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git.gir.st - tmk_keyboard.git/blob - tmk_core/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 /* Bootloader Size in *bytes*
16 * AVR Boot section size are defined by setting BOOTSZ fuse in fact. Consult with your MCU datasheet.
17 * Note that 'Word'(2 bytes) size and address are used in datasheet while TMK uses 'Byte'.
20 * Size of Bootloaders in bytes:
21 * Atmel DFU loader(ATmega32U4) 4096
22 * Atmel DFU loader(AT90USB128) 8192
23 * LUFA bootloader(ATmega32U4) 4096
24 * Arduino Caterina(ATmega32U4) 4096
25 * USBaspLoader(ATmega***) 2048
26 * Teensy halfKay(ATmega32U4) 512
27 * Teensy++ halfKay(AT90USB128) 1024
30 * AVR Boot section is located at the end of Flash memory like the followings.
33 * byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB128)
34 * 0x0000 +---------------+ 0x00000 +---------------+
37 * | Application | | Application |
40 * | | 32KB-4KB | | 128KB-8KB
41 * 0x6000 +---------------+ 0x1FC00 +---------------+
42 * | Bootloader | 4KB | Bootloader | 8KB
43 * 0x7FFF +---------------+ 0x1FFFF +---------------+
46 * byte Teensy(ATMega32u4) byte Teensy++(AT90SUB128)
47 * 0x0000 +---------------+ 0x00000 +---------------+
50 * | Application | | Application |
53 * | | 32KB-512B | | 128KB-1KB
54 * 0x7E00 +---------------+ 0x1FC00 +---------------+
55 * | Bootloader | 512B | Bootloader | 1KB
56 * 0x7FFF +---------------+ 0x1FFFF +---------------+
58 #ifndef BOOTLOADER_SIZE
59 #warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
60 #define BOOTLOADER_SIZE 4096
63 #define FLASH_SIZE (FLASHEND + 1L)
64 #define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE)
68 * Entering the Bootloader via Software
69 * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
71 #define BOOTLOADER_RESET_KEY 0xB007B007
72 uint32_t reset_key
__attribute__ ((section (".noinit")));
74 /* initialize MCU status by watchdog reset */
75 void bootloader_jump(void) {
91 reset_key
= BOOTLOADER_RESET_KEY
;
92 wdt_enable(WDTO_250MS
);
97 /* this runs before main() */
98 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used
, naked
, section (".init3")));
99 void bootloader_jump_after_watchdog_reset(void)
101 if ((MCUSR
& (1<<WDRF
)) && reset_key
== BOOTLOADER_RESET_KEY
) {
104 // My custom USBasploader requires this to come up.
107 // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
111 // This is compled into 'icall', address should be in word unit, not byte.
112 ((void (*)(void))(BOOTLOADER_START
/2))();
118 /* Jumping To The Bootloader
119 * http://www.pjrc.com/teensy/jump_to_bootloader.html
121 * This method doen't work when using LUFA. idk why.
122 * - needs to initialize more regisers or interrupt setting?
124 void bootloader_jump(void) {
134 USBCON
= (1<<FRZCLK
);
142 #if defined(__AVR_AT90USB162__)
143 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0;
144 TIMSK0
= 0; TIMSK1
= 0; UCSR1B
= 0;
145 DDRB
= 0; DDRC
= 0; DDRD
= 0;
146 PORTB
= 0; PORTC
= 0; PORTD
= 0;
147 #elif defined(__AVR_ATmega32U4__)
148 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0; ADCSRA
= 0;
149 TIMSK0
= 0; TIMSK1
= 0; TIMSK3
= 0; TIMSK4
= 0; UCSR1B
= 0; TWCR
= 0;
150 DDRB
= 0; DDRC
= 0; DDRD
= 0; DDRE
= 0; DDRF
= 0; TWCR
= 0;
151 PORTB
= 0; PORTC
= 0; PORTD
= 0; PORTE
= 0; PORTF
= 0;
152 #elif defined(__AVR_AT90USB646__)
153 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0; ADCSRA
= 0;
154 TIMSK0
= 0; TIMSK1
= 0; TIMSK2
= 0; TIMSK3
= 0; UCSR1B
= 0; TWCR
= 0;
155 DDRA
= 0; DDRB
= 0; DDRC
= 0; DDRD
= 0; DDRE
= 0; DDRF
= 0;
156 PORTA
= 0; PORTB
= 0; PORTC
= 0; PORTD
= 0; PORTE
= 0; PORTF
= 0;
157 #elif defined(__AVR_AT90USB1286__)
158 EIMSK
= 0; PCICR
= 0; SPCR
= 0; ACSR
= 0; EECR
= 0; ADCSRA
= 0;
159 TIMSK0
= 0; TIMSK1
= 0; TIMSK2
= 0; TIMSK3
= 0; UCSR1B
= 0; TWCR
= 0;
160 DDRA
= 0; DDRB
= 0; DDRC
= 0; DDRD
= 0; DDRE
= 0; DDRF
= 0;
161 PORTA
= 0; PORTB
= 0; PORTC
= 0; PORTD
= 0; PORTE
= 0; PORTF
= 0;
167 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
168 // This makes custom USBasploader come up.
172 PORTB
= 0; PORTC
= 0; PORTD
= 0;
173 DDRB
= 0; DDRC
= 0; DDRD
= 0;
175 // disable interrupts
176 EIMSK
= 0; EECR
= 0; SPCR
= 0;
177 ACSR
= 0; SPMCSR
= 0; WDTCSR
= 0; PCICR
= 0;
178 TIMSK0
= 0; TIMSK1
= 0; TIMSK2
= 0;
179 ADCSRA
= 0; TWCR
= 0; UCSR0B
= 0;
182 // This is compled into 'icall', address should be in word unit, not byte.
183 ((void (*)(void))(BOOTLOADER_START
/2))();