85 lines
2.7 KiB
C
85 lines
2.7 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) 2017 Scott Shawcroft for Adafruit Industries
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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 <stdint.h>
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#include "samd/timers.h"
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#include "shared_timers.h"
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static uint8_t never_reset_tc_or_tcc[TC_INST_NUM + TCC_INST_NUM];
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static void timer_refcount(int index, bool is_tc, int increment) {
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if (is_tc) {
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never_reset_tc_or_tcc[index] += increment;
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} else {
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never_reset_tc_or_tcc[TC_INST_NUM + index] += increment;
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}
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}
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void timer_never_reset(int index, bool is_tc) {
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timer_refcount(index, is_tc, 1);
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}
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void timer_reset_ok(int index, bool is_tc) {
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timer_refcount(index, is_tc, -1);
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}
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bool timer_ok_to_reset(int index, bool is_tc) {
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if (is_tc) {
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return never_reset_tc_or_tcc[index] == 0;
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}
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return never_reset_tc_or_tcc[TC_INST_NUM + index] == 0;
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}
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void reset_timers(void) {
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// Reset all timers
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Tcc *tccs[TCC_INST_NUM] = TCC_INSTS;
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for (int i = 0; i < TCC_INST_NUM; i++) {
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if (!timer_ok_to_reset(i, false)) {
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continue;
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}
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// Disable the module before resetting it.
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if (tccs[i]->CTRLA.bit.ENABLE == 1) {
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tccs[i]->CTRLA.bit.ENABLE = 0;
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while (tccs[i]->SYNCBUSY.bit.ENABLE == 1) {
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}
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}
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tccs[i]->CTRLA.bit.SWRST = 1;
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while (tccs[i]->CTRLA.bit.SWRST == 1) {
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}
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}
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Tc *tcs[TC_INST_NUM] = TC_INSTS;
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for (int i = 0; i < TC_INST_NUM; i++) {
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if (!timer_ok_to_reset(i, true)) {
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continue;
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}
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tcs[i]->COUNT16.CTRLA.bit.SWRST = 1;
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while (tcs[i]->COUNT16.CTRLA.bit.SWRST == 1) {
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}
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}
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}
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