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/*
* This file is part of the MicroPython 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 <stdio.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "extint.h"
#include "pin.h"
#include "usrsw.h"
#if MICROPY_HW_HAS_SWITCH
/// \moduleref pyb
/// \class Switch - switch object
///
/// A Switch object is used to control a push-button switch.
///
/// Usage:
///
/// sw = pyb.Switch() # create a switch object
/// sw() # get state (True if pressed, False otherwise)
/// sw.callback(f) # register a callback to be called when the
/// # switch is pressed down
/// sw.callback(None) # remove the callback
///
/// Example:
///
/// pyb.Switch().callback(lambda: pyb.LED(1).toggle())
// this function inits the switch GPIO so that it can be used
void switch_init0(void) {
mp_hal_pin_config(MICROPY_HW_USRSW_PIN, MP_HAL_PIN_MODE_INPUT, MICROPY_HW_USRSW_PULL, 0);
}
int switch_get(void) {
int val = ((MICROPY_HW_USRSW_PIN->gpio->IDR & MICROPY_HW_USRSW_PIN->pin_mask) != 0);
return val == MICROPY_HW_USRSW_PRESSED;
}
/******************************************************************************/
// MicroPython bindings
typedef struct _pyb_switch_obj_t {
mp_obj_base_t base;
} pyb_switch_obj_t;
STATIC const pyb_switch_obj_t pyb_switch_obj = {{&pyb_switch_type}};
void pyb_switch_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
mp_print_str(print, "Switch()");
}
/// \classmethod \constructor()
/// Create and return a switch object.
STATIC mp_obj_t pyb_switch_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check arguments
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// No need to clear the callback member: if it's already been set and registered
// with extint then we don't want to reset that behaviour. If it hasn't been set,
// then no extint will be called until it is set via the callback method.
// return static switch object
return MP_OBJ_FROM_PTR(&pyb_switch_obj);
}
/// \method \call()
/// Return the switch state: `True` if pressed down, `False` otherwise.
mp_obj_t pyb_switch_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// get switch state
mp_arg_check_num(n_args, n_kw, 0, 0, false);
return switch_get() ? mp_const_true : mp_const_false;
}
mp_obj_t pyb_switch_value(mp_obj_t self_in) {
(void)self_in;
return mp_obj_new_bool(switch_get());
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_switch_value_obj, pyb_switch_value);
STATIC mp_obj_t switch_callback(mp_obj_t line) {
if (MP_STATE_PORT(pyb_switch_callback) != mp_const_none) {
mp_call_function_0(MP_STATE_PORT(pyb_switch_callback));
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(switch_callback_obj, switch_callback);
/// \method callback(fun)
/// Register the given function to be called when the switch is pressed down.
/// If `fun` is `None`, then it disables the callback.
mp_obj_t pyb_switch_callback(mp_obj_t self_in, mp_obj_t callback) {
MP_STATE_PORT(pyb_switch_callback) = callback;
// Init the EXTI each time this function is called, since the EXTI
// may have been disabled by an exception in the interrupt, or the
// user disabling the line explicitly.
extint_register(MP_OBJ_FROM_PTR(MICROPY_HW_USRSW_PIN),
MICROPY_HW_USRSW_EXTI_MODE,
MICROPY_HW_USRSW_PULL,
callback == mp_const_none ? mp_const_none : MP_OBJ_FROM_PTR(&switch_callback_obj),
true);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(pyb_switch_callback_obj, pyb_switch_callback);
STATIC const mp_rom_map_elem_t pyb_switch_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_value), MP_ROM_PTR(&pyb_switch_value_obj) },
{ MP_ROM_QSTR(MP_QSTR_callback), MP_ROM_PTR(&pyb_switch_callback_obj) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_switch_locals_dict, pyb_switch_locals_dict_table);
const mp_obj_type_t pyb_switch_type = {
{ &mp_type_type },
.name = MP_QSTR_Switch,
.print = pyb_switch_print,
.make_new = pyb_switch_make_new,
.call = pyb_switch_call,
.locals_dict = (mp_obj_dict_t*)&pyb_switch_locals_dict,
};
#endif // MICROPY_HW_HAS_SWITCH
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