Fix up the incomplete Webserver project so that it integrates with the uIP stack...

[pub/USBasp.git] / Demos / Device / LowLevel / MassStorage / Lib / DataflashManager.c

diff --git a/Demos/Device/LowLevel/MassStorage/Lib/DataflashManager.c b/Demos/Device/LowLevel/MassStorage/Lib/DataflashManager.c
index c5035fe..4bfe757 100644 (file)
--- a/Demos/Device/LowLevel/MassStorage/Lib/DataflashManager.c
+++ b/Demos/Device/LowLevel/MassStorage/Lib/DataflashManager.c
@@ -1,21 +1,21 @@
 /*\r
              LUFA Library\r
 /*\r
              LUFA Library\r

-     Copyright (C) Dean Camera, 2009.\r
+     Copyright (C) Dean Camera, 2010.\r

               \r
   dean [at] fourwalledcubicle [dot] com\r
       www.fourwalledcubicle.com\r
 */\r
 \r
 /*\r
               \r
   dean [at] fourwalledcubicle [dot] com\r
       www.fourwalledcubicle.com\r
 */\r
 \r
 /*\r

-  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
-  Permission to use, copy, modify, and distribute this software\r
-  and its documentation for any purpose and without fee is hereby\r
-  granted, provided that the above copyright notice appear in all\r
-  copies and that both that the copyright notice and this\r
-  permission notice and warranty disclaimer appear in supporting\r
-  documentation, and that the name of the author not be used in\r
-  advertising or publicity pertaining to distribution of the\r
+  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+  Permission to use, copy, modify, distribute, and sell this \r
+  software and its documentation for any purpose is hereby granted\r
+  without fee, provided that the above copyright notice appear in \r
+  all copies and that both that the copyright notice and this\r
+  permission notice and warranty disclaimer appear in supporting \r
+  documentation, and that the name of the author not be used in \r
+  advertising or publicity pertaining to distribution of the \r

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


@@ -51,21 +51,26 @@ void DataflashManager_WriteBlocks(const uint32_t BlockAddress, uint16_t TotalBlo
        uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);\r
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r
        uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);\r
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r

+       bool     UsingSecondBuffer   = false;\r

 \r
 \r

-       /* Copy selected dataflash's current page contents to the dataflash buffer */\r
+       /* Select the correct starting Dataflash IC for the block requested */\r

        Dataflash_SelectChipFromPage(CurrDFPage);\r
        Dataflash_SelectChipFromPage(CurrDFPage);\r

+\r
+#if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)\r
+       /* Copy selected dataflash's current page contents to the dataflash buffer */\r

        Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);\r
        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
        Dataflash_WaitWhileBusy();\r
        Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);\r
        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
        Dataflash_WaitWhileBusy();\r

+#endif\r

 \r
        /* Send the dataflash buffer write command */\r
 \r
        /* Send the dataflash buffer write command */\r

-       Dataflash_ToggleSelectedChipCS();\r

        Dataflash_SendByte(DF_CMD_BUFF1WRITE);\r
        Dataflash_SendAddressBytes(0, CurrDFPageByte);\r
 \r
        /* Wait until endpoint is ready before continuing */\r
        Dataflash_SendByte(DF_CMD_BUFF1WRITE);\r
        Dataflash_SendAddressBytes(0, CurrDFPageByte);\r
 \r
        /* Wait until endpoint is ready before continuing */\r

-       while (!(Endpoint_IsReadWriteAllowed()));\r
-\r
+       if (Endpoint_WaitUntilReady())\r
+         return;\r
+       \r

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


@@ -80,41 +85,44 @@ void DataflashManager_WriteBlocks(const uint32_t BlockAddress, uint16_t TotalBlo
                                Endpoint_ClearOUT();\r
                                \r
                                /* Wait until the host has sent another packet */\r
                                Endpoint_ClearOUT();\r
                                \r
                                /* Wait until the host has sent another packet */\r

-                               while (!(Endpoint_IsReadWriteAllowed()));\r
+                               if (Endpoint_WaitUntilReady())\r
+                                 return;\r

                        }\r
 \r
                        /* Check if end of dataflash page reached */\r
                        if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))\r
                        {\r
                                /* Write the dataflash buffer contents back to the dataflash page */\r
                        }\r
 \r
                        /* Check if end of dataflash page reached */\r
                        if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))\r
                        {\r
                                /* Write the dataflash buffer contents back to the dataflash page */\r

-                               Dataflash_ToggleSelectedChipCS();\r
-                               Dataflash_SendByte(DF_CMD_BUFF1TOMAINMEMWITHERASE);\r
+                               Dataflash_WaitWhileBusy();\r
+                               Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);\r

                                Dataflash_SendAddressBytes(CurrDFPage, 0);\r
 \r
                                /* Reset the dataflash buffer counter, increment the page counter */\r
                                CurrDFPageByteDiv16 = 0;\r
                                CurrDFPage++;\r
 \r
                                Dataflash_SendAddressBytes(CurrDFPage, 0);\r
 \r
                                /* Reset the dataflash buffer counter, increment the page counter */\r
                                CurrDFPageByteDiv16 = 0;\r
                                CurrDFPage++;\r
 \r

+                               /* Once all the dataflash ICs have had their first buffers filled, switch buffers to maintain throughput */\r
+                               if (Dataflash_GetSelectedChip() == DATAFLASH_CHIP_MASK(DATAFLASH_TOTALCHIPS))\r
+                                 UsingSecondBuffer = !(UsingSecondBuffer);\r
+\r

                                /* Select the next dataflash chip based on the new dataflash page index */\r
                                Dataflash_SelectChipFromPage(CurrDFPage);\r
                                /* Select the next dataflash chip based on the new dataflash page index */\r
                                Dataflash_SelectChipFromPage(CurrDFPage);\r

-                               Dataflash_WaitWhileBusy();\r

 \r
 #if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)\r
                                /* If less than one dataflash page remaining, copy over the existing page to preserve trailing data */\r
                                if ((TotalBlocks * (VIRTUAL_MEMORY_BLOCK_SIZE >> 4)) < (DATAFLASH_PAGE_SIZE >> 4))\r
                                {\r
                                        /* Copy selected dataflash's current page contents to the dataflash buffer */\r
 \r
 #if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)\r
                                /* If less than one dataflash page remaining, copy over the existing page to preserve trailing data */\r
                                if ((TotalBlocks * (VIRTUAL_MEMORY_BLOCK_SIZE >> 4)) < (DATAFLASH_PAGE_SIZE >> 4))\r
                                {\r
                                        /* Copy selected dataflash's current page contents to the dataflash buffer */\r

-                                       Dataflash_ToggleSelectedChipCS();\r
-                                       Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);\r
+                                       Dataflash_WaitWhileBusy();\r
+                                       Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_MAINMEMTOBUFF2 : DF_CMD_MAINMEMTOBUFF1);\r

                                        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
                                        Dataflash_WaitWhileBusy();\r
                                }\r
 #endif\r
 \r
                                /* Send the dataflash buffer write command */\r
                                        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
                                        Dataflash_WaitWhileBusy();\r
                                }\r
 #endif\r
 \r
                                /* Send the dataflash buffer write command */\r

-                               Dataflash_ToggleSelectedChipCS();\r
-                               Dataflash_SendByte(DF_CMD_BUFF1WRITE);\r
-                               Dataflash_SendAddressBytes(0, 0);\r
+                               Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2WRITE : DF_CMD_BUFF1WRITE);\r
+                               Dataflash_SendAddressBytes(0, 0);                               \r

                        }\r
 \r
                        /* Write one 16-byte chunk of data to the dataflash */\r
                        }\r
 \r
                        /* Write one 16-byte chunk of data to the dataflash */\r


@@ -151,8 +159,8 @@ void DataflashManager_WriteBlocks(const uint32_t BlockAddress, uint16_t TotalBlo
        }\r
 \r
        /* Write the dataflash buffer contents back to the dataflash page */\r
        }\r
 \r
        /* Write the dataflash buffer contents back to the dataflash page */\r

-       Dataflash_ToggleSelectedChipCS();\r
-       Dataflash_SendByte(DF_CMD_BUFF1TOMAINMEMWITHERASE);\r
+       Dataflash_WaitWhileBusy();\r
+       Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);\r

        Dataflash_SendAddressBytes(CurrDFPage, 0x00);\r
        Dataflash_WaitWhileBusy();\r
 \r
        Dataflash_SendAddressBytes(CurrDFPage, 0x00);\r
        Dataflash_WaitWhileBusy();\r
 \r


@@ -177,8 +185,10 @@ void DataflashManager_ReadBlocks(const uint32_t BlockAddress, uint16_t TotalBloc
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r
 \r
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r
 \r

-       /* Send the dataflash main memory page read command */\r
+       /* Select the correct starting Dataflash IC for the block requested */\r

        Dataflash_SelectChipFromPage(CurrDFPage);\r
        Dataflash_SelectChipFromPage(CurrDFPage);\r

+\r
+       /* Send the dataflash main memory page read command */\r

        Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);\r
        Dataflash_SendAddressBytes(CurrDFPage, CurrDFPageByte);\r
        Dataflash_SendByte(0x00);\r
        Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);\r
        Dataflash_SendAddressBytes(CurrDFPage, CurrDFPageByte);\r
        Dataflash_SendByte(0x00);\r


@@ -187,7 +197,8 @@ void DataflashManager_ReadBlocks(const uint32_t BlockAddress, uint16_t TotalBloc
        Dataflash_SendByte(0x00);\r
        \r
        /* Wait until endpoint is ready before continuing */\r
        Dataflash_SendByte(0x00);\r
        \r
        /* Wait until endpoint is ready before continuing */\r

-       while (!(Endpoint_IsReadWriteAllowed()));\r
+       if (Endpoint_WaitUntilReady())\r
+         return;\r

        \r
        while (TotalBlocks)\r
        {\r
        \r
        while (TotalBlocks)\r
        {\r


@@ -203,7 +214,8 @@ void DataflashManager_ReadBlocks(const uint32_t BlockAddress, uint16_t TotalBloc
                                Endpoint_ClearIN();\r
                                \r
                                /* Wait until the endpoint is ready for more data */\r
                                Endpoint_ClearIN();\r
                                \r
                                /* Wait until the endpoint is ready for more data */\r

-                               while (!(Endpoint_IsReadWriteAllowed()));\r
+                               if (Endpoint_WaitUntilReady())\r
+                                 return;\r

                        }\r
                        \r
                        /* Check if end of dataflash page reached */\r
                        }\r
                        \r
                        /* Check if end of dataflash page reached */\r


@@ -280,15 +292,19 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress, uint16_t Tota
        uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);\r
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r
        uint16_t CurrDFPage          = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) / DATAFLASH_PAGE_SIZE);\r
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r

+       bool     UsingSecondBuffer   = false;\r

 \r
 \r

-       /* Copy selected dataflash's current page contents to the dataflash buffer */\r
+       /* Select the correct starting Dataflash IC for the block requested */\r

        Dataflash_SelectChipFromPage(CurrDFPage);\r
        Dataflash_SelectChipFromPage(CurrDFPage);\r

+\r
+#if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)\r
+       /* Copy selected dataflash's current page contents to the dataflash buffer */\r

        Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);\r
        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
        Dataflash_WaitWhileBusy();\r
        Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);\r
        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
        Dataflash_WaitWhileBusy();\r

+#endif\r

 \r
        /* Send the dataflash buffer write command */\r
 \r
        /* Send the dataflash buffer write command */\r

-       Dataflash_ToggleSelectedChipCS();\r

        Dataflash_SendByte(DF_CMD_BUFF1WRITE);\r
        Dataflash_SendAddressBytes(0, CurrDFPageByte);\r
 \r
        Dataflash_SendByte(DF_CMD_BUFF1WRITE);\r
        Dataflash_SendAddressBytes(0, CurrDFPageByte);\r
 \r


@@ -303,25 +319,28 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress, uint16_t Tota
                        if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))\r
                        {\r
                                /* Write the dataflash buffer contents back to the dataflash page */\r
                        if (CurrDFPageByteDiv16 == (DATAFLASH_PAGE_SIZE >> 4))\r
                        {\r
                                /* Write the dataflash buffer contents back to the dataflash page */\r

-                               Dataflash_ToggleSelectedChipCS();\r
-                               Dataflash_SendByte(DF_CMD_BUFF1TOMAINMEMWITHERASE);\r
+                               Dataflash_WaitWhileBusy();\r
+                               Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);\r

                                Dataflash_SendAddressBytes(CurrDFPage, 0);\r
 \r
                                /* Reset the dataflash buffer counter, increment the page counter */\r
                                CurrDFPageByteDiv16 = 0;\r
                                CurrDFPage++;\r
 \r
                                Dataflash_SendAddressBytes(CurrDFPage, 0);\r
 \r
                                /* Reset the dataflash buffer counter, increment the page counter */\r
                                CurrDFPageByteDiv16 = 0;\r
                                CurrDFPage++;\r
 \r

+                               /* Once all the dataflash ICs have had their first buffers filled, switch buffers to maintain throughput */\r
+                               if (Dataflash_GetSelectedChip() == DATAFLASH_CHIP_MASK(DATAFLASH_TOTALCHIPS))\r
+                                 UsingSecondBuffer = !(UsingSecondBuffer);\r
+\r

                                /* Select the next dataflash chip based on the new dataflash page index */\r
                                Dataflash_SelectChipFromPage(CurrDFPage);\r
                                /* Select the next dataflash chip based on the new dataflash page index */\r
                                Dataflash_SelectChipFromPage(CurrDFPage);\r

-                               Dataflash_WaitWhileBusy();\r

 \r
 #if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)\r
                                /* If less than one dataflash page remaining, copy over the existing page to preserve trailing data */\r
                                if ((TotalBlocks * (VIRTUAL_MEMORY_BLOCK_SIZE >> 4)) < (DATAFLASH_PAGE_SIZE >> 4))\r
                                {\r
                                        /* Copy selected dataflash's current page contents to the dataflash buffer */\r
 \r
 #if (DATAFLASH_PAGE_SIZE > VIRTUAL_MEMORY_BLOCK_SIZE)\r
                                /* If less than one dataflash page remaining, copy over the existing page to preserve trailing data */\r
                                if ((TotalBlocks * (VIRTUAL_MEMORY_BLOCK_SIZE >> 4)) < (DATAFLASH_PAGE_SIZE >> 4))\r
                                {\r
                                        /* Copy selected dataflash's current page contents to the dataflash buffer */\r

-                                       Dataflash_ToggleSelectedChipCS();\r
-                                       Dataflash_SendByte(DF_CMD_MAINMEMTOBUFF1);\r
+                                       Dataflash_WaitWhileBusy();\r
+                                       Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_MAINMEMTOBUFF2 : DF_CMD_MAINMEMTOBUFF1);\r

                                        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
                                        Dataflash_WaitWhileBusy();\r
                                }\r
                                        Dataflash_SendAddressBytes(CurrDFPage, 0);\r
                                        Dataflash_WaitWhileBusy();\r
                                }\r


@@ -341,11 +360,7 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress, uint16_t Tota
                        CurrDFPageByteDiv16++;\r
 \r
                        /* Increment the block 16 byte block counter */\r
                        CurrDFPageByteDiv16++;\r
 \r
                        /* Increment the block 16 byte block counter */\r

-                       BytesInBlockDiv16++;\r
-\r
-                       /* Check if the current command is being aborted by the host */\r
-                       if (IsMassStoreReset)\r
-                         return;                       \r
+                       BytesInBlockDiv16++;            \r

                }\r
                        \r
                /* Decrement the blocks remaining counter and reset the sub block counter */\r
                }\r
                        \r
                /* Decrement the blocks remaining counter and reset the sub block counter */\r


@@ -353,8 +368,8 @@ void DataflashManager_WriteBlocks_RAM(const uint32_t BlockAddress, uint16_t Tota
        }\r
 \r
        /* Write the dataflash buffer contents back to the dataflash page */\r
        }\r
 \r
        /* Write the dataflash buffer contents back to the dataflash page */\r

-       Dataflash_ToggleSelectedChipCS();\r
-       Dataflash_SendByte(DF_CMD_BUFF1TOMAINMEMWITHERASE);\r
+       Dataflash_WaitWhileBusy();\r
+       Dataflash_SendByte(UsingSecondBuffer ? DF_CMD_BUFF2TOMAINMEMWITHERASE : DF_CMD_BUFF1TOMAINMEMWITHERASE);\r

        Dataflash_SendAddressBytes(CurrDFPage, 0x00);\r
        Dataflash_WaitWhileBusy();\r
 \r
        Dataflash_SendAddressBytes(CurrDFPage, 0x00);\r
        Dataflash_WaitWhileBusy();\r
 \r


@@ -377,8 +392,10 @@ void DataflashManager_ReadBlocks_RAM(const uint32_t BlockAddress, uint16_t Total
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r
 \r
        uint16_t CurrDFPageByte      = ((BlockAddress * VIRTUAL_MEMORY_BLOCK_SIZE) % DATAFLASH_PAGE_SIZE);\r
        uint8_t  CurrDFPageByteDiv16 = (CurrDFPageByte >> 4);\r
 \r

-       /* Send the dataflash main memory page read command */\r
+       /* Select the correct starting Dataflash IC for the block requested */\r

        Dataflash_SelectChipFromPage(CurrDFPage);\r
        Dataflash_SelectChipFromPage(CurrDFPage);\r

+\r
+       /* Send the dataflash main memory page read command */\r

        Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);\r
        Dataflash_SendAddressBytes(CurrDFPage, CurrDFPageByte);\r
        Dataflash_SendByte(0x00);\r
        Dataflash_SendByte(DF_CMD_MAINMEMPAGEREAD);\r
        Dataflash_SendAddressBytes(CurrDFPage, CurrDFPageByte);\r
        Dataflash_SendByte(0x00);\r


@@ -421,10 +438,6 @@ void DataflashManager_ReadBlocks_RAM(const uint32_t BlockAddress, uint16_t Total
                        \r
                        /* Increment the block 16 byte block counter */\r
                        BytesInBlockDiv16++;\r
                        \r
                        /* Increment the block 16 byte block counter */\r
                        BytesInBlockDiv16++;\r

-\r
-                       /* Check if the current command is being aborted by the host */\r
-                       if (IsMassStoreReset)\r
-                         return;\r

                }\r
                \r
                /* Decrement the blocks remaining counter */\r
                }\r
                \r
                /* Decrement the blocks remaining counter */\r


@@ -475,3 +488,36 @@ void DataflashManager_ResetDataflashProtections(void)
        /* Deselect current dataflash chip */\r
        Dataflash_DeselectChip();\r
 }\r
        /* Deselect current dataflash chip */\r
        Dataflash_DeselectChip();\r
 }\r

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