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701 lines
22 KiB
701 lines
22 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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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 disclaim 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.
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*/
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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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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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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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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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uint8_t DFU_Status = OK;
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/** Data containing the DFU command sent from the host. */
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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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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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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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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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uint16_t StartAddr = 0x0000;
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/** Memory end address, indicating the end address to read to/write from 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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uint16_t EndAddr = 0x0000;
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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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/* 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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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 subsystem */
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USB_Init();
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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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void ResetHardware(void)
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{
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/* Shut down the USB subsystem */
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USB_ShutDown();
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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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/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
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* control requests that are not handled internally by the USB library (including the DFU commands, which are
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* all issued via the control endpoint), so that they can be handled appropriately for the application.
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*/
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void EVENT_USB_Device_UnhandledControlRequest(void)
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{
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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_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_Byte();
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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_Byte();
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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 page alignment filler bytes before the start of the firmware */
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DiscardFillerBytes(StartAddr % SPM_PAGESIZE);
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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_Word_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_Byte());
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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_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_Word_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_Byte(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_Word_LE(pgm_read_word_far(CurrFlashAddress.Long));
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#else
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Endpoint_Write_Word_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_Byte(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_GETSTATUS:
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Endpoint_ClearSETUP();
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/* Write 8-bit status value */
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Endpoint_Write_Byte(DFU_Status);
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/* Write 24-bit poll timeout value */
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Endpoint_Write_Byte(0);
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Endpoint_Write_Word_LE(0);
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/* Write 8-bit state value */
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Endpoint_Write_Byte(DFU_State);
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/* Write 8-bit state string ID number */
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Endpoint_Write_Byte(0);
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Endpoint_ClearIN();
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Endpoint_ClearStatusStage();
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break;
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case DFU_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_GETSTATE:
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Endpoint_ClearSETUP();
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/* Write the current device state to the endpoint */
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Endpoint_Write_Byte(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_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;
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Endpoint_ClearStatusStage();
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break;
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}
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}
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/** Routine to discard the specified number of bytes from the control endpoint stream. This is used to
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* discard unused bytes in the stream from the host, including the memory program block suffix.
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*
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* \param[in] NumberOfBytes Number of bytes to discard from the host from the control endpoint
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*/
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static void DiscardFillerBytes(uint8_t NumberOfBytes)
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{
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while (NumberOfBytes--)
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{
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if (!(Endpoint_BytesInEndpoint()))
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{
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Endpoint_ClearOUT();
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/* Wait until next data packet received */
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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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else
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{
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Endpoint_Discard_Byte();
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}
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}
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}
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/** Routine to process an issued command from the host, via a DFU_DNLOAD request wrapper. This routine ensures
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* that the command is allowed based on the current secure mode flag value, and passes the command off to the
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* appropriate handler function.
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*/
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static void ProcessBootloaderCommand(void)
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{
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/* Check if device is in secure mode */
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if (IsSecure)
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{
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/* Don't process command unless it is a READ or chip erase command */
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if (!(((SentCommand.Command == COMMAND_WRITE) &&
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IS_TWOBYTE_COMMAND(SentCommand.Data, 0x00, 0xFF)) ||
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(SentCommand.Command == COMMAND_READ)))
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{
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/* Set the state and status variables to indicate the error */
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DFU_State = dfuERROR;
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DFU_Status = errWRITE;
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/* Stall command */
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Endpoint_StallTransaction();
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/* Don't process the command */
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return;
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}
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}
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/* Dispatch the required command processing routine based on the command type */
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switch (SentCommand.Command)
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{
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case COMMAND_PROG_START:
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ProcessMemProgCommand();
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break;
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case COMMAND_DISP_DATA:
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ProcessMemReadCommand();
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break;
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case COMMAND_WRITE:
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ProcessWriteCommand();
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break;
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case COMMAND_READ:
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ProcessReadCommand();
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break;
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case COMMAND_CHANGE_BASE_ADDR:
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if (IS_TWOBYTE_COMMAND(SentCommand.Data, 0x03, 0x00)) // Set 64KB flash page command
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Flash64KBPage = SentCommand.Data[2];
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break;
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}
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}
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/** Routine to concatenate the given pair of 16-bit memory start and end addresses from the host, and store them
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* in the StartAddr and EndAddr global variables.
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*/
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static void LoadStartEndAddresses(void)
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{
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union
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{
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uint8_t Bytes[2];
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uint16_t Word;
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} Address[2] = {{.Bytes = {SentCommand.Data[2], SentCommand.Data[1]}},
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{.Bytes = {SentCommand.Data[4], SentCommand.Data[3]}}};
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/* Load in the start and ending read addresses from the sent data packet */
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StartAddr = Address[0].Word;
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EndAddr = Address[1].Word;
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}
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/** Handler for a Memory Program command issued by the host. This routine handles the preparations needed
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* to write subsequent data from the host into the specified memory.
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*/
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static void ProcessMemProgCommand(void)
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{
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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 < 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 empty request data array - an empty request after a filled request retains the
|
|
previous valid request data, but initializes the reset */
|
|
if (!(SentCommand.DataSize))
|
|
{
|
|
if (SentCommand.Data[1] == 0x00) // Start via watchdog
|
|
{
|
|
/* Start the watchdog to reset the AVR once the communications are finalized */
|
|
wdt_enable(WDTO_250MS);
|
|
}
|
|
else // Start via jump
|
|
{
|
|
/* Load in the jump address into the application start address pointer */
|
|
union
|
|
{
|
|
uint8_t Bytes[2];
|
|
AppPtr_t FuncPtr;
|
|
} Address = {.Bytes = {SentCommand.Data[4], SentCommand.Data[3]}};
|
|
|
|
AppStartPtr = Address.FuncPtr;
|
|
|
|
/* 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 < 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[3] = {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
|
|
{
|
|
ResponseByte = SignatureInfo[DataIndexToRead - 0x30];
|
|
}
|
|
}
|