97 lines
3.3 KiB
C
97 lines
3.3 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 "shared-bindings/touchio/TouchIn.h"
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#include "py/runtime.h"
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#include "driver/touch_pad.h"
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static uint16_t get_raw_reading(touchio_touchin_obj_t *self) {
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uint32_t touch_value;
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touch_pad_read_raw_data((touch_pad_t)self->pin->touch_channel, &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 touch_value;
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}
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void common_hal_touchio_touchin_construct(touchio_touchin_obj_t* self,
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const mcu_pin_obj_t *pin) {
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if (pin->touch_channel == TOUCH_PAD_MAX) {
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mp_raise_ValueError(translate("Invalid pin"));
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}
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claim_pin(pin);
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touch_pad_init();
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touch_pad_config((touch_pad_t)pin->touch_channel);
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touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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touch_pad_fsm_start();
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// wait for "raw data" to reset
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mp_hal_delay_ms(10);
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// Initial values for pins will vary, depending on what peripherals the pins
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// share on-chip.
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// Set a "touched" threshold not too far above the initial value.
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// For simple finger touch, the values may vary as much as a factor of two,
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// but for touches using fruit or other objects, the difference is much less.
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self->pin = pin;
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self->threshold = get_raw_reading(self) + 100;
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}
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bool common_hal_touchio_touchin_deinited(touchio_touchin_obj_t* self) {
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return self->pin == NULL;
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}
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void common_hal_touchio_touchin_deinit(touchio_touchin_obj_t* self) {
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if (common_hal_touchio_touchin_deinited(self)) {
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return;
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}
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touch_pad_deinit();
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reset_pin_number(self->pin->touch_channel);
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self->pin = NULL;
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}
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bool common_hal_touchio_touchin_get_value(touchio_touchin_obj_t *self) {
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uint16_t reading = get_raw_reading(self);
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return reading > self->threshold;
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}
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uint16_t common_hal_touchio_touchin_get_raw_value(touchio_touchin_obj_t *self) {
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return get_raw_reading(self);
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}
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uint16_t common_hal_touchio_touchin_get_threshold(touchio_touchin_obj_t *self) {
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return self->threshold;
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}
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void common_hal_touchio_touchin_set_threshold(touchio_touchin_obj_t *self, uint16_t new_threshold) {
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self->threshold = new_threshold;
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}
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