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