99 lines
3.2 KiB
C
99 lines
3.2 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/timer.h"
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#define TIMER_NEVER_RESET 2
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#define TIMER_FREE 1
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#define TIMER_BUSY 0
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static uint8_t timer_state[2][2];
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void peripherals_timer_reset(void) {
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timer_index_t timer;
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for (uint8_t i = 0; i < 2; i++) {
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for (uint8_t j = 0; j < 2; j++) {
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if (timer_state[i][j] == TIMER_BUSY) {
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timer.idx = (timer_idx_t)j;
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timer.group = (timer_group_t)i;
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timer_state[i][j] = TIMER_FREE;
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peripherals_timer_deinit(&timer);
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}
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}
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}
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}
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bool peripherals_timer_init(const timer_config_t *config, timer_index_t *timer) {
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bool break_loop = false;
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// get free timer
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for (uint8_t i = 0; i < 2; i++) {
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for (uint8_t j = 0; j < 2; j++) {
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if (timer_state[i][j] == TIMER_FREE) {
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timer->idx = (timer_idx_t)j;
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timer->group = (timer_group_t)i;
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timer_state[i][j] = TIMER_BUSY;
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break_loop = true;
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break;
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} else if (i == 1 && j == 1) {
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timer->idx = TIMER_MAX;
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timer->group = TIMER_GROUP_MAX;
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return false;
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}
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}
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if (break_loop) {
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break;
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}
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}
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timer->hw = (timer->group == 0) ? &TIMERG0 : &TIMERG1;
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// initialize timer module
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timer_init(timer->group, timer->idx, config);
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timer_set_counter_value(timer->group, timer->idx, 0);
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return true;
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}
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void peripherals_timer_deinit(timer_index_t *timer) {
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if (timer->group == TIMER_GROUP_MAX || timer->idx == TIMER_MAX) {
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return;
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}
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timer_deinit(timer->group, timer->idx);
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int i = timer->group;
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int j = timer->idx;
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timer->group = TIMER_GROUP_MAX;
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timer->idx = TIMER_MAX;
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timer_state[i][j] = TIMER_FREE;
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}
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void peripherals_timer_never_reset(timer_index_t *timer) {
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timer_deinit(timer->group, timer->idx);
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int i = timer->group;
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int j = timer->idx;
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timer_state[i][j] = TIMER_NEVER_RESET;
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}
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