circuitpython/ports/esp32s2/common-hal/countio/Counter.c

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/*
* 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.
*/
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#include "common-hal/countio/Counter.h"
#include "common-hal/microcontroller/Pin.h"
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void common_hal_countio_counter_construct(countio_counter_obj_t* self,
const mcu_pin_obj_t* pin) {
claim_pin(pin);
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// Prepare configuration for the PCNT unit
pcnt_config_t pcnt_config = {
// Set PCNT input signal and control GPIOs
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.pulse_gpio_num = pin->number,
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.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
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// This also sets pcnt_config.unit
peripherals_pcnt_init(&pcnt_config);
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self->pin = pin->number;
self->unit = pcnt_config.unit;
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}
bool common_hal_countio_counter_deinited(countio_counter_obj_t* self) {
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return self->unit == PCNT_UNIT_MAX;
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}
void common_hal_countio_counter_deinit(countio_counter_obj_t* self) {
if (common_hal_countio_counter_deinited(self)) {
return;
}
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reset_pin_number(self->pin);
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peripherals_pcnt_deinit(&self->unit);
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}
mp_int_t common_hal_countio_counter_get_count(countio_counter_obj_t* self) {
int16_t count;
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pcnt_get_counter_value(self->unit, &count);
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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;
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pcnt_counter_clear(self->unit);
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}
void common_hal_countio_counter_reset(countio_counter_obj_t* self) {
common_hal_countio_counter_set_count(self, 0);
}