64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/*
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* This file is part of the Micro Python 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 Lucian Copeland 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 "peripherals/rmt.h"
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#include "py/runtime.h"
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bool rmt_reserved_channels[RMT_CHANNEL_MAX];
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void peripherals_rmt_reset(void) {
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for (size_t i = 0; i < RMT_CHANNEL_MAX; i++) {
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if (rmt_reserved_channels[i]) {
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peripherals_free_rmt(i);
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}
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}
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}
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rmt_channel_t peripherals_find_and_reserve_rmt(bool mode) {
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size_t start_channel = 0;
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size_t end_channel = RMT_CHANNEL_MAX;
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#if SOC_RMT_CHANNELS_PER_GROUP > 4
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if (mode == RECEIVE_MODE) {
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start_channel = 4;
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} else {
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end_channel = 4;
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}
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#endif
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for (size_t i = start_channel; i < end_channel; i++) {
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if (!rmt_reserved_channels[i]) {
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rmt_reserved_channels[i] = true;
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return i;
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}
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}
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// Returning the max indicates a reservation failure.
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return RMT_CHANNEL_MAX;
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}
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void peripherals_free_rmt(rmt_channel_t chan) {
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rmt_reserved_channels[chan] = false;
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rmt_driver_uninstall(chan);
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}
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