#include <stdint.h> #include <stdbool.h> #include <avr/io.h> #include <avr/interrupt.h> #include <avr/wdt.h> #include <util/delay.h> #include "bootloader.h" #ifdef PROTOCOL_LUFA #include <LUFA/Drivers/USB/USB.h> #endif /* Bootloader Size in *bytes* * * AVR Boot section size are defined by setting BOOTSZ fuse in fact. Consult with your MCU datasheet. * Note that 'Word'(2 bytes) size and address are used in datasheet while TMK uses 'Byte'. * * * Size of Bootloaders in bytes: * Atmel DFU loader(ATmega32U4) 4096 * Atmel DFU loader(AT90USB128) 8192 * LUFA bootloader(ATmega32U4) 4096 * Arduino Caterina(ATmega32U4) 4096 * USBaspLoader(ATmega***) 2048 * Teensy halfKay(ATmega32U4) 512 * Teensy++ halfKay(AT90USB128) 1024 * * * AVR Boot section is located at the end of Flash memory like the followings. * * * byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB128) * 0x0000 +---------------+ 0x00000 +---------------+ * | | | | * | | | | * | Application | | Application | * | | | | * = = = = * | | 32KB-4KB | | 128KB-8KB * 0x6000 +---------------+ 0x1FC00 +---------------+ * | Bootloader | 4KB | Bootloader | 8KB * 0x7FFF +---------------+ 0x1FFFF +---------------+ * * * byte Teensy(ATMega32u4) byte Teensy++(AT90SUB128) * 0x0000 +---------------+ 0x00000 +---------------+ * | | | | * | | | | * | Application | | Application | * | | | | * = = = = * | | 32KB-512B | | 128KB-1KB * 0x7E00 +---------------+ 0x1FC00 +---------------+ * | Bootloader | 512B | Bootloader | 1KB * 0x7FFF +---------------+ 0x1FFFF +---------------+ */ #ifndef BOOTLOADER_SIZE #warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h. #define BOOTLOADER_SIZE 4096 #endif #define FLASH_SIZE (FLASHEND + 1L) #define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE) /* * Entering the Bootloader via Software * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html */ #define BOOTLOADER_RESET_KEY 0xB007B007 uint32_t reset_key __attribute__ ((section (".noinit"))); /* initialize MCU status by watchdog reset */ void bootloader_jump(void) { #ifndef CATERINA_BOOTLOADER #ifdef PROTOCOL_LUFA USB_Disable(); cli(); _delay_ms(2000); #endif #ifdef PROTOCOL_PJRC cli(); UDCON = 1; USBCON = (1<<FRZCLK); UCSR1B = 0; _delay_ms(5); #endif // watchdog reset reset_key = BOOTLOADER_RESET_KEY; wdt_enable(WDTO_250MS); for (;;); #else // this block may be optional // TODO: figure it out uint16_t *const bootKeyPtr = (uint16_t *)0x0800; // Value used by Caterina bootloader use to determine whether to run the // sketch or the bootloader programmer. uint16_t bootKey = 0x7777; *bootKeyPtr = bootKey; // setup watchdog timeout wdt_enable(WDTO_60MS); while(1) {} // wait for watchdog timer to trigger #endif } /* this runs before main() */ void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3"))); void bootloader_jump_after_watchdog_reset(void) { if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) { reset_key = 0; // My custom USBasploader requires this to come up. MCUSR = 0; // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog. MCUSR &= ~(1<<WDRF); wdt_disable(); // This is compled into 'icall', address should be in word unit, not byte. ((void (*)(void))(BOOTLOADER_START/2))(); } } #if 0 /* Jumping To The Bootloader * http://www.pjrc.com/teensy/jump_to_bootloader.html * * This method doen't work when using LUFA. idk why. * - needs to initialize more regisers or interrupt setting? */ void bootloader_jump(void) { #ifdef PROTOCOL_LUFA USB_Disable(); cli(); _delay_ms(2000); #endif #ifdef PROTOCOL_PJRC cli(); UDCON = 1; USBCON = (1<<FRZCLK); UCSR1B = 0; _delay_ms(5); #endif /* * Initialize */ #if defined(__AVR_AT90USB162__) EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0; DDRB = 0; DDRC = 0; DDRD = 0; PORTB = 0; PORTC = 0; PORTD = 0; #elif defined(__AVR_ATmega32U4__) EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0; #elif defined(__AVR_AT90USB646__) EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0; DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0; #elif defined(__AVR_AT90USB1286__) EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0; DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0; #endif /* * USBaspLoader */ #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__) // This makes custom USBasploader come up. MCUSR = 0; // initialize ports PORTB = 0; PORTC= 0; PORTD = 0; DDRB = 0; DDRC= 0; DDRD = 0; // disable interrupts EIMSK = 0; EECR = 0; SPCR = 0; ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0; TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; ADCSRA = 0; TWCR = 0; UCSR0B = 0; #endif // This is compled into 'icall', address should be in word unit, not byte. ((void (*)(void))(BOOTLOADER_START/2))(); } #endif