212 lines
6.8 KiB
C
212 lines
6.8 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2019.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2019 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the HID class bootloader. This file contains the complete bootloader logic.
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*/
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#include "BootloaderHID.h"
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/** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
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* via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application
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* started via a forced watchdog reset.
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*/
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static bool RunBootloader = true;
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/** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
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* will start if the /HWB line of the AVR is held low and the system is reset. However, if the /HWB line is still held
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* low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
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* \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
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*/
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uint16_t MagicBootKey ATTR_NO_INIT;
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/** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
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* start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
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* this will force the user application to start via a software jump.
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*/
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void Application_Jump_Check(void)
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{
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/* If the reset source was the bootloader and the key is correct, clear it and jump to the application */
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if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
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{
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/* Turn off the watchdog */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Clear the boot key and jump to the user application */
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MagicBootKey = 0;
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// cppcheck-suppress constStatement
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((void (*)(void))0x0000)();
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}
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}
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/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
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* runs the bootloader processing routine until instructed to soft-exit.
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*/
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int main(void)
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{
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/* Setup hardware required for the bootloader */
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SetupHardware();
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/* Enable global interrupts so that the USB stack can function */
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GlobalInterruptEnable();
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while (RunBootloader)
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USB_USBTask();
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/* Wait a short time to end all USB transactions and then disconnect */
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_delay_us(1000);
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/* Disconnect from the host - USB interface will be reset later along with the AVR */
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USB_Detach();
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/* Unlock the forced application start mode of the bootloader if it is restarted */
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MagicBootKey = MAGIC_BOOT_KEY;
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/* Enable the watchdog and force a timeout to reset the AVR */
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wdt_enable(WDTO_250MS);
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for (;;);
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}
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/** Configures all hardware required for the bootloader. */
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static void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Relocate the interrupt vector table to the bootloader section */
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MCUCR = (1 << IVCE);
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MCUCR = (1 << IVSEL);
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/* Initialize USB subsystem */
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USB_Init();
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}
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/** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready
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* to relay data to and from the attached USB host.
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*/
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void EVENT_USB_Device_ConfigurationChanged(void)
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{
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/* Setup HID Report Endpoint */
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Endpoint_ConfigureEndpoint(HID_IN_EPADDR, EP_TYPE_INTERRUPT, HID_IN_EPSIZE, 1);
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}
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/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
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* the device from the USB host before passing along unhandled control requests to the library for processing
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* internally.
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*/
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void EVENT_USB_Device_ControlRequest(void)
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{
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/* Ignore any requests that aren't directed to the HID interface */
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if ((USB_ControlRequest.bmRequestType & (CONTROL_REQTYPE_TYPE | CONTROL_REQTYPE_RECIPIENT)) !=
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(REQTYPE_CLASS | REQREC_INTERFACE))
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{
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return;
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}
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/* Process HID specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case HID_REQ_SetReport:
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Endpoint_ClearSETUP();
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/* Wait until the command has been sent by the host */
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while (!(Endpoint_IsOUTReceived()));
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/* Read in the write destination address */
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#if (FLASHEND > 0xFFFF)
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uint32_t PageAddress = ((uint32_t)Endpoint_Read_16_LE() << 8);
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#else
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uint16_t PageAddress = Endpoint_Read_16_LE();
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#endif
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/* Determine if the given page address is correctly aligned to the
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start of a flash page. */
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bool PageAddressIsAligned = !(PageAddress & (SPM_PAGESIZE - 1));
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/* Check if the command is a program page command, or a start application command */
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#if (FLASHEND > 0xFFFF)
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if ((uint16_t)(PageAddress >> 8) == COMMAND_STARTAPPLICATION)
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#else
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if (PageAddress == COMMAND_STARTAPPLICATION)
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#endif
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{
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RunBootloader = false;
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}
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else if ((PageAddress < BOOT_START_ADDR) && PageAddressIsAligned)
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{
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/* Erase the given FLASH page, ready to be programmed */
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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boot_page_erase(PageAddress);
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boot_spm_busy_wait();
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}
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/* Write each of the FLASH page's bytes in sequence */
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for (uint8_t PageWord = 0; PageWord < (SPM_PAGESIZE / 2); PageWord++)
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{
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/* Check if endpoint is empty - if so clear it and wait until ready for next packet */
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if (!(Endpoint_BytesInEndpoint()))
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{
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Endpoint_ClearOUT();
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while (!(Endpoint_IsOUTReceived()));
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}
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/* Write the next data word to the FLASH page */
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boot_page_fill(PageAddress + ((uint16_t)PageWord << 1), Endpoint_Read_16_LE());
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}
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/* Write the filled FLASH page to memory */
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ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
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{
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boot_page_write(PageAddress);
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boot_spm_busy_wait();
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}
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/* Re-enable RWW section */
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boot_rww_enable();
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}
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Endpoint_ClearOUT();
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Endpoint_ClearStatusStage();
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break;
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}
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}
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