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- #include <stdint.h>
- #include <stdbool.h>
- #include <avr/io.h>
- #include <avr/eeprom.h>
- #include <avr/interrupt.h>
- #include <avr/wdt.h>
- #include <util/delay.h>
- #include "bootloader.h"
- #ifndef __AVR_XMEGA__
- #include <avr/boot.h>
- #endif
-
- #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
- * 0x7000 +---------------+ 0x1E000 +---------------+
- * | 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 +---------------+
- */
-
- #define FLASH_SIZE (FLASHEND + 1L)
-
- #if !defined(BOOTLOADER_SIZE)
- uint16_t bootloader_start;
- #endif
-
- #define BOOT_SIZE_256 0b110
- #define BOOT_SIZE_512 0b100
- #define BOOT_SIZE_1024 0b010
- #define BOOT_SIZE_2048 0b000
-
- /*
- * 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) {
-
- #if !defined(BOOTLOADER_SIZE)
- uint8_t high_fuse = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
-
- if (high_fuse & BOOT_SIZE_256) {
- bootloader_start = (FLASH_SIZE - 512) >> 1;
- } else if (high_fuse & BOOT_SIZE_512) {
- bootloader_start = (FLASH_SIZE - 1024) >> 1;
- } else if (high_fuse & BOOT_SIZE_1024) {
- bootloader_start = (FLASH_SIZE - 2048) >> 1;
- } else {
- bootloader_start = (FLASH_SIZE - 4096) >> 1;
- }
- #endif
-
- // Something like this might work, but it compiled larger than the block above
- // bootloader_start = FLASH_SIZE - (256 << (~high_fuse & 0b110 >> 1));
-
-
- #if defined(BOOTLOADER_HALFKAY)
- // http://www.pjrc.com/teensy/jump_to_bootloader.html
- cli();
- // disable watchdog, if enabled (it's not)
- // disable all peripherals
- // a shutdown call might make sense here
- UDCON = 1;
- USBCON = (1<<FRZCLK); // disable USB
- UCSR1B = 0;
- _delay_ms(5);
- #if defined(__AVR_AT90USB162__) // Teensy 1.0
- 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;
- asm volatile("jmp 0x3E00");
- #elif defined(__AVR_ATmega32U4__) // Teensy 2.0
- 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;
- asm volatile("jmp 0x7E00");
- #elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
- 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;
- asm volatile("jmp 0xFC00");
- #elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
- 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;
- asm volatile("jmp 0x1FC00");
- #endif
-
- #elif defined(BOOTLOADER_CATERINA)
- // 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
-
- #else // Assume remaining boards are DFU, even if the flag isn't set
-
- #ifdef BOOTLOADER_BOOTLOADHID // no USB - maybe BOOTLOADER_BOOTLOADHID instead though?
- UDCON = 1;
- USBCON = (1<<FRZCLK); // disable USB
- UCSR1B = 0;
- _delay_ms(5); // 5 seems to work fine
- #endif
-
- #ifdef BOOTLOADER_BOOTLOADHID
- // force bootloadHID to stay in bootloader mode, so that it waits
- // for a new firmware to be flashed
- eeprom_write_byte((uint8_t *)1, 0x00);
- #endif
-
- // watchdog reset
- reset_key = BOOTLOADER_RESET_KEY;
- wdt_enable(WDTO_250MS);
- for (;;);
- #endif
-
- }
-
- #ifdef __AVR_ATmega32A__
- // MCUSR is actually called MCUCSR in ATmega32A
- #define MCUSR MCUCSR
- #endif
-
- #ifdef __AVR_XMEGA__
- #define MCUSR RST_STATUS
- #define WDRF RST_WDRF_bp
- #endif
-
- /* this runs before main() */
- void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
- void bootloader_jump_after_watchdog_reset(void)
- {
- #ifndef BOOTLOADER_HALFKAY
- 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.
- #ifdef BOOTLOADER_SIZE
- ((void (*)(void))( (FLASH_SIZE - BOOTLOADER_SIZE) >> 1))();
- #else
- asm("ijmp" :: "z" (bootloader_start));
- #endif
- }
- #endif
- }
-
-
- #if 0
- /*
- * USBaspLoader - I'm not sure if this is used at all in any projects
- * would love to support it if it is -Jack
- */
- #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
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