FALSE);

      Disable_interrupt();    // Global disable.

      // SPI write principle: send a Byte then clear the SPIF flag.
      // Spi_write_data(Usb_read_byte()): (.) Final step to clear the SPIF bit,
      //                                  (.) send a Byte read from USB,
      //                                  (.) 1st step to clear the SPIF bit.
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_ack_write();        // Final step to clear the SPIF bit.

      Usb_ack_receive_out();  // USB EPOUT read acknowledgement.

      Enable_interrupt();     // Global re-enable.
    } // for (i = 8; i != 0; i--)

      gl_ptr_mem += 512;        // Update the memory pointer.
      nb_sector--;              // 1 more sector written

      //# Launch page programming if end of page.
      //#
      #if DF_PAGE_SIZE > 512
         // Check if end of 1024b page.
         if ((MSB2(gl_ptr_mem) & DF_PAGE_MASK) == 0x00)
         {
            Df_desel_all();         // Launch page programming
            df_set_busy(df_select);     // memory is busy
            #if (DF_NB_MEM == 1)
               if (nb_sector != 0)
                 df_write_open(gl_ptr_mem>>9);
            #endif
         }
      #else
         // Always end of page.
         Df_desel_all();           // Launch page programming
         df_set_busy(df_select);     // memory is busy
         #if (DF_NB_MEM == 1)
            if (nb_sector != 0)
              df_write_open(gl_ptr_mem>>9);
         #endif
      #endif
   }
   while (nb_sector != 0);

  return OK;                  // Write done
}


//!
//! @brief This function is optimized and writes nb-sector * 512 Bytes from
//! USB HOST controller to DataFlash memory
//!
//!         DATA FLOW is: USB => DF
//!
//!
//! NOTE:
//!   - This function should be used only when using the USB controller in HOST mode
//!   - First call must be preceded by a call to the df_write_open() function,
//!   - As 512 is always a sub-multiple of page size, there is no need to check
//!     page end for each Bytes,
//!   - The USB PIPE OUT must have been previously selected,
//!   - Interrupts are disabled during transfer to avoid timer interrupt,
//!   - nb_sector always >= 1, cannot be zero.
//!
//! @warning code:?? bytes (function code length)
//!
//! @param nb_sector    number of contiguous sectors to write [IN]
//!
//! @return bit
//!   The write succeeded  -> OK
//!/
bit df_host_write_sector (Uint16 nb_sector)
{
  Byte i;

   do
   {
    //# Write 8x64b = 512b from the USB FIFO OUT.
    for (i = 8; i != 0; i--)
    {
      // Wait end of rx in USB PIPE IN.
      Host_unfreeze_pipe();
      while(Is_host_read_enabled()==FALSE);

      Disable_interrupt();    // Global disable.

      // SPI write principle: send a Byte then clear the SPIF flag.
      // Spi_write_data(Usb_read_byte()): (.) Final step to clear the SPIF bit,
      //                                  (.) send a Byte read from USB,
      //                                  (.) 1st step to clear the SPIF bit.
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_write_data(Usb_read_byte());
      Spi_ack_write();        // Final step to clear the SPIF bit.
      Host_ack_in_received();  // USB PIPE IN read acknowledgement.

      Enable_interrupt();     // Global re-enable.
    } // for (i = 8; i != 0; i--)

      gl_ptr_mem += 512;        // Update the memory pointer.
      nb_sector--;              // 1 more sector written

      //# Launch page programming if end of page.
      //#
      #if DF_PAGE_SIZE > 512
         // Check if end of 1024b page.
         if ((MSB2(gl_ptr_mem) & DF_PAGE_MASK) == 0x00)
         {
            Df_desel_all();         // Launch page programming
            df_set_busy(df_select);     // memory is busy
            #if (DF_NB_MEM == 1)
               if (nb_sector != 0)
                 df_write_open(gl_ptr_mem>>9);
            #endif
         }
      #else
         // Always end of page.
         Df_desel_all();           // Launch page programming
         df_set_busy(df_select);     // memory is busy
         #if (DF_NB_MEM == 1)
            if (nb_sector != 0)
              df_write_open(gl_ptr_mem>>9);
         #endif
      #endif
   }
   while (nb_sector != 0);