mirror of
https://github.com/Keychron/qmk_firmware.git
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203 lines
8.8 KiB
Plaintext
203 lines
8.8 KiB
Plaintext
/** \file
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*
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* This file contains special DoxyGen information for the generation of the main page and other special
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* documentation pages. It is not a project source file.
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*/
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/** \mainpage Printer Class USB AVR Bootloader
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*
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* \section Sec_Compat Demo Compatibility:
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*
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* The following list indicates what microcontrollers are compatible with this demo.
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*
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* \li Series 7 USB AVRs (AT90USBxxx7)
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* \li Series 6 USB AVRs (AT90USBxxx6)
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* \li Series 4 USB AVRs (ATMEGAxxU4)
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* \li Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2)
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*
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* \section Sec_Info USB Information:
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*
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* The following table gives a rundown of the USB utilization of this demo.
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*
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* <table>
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* <tr>
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* <td><b>USB Mode:</b></td>
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* <td>Device</td>
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* </tr>
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* <tr>
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* <td><b>USB Class:</b></td>
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* <td>Printer Class</td>
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* </tr>
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* <tr>
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* <td><b>USB Subclass:</b></td>
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* <td>Printer Subclass</td>
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* </tr>
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* <tr>
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* <td><b>Relevant Standards:</b></td>
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* <td>USBIF Printer Class Standard</td>
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* </tr>
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* <tr>
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* <td><b>Supported USB Speeds:</b></td>
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* <td>Full Speed Mode</td>
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* </tr>
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* </table>
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*
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* \section Sec_Description Project Description:
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*
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* This bootloader enumerates to the host as a Generic Text Only Printer device, capable of reading and parsing
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* "printed" plain-text Intel HEX files to load firmware onto the AVR.
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*
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* Out of the box this bootloader builds for the AT90USB1287 with an 8KB bootloader section size, and will fit
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* into 4KB of bootloader space. If you wish to alter this size and/or change the AVR model, you will need to
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* edit the MCU, FLASH_SIZE_KB and BOOT_SECTION_SIZE_KB values in the accompanying makefile.
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*
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* When the bootloader is running, the board's LED(s) will flash at regular intervals to distinguish the
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* bootloader from the normal user application.
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*
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* \section Sec_Running Running the Bootloader
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*
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* On the USB AVR8 devices, setting the \c HWBE device fuse will cause the bootloader to run if the \c HWB pin of
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* the AVR is grounded when the device is reset.
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*
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* The are two behaviours of this bootloader, depending on the device's fuses:
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*
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* <b>If the device's BOOTRST fuse is set</b>, the bootloader will run any time the system is reset from
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* the external reset pin, unless no valid user application has been loaded. To initiate the bootloader, the
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* device's external reset pin should be grounded momentarily.
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*
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* <b>If the device's BOOTRST fuse is not set</b>, the bootloader will run only if initiated via a software
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* jump, or if the \c HWB pin was low during the last device reset (if the \c HWBE fuse is set).
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*
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* For board specific exceptions to the above, see below.
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*
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* \subsection SSec_XPLAIN Atmel Xplain Board
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* Ground the USB AVR JTAG's \c TCK pin to ground when powering on the board to start the bootloader. This assumes the
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* \c HWBE fuse is cleared and the \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
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*
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* \subsection SSec_Leonardo Arduino Leonardo Board
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* Ground \c IO13 when powering the board to start the bootloader. This assumes the \c HWBE fuse is cleared and the
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* \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
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*
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* \section Sec_Installation Driver Installation
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*
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* This bootloader uses the Generic Text-Only printer drivers inbuilt into all modern operating systems, thus no
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* additional drivers need to be supplied for correct operation.
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*
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* \section Sec_HostApp Host Controller Application
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*
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* This bootloader is compatible with Notepad under Windows, and the command line \c lpr utility under Linux.
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*
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* \subsection SSec_Notepad Notepad (Windows)
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*
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* While most text applications under Windows will be compatible with the bootloader, the inbuilt Notepad utility
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* is recommended as it will introduce minimal formatting changes to the output stream. To program with Notepad,
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* open the target HEX file and print it to the Generic Text Only printer device the bootloader creates.
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*
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* \subsection SSec_LPR LPR (Linux)
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*
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* While the CUPS framework under Linux will enumerate the bootloader as a Generic Text-Only printer, many
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* applications will refuse to print to the device due to the lack of rich formatting options available. As a result,
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* under Linux HEX files must be printed via the low level \c lpr utility instead.
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*
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* \code
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* cat Mouse.hex | lpr
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* \endcode
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*
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* \section Sec_API User Application API
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*
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* Several user application functions for FLASH and other special memory area manipulations are exposed by the bootloader,
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* allowing the user application to call into the bootloader at runtime to read and write FLASH data.
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*
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* By default, the bootloader API jump table is located 32 bytes from the end of the device's FLASH memory, and follows the
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* following layout:
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*
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* \code
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* #define BOOTLOADER_API_TABLE_SIZE 32
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* #define BOOTLOADER_API_TABLE_START ((FLASHEND + 1UL) - BOOTLOADER_API_TABLE_SIZE)
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* #define BOOTLOADER_API_CALL(Index) (void*)((BOOTLOADER_API_TABLE_START + (Index * 2)) / 2)
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*
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* void (*BootloaderAPI_ErasePage)(uint32_t Address) = BOOTLOADER_API_CALL(0);
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* void (*BootloaderAPI_WritePage)(uint32_t Address) = BOOTLOADER_API_CALL(1);
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* void (*BootloaderAPI_FillWord)(uint32_t Address, uint16_t Word) = BOOTLOADER_API_CALL(2);
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* uint8_t (*BootloaderAPI_ReadSignature)(uint16_t Address) = BOOTLOADER_API_CALL(3);
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* uint8_t (*BootloaderAPI_ReadFuse)(uint16_t Address) = BOOTLOADER_API_CALL(4);
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* uint8_t (*BootloaderAPI_ReadLock)(void) = BOOTLOADER_API_CALL(5);
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* void (*BootloaderAPI_WriteLock)(uint8_t LockBits) = BOOTLOADER_API_CALL(6);
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*
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* #define BOOTLOADER_MAGIC_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 2))
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* #define BOOTLOADER_MAGIC_SIGNATURE 0xDCFB
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*
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* #define BOOTLOADER_CLASS_SIGNATURE_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 4))
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* #define BOOTLOADER_PRINTER_SIGNATURE 0xDF20
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*
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* #define BOOTLOADER_ADDRESS_START (BOOTLOADER_API_TABLE_START + (BOOTLOADER_API_TABLE_SIZE - 8))
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* #define BOOTLOADER_ADDRESS_LENGTH 4
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* \endcode
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*
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* From the application the API support of the bootloader can be detected by reading the FLASH memory bytes located at address
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* \c BOOTLOADER_MAGIC_SIGNATURE_START and comparing them to the value \c BOOTLOADER_MAGIC_SIGNATURE. The class of bootloader
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* can be determined by reading the FLASH memory bytes located at address \c BOOTLOADER_CLASS_SIGNATURE_START and comparing them
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* to the value \c BOOTLOADER_PRINTER_SIGNATURE. The start address of the bootloader can be retrieved by reading the bytes of FLASH
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* memory starting from address \c BOOTLOADER_ADDRESS_START.
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*
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* \subsection SSec_API_MemLayout Device Memory Map
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* The following illustration indicates the final memory map of the device when loaded with the bootloader.
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*
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* \verbatim
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* +----------------------------+ 0x0000
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* | |
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* | |
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* | |
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* | |
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* | |
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* | |
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* | |
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* | |
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* | User Application |
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* | |
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* | |
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* | |
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* | |
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* | |
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* | |
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* | |
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* +----------------------------+ FLASHEND - BOOT_SECTION_SIZE
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* | |
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* | Bootloader Application |
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* | (Not User App. Accessible) |
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* | |
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* +----------------------------+ FLASHEND - 96
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* | API Table Trampolines |
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* | (Not User App. Accessible) |
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* +----------------------------+ FLASHEND - 32
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* | Bootloader API Table |
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* | (User App. Accessible) |
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* +----------------------------+ FLASHEND - 8
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* | Bootloader ID Constants |
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* | (User App. Accessible) |
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* +----------------------------+ FLASHEND
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* \endverbatim
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*
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*
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* \section Sec_KnownIssues Known Issues:
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*
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* \par On Linux machines, new firmware fails to be sent to the device via CUPS.
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* Only a limited subset of normal printer functionality is exposed via the
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* bootloader, causing CUPS to reject print requests from applications that
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* are unable to handle true plain-text printing. For best results, the low
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* level \c lpr command should be used to print new firmware to the bootloader.
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*
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* \section Sec_Options Project Options
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*
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* The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.
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*
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* <table>
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* <tr>
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* <td>
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* None
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* </td>
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* </tr>
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* </table>
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*/
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