206 lines
6.6 KiB
C
206 lines
6.6 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/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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#ifdef PROTOCOL_LUFA
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#include <LUFA/Drivers/USB/USB.h>
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#endif
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/* 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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*
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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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*
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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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*
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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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#ifndef BOOTLOADER_SIZE
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#warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
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#define BOOTLOADER_SIZE 4096
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#endif
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#define FLASH_SIZE (FLASHEND + 1L)
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#define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE)
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/*
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* Entering the Bootloader via Software
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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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/* initialize MCU status by watchdog reset */
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void bootloader_jump(void) {
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#ifndef CATERINA_BOOTLOADER
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#ifdef PROTOCOL_LUFA
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USB_Disable();
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cli();
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_delay_ms(2000);
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#endif
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#ifdef PROTOCOL_PJRC
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cli();
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UDCON = 1;
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USBCON = (1<<FRZCLK);
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UCSR1B = 0;
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_delay_ms(5);
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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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#else
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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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#endif
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}
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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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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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((void (*)(void))(BOOTLOADER_START/2))();
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}
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}
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#if 0
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/* Jumping To The Bootloader
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* http://www.pjrc.com/teensy/jump_to_bootloader.html
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*
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* This method doen't work when using LUFA. idk why.
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* - needs to initialize more regisers or interrupt setting?
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*/
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void bootloader_jump(void) {
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#ifdef PROTOCOL_LUFA
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USB_Disable();
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cli();
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_delay_ms(2000);
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#endif
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#ifdef PROTOCOL_PJRC
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cli();
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UDCON = 1;
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USBCON = (1<<FRZCLK);
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UCSR1B = 0;
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_delay_ms(5);
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#endif
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/*
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* Initialize
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*/
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#if defined(__AVR_AT90USB162__)
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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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#elif defined(__AVR_ATmega32U4__)
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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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#elif defined(__AVR_AT90USB646__)
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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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#elif defined(__AVR_AT90USB1286__)
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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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#endif
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/*
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* USBaspLoader
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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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