82 lines
2.6 KiB
C
82 lines
2.6 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 "peripherals/pcnt.h"
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#define PCNT_UNIT_ACTIVE 1
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#define PCNT_UNIT_INACTIVE 0
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static uint8_t pcnt_unit_state[PCNT_UNIT_MAX];
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void peripherals_pcnt_reset(void) {
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for (uint8_t i = 0; i < PCNT_UNIT_MAX; i++) {
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pcnt_unit_state[i] = PCNT_UNIT_INACTIVE;
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}
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}
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static int peripherals_pcnt_get_unit(pcnt_config_t *pcnt_config) {
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// Look for available pcnt unit
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for (uint8_t i = 0; i < PCNT_UNIT_MAX; i++) {
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if (pcnt_unit_state[i] == PCNT_UNIT_INACTIVE) {
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pcnt_config->unit = (pcnt_unit_t)i;
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pcnt_unit_state[i] = PCNT_UNIT_ACTIVE;
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return i;
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}
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}
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return -1;
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}
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void peripherals_pcnt_reinit(pcnt_config_t *pcnt_config) {
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// Reinitialize a pcnt unit that has already been allocated.
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// Initialize PCNT unit
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pcnt_unit_config(pcnt_config);
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// Initialize PCNT's counter
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pcnt_counter_pause(pcnt_config->unit);
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pcnt_counter_clear(pcnt_config->unit);
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// Everything is set up, now go to counting
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pcnt_counter_resume(pcnt_config->unit);
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}
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int peripherals_pcnt_init(pcnt_config_t *pcnt_config) {
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const int8_t unit = peripherals_pcnt_get_unit(pcnt_config);
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if (unit == -1) {
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return -1;
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}
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peripherals_pcnt_reinit(pcnt_config);
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return pcnt_config->unit;
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}
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void peripherals_pcnt_deinit(pcnt_unit_t *unit) {
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pcnt_unit_state[*unit] = PCNT_UNIT_INACTIVE;
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*unit = PCNT_UNIT_MAX;
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}
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