4 #include <avr/eeprom.h>
5 #include <avr/interrupt.h>
7 #include <util/delay.h>
8 #include "bootloader.h"
12 #include <LUFA/Drivers/USB/USB.h>
16 /* Bootloader Size in *bytes*
18 * AVR Boot section size are defined by setting BOOTSZ fuse in fact. Consult with your MCU datasheet.
19 * Note that 'Word'(2 bytes) size and address are used in datasheet while TMK uses 'Byte'.
22 * Size of Bootloaders in bytes:
23 * Atmel DFU loader(ATmega32U4) 4096
24 * Atmel DFU loader(AT90USB128) 8192
25 * LUFA bootloader(ATmega32U4) 4096
26 * Arduino Caterina(ATmega32U4) 4096
27 * USBaspLoader(ATmega***) 2048
28 * Teensy halfKay(ATmega32U4) 512
29 * Teensy++ halfKay(AT90USB128) 1024
32 * AVR Boot section is located at the end of Flash memory like the followings.
35 * byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB128)
36 * 0x0000 +---------------+ 0x00000 +---------------+
39 * | Application | | Application |
42 * | | 32KB-4KB | | 128KB-8KB
43 * 0x7000 +---------------+ 0x1E000 +---------------+
44 * | Bootloader | 4KB | Bootloader | 8KB
45 * 0x7FFF +---------------+ 0x1FFFF +---------------+
48 * byte Teensy(ATMega32u4) byte Teensy++(AT90SUB128)
49 * 0x0000 +---------------+ 0x00000 +---------------+
52 * | Application | | Application |
55 * | | 32KB-512B | | 128KB-1KB
56 * 0x7E00 +---------------+ 0x1FC00 +---------------+
57 * | Bootloader | 512B | Bootloader | 1KB
58 * 0x7FFF +---------------+ 0x1FFFF +---------------+
61 #define FLASH_SIZE (FLASHEND + 1L)
63 #if !defined(BOOTLOADER_SIZE)
64 uint16_t bootloader_start;
67 #define BOOT_SIZE_256 0b110
68 #define BOOT_SIZE_512 0b100
69 #define BOOT_SIZE_1024 0b010
70 #define BOOT_SIZE_2048 0b000
73 * Entering the Bootloader via Software
74 * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
76 #define BOOTLOADER_RESET_KEY 0xB007B007
77 uint32_t reset_key __attribute__ ((section (".noinit")));
79 /* initialize MCU status by watchdog reset */
80 void bootloader_jump(void) {
82 #if !defined(BOOTLOADER_SIZE)
83 uint8_t high_fuse = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);
85 if (high_fuse & BOOT_SIZE_256) {
86 bootloader_start = (FLASH_SIZE - 512) >> 1;
87 } else if (high_fuse & BOOT_SIZE_512) {
88 bootloader_start = (FLASH_SIZE - 1024) >> 1;
89 } else if (high_fuse & BOOT_SIZE_1024) {
90 bootloader_start = (FLASH_SIZE - 2048) >> 1;
92 bootloader_start = (FLASH_SIZE - 4096) >> 1;
96 // Something like this might work, but it compiled larger than the block above
97 // bootloader_start = FLASH_SIZE - (256 << (~high_fuse & 0b110 >> 1));
100 #if defined(BOOTLOADER_HALFKAY)
101 // http://www.pjrc.com/teensy/jump_to_bootloader.html
103 // disable watchdog, if enabled (it's not)
104 // disable all peripherals
105 // a shutdown call might make sense here
107 USBCON = (1<<FRZCLK); // disable USB
110 #if defined(__AVR_AT90USB162__) // Teensy 1.0
111 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
112 TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
113 DDRB = 0; DDRC = 0; DDRD = 0;
114 PORTB = 0; PORTC = 0; PORTD = 0;
115 asm volatile("jmp 0x3E00");
116 #elif defined(__AVR_ATmega32U4__) // Teensy 2.0
117 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
118 TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
119 DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
120 PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
121 asm volatile("jmp 0x7E00");
122 #elif defined(__AVR_AT90USB646__) // Teensy++ 1.0
123 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
124 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
125 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
126 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
127 asm volatile("jmp 0xFC00");
128 #elif defined(__AVR_AT90USB1286__) // Teensy++ 2.0
129 EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
130 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
131 DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
132 PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
133 asm volatile("jmp 0x1FC00");
136 #elif defined(BOOTLOADER_CATERINA)
137 // this block may be optional
138 // TODO: figure it out
140 uint16_t *const bootKeyPtr = (uint16_t *)0x0800;
142 // Value used by Caterina bootloader use to determine whether to run the
143 // sketch or the bootloader programmer.
144 uint16_t bootKey = 0x7777;
146 *bootKeyPtr = bootKey;
148 // setup watchdog timeout
149 wdt_enable(WDTO_60MS);
151 while(1) {} // wait for watchdog timer to trigger
153 #else // Assume remaining boards are DFU, even if the flag isn't set
155 #ifndef __AVR_ATmega32A__ // no USB - maybe BOOTLOADER_BOOTLOADHID instead though?
157 USBCON = (1<<FRZCLK); // disable USB
159 _delay_ms(5); // 5 seems to work fine
162 #ifdef BOOTLOADER_BOOTLOADHID
163 // force bootloadHID to stay in bootloader mode, so that it waits
164 // for a new firmware to be flashed
165 eeprom_write_byte((uint8_t *)1, 0x00);
169 reset_key = BOOTLOADER_RESET_KEY;
170 wdt_enable(WDTO_250MS);
176 #ifdef __AVR_ATmega32A__
177 // MCUSR is actually called MCUCSR in ATmega32A
181 /* this runs before main() */
182 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
183 void bootloader_jump_after_watchdog_reset(void)
185 #ifndef BOOTLOADER_HALFKAY
186 if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
189 // My custom USBasploader requires this to come up.
192 // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
197 // This is compled into 'icall', address should be in word unit, not byte.
198 #ifdef BOOTLOADER_SIZE
199 ((void (*)(void))( (FLASH_SIZE - BOOTLOADER_SIZE) >> 1))();
201 asm("ijmp" :: "z" (bootloader_start));
210 * USBaspLoader - I'm not sure if this is used at all in any projects
211 * would love to support it if it is -Jack
213 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
214 // This makes custom USBasploader come up.
218 PORTB = 0; PORTC= 0; PORTD = 0;
219 DDRB = 0; DDRC= 0; DDRD = 0;
221 // disable interrupts
222 EIMSK = 0; EECR = 0; SPCR = 0;
223 ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
224 TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
225 ADCSRA = 0; TWCR = 0; UCSR0B = 0;
228 // This is compled into 'icall', address should be in word unit, not byte.
229 ((void (*)(void))(BOOTLOADER_START/2))();