mirror of https://github.com/qmk/qmk_firmware
203 lines
8.8 KiB
Plaintext
203 lines
8.8 KiB
Plaintext
|
/** \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 Printer 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>Printer Class</td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td><b>USB Subclass:</b></td>
|
||
|
|
* <td>Printer Subclass</td>
|
||
|
|
* </tr>
|
||
|
|
* <tr>
|
||
|
|
* <td><b>Relevant Standards:</b></td>
|
||
|
|
* <td>USBIF Printer 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 Generic Text Only Printer device, capable of reading and parsing
|
||
|
|
* "printed" plain-text Intel HEX files 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.
|
||
|
|
*
|
||
|
|
* \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 uses the Generic Text-Only printer drivers inbuilt into all modern operating systems, thus no
|
||
|
|
* additional drivers need to be supplied for correct operation.
|
||
|
|
*
|
||
|
|
* \section Sec_HostApp Host Controller Application
|
||
|
|
*
|
||
|
|
* This bootloader is compatible with Notepad under Windows, and the command line \c lpr utility under Linux.
|
||
|
|
*
|
||
|
|
* \subsection SSec_Notepad Notepad (Windows)
|
||
|
|
*
|
||
|
|
* While most text applications under Windows will be compatible with the bootloader, the inbuilt Notepad utility
|
||
|
|
* is recommended as it will introduce minimal formatting changes to the output stream. To program with Notepad,
|
||
|
|
* open the target HEX file and print it to the Generic Text Only printer device the bootloader creates.
|
||
|
|
*
|
||
|
|
* \subsection SSec_LPR LPR (Linux)
|
||
|
|
*
|
||
|
|
* While the CUPS framework under Linux will enumerate the bootloader as a Generic Text-Only printer, many
|
||
|
|
* applications will refuse to print to the device due to the lack of rich formatting options available. As a result,
|
||
|
|
* under Linux HEX files must be printed via the low level \c lpr utility instead.
|
||
|
|
*
|
||
|
|
* \code
|
||
|
|
* cat Mouse.hex | lpr
|
||
|
|
* \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.
|
||
|
|
*
|
||
|
|
* 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_PRINTER_SIGNATURE 0xDF20
|
||
|
|
*
|
||
|
|
* #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_PRINTER_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, new firmware fails to be sent to the device via CUPS.
|
||
|
|
* Only a limited subset of normal printer functionality is exposed via the
|
||
|
|
* bootloader, causing CUPS to reject print requests from applications that
|
||
|
|
* are unable to handle true plain-text printing. For best results, the low
|
||
|
|
* level \c lpr command should be used to print new firmware to the bootloader.
|
||
|
|
*
|
||
|
|
* \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>
|
||
|
|
* None
|
||
|
|
* </td>
|
||
|
|
* </tr>
|
||
|
|
* </table>
|
||
|
|
*/
|
||
|
|
|