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git.gir.st - tmk_keyboard.git/blob - common/avr/bootloader.c
4 #include <avr/interrupt.h>
6 #include <util/delay.h>
7 #include "bootloader.h"
10 #include <LUFA/Drivers/USB/USB.h>
14 /* Boot Section Size in *BYTEs*
16 * Teensy++ halfKay 1024
17 * Atmel DFU loader 4096
18 * LUFA bootloader 4096
21 #ifndef BOOTLOADER_SIZE
22 #warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
23 #define BOOTLOADER_SIZE 4096
26 #define FLASH_SIZE (FLASHEND + 1L)
27 #define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE)
31 * Entering the Bootloader via Software
32 * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
34 #define BOOTLOADER_RESET_KEY 0xB007B007
35 uint32_t reset_key
__attribute__ ((section (".noinit")));
37 /* initialize MCU status by watchdog reset */
38 void bootloader_jump(void) {
54 reset_key
= BOOTLOADER_RESET_KEY
;
55 wdt_enable(WDTO_250MS
);
60 /* this runs before main() */
61 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used
, naked
, section (".init3")));
62 void bootloader_jump_after_watchdog_reset(void)
64 if ((MCUSR
& (1<<WDRF
)) && reset_key
== BOOTLOADER_RESET_KEY
) {
67 // My custom USBasploader requires this to come up.
70 // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
74 // This is compled into 'icall', address should be in word unit, not byte.
75 ((void (*)(void))(BOOTLOADER_START
/2))();
81 /* Jumping To The Bootloader
82 * http://www.pjrc.com/teensy/jump_to_bootloader.html
84 * This method doen't work when using LUFA. idk why.
85 * - needs to initialize more regisers or interrupt setting?
87 void bootloader_jump(void) {
105 #if defined(__AVR_AT90USB162__)
106 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0;
107 TIMSK0
= 0; TIMSK1
= 0; UCSR1B
= 0;
108 DDRB
= 0; DDRC
= 0; DDRD
= 0;
109 PORTB
= 0; PORTC
= 0; PORTD
= 0;
110 #elif defined(__AVR_ATmega32U4__)
111 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0; ADCSRA
= 0;
112 TIMSK0
= 0; TIMSK1
= 0; TIMSK3
= 0; TIMSK4
= 0; UCSR1B
= 0; TWCR
= 0;
113 DDRB
= 0; DDRC
= 0; DDRD
= 0; DDRE
= 0; DDRF
= 0; TWCR
= 0;
114 PORTB
= 0; PORTC
= 0; PORTD
= 0; PORTE
= 0; PORTF
= 0;
115 #elif defined(__AVR_AT90USB646__)
116 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0; ADCSRA
= 0;
117 TIMSK0
= 0; TIMSK1
= 0; TIMSK2
= 0; TIMSK3
= 0; UCSR1B
= 0; TWCR
= 0;
118 DDRA
= 0; DDRB
= 0; DDRC
= 0; DDRD
= 0; DDRE
= 0; DDRF
= 0;
119 PORTA
= 0; PORTB
= 0; PORTC
= 0; PORTD
= 0; PORTE
= 0; PORTF
= 0;
120 #elif defined(__AVR_AT90USB1286__)
121 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0; ADCSRA
= 0;
122 TIMSK0
= 0; TIMSK1
= 0; TIMSK2
= 0; TIMSK3
= 0; UCSR1B
= 0; TWCR
= 0;
123 DDRA
= 0; DDRB
= 0; DDRC
= 0; DDRD
= 0; DDRE
= 0; DDRF
= 0;
124 PORTA
= 0; PORTB
= 0; PORTC
= 0; PORTD
= 0; PORTE
= 0; PORTF
= 0;
130 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
131 // This makes custom USBasploader come up.
135 PORTB
= 0; PORTC
= 0; PORTD
= 0;
136 DDRB
= 0; DDRC
= 0; DDRD
= 0;
138 // disable interrupts
139 EIMSK
= 0; EECR
= 0; SPCR
= 0;
140 ACSR
= 0; SPMCSR
= 0; WDTCSR
= 0; PCICR
= 0;
141 TIMSK0
= 0; TIMSK1
= 0; TIMSK2
= 0;
142 ADCSRA
= 0; TWCR
= 0; UCSR0B
= 0;
145 // This is compled into 'icall', address should be in word unit, not byte.
146 ((void (*)(void))(BOOTLOADER_START
/2))();