805 lines
25 KiB
C
805 lines
25 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2014.
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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 2014 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 DFU class bootloader. This file contains the complete bootloader logic.
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*/
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#define INCLUDE_FROM_BOOTLOADER_C
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#include "BootloaderDFU.h"
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/** Flag to indicate if the bootloader is currently running in secure mode, disallowing memory operations
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* other than erase. This is initially set to the value set by SECURE_MODE, and cleared by the bootloader
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* once a memory erase has completed in a bootloader session.
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*/
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static bool IsSecure = SECURE_MODE;
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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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* jumped to via an indirect jump to location 0x0000 (or other location specified by the host).
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*/
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static bool RunBootloader = true;
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/** Flag to indicate if the bootloader is waiting to exit. When the host requests the bootloader to exit and
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* jump to the application address it specifies, it sends two sequential commands which must be properly
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* acknowledged. Upon reception of the first the RunBootloader flag is cleared and the WaitForExit flag is set,
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* causing the bootloader to wait for the final exit command before shutting down.
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*/
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static bool WaitForExit = false;
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/** Current DFU state machine state, one of the values in the DFU_State_t enum. */
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static uint8_t DFU_State = dfuIDLE;
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/** Status code of the last executed DFU command. This is set to one of the values in the DFU_Status_t enum after
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* each operation, and returned to the host when a Get Status DFU request is issued.
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*/
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static uint8_t DFU_Status = OK;
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/** Data containing the DFU command sent from the host. */
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static DFU_Command_t SentCommand;
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/** Response to the last issued Read Data DFU command. Unlike other DFU commands, the read command
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* requires a single byte response from the bootloader containing the read data when the next DFU_UPLOAD command
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* is issued by the host.
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*/
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static uint8_t ResponseByte;
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/** Pointer to the start of the user application. By default this is 0x0000 (the reset vector), however the host
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* may specify an alternate address when issuing the application soft-start command.
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*/
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static AppPtr_t AppStartPtr = (AppPtr_t)0x0000;
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/** 64-bit flash page number. This is concatenated with the current 16-bit address on USB AVRs containing more than
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* 64KB of flash memory.
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*/
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static uint8_t Flash64KBPage = 0;
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/** Memory start address, indicating the current address in the memory being addressed (either FLASH or EEPROM
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* depending on the issued command from the host).
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*/
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static uint16_t StartAddr = 0x0000;
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/** Memory end address, indicating the end address to read from/write to in the memory being addressed (either FLASH
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* of EEPROM depending on the issued command from the host).
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*/
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static uint16_t EndAddr = 0x0000;
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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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bool JumpToApplication = false;
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#if ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
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/* Disable JTAG debugging */
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JTAG_DISABLE();
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/* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */
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PORTF |= (1 << 4);
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Delay_MS(10);
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/* If the TCK pin is not jumpered to ground, start the user application instead */
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JumpToApplication |= ((PINF & (1 << 4)) != 0);
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/* Re-enable JTAG debugging */
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JTAG_ENABLE();
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#endif
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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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JumpToApplication |= true;
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/* If a request has been made to jump to the user application, honor it */
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if (JumpToApplication)
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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, or hard-reset via the watchdog to start
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* the loaded application code.
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*/
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int main(void)
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{
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/* Configure hardware required by the bootloader */
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SetupHardware();
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/* Turn on first LED on the board to indicate that the bootloader has started */
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LEDs_SetAllLEDs(LEDS_LED1);
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/* Enable global interrupts so that the USB stack can function */
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GlobalInterruptEnable();
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/* Run the USB management task while the bootloader is supposed to be running */
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while (RunBootloader || WaitForExit)
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USB_USBTask();
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/* Reset configured hardware back to their original states for the user application */
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ResetHardware();
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/* Start the user application */
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AppStartPtr();
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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 the USB and other board hardware drivers */
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USB_Init();
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LEDs_Init();
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/* Bootloader active LED toggle timer initialization */
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TIMSK1 = (1 << TOIE1);
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TCCR1B = ((1 << CS11) | (1 << CS10));
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}
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/** Resets all configured hardware required for the bootloader back to their original states. */
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static void ResetHardware(void)
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{
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/* Shut down the USB and other board hardware drivers */
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USB_Disable();
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LEDs_Disable();
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/* Disable Bootloader active LED toggle timer */
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TIMSK1 = 0;
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TCCR1B = 0;
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/* Relocate the interrupt vector table back to the application section */
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MCUCR = (1 << IVCE);
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MCUCR = 0;
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}
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/** ISR to periodically toggle the LEDs on the board to indicate that the bootloader is active. */
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ISR(TIMER1_OVF_vect, ISR_BLOCK)
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{
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LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2);
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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 DFU 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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/* Activity - toggle indicator LEDs */
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LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2);
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/* Get the size of the command and data from the wLength value */
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SentCommand.DataSize = USB_ControlRequest.wLength;
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switch (USB_ControlRequest.bRequest)
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{
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case DFU_REQ_DNLOAD:
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Endpoint_ClearSETUP();
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/* Check if bootloader is waiting to terminate */
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if (WaitForExit)
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{
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/* Bootloader is terminating - process last received command */
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ProcessBootloaderCommand();
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/* Indicate that the last command has now been processed - free to exit bootloader */
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WaitForExit = false;
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}
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/* If the request has a data stage, load it into the command struct */
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if (SentCommand.DataSize)
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{
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while (!(Endpoint_IsOUTReceived()))
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{
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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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/* First byte of the data stage is the DNLOAD request's command */
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SentCommand.Command = Endpoint_Read_8();
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/* One byte of the data stage is the command, so subtract it from the total data bytes */
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SentCommand.DataSize--;
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/* Load in the rest of the data stage as command parameters */
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for (uint8_t DataByte = 0; (DataByte < sizeof(SentCommand.Data)) &&
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Endpoint_BytesInEndpoint(); DataByte++)
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{
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SentCommand.Data[DataByte] = Endpoint_Read_8();
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SentCommand.DataSize--;
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}
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/* Process the command */
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ProcessBootloaderCommand();
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}
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/* Check if currently downloading firmware */
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if (DFU_State == dfuDNLOAD_IDLE)
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{
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if (!(SentCommand.DataSize))
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{
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DFU_State = dfuIDLE;
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}
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else
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{
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/* Throw away the filler bytes before the start of the firmware */
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DiscardFillerBytes(DFU_FILLER_BYTES_SIZE);
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/* Throw away the packet alignment filler bytes before the start of the firmware */
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DiscardFillerBytes(StartAddr % FIXED_CONTROL_ENDPOINT_SIZE);
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/* Calculate the number of bytes remaining to be written */
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uint16_t BytesRemaining = ((EndAddr - StartAddr) + 1);
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if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00)) // Write flash
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{
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/* Calculate the number of words to be written from the number of bytes to be written */
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uint16_t WordsRemaining = (BytesRemaining >> 1);
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union
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{
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uint16_t Words[2];
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uint32_t Long;
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} CurrFlashAddress = {.Words = {StartAddr, Flash64KBPage}};
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uint32_t CurrFlashPageStartAddress = CurrFlashAddress.Long;
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uint8_t WordsInFlashPage = 0;
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while (WordsRemaining--)
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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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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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}
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/* Write the next word into the current flash page */
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boot_page_fill(CurrFlashAddress.Long, Endpoint_Read_16_LE());
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/* Adjust counters */
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WordsInFlashPage += 1;
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CurrFlashAddress.Long += 2;
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/* See if an entire page has been written to the flash page buffer */
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if ((WordsInFlashPage == (SPM_PAGESIZE >> 1)) || !(WordsRemaining))
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{
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/* Commit the flash page to memory */
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boot_page_write(CurrFlashPageStartAddress);
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boot_spm_busy_wait();
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/* Check if programming incomplete */
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if (WordsRemaining)
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{
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CurrFlashPageStartAddress = CurrFlashAddress.Long;
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WordsInFlashPage = 0;
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/* Erase next page's temp buffer */
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boot_page_erase(CurrFlashAddress.Long);
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boot_spm_busy_wait();
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}
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}
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}
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/* Once programming complete, start address equals the end address */
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StartAddr = EndAddr;
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/* Re-enable the RWW section of flash */
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boot_rww_enable();
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}
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else // Write EEPROM
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{
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while (BytesRemaining--)
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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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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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}
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/* Read the byte from the USB interface and write to to the EEPROM */
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eeprom_write_byte((uint8_t*)StartAddr, Endpoint_Read_8());
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/* Adjust counters */
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StartAddr++;
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}
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}
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/* Throw away the currently unused DFU file suffix */
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DiscardFillerBytes(DFU_FILE_SUFFIX_SIZE);
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}
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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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case DFU_REQ_UPLOAD:
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Endpoint_ClearSETUP();
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while (!(Endpoint_IsINReady()))
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{
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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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if (DFU_State != dfuUPLOAD_IDLE)
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{
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if ((DFU_State == dfuERROR) && IS_ONEBYTE_COMMAND(SentCommand.Data, 0x01)) // Blank Check
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{
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/* Blank checking is performed in the DFU_DNLOAD request - if we get here we've told the host
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that the memory isn't blank, and the host is requesting the first non-blank address */
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Endpoint_Write_16_LE(StartAddr);
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}
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else
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{
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/* Idle state upload - send response to last issued command */
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Endpoint_Write_8(ResponseByte);
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}
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}
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else
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{
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/* Determine the number of bytes remaining in the current block */
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uint16_t BytesRemaining = ((EndAddr - StartAddr) + 1);
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if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00)) // Read FLASH
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{
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/* Calculate the number of words to be written from the number of bytes to be written */
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uint16_t WordsRemaining = (BytesRemaining >> 1);
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union
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{
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uint16_t Words[2];
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uint32_t Long;
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} CurrFlashAddress = {.Words = {StartAddr, Flash64KBPage}};
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while (WordsRemaining--)
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{
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/* Check if endpoint is full - if so clear it and wait until ready for next packet */
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if (Endpoint_BytesInEndpoint() == FIXED_CONTROL_ENDPOINT_SIZE)
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{
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Endpoint_ClearIN();
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while (!(Endpoint_IsINReady()))
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{
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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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}
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/* Read the flash word and send it via USB to the host */
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#if (FLASHEND > 0xFFFF)
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Endpoint_Write_16_LE(pgm_read_word_far(CurrFlashAddress.Long));
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#else
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Endpoint_Write_16_LE(pgm_read_word(CurrFlashAddress.Long));
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#endif
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/* Adjust counters */
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CurrFlashAddress.Long += 2;
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}
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/* Once reading is complete, start address equals the end address */
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StartAddr = EndAddr;
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}
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else if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x02)) // Read EEPROM
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{
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while (BytesRemaining--)
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{
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/* Check if endpoint is full - if so clear it and wait until ready for next packet */
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if (Endpoint_BytesInEndpoint() == FIXED_CONTROL_ENDPOINT_SIZE)
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{
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Endpoint_ClearIN();
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while (!(Endpoint_IsINReady()))
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{
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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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}
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/* Read the EEPROM byte and send it via USB to the host */
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Endpoint_Write_8(eeprom_read_byte((uint8_t*)StartAddr));
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/* Adjust counters */
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StartAddr++;
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}
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}
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/* Return to idle state */
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DFU_State = dfuIDLE;
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}
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Endpoint_ClearIN();
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Endpoint_ClearStatusStage();
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break;
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case DFU_REQ_GETSTATUS:
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Endpoint_ClearSETUP();
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while (!(Endpoint_IsINReady()))
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{
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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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/* Write 8-bit status value */
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Endpoint_Write_8(DFU_Status);
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/* Write 24-bit poll timeout value */
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Endpoint_Write_8(0);
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Endpoint_Write_16_LE(0);
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/* Write 8-bit state value */
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Endpoint_Write_8(DFU_State);
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/* Write 8-bit state string ID number */
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Endpoint_Write_8(0);
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Endpoint_ClearIN();
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Endpoint_ClearStatusStage();
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break;
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case DFU_REQ_CLRSTATUS:
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Endpoint_ClearSETUP();
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/* Reset the status value variable to the default OK status */
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DFU_Status = OK;
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Endpoint_ClearStatusStage();
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break;
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case DFU_REQ_GETSTATE:
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Endpoint_ClearSETUP();
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while (!(Endpoint_IsINReady()))
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{
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if (USB_DeviceState == DEVICE_STATE_Unattached)
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return;
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}
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/* Write the current device state to the endpoint */
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Endpoint_Write_8(DFU_State);
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Endpoint_ClearIN();
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Endpoint_ClearStatusStage();
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break;
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case DFU_REQ_ABORT:
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Endpoint_ClearSETUP();
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/* Reset the current state variable to the default idle state */
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DFU_State = dfuIDLE;
|
|
|
|
Endpoint_ClearStatusStage();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/** Routine to discard the specified number of bytes from the control endpoint stream. This is used to
|
|
* discard unused bytes in the stream from the host, including the memory program block suffix.
|
|
*
|
|
* \param[in] NumberOfBytes Number of bytes to discard from the host from the control endpoint
|
|
*/
|
|
static void DiscardFillerBytes(uint8_t NumberOfBytes)
|
|
{
|
|
while (NumberOfBytes--)
|
|
{
|
|
if (!(Endpoint_BytesInEndpoint()))
|
|
{
|
|
Endpoint_ClearOUT();
|
|
|
|
/* Wait until next data packet received */
|
|
while (!(Endpoint_IsOUTReceived()))
|
|
{
|
|
if (USB_DeviceState == DEVICE_STATE_Unattached)
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Endpoint_Discard_8();
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Routine to process an issued command from the host, via a DFU_DNLOAD request wrapper. This routine ensures
|
|
* that the command is allowed based on the current secure mode flag value, and passes the command off to the
|
|
* appropriate handler function.
|
|
*/
|
|
static void ProcessBootloaderCommand(void)
|
|
{
|
|
/* Check if device is in secure mode */
|
|
if (IsSecure)
|
|
{
|
|
/* Don't process command unless it is a READ or chip erase command */
|
|
if (!(((SentCommand.Command == COMMAND_WRITE) &&
|
|
IS_TWOBYTE_COMMAND(SentCommand.Data, 0x00, 0xFF)) ||
|
|
(SentCommand.Command == COMMAND_READ)))
|
|
{
|
|
/* Set the state and status variables to indicate the error */
|
|
DFU_State = dfuERROR;
|
|
DFU_Status = errWRITE;
|
|
|
|
/* Stall command */
|
|
Endpoint_StallTransaction();
|
|
|
|
/* Don't process the command */
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Dispatch the required command processing routine based on the command type */
|
|
switch (SentCommand.Command)
|
|
{
|
|
case COMMAND_PROG_START:
|
|
ProcessMemProgCommand();
|
|
break;
|
|
case COMMAND_DISP_DATA:
|
|
ProcessMemReadCommand();
|
|
break;
|
|
case COMMAND_WRITE:
|
|
ProcessWriteCommand();
|
|
break;
|
|
case COMMAND_READ:
|
|
ProcessReadCommand();
|
|
break;
|
|
case COMMAND_CHANGE_BASE_ADDR:
|
|
if (IS_TWOBYTE_COMMAND(SentCommand.Data, 0x03, 0x00)) // Set 64KB flash page command
|
|
Flash64KBPage = SentCommand.Data[2];
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
/** Routine to concatenate the given pair of 16-bit memory start and end addresses from the host, and store them
|
|
* in the StartAddr and EndAddr global variables.
|
|
*/
|
|
static void LoadStartEndAddresses(void)
|
|
{
|
|
union
|
|
{
|
|
uint8_t Bytes[2];
|
|
uint16_t Word;
|
|
} Address[2] = {{.Bytes = {SentCommand.Data[2], SentCommand.Data[1]}},
|
|
{.Bytes = {SentCommand.Data[4], SentCommand.Data[3]}}};
|
|
|
|
/* Load in the start and ending read addresses from the sent data packet */
|
|
StartAddr = Address[0].Word;
|
|
EndAddr = Address[1].Word;
|
|
}
|
|
|
|
/** Handler for a Memory Program command issued by the host. This routine handles the preparations needed
|
|
* to write subsequent data from the host into the specified memory.
|
|
*/
|
|
static void ProcessMemProgCommand(void)
|
|
{
|
|
if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00) || // Write FLASH command
|
|
IS_ONEBYTE_COMMAND(SentCommand.Data, 0x01)) // Write EEPROM command
|
|
{
|
|
/* Load in the start and ending read addresses */
|
|
LoadStartEndAddresses();
|
|
|
|
/* If FLASH is being written to, we need to pre-erase the first page to write to */
|
|
if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00))
|
|
{
|
|
union
|
|
{
|
|
uint16_t Words[2];
|
|
uint32_t Long;
|
|
} CurrFlashAddress = {.Words = {StartAddr, Flash64KBPage}};
|
|
|
|
/* Erase the current page's temp buffer */
|
|
boot_page_erase(CurrFlashAddress.Long);
|
|
boot_spm_busy_wait();
|
|
}
|
|
|
|
/* Set the state so that the next DNLOAD requests reads in the firmware */
|
|
DFU_State = dfuDNLOAD_IDLE;
|
|
}
|
|
}
|
|
|
|
/** Handler for a Memory Read command issued by the host. This routine handles the preparations needed
|
|
* to read subsequent data from the specified memory out to the host, as well as implementing the memory
|
|
* blank check command.
|
|
*/
|
|
static void ProcessMemReadCommand(void)
|
|
{
|
|
if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00) || // Read FLASH command
|
|
IS_ONEBYTE_COMMAND(SentCommand.Data, 0x02)) // Read EEPROM command
|
|
{
|
|
/* Load in the start and ending read addresses */
|
|
LoadStartEndAddresses();
|
|
|
|
/* Set the state so that the next UPLOAD requests read out the firmware */
|
|
DFU_State = dfuUPLOAD_IDLE;
|
|
}
|
|
else if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x01)) // Blank check FLASH command
|
|
{
|
|
uint32_t CurrFlashAddress = 0;
|
|
|
|
while (CurrFlashAddress < (uint32_t)BOOT_START_ADDR)
|
|
{
|
|
/* Check if the current byte is not blank */
|
|
#if (FLASHEND > 0xFFFF)
|
|
if (pgm_read_byte_far(CurrFlashAddress) != 0xFF)
|
|
#else
|
|
if (pgm_read_byte(CurrFlashAddress) != 0xFF)
|
|
#endif
|
|
{
|
|
/* Save the location of the first non-blank byte for response back to the host */
|
|
Flash64KBPage = (CurrFlashAddress >> 16);
|
|
StartAddr = CurrFlashAddress;
|
|
|
|
/* Set state and status variables to the appropriate error values */
|
|
DFU_State = dfuERROR;
|
|
DFU_Status = errCHECK_ERASED;
|
|
|
|
break;
|
|
}
|
|
|
|
CurrFlashAddress++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Handler for a Data Write command issued by the host. This routine handles non-programming commands such as
|
|
* bootloader exit (both via software jumps and hardware watchdog resets) and flash memory erasure.
|
|
*/
|
|
static void ProcessWriteCommand(void)
|
|
{
|
|
if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x03)) // Start application
|
|
{
|
|
/* Indicate that the bootloader is terminating */
|
|
WaitForExit = true;
|
|
|
|
/* Check if data supplied for the Start Program command - no data executes the program */
|
|
if (SentCommand.DataSize)
|
|
{
|
|
if (SentCommand.Data[1] == 0x01) // Start via jump
|
|
{
|
|
union
|
|
{
|
|
uint8_t Bytes[2];
|
|
AppPtr_t FuncPtr;
|
|
} Address = {.Bytes = {SentCommand.Data[4], SentCommand.Data[3]}};
|
|
|
|
/* Load in the jump address into the application start address pointer */
|
|
AppStartPtr = Address.FuncPtr;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (SentCommand.Data[1] == 0x00) // Start via watchdog
|
|
{
|
|
/* Unlock the forced application start mode of the bootloader if it is restarted */
|
|
MagicBootKey = MAGIC_BOOT_KEY;
|
|
|
|
/* Start the watchdog to reset the AVR once the communications are finalized */
|
|
wdt_enable(WDTO_250MS);
|
|
}
|
|
else // Start via jump
|
|
{
|
|
/* Set the flag to terminate the bootloader at next opportunity */
|
|
RunBootloader = false;
|
|
}
|
|
}
|
|
}
|
|
else if (IS_TWOBYTE_COMMAND(SentCommand.Data, 0x00, 0xFF)) // Erase flash
|
|
{
|
|
uint32_t CurrFlashAddress = 0;
|
|
|
|
/* Clear the application section of flash */
|
|
while (CurrFlashAddress < (uint32_t)BOOT_START_ADDR)
|
|
{
|
|
boot_page_erase(CurrFlashAddress);
|
|
boot_spm_busy_wait();
|
|
boot_page_write(CurrFlashAddress);
|
|
boot_spm_busy_wait();
|
|
|
|
CurrFlashAddress += SPM_PAGESIZE;
|
|
}
|
|
|
|
/* Re-enable the RWW section of flash as writing to the flash locks it out */
|
|
boot_rww_enable();
|
|
|
|
/* Memory has been erased, reset the security bit so that programming/reading is allowed */
|
|
IsSecure = false;
|
|
}
|
|
}
|
|
|
|
/** Handler for a Data Read command issued by the host. This routine handles bootloader information retrieval
|
|
* commands such as device signature and bootloader version retrieval.
|
|
*/
|
|
static void ProcessReadCommand(void)
|
|
{
|
|
const uint8_t BootloaderInfo[3] = {BOOTLOADER_VERSION, BOOTLOADER_ID_BYTE1, BOOTLOADER_ID_BYTE2};
|
|
const uint8_t SignatureInfo[4] = {0x58, AVR_SIGNATURE_1, AVR_SIGNATURE_2, AVR_SIGNATURE_3};
|
|
|
|
uint8_t DataIndexToRead = SentCommand.Data[1];
|
|
|
|
if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x00)) // Read bootloader info
|
|
{
|
|
ResponseByte = BootloaderInfo[DataIndexToRead];
|
|
}
|
|
else if (IS_ONEBYTE_COMMAND(SentCommand.Data, 0x01)) // Read signature byte
|
|
{
|
|
if (DataIndexToRead < 0x60)
|
|
ResponseByte = SignatureInfo[DataIndexToRead - 0x30];
|
|
else
|
|
ResponseByte = SignatureInfo[DataIndexToRead - 0x60 + 3];
|
|
}
|
|
}
|
|
|