circuitpython/shared-bindings/touchio/TouchIn.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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 <stdint.h>
#include <string.h>
#include "lib/utils/context_manager_helpers.h"
#include "py/binary.h"
#include "py/mphal.h"
#include "py/nlr.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/touchio/TouchIn.h"
#include "shared-bindings/util.h"
//| .. currentmodule:: touchio
//|
//| :class:`TouchIn` -- Read the state of a capacitive touch sensor
//| ===================================================================
//|
//| Usage::
//|
//| import touchio
//| from board import *
//|
//| touch = touchio.TouchIn(A1)
//| while True:
//| if touch.value:
//| print("touched!")
//|
//| .. class:: TouchIn(pin)
//|
//| Use the TouchIn on the given pin.
//|
//| :param ~microcontroller.Pin pin: the pin to read from
//|
STATIC mp_obj_t touchio_touchin_make_new(const mp_obj_type_t *type,
mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
// check number of arguments
mp_arg_check_num(n_args, n_kw, 1, 1, false);
// 1st argument is the pin
mp_obj_t pin_obj = args[0];
assert_pin(pin_obj, false);
touchio_touchin_obj_t *self = m_new_obj(touchio_touchin_obj_t);
self->base.type = &touchio_touchin_type;
const mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(pin_obj);
common_hal_touchio_touchin_construct(self, pin);
return (mp_obj_t) self;
}
//| .. method:: deinit()
//|
//| Deinitialises the TouchIn and releases any hardware resources for reuse.
//|
STATIC mp_obj_t touchio_touchin_deinit(mp_obj_t self_in) {
touchio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
common_hal_touchio_touchin_deinit(self);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(touchio_touchin_deinit_obj, touchio_touchin_deinit);
//| .. method:: __enter__()
//|
//| No-op used by Context Managers.
//|
// Provided by context manager helper.
//| .. method:: __exit__()
//|
//| Automatically deinitializes the hardware when exiting a context. See
//| :ref:`lifetime-and-contextmanagers` for more info.
//|
STATIC mp_obj_t touchio_touchin_obj___exit__(size_t n_args, const mp_obj_t *args) {
(void)n_args;
common_hal_touchio_touchin_deinit(args[0]);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(touchio_touchin___exit___obj, 4, 4, touchio_touchin_obj___exit__);
//| .. attribute:: value
//|
//| Whether the touch pad is being touched or not. (read-only)
//|
//| True when `raw_value` > `threshold`.
//|
STATIC mp_obj_t touchio_touchin_obj_get_value(mp_obj_t self_in) {
touchio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
raise_error_if_deinited(common_hal_touchio_touchin_deinited(self));
return mp_obj_new_bool(common_hal_touchio_touchin_get_value(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(touchio_touchin_get_value_obj, touchio_touchin_obj_get_value);
const mp_obj_property_t touchio_touchin_value_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&touchio_touchin_get_value_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj},
};
//| .. attribute:: raw_value
//|
//| The raw touch measurement as an `int`. (read-only)
//|
STATIC mp_obj_t touchio_touchin_obj_get_raw_value(mp_obj_t self_in) {
touchio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
raise_error_if_deinited(common_hal_touchio_touchin_deinited(self));
return MP_OBJ_NEW_SMALL_INT(common_hal_touchio_touchin_get_raw_value(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(touchio_touchin_get_raw_value_obj, touchio_touchin_obj_get_raw_value);
const mp_obj_property_t touchio_touchin_raw_value_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&touchio_touchin_get_raw_value_obj,
(mp_obj_t)&mp_const_none_obj,
(mp_obj_t)&mp_const_none_obj},
};
//| .. attribute:: threshold
//|
//| Minimum `raw_value` needed to detect a touch (and for `value` to be `True`).
//|
//| When the **TouchIn** object is created, an initial `raw_value` is read from the pin,
//| and then `threshold` is set to be 100 + that value.
//|
//| You can adjust `threshold` to make the pin more or less sensitive.
//|
STATIC mp_obj_t touchio_touchin_obj_get_threshold(mp_obj_t self_in) {
touchio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
raise_error_if_deinited(common_hal_touchio_touchin_deinited(self));
return MP_OBJ_NEW_SMALL_INT(common_hal_touchio_touchin_get_threshold(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(touchio_touchin_get_threshold_obj, touchio_touchin_obj_get_threshold);
STATIC mp_obj_t touchio_touchin_obj_set_threshold(mp_obj_t self_in, mp_obj_t threshold_obj) {
touchio_touchin_obj_t *self = MP_OBJ_TO_PTR(self_in);
raise_error_if_deinited(common_hal_touchio_touchin_deinited(self));
uint32_t new_threshold = mp_obj_get_int(threshold_obj);
if (new_threshold < 0 || new_threshold > UINT16_MAX) {
// I would use MP_STRINGIFY(UINT16_MAX), but that prints "0xffff" instead of 65536.
mp_raise_ValueError("threshold must be in the range 0-65536");
}
common_hal_touchio_touchin_set_threshold(self, new_threshold);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(touchio_touchin_set_threshold_obj, touchio_touchin_obj_set_threshold);
const mp_obj_property_t touchio_touchin_threshold_obj = {
.base.type = &mp_type_property,
.proxy = {(mp_obj_t)&touchio_touchin_get_threshold_obj,
(mp_obj_t)&touchio_touchin_set_threshold_obj,
(mp_obj_t)&mp_const_none_obj},
};
STATIC const mp_rom_map_elem_t touchio_touchin_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&touchio_touchin___exit___obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&touchio_touchin_deinit_obj) },
{ MP_OBJ_NEW_QSTR(MP_QSTR_value), MP_ROM_PTR(&touchio_touchin_value_obj)},
{ MP_OBJ_NEW_QSTR(MP_QSTR_raw_value), MP_ROM_PTR(&touchio_touchin_raw_value_obj)},
{ MP_OBJ_NEW_QSTR(MP_QSTR_threshold), MP_ROM_PTR(&touchio_touchin_threshold_obj)},
};
STATIC MP_DEFINE_CONST_DICT(touchio_touchin_locals_dict, touchio_touchin_locals_dict_table);
const mp_obj_type_t touchio_touchin_type = {
{ &mp_type_type },
.name = MP_QSTR_TouchIn,
.make_new = touchio_touchin_make_new,
.locals_dict = (mp_obj_t)&touchio_touchin_locals_dict,
};