Add new tag for the LUFA-120219-BETA release.

[pub/USBasp.git] / Demos / Device / ClassDriver / MassStorageKeyboard / Lib / DataflashManager.c

diff --git a/Demos/Device/ClassDriver/MassStorageKeyboard/Lib/DataflashManager.c b/Demos/Device/ClassDriver/MassStorageKeyboard/Lib/DataflashManager.c
index 445082f..146ad69 100644 (file)
--- a/Demos/Device/ClassDriver/MassStorageKeyboard/Lib/DataflashManager.c
+++ b/Demos/Device/ClassDriver/MassStorageKeyboard/Lib/DataflashManager.c
@@ -1,21 +1,21 @@
 /*
              LUFA Library
 /*
              LUFA Library

-     Copyright (C) Dean Camera, 2010.
-              
+     Copyright (C) Dean Camera, 2012.
+

   dean [at] fourwalledcubicle [dot] com
   dean [at] fourwalledcubicle [dot] com

-      www.fourwalledcubicle.com
+           www.lufa-lib.org

 */
 
 /*
 */
 
 /*

-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2012  Dean Camera (dean [at] fourwalledcubicle [dot] com)

 
 

-  Permission to use, copy, modify, distribute, and sell this 
+  Permission to use, copy, modify, distribute, and sell this

   software and its documentation for any purpose is hereby granted
   software and its documentation for any purpose is hereby granted

-  without fee, provided that the above copyright notice appear in 
+  without fee, provided that the above copyright notice appear in

   all copies and that both that the copyright notice and this
   all copies and that both that the copyright notice and this

-  permission notice and warranty disclaimer appear in supporting 
-  documentation, and that the name of the author not be used in 
-  advertising or publicity pertaining to distribution of the 
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the

   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this
   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this


@@ -77,7 +77,7 @@ void DataflashManager_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceIn
        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;
        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;

-               
+

                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {
                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {


@@ -86,7 +86,7 @@ void DataflashManager_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceIn
                        {
                                /* Clear the current endpoint bank */
                                Endpoint_ClearOUT();
                        {
                                /* Clear the current endpoint bank */
                                Endpoint_ClearOUT();

-                               
+

                                /* Wait until the host has sent another packet */
                                if (Endpoint_WaitUntilReady())
                                  return;
                                /* Wait until the host has sent another packet */
                                if (Endpoint_WaitUntilReady())
                                  return;


@@ -125,27 +125,27 @@ void DataflashManager_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceIn
 
                                /* Send the Dataflash buffer write command */
                                Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2WRITE : DF_CMD_BUFF1WRITE);
 
                                /* Send the Dataflash buffer write command */
                                Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2WRITE : DF_CMD_BUFF1WRITE);

-                               Dataflash_SendAddressBytes(0, 0);                               
+                               Dataflash_SendAddressBytes(0, 0);

                        }
 
                        /* Write one 16-byte chunk of data to the Dataflash */
                        }
 
                        /* Write one 16-byte chunk of data to the Dataflash */

-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       Dataflash_SendByte(Endpoint_Read_Byte());
-                       
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+                       Dataflash_SendByte(Endpoint_Read_8());
+

                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;
 
                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;
 


@@ -154,10 +154,10 @@ void DataflashManager_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceIn
 
                        /* Check if the current command is being aborted by the host */
                        if (MSInterfaceInfo->State.IsMassStoreReset)
 
                        /* Check if the current command is being aborted by the host */
                        if (MSInterfaceInfo->State.IsMassStoreReset)

-                         return;                       
+                         return;

                }
                }

-                       
-               /* Decrement the blocks remaining counter and reset the sub block counter */
+
+               /* Decrement the blocks remaining counter */

                TotalBlocks--;
        }
 
                TotalBlocks--;
        }
 


@@ -201,15 +201,15 @@ void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
        Dataflash_SendByte(0x00);
        Dataflash_SendByte(0x00);
        Dataflash_SendByte(0x00);
        Dataflash_SendByte(0x00);
        Dataflash_SendByte(0x00);
        Dataflash_SendByte(0x00);

-       
+

        /* Wait until endpoint is ready before continuing */
        if (Endpoint_WaitUntilReady())
          return;
        /* Wait until endpoint is ready before continuing */
        if (Endpoint_WaitUntilReady())
          return;

-       
+

        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;
        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;

-               
+

                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {
                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {


@@ -218,12 +218,12 @@ void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
                        {
                                /* Clear the endpoint bank to send its contents to the host */
                                Endpoint_ClearIN();
                        {
                                /* Clear the endpoint bank to send its contents to the host */
                                Endpoint_ClearIN();

-                               
+

                                /* Wait until the endpoint is ready for more data */
                                if (Endpoint_WaitUntilReady())
                                  return;
                        }
                                /* Wait until the endpoint is ready for more data */
                                if (Endpoint_WaitUntilReady())
                                  return;
                        }

-                       
+

                        /* Check if end of Dataflash page reached */
                        if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))
                        {
                        /* Check if end of Dataflash page reached */
                        if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))
                        {


@@ -233,7 +233,7 @@ void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 
                                /* Select the next Dataflash chip based on the new Dataflash page index */
                                Dataflash_SelectChipFromPage(CurrDFPage);
 
                                /* Select the next Dataflash chip based on the new Dataflash page index */
                                Dataflash_SelectChipFromPage(CurrDFPage);

-                               
+

                                /* Send the Dataflash main memory page read command */
                                Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
                                Dataflash_SendAddressBytes(CurrDFPage, 0);
                                /* Send the Dataflash main memory page read command */
                                Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
                                Dataflash_SendAddressBytes(CurrDFPage, 0);


@@ -241,29 +241,29 @@ void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);

-                       }       
+                       }

 
                        /* Read one 16-byte chunk of data from the Dataflash */
 
                        /* Read one 16-byte chunk of data from the Dataflash */

-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       Endpoint_Write_Byte(Dataflash_ReceiveByte());
-                       
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+                       Endpoint_Write_8(Dataflash_ReceiveByte());
+

                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;
                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;

-                       
+

                        /* Increment the block 16 byte block counter */
                        BytesInBlockDiv16++;
 
                        /* Increment the block 16 byte block counter */
                        BytesInBlockDiv16++;
 


@@ -271,11 +271,11 @@ void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
                        if (MSInterfaceInfo->State.IsMassStoreReset)
                          return;
                }
                        if (MSInterfaceInfo->State.IsMassStoreReset)
                          return;
                }

-               
+

                /* Decrement the blocks remaining counter */
                TotalBlocks--;
        }
                /* Decrement the blocks remaining counter */
                TotalBlocks--;
        }

-       
+

        /* If the endpoint is full, send its contents to the host */
        if (!(Endpoint_IsReadWriteAllowed()))
          Endpoint_ClearIN();
        /* If the endpoint is full, send its contents to the host */
        if (!(Endpoint_IsReadWriteAllowed()))
          Endpoint_ClearIN();


@@ -285,7 +285,7 @@ void DataflashManager_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInf
 }
 
 /** Writes blocks (OS blocks, not Dataflash pages) to the storage medium, the board Dataflash IC(s), from
 }
 
 /** Writes blocks (OS blocks, not Dataflash pages) to the storage medium, the board Dataflash IC(s), from

- *  the a given RAM buffer. This routine reads in OS sized blocks from the buffer and writes them to the
+ *  the given RAM buffer. This routine reads in OS sized blocks from the buffer and writes them to the

  *  Dataflash in Dataflash page sized blocks. This can be linked to FAT libraries to write files to the
  *  Dataflash.
  *
  *  Dataflash in Dataflash page sized blocks. This can be linked to FAT libraries to write files to the
  *  Dataflash.
  *


@@ -315,11 +315,11 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress,
        /* Send the Dataflash buffer write command */
        Dataflash_SendByte(DF_CMD_BUFF1WRITE);
        Dataflash_SendAddressBytes(0, CurrDFPageByte);
        /* Send the Dataflash buffer write command */
        Dataflash_SendByte(DF_CMD_BUFF1WRITE);
        Dataflash_SendAddressBytes(0, CurrDFPageByte);

-       
+

        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;
        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;

-               
+

                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {
                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {


@@ -356,22 +356,22 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress,
 
                                /* Send the Dataflash buffer write command */
                                Dataflash_ToggleSelectedChipCS();
 
                                /* Send the Dataflash buffer write command */
                                Dataflash_ToggleSelectedChipCS();

-                               Dataflash_SendByte(DF_CMD_BUFF1WRITE);
+                               Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2WRITE : DF_CMD_BUFF1WRITE);

                                Dataflash_SendAddressBytes(0, 0);
                        }
                                Dataflash_SendAddressBytes(0, 0);
                        }

-                       
+

                        /* Write one 16-byte chunk of data to the Dataflash */
                        for (uint8_t ByteNum = 0; ByteNum < 16; ByteNum++)
                          Dataflash_SendByte(*(BufferPtr++));
                        /* Write one 16-byte chunk of data to the Dataflash */
                        for (uint8_t ByteNum = 0; ByteNum < 16; ByteNum++)
                          Dataflash_SendByte(*(BufferPtr++));

-                       
+

                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;
 
                        /* Increment the block 16 byte block counter */
                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;
 
                        /* Increment the block 16 byte block counter */

-                       BytesInBlockDiv16++;            
+                       BytesInBlockDiv16++;

                }
                }

-                       
-               /* Decrement the blocks remaining counter and reset the sub block counter */
+
+               /* Decrement the blocks remaining counter */

                TotalBlocks--;
        }
 
                TotalBlocks--;
        }
 


@@ -386,7 +386,7 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress,
 }
 
 /** Reads blocks (OS blocks, not Dataflash pages) from the storage medium, the board Dataflash IC(s), into
 }
 
 /** Reads blocks (OS blocks, not Dataflash pages) from the storage medium, the board Dataflash IC(s), into

- *  the a preallocated RAM buffer. This routine reads in Dataflash page sized blocks from the Dataflash
+ *  the preallocated RAM buffer. This routine reads in Dataflash page sized blocks from the Dataflash

  *  and writes them in OS sized blocks to the given buffer. This can be linked to FAT libraries to read
  *  the files stored on the Dataflash.
  *
  *  and writes them in OS sized blocks to the given buffer. This can be linked to FAT libraries to read
  *  the files stored on the Dataflash.
  *


@@ -416,7 +416,7 @@ void DataflashManager_ReadBlocks_RAM(const uint32_t BlockAddress,
        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;
        while (TotalBlocks)
        {
                uint8_t BytesInBlockDiv16 = 0;

-               
+

                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {
                /* Write an endpoint packet sized data block to the Dataflash */
                while (BytesInBlockDiv16 < (VIRTUAL_MEMORY_BLOCK_SIZE >> 4))
                {


@@ -429,7 +429,7 @@ void DataflashManager_ReadBlocks_RAM(const uint32_t BlockAddress,
 
                                /* Select the next Dataflash chip based on the new Dataflash page index */
                                Dataflash_SelectChipFromPage(CurrDFPage);
 
                                /* Select the next Dataflash chip based on the new Dataflash page index */
                                Dataflash_SelectChipFromPage(CurrDFPage);

-                               
+

                                /* Send the Dataflash main memory page read command */
                                Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
                                Dataflash_SendAddressBytes(CurrDFPage, 0);
                                /* Send the Dataflash main memory page read command */
                                Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);
                                Dataflash_SendAddressBytes(CurrDFPage, 0);


@@ -437,19 +437,19 @@ void DataflashManager_ReadBlocks_RAM(const uint32_t BlockAddress,
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);
                                Dataflash_SendByte(0x00);

-                       }       
+                       }

 
                        /* Read one 16-byte chunk of data from the Dataflash */
                        for (uint8_t ByteNum = 0; ByteNum < 16; ByteNum++)
                          *(BufferPtr++) = Dataflash_ReceiveByte();
 
                        /* Read one 16-byte chunk of data from the Dataflash */
                        for (uint8_t ByteNum = 0; ByteNum < 16; ByteNum++)
                          *(BufferPtr++) = Dataflash_ReceiveByte();

-                       
+

                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;
                        /* Increment the Dataflash page 16 byte block counter */
                        CurrDFPageByteDiv16++;

-                       
+

                        /* Increment the block 16 byte block counter */
                        BytesInBlockDiv16++;
                }
                        /* Increment the block 16 byte block counter */
                        BytesInBlockDiv16++;
                }

-               
+

                /* Decrement the blocks remaining counter */
                TotalBlocks--;
        }
                /* Decrement the blocks remaining counter */
                TotalBlocks--;
        }


@@ -464,7 +464,7 @@ void DataflashManager_ResetDataflashProtections(void)
        /* Select first Dataflash chip, send the read status register command */
        Dataflash_SelectChip(DATAFLASH_CHIP1);
        Dataflash_SendByte(DF_CMD_GETSTATUS);
        /* Select first Dataflash chip, send the read status register command */
        Dataflash_SelectChip(DATAFLASH_CHIP1);
        Dataflash_SendByte(DF_CMD_GETSTATUS);

-       
+

        /* Check if sector protection is enabled */
        if (Dataflash_ReceiveByte() & DF_STATUS_SECTORPROTECTION_ON)
        {
        /* Check if sector protection is enabled */
        if (Dataflash_ReceiveByte() & DF_STATUS_SECTORPROTECTION_ON)
        {


@@ -476,12 +476,12 @@ void DataflashManager_ResetDataflashProtections(void)
                Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[2]);
                Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[3]);
        }
                Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[2]);
                Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[3]);
        }

-       
+

        /* Select second Dataflash chip (if present on selected board), send read status register command */
        #if (DATAFLASH_TOTALCHIPS == 2)
        Dataflash_SelectChip(DATAFLASH_CHIP2);
        Dataflash_SendByte(DF_CMD_GETSTATUS);
        /* Select second Dataflash chip (if present on selected board), send read status register command */
        #if (DATAFLASH_TOTALCHIPS == 2)
        Dataflash_SelectChip(DATAFLASH_CHIP2);
        Dataflash_SendByte(DF_CMD_GETSTATUS);

-       
+

        /* Check if sector protection is enabled */
        if (Dataflash_ReceiveByte() & DF_STATUS_SECTORPROTECTION_ON)
        {
        /* Check if sector protection is enabled */
        if (Dataflash_ReceiveByte() & DF_STATUS_SECTORPROTECTION_ON)
        {


@@ -494,7 +494,41 @@ void DataflashManager_ResetDataflashProtections(void)
                Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[3]);
        }
        #endif
                Dataflash_SendByte(DF_CMD_SECTORPROTECTIONOFF[3]);
        }
        #endif

-       
+

        /* Deselect current Dataflash chip */
        Dataflash_DeselectChip();
 }
        /* Deselect current Dataflash chip */
        Dataflash_DeselectChip();
 }

+
+/** Performs a simple test on the attached Dataflash IC(s) to ensure that they are working.
+ *
+ *  \return Boolean true if all media chips are working, false otherwise
+ */
+bool DataflashManager_CheckDataflashOperation(void)
+{
+       uint8_t ReturnByte;
+
+       /* Test first Dataflash IC is present and responding to commands */
+       Dataflash_SelectChip(DATAFLASH_CHIP1);
+       Dataflash_SendByte(DF_CMD_READMANUFACTURERDEVICEINFO);
+       ReturnByte = Dataflash_ReceiveByte();
+       Dataflash_DeselectChip();
+
+       /* If returned data is invalid, fail the command */
+       if (ReturnByte != DF_MANUFACTURER_ATMEL)
+         return false;
+
+       #if (DATAFLASH_TOTALCHIPS == 2)
+       /* Test second Dataflash IC is present and responding to commands */
+       Dataflash_SelectChip(DATAFLASH_CHIP2);
+       Dataflash_SendByte(DF_CMD_READMANUFACTURERDEVICEINFO);
+       ReturnByte = Dataflash_ReceiveByte();
+       Dataflash_DeselectChip();
+
+       /* If returned data is invalid, fail the command */
+       if (ReturnByte != DF_MANUFACTURER_ATMEL)
+         return false;
+       #endif
+
+       return true;
+}
+