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Diffstat (limited to 'lib/lufa/Bootloaders/CDC/BootloaderCDC.txt')
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diff --git a/lib/lufa/Bootloaders/CDC/BootloaderCDC.txt b/lib/lufa/Bootloaders/CDC/BootloaderCDC.txt new file mode 100644 index 000000000..f8c349cde --- /dev/null +++ b/lib/lufa/Bootloaders/CDC/BootloaderCDC.txt @@ -0,0 +1,242 @@ +/** \file + * + * This file contains special DoxyGen information for the generation of the main page and other special + * documentation pages. It is not a project source file. + */ + +/** \mainpage CDC Class USB AVR Bootloader + * + * \section Sec_Compat Demo Compatibility: + * + * The following list indicates what microcontrollers are compatible with this demo. + * + * \li Series 7 USB AVRs (AT90USBxxx7) + * \li Series 6 USB AVRs (AT90USBxxx6) + * \li Series 4 USB AVRs (ATMEGAxxU4) + * \li Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2) + * + * \section Sec_Info USB Information: + * + * The following table gives a rundown of the USB utilization of this demo. + * + * <table> + * <tr> + * <td><b>USB Mode:</b></td> + * <td>Device</td> + * </tr> + * <tr> + * <td><b>USB Class:</b></td> + * <td>Communications Device Class (CDC)</td> + * </tr> + * <tr> + * <td><b>USB Subclass:</b></td> + * <td>Abstract Control Model (ACM)</td> + * </tr> + * <tr> + * <td><b>Relevant Standards:</b></td> + * <td>USBIF CDC Class Standard</td> + * </tr> + * <tr> + * <td><b>Supported USB Speeds:</b></td> + * <td>Full Speed Mode</td> + * </tr> + * </table> + * + * \section Sec_Description Project Description: + * + * This bootloader enumerates to the host as a CDC Class device (virtual serial port), allowing for AVR109 + * protocol compatible programming software to load firmware onto the AVR. + * + * Out of the box this bootloader builds for the AT90USB1287 with an 8KB bootloader section size, and will fit + * into 4KB of bootloader space. If you wish to alter this size and/or change the AVR model, you will need to + * edit the MCU, FLASH_SIZE_KB and BOOT_SECTION_SIZE_KB values in the accompanying makefile. + * + * When the bootloader is running, the board's LED(s) will flash at regular intervals to distinguish the + * bootloader from the normal user application. + * + * \warning <b>THIS BOOTLOADER IS NOT SECURE.</b> Malicious entities can recover written data, even if the device + * lockbits are set. + * + * \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 + * + * After running this bootloader for the first time on a new computer, you will need to supply the .INF + * file located in this bootloader project's directory as the device's driver when running under Windows. + * This will enable Windows to use its inbuilt CDC drivers, negating the need for custom drivers for the + * device. Other Operating Systems should automatically use their own inbuilt CDC-ACM drivers. + * + * \section Sec_HostApp Host Controller Application + * + * This bootloader is compatible with the open source application AVRDUDE, Atmel's AVRPROG, or other + * applications implementing the AVR109 protocol, which is documented on the Atmel website as an application + * note. + * + * \subsection SSec_AVRDude AVRDUDE (Windows, Mac, Linux) + * + * AVRDude is a free, cross-platform and open source command line programmer for Atmel and third party AVR + * programmers. It is available on the the Windows platform as part of the "WinAVR" package, or on other systems + * either from a build from the official source code, or in many distributions as a precompiled binary package. + * + * To load a new HEX file with AVRDude, specify "AVR109" as the programmer, with the allocated COM port. On Windows + * platforms this will be a COMx port name: + * \code + * avrdude -c AVR109 -p at90usb1287 -P COM0 -U flash:w:Mouse.hex + * \endcode + * + * On Linux systems, this will typically be a /dev/ttyACMx port name: + * \code + * avrdude -c AVR109 -p at90usb1287 -P /dev/ttyACM0 -U flash:w:Mouse.hex + * \endcode + * + * Refer to the AVRDude project documentation for additional usage instructions. + * + * \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. + * + * 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_CDC_SIGNATURE 0xDF00 + * + * #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 + * 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_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 + * + * \section Sec_KnownIssues Known Issues: + * + * \par On Linux machines, the CDC bootloader is unstable or inaccessible. + * A change to the \c ModemManager module in many Linux distributions causes + * this module to try to take control over inserted CDC devices, corrupting the + * datastream. A UDEV rule is required to prevent this. + * See <a href=https://groups.google.com/d/msg/lufa-support/CP9cy2bc8yo/kBqsOu-RBeMJ>here</a> for resolution steps. + * If the issue still persists then uninstall modemmanager by executing <tt>sudo apt-get remove modemmanager</tt>, or + * the equivalent using your chosen distribution's package manager. + * + * \par On Linux machines, the CDC bootloader is inaccessible. + * On many Linux systems, non-root users do not have automatic access to newly + * inserted CDC 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> + * <th><b>Define Name:</b></th> + * <th><b>Location:</b></th> + * <th><b>Description:</b></th> + * </tr> + * <tr> + * <td>NO_BLOCK_SUPPORT</td> + * <td>AppConfig.h</td> + * <td>Define to disable memory block read/write support in the bootloader, requiring all reads and writes to be made + * using the byte-level commands.</td> + * </tr> + * <tr> + * <td>NO_EEPROM_BYTE_SUPPORT</td> + * <td>AppConfig.h</td> + * <td>Define to disable EEPROM memory byte read/write support in the bootloader, requiring all EEPROM reads and writes + * to be made using the block-level commands.</td> + * </tr> + * <tr> + * <td>NO_FLASH_BYTE_SUPPORT</td> + * <td>AppConfig.h</td> + * <td>Define to disable FLASH memory byte read/write support in the bootloader, requiring all FLASH reads and writes + * to be made using the block-level commands.</td> + * </tr> + * <tr> + * <td>NO_LOCK_BYTE_WRITE_SUPPORT</td> + * <td>AppConfig.h</td> + * <td>Define to disable lock byte write support in the bootloader, preventing the lock bits from being set programmatically.</td> + * </tr> + * </table> + */ + |