blob: a79572d353b5ece37b1d1980b62359a6c4092c0a (
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
|
/*
* fsm-pcint.c: PCINT (Pin Change Interrupt) functions for SpaghettiMonster.
*
* Copyright (C) 2017 Selene ToyKeeper
*
* 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() {
// remember the past 32 measurements
static uint32_t readings = 0;
// take at least one new measurement,
// and wait for measurements to settle to all zeroes or all ones
do {
// shift past readings and add current value
readings = (readings << 1) | ((PINB & (1<<SWITCH_PIN)) == 0);
// wait a moment
_delay_loop_2(BOGOMIPS/16); // up to 2ms to stabilize
}
while ((readings != 0) && (readings != 0xFFFFFFFF));
button_last_state = readings;
return readings;
}
inline void PCINT_on() {
// enable pin change interrupt for pin N
GIMSK |= (1 << PCIE);
// only pay attention to the e-switch pin
//PCMSK = (1 << SWITCH_PCINT);
// set bits 1:0 to 0b01 (interrupt on rising *and* falling edge) (default)
// MCUCR &= 0b11111101; MCUCR |= 0b00000001;
}
inline void PCINT_off() {
// disable all pin-change interrupts
GIMSK &= ~(1 << PCIE);
}
//void button_change_interrupt() {
EMPTY_INTERRUPT(PCINT0_vect);
/*
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(A_PRESS);
} else {
pushed = push_event(A_RELEASE);
}
// check if sequence matches any defined sequences
// if so, send event to current state callback
if (pushed) {
button_last_state = pressed;
emit_current_event(0);
}
}
#endif
|
