79 lines
2.7 KiB
C
79 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) 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/touch.h"
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static bool touch_inited = false;
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static bool touch_never_reset = false;
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void peripherals_touch_reset(void) {
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if (touch_inited && !touch_never_reset) {
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touch_pad_deinit();
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touch_inited = false;
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}
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}
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void peripherals_touch_never_reset(const bool enable) {
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touch_never_reset = enable;
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}
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void peripherals_touch_init(const touch_pad_t touchpad) {
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if (!touch_inited) {
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touch_pad_init();
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touch_pad_set_fsm_mode(TOUCH_FSM_MODE_SW);
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}
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// touch_pad_config() must be done before touch_pad_fsm_start() the first time.
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// Otherwise the calibration is wrong and we get maximum raw values if there is
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// a trace of any significant length on the pin.
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#if defined(CONFIG_IDF_TARGET_ESP32)
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touch_pad_config(touchpad, 0);
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#else
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touch_pad_config(touchpad);
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touch_pad_fsm_start();
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#endif
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touch_inited = true;
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}
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uint16_t peripherals_touch_read(touch_pad_t touchpad) {
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#if defined(CONFIG_IDF_TARGET_ESP32)
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uint16_t touch_value;
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touch_pad_read(touchpad, &touch_value);
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// ESP32 touch_pad_read() returns a lower value when a pin is touched instead of a higher value.
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// Flip the values around to be consistent with TouchIn assumptions.
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return UINT16_MAX - touch_value;
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#else
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uint32_t touch_value;
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touch_pad_sw_start();
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while (!touch_pad_meas_is_done()) {
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}
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touch_pad_read_raw_data(touchpad, &touch_value);
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if (touch_value > UINT16_MAX) {
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return UINT16_MAX;
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}
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return (uint16_t)touch_value;
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#endif
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}
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