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680 lines
20 KiB
680 lines
20 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2011.
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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 2011 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_CATERINA_C
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#include "Caterina.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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static CDC_LineEncoding_t LineEncoding = { .BaudRateBPS = 0,
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.CharFormat = CDC_LINEENCODING_OneStopBit,
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.ParityType = CDC_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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static 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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static bool RunBootloader = true;
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/* Bootloader timeout timer */
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#define TIMEOUT_PERIOD 2000
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uint16_t Timeout = 0;
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uint16_t bootKey = 0x7777;
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volatile uint16_t *const bootKeyPtr = (volatile uint16_t *)0x0800;
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void StartSketch(void)
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{
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cli();
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/* Undo TIMER1 setup and clear the count before running the sketch */
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TIMSK1 = 0;
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TCCR1B = 0;
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TCNT1H = 0; // 16-bit write to TCNT1 requires high byte be written first
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TCNT1L = 0;
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/* Relocate the interrupt vector table to the application section */
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MCUCR = (1 << IVCE);
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MCUCR = 0;
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/* jump to beginning of application space */
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__asm__ volatile("jmp 0x0000");
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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 it times out or is instructed to exit.
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*/
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int main(void)
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{
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/* Save the value of the boot key memory before it is overwritten */
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uint16_t bootKeyPtrVal = *bootKeyPtr;
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*bootKeyPtr = 0;
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/* Check the reason for the reset so we can act accordingly */
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uint8_t mcusr_state = MCUSR; // store the initial state of the Status register
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MCUSR = 0; // clear all reset flags
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/* Watchdog may be configured with a 15 ms period so must disable it before going any further */
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wdt_disable();
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if (mcusr_state & (1<<EXTRF)) {
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// External reset - we should continue to self-programming mode.
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} else if ((mcusr_state & (1<<PORF)) && (pgm_read_word(0) != 0xFFFF)) {
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// After a power-on reset skip the bootloader and jump straight to sketch
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// if one exists.
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StartSketch();
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} else if ((mcusr_state & (1<<WDRF)) && (bootKeyPtrVal != bootKey) && (pgm_read_word(0) != 0xFFFF)) {
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// If it looks like an "accidental" watchdog reset then start the sketch.
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// StartSketch();
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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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Timeout = 0;
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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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/* Time out and start the sketch if one is present */
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if (Timeout > TIMEOUT_PERIOD)
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RunBootloader = false;
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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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/* Jump to beginning of application space to run the sketch - do not reset */
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StartSketch();
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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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CPU_PRESCALE(0);
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/* Initialize TIMER1 to handle bootloader timeout and LED tasks.
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* With 16 MHz clock and 1/64 prescaler, timer 1 is clocked at 250 kHz
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* Our chosen compare match generates an interrupt every 1 ms.
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* This interrupt is disabled selectively when doing memory reading, erasing,
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* or writing since SPM has tight timing requirements.
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*/
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OCR1AH = 0;
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OCR1AL = 250;
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TIMSK1 = (1 << OCIE1A); // enable timer 1 output compare A match interrupt
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TCCR1B = ((1 << CS11) | (1 << CS10)); // 1/64 prescaler on timer 1 input
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/* Initialize USB Subsystem */
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USB_Init();
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}
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//uint16_t ctr = 0;
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ISR(TIMER1_COMPA_vect, ISR_BLOCK)
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{
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/* Reset counter */
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TCNT1H = 0;
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TCNT1L = 0;
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if (pgm_read_word(0) != 0xFFFF)
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Timeout++;
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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_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 CDC interface */
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if ((USB_ControlRequest.bmRequestType & (CONTROL_REQTYPE_TYPE | CONTROL_REQTYPE_RECIPIENT)) !=
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(REQTYPE_CLASS | REQREC_INTERFACE))
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{
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return;
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}
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/* Process CDC specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case CDC_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_LineEncoding_t));
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Endpoint_ClearOUT();
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}
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break;
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case CDC_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_LineEncoding_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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#if !defined(NO_BLOCK_SUPPORT)
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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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/* Disable timer 1 interrupt - can't afford to process nonessential interrupts
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* while doing SPM tasks */
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TIMSK1 = 0;
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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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}
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else
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{
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LowByte = FetchNextCommandByte();
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}
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HighByte = !HighByte;
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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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/* Re-enable timer 1 interrupt disabled earlier in this routine */
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TIMSK1 = (1 << OCIE1A);
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}
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#endif
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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_8();
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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 IN endpoint */
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Endpoint_Write_8(Response);
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}
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#define STK_OK 0x10
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#define STK_INSYNC 0x14 // ' '
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#define CRC_EOP 0x20 // 'SPACE'
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#define STK_GET_SYNC 0x30 // '0'
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#define STK_GET_PARAMETER 0x41 // 'A'
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#define STK_SET_DEVICE 0x42 // 'B'
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#define STK_SET_DEVICE_EXT 0x45 // 'E'
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#define STK_LOAD_ADDRESS 0x55 // 'U'
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#define STK_UNIVERSAL 0x56 // 'V'
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#define STK_PROG_PAGE 0x64 // 'd'
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#define STK_READ_PAGE 0x74 // 't'
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#define STK_READ_SIGN 0x75 // 'u'
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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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return;
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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 == 'E')
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{
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/* We nearly run out the bootloader timeout clock,
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* leaving just a few hundred milliseconds so the
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* bootloder has time to respond and service any
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* subsequent requests */
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Timeout = TIMEOUT_PERIOD - 500;
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/* Re-enable RWW section - must be done here in case
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* user has disabled verification on upload. */
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boot_rww_enable_safe();
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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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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 == 'L') || (Command == 'P'))
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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 == '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 == '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 += SPM_PAGESIZE)
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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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}
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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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#if !defined(NO_LOCK_BYTE_WRITE_SUPPORT)
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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
|
|
WriteNextResponseByte('\r');
|
|
}
|
|
#endif
|
|
else if (Command == 'r')
|
|
{
|
|
WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOCK_BITS));
|
|
}
|
|
else if (Command == 'F')
|
|
{
|
|
WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS));
|
|
}
|
|
else if (Command == 'N')
|
|
{
|
|
WriteNextResponseByte(boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS));
|
|
}
|
|
else if (Command == 'Q')
|
|
{
|
|
WriteNextResponseByte(boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS));
|
|
}
|
|
#if !defined(NO_BLOCK_SUPPORT)
|
|
else if (Command == 'b')
|
|
{
|
|
WriteNextResponseByte('Y');
|
|
|
|
// Send block size to the host
|
|
WriteNextResponseByte(SPM_PAGESIZE >> 8);
|
|
WriteNextResponseByte(SPM_PAGESIZE & 0xFF);
|
|
}
|
|
else if ((Command == 'B') || (Command == 'g'))
|
|
{
|
|
// Keep resetting the timeout counter if we're receiving self-programming instructions
|
|
Timeout = 0;
|
|
// Delegate the block write/read to a separate function for clarity
|
|
ReadWriteMemoryBlock(Command);
|
|
}
|
|
#endif
|
|
#if !defined(NO_FLASH_BYTE_SUPPORT)
|
|
else if (Command == 'C')
|
|
{
|
|
// Write the high byte to the current flash page
|
|
boot_page_fill(CurrAddress, FetchNextCommandByte());
|
|
|
|
// Send confirmation byte back to the host
|
|
WriteNextResponseByte('\r');
|
|
}
|
|
else if (Command == 'c')
|
|
{
|
|
// Write the low byte to the current flash page
|
|
boot_page_fill(CurrAddress | 0x01, FetchNextCommandByte());
|
|
|
|
// Increment the address
|
|
CurrAddress += 2;
|
|
|
|
// Send confirmation byte back to the host
|
|
WriteNextResponseByte('\r');
|
|
}
|
|
else if (Command == 'm')
|
|
{
|
|
// Commit the flash page to memory
|
|
boot_page_write(CurrAddress);
|
|
|
|
// Wait until write operation has completed
|
|
boot_spm_busy_wait();
|
|
|
|
// Send confirmation byte back to the host
|
|
WriteNextResponseByte('\r');
|
|
}
|
|
else if (Command == 'R')
|
|
{
|
|
#if (FLASHEND > 0xFFFF)
|
|
uint16_t ProgramWord = pgm_read_word_far(CurrAddress);
|
|
#else
|
|
uint16_t ProgramWord = pgm_read_word(CurrAddress);
|
|
#endif
|
|
|
|
WriteNextResponseByte(ProgramWord >> 8);
|
|
WriteNextResponseByte(ProgramWord & 0xFF);
|
|
}
|
|
#endif
|
|
#if !defined(NO_EEPROM_BYTE_SUPPORT)
|
|
else if (Command == 'D')
|
|
{
|
|
// Read the byte from the endpoint and write it to the EEPROM
|
|
eeprom_write_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte());
|
|
|
|
// Increment the address after use
|
|
CurrAddress += 2;
|
|
|
|
// Send confirmation byte back to the host
|
|
WriteNextResponseByte('\r');
|
|
}
|
|
else if (Command == 'd')
|
|
{
|
|
// Read the EEPROM byte and write it to the endpoint
|
|
WriteNextResponseByte(eeprom_read_byte((uint8_t*)((intptr_t)(CurrAddress >> 1))));
|
|
|
|
// Increment the address after use
|
|
CurrAddress += 2;
|
|
}
|
|
#endif
|
|
else if (Command != 27)
|
|
{
|
|
// Unknown (non-sync) command, return fail code
|
|
WriteNextResponseByte('?');
|
|
}
|
|
|
|
|
|
/* Select the IN endpoint */
|
|
Endpoint_SelectEndpoint(CDC_TX_EPNUM);
|
|
|
|
/* Remember if the endpoint is completely full before clearing it */
|
|
bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
|
|
|
|
/* Send the endpoint data to the host */
|
|
Endpoint_ClearIN();
|
|
|
|
/* If a full endpoint's worth of data was sent, we need to send an empty packet afterwards to signal end of transfer */
|
|
if (IsEndpointFull)
|
|
{
|
|
while (!(Endpoint_IsINReady()))
|
|
{
|
|
if (USB_DeviceState == DEVICE_STATE_Unattached)
|
|
return;
|
|
}
|
|
|
|
Endpoint_ClearIN();
|
|
}
|
|
|
|
/* Wait until the data has been sent to the host */
|
|
while (!(Endpoint_IsINReady()))
|
|
{
|
|
if (USB_DeviceState == DEVICE_STATE_Unattached)
|
|
return;
|
|
}
|
|
|
|
/* Select the OUT endpoint */
|
|
Endpoint_SelectEndpoint(CDC_RX_EPNUM);
|
|
|
|
/* Acknowledge the command from the host */
|
|
Endpoint_ClearOUT();
|
|
}
|
|
|