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
|
/*
* fsm-pcint.c: PCINT (Pin Change Interrupt) functions for SpaghettiMonster.
*
* Copyright (C) 2017 Selene Scriven
*
* 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/>.
*/
#ifndef FSM_PCINT_C
#define FSM_PCINT_C
#include <avr/interrupt.h>
#include <util/delay_basic.h>
uint8_t button_is_pressed() {
uint8_t value = ((SWITCH_PORT & (1<<SWITCH_PIN)) == 0);
button_last_state = value;
return value;
}
inline void PCINT_on() {
#if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85)
// enable pin change interrupt
GIMSK |= (1 << PCIE);
// only pay attention to the e-switch pin
#if 0 // this is redundant; was already done in main()
PCMSK = (1 << SWITCH_PCINT);
#endif
// set bits 1:0 to 0b01 (interrupt on rising *and* falling edge) (default)
// MCUCR &= 0b11111101; MCUCR |= 0b00000001;
#elif (ATTINY == 1634)
// enable pin change interrupt
#ifdef SWITCH2_PCIE
GIMSK |= ((1 << SWITCH_PCIE) | (1 << SWITCH2_PCIE));
#else
GIMSK |= (1 << SWITCH_PCIE);
#endif
#else
#error Unrecognized MCU type
#endif
}
inline void PCINT_off() {
#if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85)
// disable all pin-change interrupts
GIMSK &= ~(1 << PCIE);
#elif (ATTINY == 1634)
// disable all pin-change interrupts
GIMSK &= ~(1 << SWITCH_PCIE);
#else
#error Unrecognized MCU type
#endif
}
//void button_change_interrupt() {
#if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85) || (ATTINY == 1634)
//EMPTY_INTERRUPT(PCINT0_vect);
#ifdef PCINT_vect
ISR(PCINT_vect) {
#else
ISR(PCINT0_vect) {
#endif
irq_pcint = 1;
}
#else
#error Unrecognized MCU type
#endif
/*
ISR(PCINT0_vect) {
//DEBUG_FLASH;
// as it turns out, it's more reliable to detect pin changes from WDT
// because PCINT itself tends to double-tap when connected to a
// noisy / bouncy switch (so the content of this function has been
// moved to a separate function, called from WDT only)
// PCINT_inner(button_is_pressed());
}
*/
// should only be called from PCINT and/or WDT
// (is a separate function to reduce code duplication)
void PCINT_inner(uint8_t pressed) {
uint8_t pushed;
if (pressed) {
pushed = push_event(B_PRESS);
} else {
pushed = push_event(B_RELEASE);
}
// send event to the current state callback
if (pushed) {
button_last_state = pressed;
emit_current_event(0);
}
}
#endif
|