*
* The following list indicates what microcontrollers are compatible with this demo.
*
- * - Series 7 USB AVRs (AT90USBxxx7)
- * - Series 6 USB AVRs (AT90USBxxx6)
- * - Series 4 USB AVRs (ATMEGAxxU4)
- * - Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2)
+ * \li Series 7 USB AVRs (AT90USBxxx7)
+ * \li Series 6 USB AVRs (AT90USBxxx6)
+ * \li Series 4 USB AVRs (ATMEGAxxU4) - <i>See \ref SSec_Aux_Space</i>
+ * \li Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2) - <i>See \ref SSec_Aux_Space</i>
*
* \section Sec_Info USB Information:
*
* <td>USBIF DFU Class Standard, Atmel USB Bootloader Datasheet</td>
* </tr>
* <tr>
- * <td><b>Usable Speeds:</b></td>
- * <td>Full Speed Mode</td>
+ * <td><b>Supported USB Speeds:</b></td>
+ * <td>Low Speed Mode \n
+ * Full Speed Mode</td>
* </tr>
* </table>
*
* When the bootloader is running, the board's LED(s) will flash at regular intervals to distinguish the
* bootloader from the normal user application.
*
+ * \section Sec_Running Running the Bootloader
+ *
+ * On the USB AVR8 devices, setting the \c HWBE device fuse will cause the bootloader to run if the \c HWB pin of
+ * the AVR is grounded when the device is reset.
+ *
+ * The are two behaviours of this bootloader, depending on the device's fuses:
+ *
+ * <b>If the device's BOOTRST fuse is set</b>, the bootloader will run any time the system is reset from
+ * the external reset pin, unless no valid user application has been loaded. To initiate the bootloader, the
+ * device's external reset pin should be grounded momentarily.
+ *
+ * <b>If the device's BOOTRST fuse is not set</b>, the bootloader will run only if initiated via a software
+ * jump, or if the \c HWB pin was low during the last device reset (if the \c HWBE fuse is set).
+ *
+ * For board specific exceptions to the above, see below.
+ *
+ * \subsection SSec_XPLAIN Atmel Xplain Board
+ * Ground the USB AVR JTAG's \c TCK pin to ground when powering on the board to start the bootloader. This assumes the
+ * \c HWBE fuse is cleared and the \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
+ *
+ * \subsection SSec_Leonardo Arduino Leonardo Board
+ * Ground \c IO13 when powering the board to start the bootloader. This assumes the \c HWBE fuse is cleared and the
+ * \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
+ *
* \section Sec_Installation Driver Installation
*
* This bootloader is designed to be compatible with Atmel's provided Windows DFU class drivers. You will need to
* 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)
* following layout:
*
* \code
- * #define BOOTLOADER_API_CALL(Index) (void*)(((FLASHEND - 32) + (2 * Index)) / 2)
+ * #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);
* uint8_t (*BootloaderAPI_ReadLock)(void) = BOOTLOADER_API_CALL(5);
* void (*BootloaderAPI_WriteLock)(uint8_t LockBits) = BOOTLOADER_API_CALL(6);
*
- * #define BOOTLOADER_MAGIC_SIGNATURE_START (FLASHEND - 2)
+ * #define BOOTLOADER_MAGIC_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 2))
* #define BOOTLOADER_MAGIC_SIGNATURE 0xDCFB
*
- * #define BOOTLOADER_CLASS_SIGNATURE_START (FLASHEND - 4)
- * #define BOOTLOADER_DFU_SIGNATURE 0xDFB1
+ * #define BOOTLOADER_CLASS_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 4))
+ * #define BOOTLOADER_DFU_SIGNATURE 0xDF10
*
- * #define BOOTLOADER_ADDRESS_START (FLASHEND - 8)
+ * #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_CDC_SIGNATURE. The start address of the bootloader can be retrieved by reading the bytes of FLASH
+ * 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.
+ *
* \section Sec_Options Project Options
*
* The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
*
* <table>
* <tr>
- * <td><b>Define Name:</b></td>
- * <td><b>Location:</b></td>
- * <td><b>Description:</b></td>
+ * <th><b>Define Name:</b></th>
+ * <th><b>Location:</b></th>
+ * <th><b>Description:</b></th>
* </tr>
* <tr>
* <td>SECURE_MODE</td>
- * <td>BootloaderDFU.h</td>
+ * <td>AppConfig.h</td>
* <td>If defined to \c true, the bootloader will not accept any memory commands other than a chip erase on start-up, until an
* erase has been performed. This can be used in conjunction with the AVR's lockbits to prevent the AVRs firmware from
- * being dumped by unauthorized persons.</td>
+ * being dumped by unauthorized persons. When false, all memory operations are allowed at any time.</td>
* </tr>
* </table>
*/
projects / pub / lufa.git / blobdiff