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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2020 microDev
*
* 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.
*/
#include "shared-bindings/touchio/TouchIn.h"
#include "py/runtime.h"
#include "peripherals/touch.h"
static uint16_t get_raw_reading(touchio_touchin_obj_t *self) {
uint32_t touch_value;
touch_pad_read_raw_data(self->pin->touch_channel, &touch_value);
if (touch_value > UINT16_MAX) {
return UINT16_MAX;
}
return touch_value;
}
void common_hal_touchio_touchin_construct(touchio_touchin_obj_t* self,
const mcu_pin_obj_t *pin) {
if (pin->touch_channel == TOUCH_PAD_MAX) {
mp_raise_ValueError(translate("Invalid pin"));
}
claim_pin(pin);
// initialize touchpad
peripherals_touch_init(pin->touch_channel);
// wait for touch data to reset
mp_hal_delay_ms(10);
// Set a "touched" threshold not too far above the initial value.
// For simple finger touch, the values may vary as much as a factor of two,
// but for touches using fruit or other objects, the difference is much less.
self->pin = pin;
self->threshold = get_raw_reading(self) + 100;
}
bool common_hal_touchio_touchin_deinited(touchio_touchin_obj_t* self) {
return self->pin == NULL;
}
void common_hal_touchio_touchin_deinit(touchio_touchin_obj_t* self) {
if (common_hal_touchio_touchin_deinited(self)) {
return;
}
reset_pin_number(self->pin->touch_channel);
self->pin = NULL;
}
bool common_hal_touchio_touchin_get_value(touchio_touchin_obj_t *self) {
return get_raw_reading(self) > self->threshold;
}
uint16_t common_hal_touchio_touchin_get_raw_value(touchio_touchin_obj_t *self) {
return get_raw_reading(self);
}
uint16_t common_hal_touchio_touchin_get_threshold(touchio_touchin_obj_t *self) {
return self->threshold;
}
void common_hal_touchio_touchin_set_threshold(touchio_touchin_obj_t *self, uint16_t new_threshold) {
self->threshold = new_threshold;
}
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