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551 lines
16 KiB
551 lines
16 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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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 2010 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 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 CDC class bootloader. This file contains the complete bootloader logic.
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*/
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#define INCLUDE_FROM_BOOTLOADERCDC_C
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#include "BootloaderCDC.h"
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/** Contains the current baud rate and other settings of the first virtual serial port. This must be retained as some
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* operating systems will not open the port unless the settings can be set successfully.
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*/
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CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0,
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.CharFormat = OneStopBit,
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.ParityType = Parity_None,
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.DataBits = 8 };
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/** Current address counter. This stores the current address of the FLASH or EEPROM as set by the host,
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* and is used when reading or writing to the AVRs memory (either FLASH or EEPROM depending on the issued
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* command.)
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*/
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uint32_t CurrAddress;
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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 watchdog reset. When cleared the bootloader will exit, starting the watchdog and entering an infinite
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* loop until the AVR restarts and the application runs.
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*/
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bool RunBootloader = true;
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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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/* 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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sei();
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while (RunBootloader)
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{
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CDC_Task();
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USB_USBTask();
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}
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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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/* 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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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 CDC Notification, Rx and Tx Endpoints */
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Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
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ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
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ENDPOINT_BANK_SINGLE);
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Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
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ENDPOINT_BANK_SINGLE);
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Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
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ENDPOINT_BANK_SINGLE);
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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 CDC control commands,
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* which are 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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/* Process CDC specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case REQ_GetLineEncoding:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Write the line coding data to the control endpoint */
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Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
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Endpoint_ClearOUT();
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}
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break;
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case REQ_SetLineEncoding:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Read the line coding data in from the host into the global struct */
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Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_Line_Coding_t));
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Endpoint_ClearIN();
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}
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break;
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}
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}
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/** Reads or writes a block of EEPROM or FLASH memory to or from the appropriate CDC data endpoint, depending
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* on the AVR910 protocol command issued.
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*
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* \param[in] Command Single character AVR910 protocol command indicating what memory operation to perform
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*/
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static void ReadWriteMemoryBlock(const uint8_t Command)
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{
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uint16_t BlockSize;
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char MemoryType;
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bool HighByte = false;
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uint8_t LowByte = 0;
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BlockSize = (FetchNextCommandByte() << 8);
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BlockSize |= FetchNextCommandByte();
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MemoryType = FetchNextCommandByte();
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if ((MemoryType != 'E') && (MemoryType != 'F'))
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{
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/* Send error byte back to the host */
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WriteNextResponseByte('?');
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return;
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}
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/* Check if command is to read memory */
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if (Command == 'g')
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{
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/* Re-enable RWW section */
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boot_rww_enable();
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while (BlockSize--)
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{
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if (MemoryType == 'F')
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{
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/* Read the next FLASH byte from the current FLASH page */
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#if (FLASHEND > 0xFFFF)
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WriteNextResponseByte(pgm_read_byte_far(CurrAddress | HighByte));
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#else
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WriteNextResponseByte(pgm_read_byte(CurrAddress | HighByte));
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#endif
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/* If both bytes in current word have been read, increment the address counter */
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if (HighByte)
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CurrAddress += 2;
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HighByte = !HighByte;
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}
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else
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{
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/* Read the next EEPROM byte into the endpoint */
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WriteNextResponseByte(eeprom_read_byte((uint8_t*)(intptr_t)(CurrAddress >> 1)));
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/* Increment the address counter after use */
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CurrAddress += 2;
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}
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}
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}
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else
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{
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uint32_t PageStartAddress = CurrAddress;
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if (MemoryType == 'F')
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{
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boot_page_erase(PageStartAddress);
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boot_spm_busy_wait();
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}
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while (BlockSize--)
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{
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if (MemoryType == 'F')
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{
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/* If both bytes in current word have been written, increment the address counter */
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if (HighByte)
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{
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/* Write the next FLASH word to the current FLASH page */
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boot_page_fill(CurrAddress, ((FetchNextCommandByte() << 8) | LowByte));
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/* Increment the address counter after use */
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CurrAddress += 2;
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HighByte = false;
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}
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else
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{
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LowByte = FetchNextCommandByte();
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HighByte = true;
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}
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}
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else
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{
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/* Write the next EEPROM byte from the endpoint */
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eeprom_write_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte());
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/* Increment the address counter after use */
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CurrAddress += 2;
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}
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}
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/* If in FLASH programming mode, commit the page after writing */
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if (MemoryType == 'F')
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{
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/* Commit the flash page to memory */
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boot_page_write(PageStartAddress);
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/* Wait until write operation has completed */
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boot_spm_busy_wait();
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}
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/* Send response byte back to the host */
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WriteNextResponseByte('\r');
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}
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}
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/** Retrieves the next byte from the host in the CDC data OUT endpoint, and clears the endpoint bank if needed
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* to allow reception of the next data packet from the host.
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*
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* \return Next received byte from the host in the CDC data OUT endpoint
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*/
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static uint8_t FetchNextCommandByte(void)
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{
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/* Select the OUT endpoint so that the next data byte can be read */
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Endpoint_SelectEndpoint(CDC_RX_EPNUM);
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/* If OUT endpoint empty, clear it and wait for the next packet from the host */
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while (!(Endpoint_IsReadWriteAllowed()))
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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 0;
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}
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}
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/* Fetch the next byte from the OUT endpoint */
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return Endpoint_Read_Byte();
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}
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/** Writes the next response byte to the CDC data IN endpoint, and sends the endpoint back if needed to free up the
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* bank when full ready for the next byte in the packet to the host.
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*
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* \param[in] Response Next response byte to send to the host
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*/
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static void WriteNextResponseByte(const uint8_t Response)
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{
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/* Select the IN endpoint so that the next data byte can be written */
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Endpoint_SelectEndpoint(CDC_TX_EPNUM);
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/* If IN endpoint full, clear it and wait until ready for the next packet to the host */
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if (!(Endpoint_IsReadWriteAllowed()))
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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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/* Write the next byte to the OUT endpoint */
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Endpoint_Write_Byte(Response);
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}
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/** Task to read in AVR910 commands from the CDC data OUT endpoint, process them, perform the required actions
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* and send the appropriate response back to the host.
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*/
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void CDC_Task(void)
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{
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/* Select the OUT endpoint */
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Endpoint_SelectEndpoint(CDC_RX_EPNUM);
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/* Check if endpoint has a command in it sent from the host */
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if (Endpoint_IsOUTReceived())
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{
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/* Read in the bootloader command (first byte sent from host) */
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uint8_t Command = FetchNextCommandByte();
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if ((Command == 'L') || (Command == 'P') || (Command == 'T') || (Command == 'E'))
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{
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if (Command == 'E')
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RunBootloader = false;
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else if (Command == 'T')
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FetchNextCommandByte();
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 't')
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{
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/* Return ATMEGA128 part code - this is only to allow AVRProg to use the bootloader */
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WriteNextResponseByte(0x44);
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WriteNextResponseByte(0x00);
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}
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else if (Command == 'a')
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{
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/* Indicate auto-address increment is supported */
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WriteNextResponseByte('Y');
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}
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else if (Command == 'A')
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{
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/* Set the current address to that given by the host */
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CurrAddress = (FetchNextCommandByte() << 9);
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CurrAddress |= (FetchNextCommandByte() << 1);
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 'p')
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{
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/* Indicate serial programmer back to the host */
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WriteNextResponseByte('S');
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}
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else if (Command == 'S')
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{
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/* Write the 7-byte software identifier to the endpoint */
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for (uint8_t CurrByte = 0; CurrByte < 7; CurrByte++)
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WriteNextResponseByte(SOFTWARE_IDENTIFIER[CurrByte]);
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}
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else if (Command == 'V')
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{
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WriteNextResponseByte('0' + BOOTLOADER_VERSION_MAJOR);
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WriteNextResponseByte('0' + BOOTLOADER_VERSION_MINOR);
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}
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else if (Command == 's')
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{
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WriteNextResponseByte(AVR_SIGNATURE_3);
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WriteNextResponseByte(AVR_SIGNATURE_2);
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WriteNextResponseByte(AVR_SIGNATURE_1);
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}
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else if (Command == 'b')
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{
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WriteNextResponseByte('Y');
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/* Send block size to the host */
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WriteNextResponseByte(SPM_PAGESIZE >> 8);
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WriteNextResponseByte(SPM_PAGESIZE & 0xFF);
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}
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else if (Command == 'e')
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{
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/* Clear the application section of flash */
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for (uint32_t CurrFlashAddress = 0; CurrFlashAddress < BOOT_START_ADDR; CurrFlashAddress++)
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{
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boot_page_erase(CurrFlashAddress);
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boot_spm_busy_wait();
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boot_page_write(CurrFlashAddress);
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boot_spm_busy_wait();
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CurrFlashAddress += SPM_PAGESIZE;
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}
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 'l')
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{
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/* Set the lock bits to those given by the host */
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boot_lock_bits_set(FetchNextCommandByte());
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 'r')
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{
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WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOCK_BITS));
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}
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else if (Command == 'F')
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{
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WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS));
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}
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else if (Command == 'N')
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{
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WriteNextResponseByte(boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS));
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}
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else if (Command == 'Q')
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{
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WriteNextResponseByte(boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS));
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}
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else if (Command == 'C')
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{
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/* Write the high byte to the current flash page */
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boot_page_fill(CurrAddress, FetchNextCommandByte());
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 'c')
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{
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/* Write the low byte to the current flash page */
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boot_page_fill(CurrAddress | 1, FetchNextCommandByte());
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/* Increment the address */
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CurrAddress += 2;
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 'm')
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{
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/* Commit the flash page to memory */
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boot_page_write(CurrAddress);
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/* Wait until write operation has completed */
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boot_spm_busy_wait();
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if ((Command == 'B') || (Command == 'g'))
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{
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/* Delegate the block write/read to a separate function for clarity */
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ReadWriteMemoryBlock(Command);
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}
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else if (Command == 'R')
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{
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#if (FLASHEND > 0xFFFF)
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uint16_t ProgramWord = pgm_read_word_far(CurrAddress);
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#else
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uint16_t ProgramWord = pgm_read_word(CurrAddress);
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#endif
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WriteNextResponseByte(ProgramWord >> 8);
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WriteNextResponseByte(ProgramWord & 0xFF);
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}
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else if (Command == 'D')
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{
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/* Read the byte from the endpoint and write it to the EEPROM */
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eeprom_write_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte());
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/* Increment the address after use */
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CurrAddress += 2;
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/* Send confirmation byte back to the host */
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WriteNextResponseByte('\r');
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}
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else if (Command == 'd')
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{
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/* Read the EEPROM byte and write it to the endpoint */
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WriteNextResponseByte(eeprom_read_byte((uint8_t*)((intptr_t)(CurrAddress >> 1))));
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/* Increment the address after use */
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CurrAddress += 2;
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}
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else if (Command == 27)
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{
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/* Escape is sync, ignore */
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}
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else
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{
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/* Unknown command, return fail code */
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WriteNextResponseByte('?');
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}
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/* Select the IN endpoint */
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Endpoint_SelectEndpoint(CDC_TX_EPNUM);
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/* Remember if the endpoint is completely full before clearing it */
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bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
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/* Send the endpoint data to the host */
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Endpoint_ClearIN();
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/* If a full endpoint's worth of data was sent, we need to send an empty packet afterwards to signal end of transfer */
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if (IsEndpointFull)
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{
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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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Endpoint_ClearIN();
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}
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/* Wait until the data has been sent to the host */
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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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/* Select the OUT endpoint */
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Endpoint_SelectEndpoint(CDC_RX_EPNUM);
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/* Acknowledge the command from the host */
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Endpoint_ClearOUT();
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}
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}
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