circuitpython/ports/espressif/peripherals/rmt.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 Lucian Copeland for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
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#include "peripherals/rmt.h"
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#include "py/runtime.h"
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++) {
if (rmt_reserved_channels[i]) {
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peripherals_free_rmt(i);
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}
}
}
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rmt_channel_t peripherals_find_and_reserve_rmt(bool mode) {
size_t start_channel = 0;
size_t end_channel = RMT_CHANNEL_MAX;
// ESP32C3 can only send on channels 0-1 and receive on channels 2-3
#if defined(CONFIG_IDF_TARGET_ESP32C3)
if (mode == RECEIVE_MODE) {
start_channel = 2;
} else {
end_channel = 2;
}
#endif // ESP32C3
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#if SOC_RMT_CHANNELS_PER_GROUP > 4
if (mode == RECEIVE_MODE) {
start_channel = 4;
} else {
end_channel = 4;
}
#endif
for (size_t i = start_channel; i < end_channel; i++) {
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if (!rmt_reserved_channels[i]) {
rmt_reserved_channels[i] = true;
return i;
}
}
// Returning the max indicates a reservation failure.
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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}