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Before the sketch initiates an auto-reset for upload it pokes a magic word into a specific RAM address. On starting the bootloader checks this address. If it finds the magic word it knows the bootloader code should run. If not it jumps straight back to sketch. Test in a sketch by adding to setup(): wdt_enable(WDTO_2S); Sketch should upload, start, run for two seconds, WDT, and sketch should restart (not bootloader). Had to cut out unused descriptor code to make the bootloader still fit in 4k.
100 lines
3.1 KiB
C
Executable File
100 lines
3.1 KiB
C
Executable File
/*
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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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* Header file for BootloaderCDC.c.
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*/
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#ifndef _CDC_H_
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#define _CDC_H_
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/* Includes: */
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#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/boot.h>
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#include <avr/eeprom.h>
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#include <avr/power.h>
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#include <avr/interrupt.h>
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#include <stdbool.h>
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#include "Descriptors.h"
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#include <LUFA/Drivers/USB/USB.h>
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/* Macros: */
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/** Version major of the CDC bootloader. */
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#define BOOTLOADER_VERSION_MAJOR 0x01
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/** Version minor of the CDC bootloader. */
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#define BOOTLOADER_VERSION_MINOR 0x00
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/** Hardware version major of the CDC bootloader. */
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#define BOOTLOADER_HWVERSION_MAJOR 0x01
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/** Hardware version minor of the CDC bootloader. */
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#define BOOTLOADER_HWVERSION_MINOR 0x00
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/** Eight character bootloader firmware identifier reported to the host when requested */
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#define SOFTWARE_IDENTIFIER "CATERINA"
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#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
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#define LED_SETUP() DDRC |= (1<<7); DDRB |= (1<<0); DDRD |= (1<<5);
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#define L_LED_OFF() PORTC &= ~(1<<7)
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#define L_LED_ON() PORTC |= (1<<7)
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#define L_LED_TOGGLE() PORTC ^= (1<<7)
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#define TX_LED_OFF() PORTD |= (1<<5)
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#define TX_LED_ON() PORTD &= ~(1<<5)
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#define RX_LED_OFF() PORTB |= (1<<0)
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#define RX_LED_ON() PORTB &= ~(1<<0)
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/* Type Defines: */
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/** Type define for a non-returning pointer to the start of the loaded application in flash memory. */
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typedef void (*AppPtr_t)(void) ATTR_NO_RETURN;
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/* Function Prototypes: */
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void StartSketch(void);
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void LEDPulse(void);
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void CDC_Task(void);
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void SetupHardware(void);
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void EVENT_USB_Device_ConfigurationChanged(void);
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#if defined(INCLUDE_FROM_CATERINA_C) || defined(__DOXYGEN__)
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#if !defined(NO_BLOCK_SUPPORT)
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static void ReadWriteMemoryBlock(const uint8_t Command);
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#endif
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static uint8_t FetchNextCommandByte(void);
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static void WriteNextResponseByte(const uint8_t Response);
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#endif
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#endif
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