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
|
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 microDev
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "common-hal/countio/Counter.h"
#include "common-hal/microcontroller/Pin.h"
#include "py/runtime.h"
#include "supervisor/shared/translate.h"
void common_hal_countio_counter_construct(countio_counter_obj_t *self,
const mcu_pin_obj_t *pin) {
claim_pin(pin);
// Prepare configuration for the PCNT unit
const pcnt_config_t pcnt_config = {
// Set PCNT input signal and control GPIOs
.pulse_gpio_num = pin->number,
.ctrl_gpio_num = PCNT_PIN_NOT_USED,
.channel = PCNT_CHANNEL_0,
// What to do on the positive / negative edge of pulse input?
.pos_mode = PCNT_COUNT_INC, // Count up on the positive edge
.neg_mode = PCNT_COUNT_DIS, // Keep the counter value on the negative edge
};
// Initialize PCNT unit
const int8_t unit = peripherals_pcnt_init(pcnt_config);
if (unit == -1) {
mp_raise_RuntimeError(translate("All PCNT units in use"));
}
self->pin = pin->number;
self->unit = (pcnt_unit_t)unit;
}
bool common_hal_countio_counter_deinited(countio_counter_obj_t *self) {
return self->unit == PCNT_UNIT_MAX;
}
void common_hal_countio_counter_deinit(countio_counter_obj_t *self) {
if (common_hal_countio_counter_deinited(self)) {
return;
}
reset_pin_number(self->pin);
peripherals_pcnt_deinit(&self->unit);
}
mp_int_t common_hal_countio_counter_get_count(countio_counter_obj_t *self) {
int16_t count;
pcnt_get_counter_value(self->unit, &count);
return count + self->count;
}
void common_hal_countio_counter_set_count(countio_counter_obj_t *self,
mp_int_t new_count) {
self->count = new_count;
pcnt_counter_clear(self->unit);
}
void common_hal_countio_counter_reset(countio_counter_obj_t *self) {
common_hal_countio_counter_set_count(self, 0);
}
|
