+ * \note This device spoofs Atmel's DFU Bootloader USB VID and PID so that the Atmel DFU bootloader
+ * drivers included with FLIP will work. If you do not wish to use Atmel's ID codes, please
+ * manually change them in Descriptors.c and alter your driver's INF file accordingly.
+ *
+ * \section Sec_HostApp Host Controller Application
+ *
+ * This bootloader is compatible with Atmel's FLIP utility on Windows machines, and dfu-programmer on Linux machines.
+ *
+ * \subsection SSec_FLIP FLIP (Windows)
+ *
+ * FLIP (Flexible In-System Programmer) is a utility written by Atmel, and distributed for free on the Atmel website.
+ * The FLIP utility is designed to assist in the bootloader programming of a range of Atmel devices, through several
+ * popular physical interfaces including USB. It is written in Java, however makes use of native extensions for USB
+ * support and thus is only offered on Windows.
+ *
+ * To program a device using FLIP, refer to the Atmel FLIP documentation.
+ *
+ * \subsection SSec_DFUProgrammer dfu-programmer (Linux)
+ *
+ * dfu-programmer is an open-source command line solution for the bootloader programming of Atmel devices through a
+ * USB connection, using the DFU protocol, available for download at <a>http://sourceforge.net/projects/dfu-programmer/</a>.
+ *
+ * The following example loads a HEX file into the AVR's FLASH memory using dfu-programmer:
+ * \code
+ * dfu-programmer at90usb1287 erase flash Mouse.hex
+ * \endcode
+ *
+ * \section Sec_API User Application API
+ *
+ * Several user application functions for FLASH and other special memory area manipulations are exposed by the bootloader,
+ * allowing the user application to call into the bootloader at runtime to read and write FLASH data.
+ *
+ * \warning The APIs exposed by the DFU class bootloader are \b NOT compatible with the API exposed by the official Atmel DFU bootloader.
+ *
+ * By default, the bootloader API jump table is located 32 bytes from the end of the device's FLASH memory, and follows the
+ * following layout:
+ *
+ * \code
+ * #define BOOTLOADER_API_TABLE_SIZE 32
+ * #define BOOTLOADER_API_TABLE_START ((FLASHEND + 1UL) - BOOTLOADER_API_TABLE_SIZE)
+ * #define BOOTLOADER_API_CALL(Index) (void*)((BOOTLOADER_API_TABLE_START + (Index * 2)) / 2)
+ *
+ * void (*BootloaderAPI_ErasePage)(uint32_t Address) = BOOTLOADER_API_CALL(0);
+ * void (*BootloaderAPI_WritePage)(uint32_t Address) = BOOTLOADER_API_CALL(1);
+ * void (*BootloaderAPI_FillWord)(uint32_t Address, uint16_t Word) = BOOTLOADER_API_CALL(2);
+ * uint8_t (*BootloaderAPI_ReadSignature)(uint16_t Address) = BOOTLOADER_API_CALL(3);
+ * uint8_t (*BootloaderAPI_ReadFuse)(uint16_t Address) = BOOTLOADER_API_CALL(4);
+ * uint8_t (*BootloaderAPI_ReadLock)(void) = BOOTLOADER_API_CALL(5);
+ * void (*BootloaderAPI_WriteLock)(uint8_t LockBits) = BOOTLOADER_API_CALL(6);
+ *
+ * #define BOOTLOADER_MAGIC_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 2))
+ * #define BOOTLOADER_MAGIC_SIGNATURE 0xDCFB
+ *
+ * #define BOOTLOADER_CLASS_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 4))
+ * #define BOOTLOADER_DFU_SIGNATURE 0xDF10
+ *
+ * #define BOOTLOADER_ADDRESS_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 8))
+ * #define BOOTLOADER_ADDRESS_LENGTH 4
+ * \endcode
+ *
+ * From the application the API support of the bootloader can be detected by reading the FLASH memory bytes located at address
+ * \c BOOTLOADER_MAGIC_SIGNATURE_START and comparing them to the value \c BOOTLOADER_MAGIC_SIGNATURE. The class of bootloader
+ * can be determined by reading the FLASH memory bytes located at address \c BOOTLOADER_CLASS_SIGNATURE_START and comparing them
+ * to the value \c BOOTLOADER_DFU_SIGNATURE. The start address of the bootloader can be retrieved by reading the bytes of FLASH
+ * memory starting from address \c BOOTLOADER_ADDRESS_START.
+ *
+ * \subsection SSec_API_MemLayout Device Memory Map
+ * The following illustration indicates the final memory map of the device when loaded with the bootloader.
+ *
+ * \verbatim
+ * +----------------------------+ 0x0000
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | User Application |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * | |
+ * +----------------------------+ FLASHEND - BOOT_AUX_SECTION_SIZE
+ * | Booloader Start Trampoline |
+ * | (Not User App. Accessible) |
+ * +----------------------------+ FLASHEND - (BOOT_AUX_SECTION_SIZE - 4)
+ * | |
+ * | Auxillery Bootloader |
+ * | Space for Smaller Devices |
+ * | (Not User App. Accessible) |
+ * | |
+ * +----------------------------+ FLASHEND - BOOT_SECTION_SIZE
+ * | |
+ * | Bootloader Application |
+ * | (Not User App. Accessible) |
+ * | |
+ * +----------------------------+ FLASHEND - 96
+ * | API Table Trampolines |
+ * | (Not User App. Accessible) |
+ * +----------------------------+ FLASHEND - 32
+ * | Bootloader API Table |
+ * | (User App. Accessible) |
+ * +----------------------------+ FLASHEND - 8
+ * | Bootloader ID Constants |
+ * | (User App. Accessible) |
+ * +----------------------------+ FLASHEND
+ * \endverbatim
+ *
+ * \subsection SSec_Aux_Space Auxiliary Bootloader Section
+ * To make the bootloader function on smaller devices (those with a physical
+ * bootloader section of smaller than 6KB)
+ *
+ * \section Sec_KnownIssues Known Issues:
+ *
+ * \par On Linux machines, the DFU bootloader is inaccessible.
+ * On many Linux systems, non-root users do not have automatic access to newly
+ * inserted DFU devices. Root privileges or a UDEV rule is required to gain
+ * access.
+ * See <a href=https://groups.google.com/d/msg/lufa-support/CP9cy2bc8yo/kBqsOu-RBeMJ>here</a> for resolution steps.
projects / pub / lufa.git / blobdiff