summaryrefslogtreecommitdiff
path: root/platforms/avr/bootloaders/halfkay.c
blob: 402f5f27786da2e14c6c4257851e7fc6dc8eafd8 (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
/* Copyright 2021 QMK
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "bootloader.h"

#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>

__attribute__((weak)) void bootloader_jump(void) {
    // 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
}

__attribute__((weak)) void mcu_reset(void) {
    // setup watchdog timeout
    wdt_enable(WDTO_60MS);

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