231 lines
8.4 KiB
C
231 lines
8.4 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <avr/eeprom.h>
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#include <avr/interrupt.h>
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#include <avr/wdt.h>
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#include <util/delay.h>
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#include "bootloader.h"
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#include <avr/boot.h>
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#ifdef PROTOCOL_LUFA
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#include <LUFA/Drivers/USB/USB.h>
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#endif
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/** \brief Bootloader Size in *bytes*
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*
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* AVR Boot section size are defined by setting BOOTSZ fuse in fact. Consult with your MCU datasheet.
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* Note that 'Word'(2 bytes) size and address are used in datasheet while TMK uses 'Byte'.
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*
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* Size of Bootloaders in bytes:
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* Atmel DFU loader(ATmega32U4) 4096
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* Atmel DFU loader(AT90USB128) 8192
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* LUFA bootloader(ATmega32U4) 4096
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* Arduino Caterina(ATmega32U4) 4096
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* USBaspLoader(ATmega***) 2048
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* Teensy halfKay(ATmega32U4) 512
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* Teensy++ halfKay(AT90USB128) 1024
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*
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* AVR Boot section is located at the end of Flash memory like the followings.
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*
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* byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB128)
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* 0x0000 +---------------+ 0x00000 +---------------+
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* | | | |
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* | | | |
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* | Application | | Application |
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* | | | |
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* = = = =
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* | | 32KB-4KB | | 128KB-8KB
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* 0x7000 +---------------+ 0x1E000 +---------------+
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* | Bootloader | 4KB | Bootloader | 8KB
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* 0x7FFF +---------------+ 0x1FFFF +---------------+
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*
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*
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* byte Teensy(ATMega32u4) byte Teensy++(AT90SUB128)
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* 0x0000 +---------------+ 0x00000 +---------------+
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* | | | |
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* | | | |
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* | Application | | Application |
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* | | | |
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* = = = =
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* | | 32KB-512B | | 128KB-1KB
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* 0x7E00 +---------------+ 0x1FC00 +---------------+
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* | Bootloader | 512B | Bootloader | 1KB
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* 0x7FFF +---------------+ 0x1FFFF +---------------+
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*/
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#define FLASH_SIZE (FLASHEND + 1L)
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#if !defined(BOOTLOADER_SIZE)
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uint16_t bootloader_start;
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#endif
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#define BOOT_SIZE_256 0b110
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#define BOOT_SIZE_512 0b100
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#define BOOT_SIZE_1024 0b010
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#define BOOT_SIZE_2048 0b000
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/** \brief Entering the Bootloader via Software
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*
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* http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
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*/
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#define BOOTLOADER_RESET_KEY 0xB007B007
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uint32_t reset_key __attribute__ ((section (".noinit")));
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/** \brief initialize MCU status by watchdog reset
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*
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* FIXME: needs doc
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*/
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void bootloader_jump(void) {
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#if !defined(BOOTLOADER_SIZE)
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uint8_t high_fuse = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
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if (high_fuse & BOOT_SIZE_256) {
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bootloader_start = (FLASH_SIZE - 512) >> 1;
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} else if (high_fuse & BOOT_SIZE_512) {
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bootloader_start = (FLASH_SIZE - 1024) >> 1;
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} else if (high_fuse & BOOT_SIZE_1024) {
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bootloader_start = (FLASH_SIZE - 2048) >> 1;
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} else {
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bootloader_start = (FLASH_SIZE - 4096) >> 1;
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}
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#endif
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// Something like this might work, but it compiled larger than the block above
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// bootloader_start = FLASH_SIZE - (256 << (~high_fuse & 0b110 >> 1));
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#if defined(BOOTLOADER_HALFKAY)
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// http://www.pjrc.com/teensy/jump_to_bootloader.html
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cli();
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// disable watchdog, if enabled (it's not)
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// disable all peripherals
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// a shutdown call might make sense here
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UDCON = 1;
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USBCON = (1<<FRZCLK); // disable USB
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UCSR1B = 0;
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_delay_ms(5);
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#if defined(__AVR_AT90USB162__) // Teensy 1.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
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TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
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DDRB = 0; DDRC = 0; DDRD = 0;
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PORTB = 0; PORTC = 0; PORTD = 0;
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asm volatile("jmp 0x3E00");
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#elif defined(__AVR_ATmega32U4__) // Teensy 2.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
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DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
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PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
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asm volatile("jmp 0x7E00");
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#elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
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DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
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PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
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asm volatile("jmp 0xFC00");
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#elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
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EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
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DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
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PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
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asm volatile("jmp 0x1FC00");
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#endif
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#elif defined(BOOTLOADER_CATERINA)
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// this block may be optional
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// TODO: figure it out
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uint16_t *const bootKeyPtr = (uint16_t *)0x0800;
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// Value used by Caterina bootloader use to determine whether to run the
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// sketch or the bootloader programmer.
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uint16_t bootKey = 0x7777;
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*bootKeyPtr = bootKey;
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// setup watchdog timeout
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wdt_enable(WDTO_60MS);
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while(1) {} // wait for watchdog timer to trigger
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#else // Assume remaining boards are DFU, even if the flag isn't set
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#if !(defined(__AVR_ATmega32A__) || defined(__AVR_ATmega328P__)) // no USB - maybe BOOTLOADER_BOOTLOADHID instead though?
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UDCON = 1;
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USBCON = (1<<FRZCLK); // disable USB
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UCSR1B = 0;
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_delay_ms(5); // 5 seems to work fine
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#endif
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#ifdef BOOTLOADER_BOOTLOADHID
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// force bootloadHID to stay in bootloader mode, so that it waits
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// for a new firmware to be flashed
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eeprom_write_byte((uint8_t *)1, 0x00);
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#endif
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// watchdog reset
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reset_key = BOOTLOADER_RESET_KEY;
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wdt_enable(WDTO_250MS);
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for (;;);
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#endif
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}
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#ifdef __AVR_ATmega32A__
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// MCUSR is actually called MCUCSR in ATmega32A
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#define MCUSR MCUCSR
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#endif
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/* this runs before main() */
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void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
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void bootloader_jump_after_watchdog_reset(void)
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{
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#ifndef BOOTLOADER_HALFKAY
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if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
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reset_key = 0;
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// My custom USBasploader requires this to come up.
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MCUSR = 0;
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// Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
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MCUSR &= ~(1<<WDRF);
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wdt_disable();
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// This is compled into 'icall', address should be in word unit, not byte.
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#ifdef BOOTLOADER_SIZE
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((void (*)(void))( (FLASH_SIZE - BOOTLOADER_SIZE) >> 1))();
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#else
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asm("ijmp" :: "z" (bootloader_start));
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#endif
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}
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#endif
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}
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#if 0
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/*
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* USBaspLoader - I'm not sure if this is used at all in any projects
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* would love to support it if it is -Jack
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*/
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#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
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// This makes custom USBasploader come up.
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MCUSR = 0;
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// initialize ports
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PORTB = 0; PORTC= 0; PORTD = 0;
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DDRB = 0; DDRC= 0; DDRD = 0;
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// disable interrupts
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EIMSK = 0; EECR = 0; SPCR = 0;
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ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
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TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
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ADCSRA = 0; TWCR = 0; UCSR0B = 0;
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#endif
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// This is compled into 'icall', address should be in word unit, not byte.
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((void (*)(void))(BOOTLOADER_START/2))();
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}
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#endif
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