summaryrefslogtreecommitdiffstats
path: root/tmk_core/common/avr/bootloader.c
blob: 3cdcd2e426b6b68a774b955c900e18962a60d28a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include "bootloader.h"
#include <avr/boot.h>

#ifdef PROTOCOL_LUFA
#include <LUFA/Drivers/USB/USB.h>
#endif


/** \brief Bootloader Size in *bytes*
 *
 * AVR Boot section size are defined by setting BOOTSZ fuse in fact. Consult with your MCU datasheet.
 * Note that 'Word'(2 bytes) size and address are used in datasheet while TMK uses 'Byte'.
 *
 * Size of Bootloaders in bytes:
 *   Atmel DFU loader(ATmega32U4)   4096
 *   Atmel DFU loader(AT90USB128)   8192
 *   LUFA bootloader(ATmega32U4)    4096
 *   Arduino Caterina(ATmega32U4)   4096
 *   USBaspLoader(ATmega***)        2048
 *   Teensy   halfKay(ATmega32U4)   512
 *   Teensy++ halfKay(AT90USB128)   1024
 *
 * AVR Boot section is located at the end of Flash memory like the followings.
 *
 * byte     Atmel/LUFA(ATMega32u4)          byte     Atmel(AT90SUB128)
 * 0x0000   +---------------+               0x00000  +---------------+
 *          |               |                        |               |
 *          |               |                        |               |
 *          |  Application  |                        |  Application  |
 *          |               |                        |               |
 *          =               =                        =               =
 *          |               | 32KB-4KB               |               | 128KB-8KB
 * 0x7000   +---------------+               0x1E000  +---------------+
 *          |  Bootloader   | 4KB                    |  Bootloader   | 8KB
 * 0x7FFF   +---------------+               0x1FFFF  +---------------+
 *
 *
 * byte     Teensy(ATMega32u4)              byte     Teensy++(AT90SUB128)
 * 0x0000   +---------------+               0x00000  +---------------+
 *          |               |                        |               |
 *          |               |                        |               |
 *          |  Application  |                        |  Application  |
 *          |               |                        |               |
 *          =               =                        =               =
 *          |               | 32KB-512B              |               | 128KB-1KB
 * 0x7E00   +---------------+               0x1FC00  +---------------+
 *          |  Bootloader   | 512B                   |  Bootloader   | 1KB
 * 0x7FFF   +---------------+               0x1FFFF  +---------------+
 */
#define FLASH_SIZE (FLASHEND + 1L)

#if !defined(BOOTLOADER_SIZE)
    uint16_t bootloader_start;
#endif

#define BOOT_SIZE_256  0b110
#define BOOT_SIZE_512  0b100
#define BOOT_SIZE_1024 0b010
#define BOOT_SIZE_2048 0b000

/** \brief Entering the Bootloader via Software
 *
 * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
 */
#define BOOTLOADER_RESET_KEY 0xB007B007
uint32_t reset_key  __attribute__ ((section (".noinit,\"aw\",@nobits;")));

/** \brief initialize MCU status by watchdog reset
 *
 * FIXME: needs doc
 */
void bootloader_jump(void) {

    #if !defined(BOOTLOADER_SIZE)
        uint8_t high_fuse = boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS);

        if (high_fuse & BOOT_SIZE_256) {
            bootloader_start = (FLASH_SIZE - 512) >> 1;
        } else if (high_fuse & BOOT_SIZE_512) {
            bootloader_start = (FLASH_SIZE - 1024) >> 1;
        } else if (high_fuse & BOOT_SIZE_1024) {
            bootloader_start = (FLASH_SIZE - 2048) >> 1;
        } else {
            bootloader_start = (FLASH_SIZE - 4096) >> 1;
        }
    #endif

    // Something like this might work, but it compiled larger than the block above
    // bootloader_start = FLASH_SIZE - (256 << (~high_fuse & 0b110 >> 1));


    #if defined(BOOTLOADER_HALFKAY)
        //  http://www.pjrc.com/teensy/jump_to_bootloader.html
        cli();
        // disable watchdog, if enabled (it's not)
        // disable all peripherals
        // a shutdown call might make sense here
        UDCON = 1;
        USBCON = (1<<FRZCLK);  // disable USB
        UCSR1B = 0;
        _delay_ms(5);
        #if defined(__AVR_AT90USB162__)                // Teensy 1.0
            EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
            TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
            DDRB = 0; DDRC = 0; DDRD = 0;
            PORTB = 0; PORTC = 0; PORTD = 0;
            asm volatile("jmp 0x3E00");
        #elif defined(__AVR_ATmega32U4__)              // Teensy 2.0
            EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
            TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
            DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
            PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
            asm volatile("jmp 0x7E00");
        #elif defined(__AVR_AT90USB646__)              // Teensy++ 1.0
            EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
            TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
            DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
            PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
            asm volatile("jmp 0xFC00");
        #elif defined(__AVR_AT90USB1286__)             // Teensy++ 2.0
            EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
            TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
            DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
            PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
            asm volatile("jmp 0x1FC00");
        #endif

    #elif defined(BOOTLOADER_CATERINA)
        // this block may be optional
        // TODO: figure it out

        uint16_t *const bootKeyPtr = (uint16_t *)0x0800;

        // Value used by Caterina bootloader use to determine whether to run the
        // sketch or the bootloader programmer.
        uint16_t bootKey = 0x7777;

        *bootKeyPtr = bootKey;

        // setup watchdog timeout
        wdt_enable(WDTO_60MS);

        while(1) {} // wait for watchdog timer to trigger

    #else // Assume remaining boards are DFU, even if the flag isn't set

        #if !(defined(__AVR_ATmega32A__) || defined(__AVR_ATmega328P__)) // no USB - maybe BOOTLOADER_BOOTLOADHID instead though?
            UDCON = 1;
            USBCON = (1<<FRZCLK);  // disable USB
            UCSR1B = 0;
            _delay_ms(5); // 5 seems to work fine
        #endif

        #ifdef BOOTLOADER_BOOTLOADHID
            // force bootloadHID to stay in bootloader mode, so that it waits
            // for a new firmware to be flashed
            eeprom_write_byte((uint8_t *)1, 0x00);
        #endif

        // watchdog reset
        reset_key = BOOTLOADER_RESET_KEY;
        wdt_enable(WDTO_250MS);
        for (;;);
    #endif

}

#ifdef __AVR_ATmega32A__
    // MCUSR is actually called MCUCSR in ATmega32A
    #define MCUSR MCUCSR
#endif

/* this runs before main() */
void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
void bootloader_jump_after_watchdog_reset(void)
{
    #ifndef BOOTLOADER_HALFKAY
        if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
            reset_key = 0;

            // My custom USBasploader requires this to come up.
            MCUSR = 0;

            // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
            MCUSR &= ~(1<<WDRF);
            wdt_disable();


            // This is compled into 'icall', address should be in word unit, not byte.
            #ifdef BOOTLOADER_SIZE
                ((void (*)(void))( (FLASH_SIZE - BOOTLOADER_SIZE) >> 1))();
            #else
                asm("ijmp" :: "z" (bootloader_start));
            #endif
        }
    #endif
}


#if 0
    /*
     * USBaspLoader - I'm not sure if this is used at all in any projects
     *                would love to support it if it is -Jack
     */
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
    // This makes custom USBasploader come up.
    MCUSR = 0;

    // initialize ports
    PORTB = 0; PORTC= 0; PORTD = 0;
    DDRB = 0; DDRC= 0; DDRD = 0;

    // disable interrupts
    EIMSK = 0; EECR = 0; SPCR = 0;
    ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
    TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
    ADCSRA = 0; TWCR = 0; UCSR0B = 0;
#endif

    // This is compled into 'icall', address should be in word unit, not byte.
    ((void (*)(void))(BOOTLOADER_START/2))();
}
#endif