/* * This file is part of the Micro Python project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries * * 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 #include "lib/utils/context_manager_helpers.h" #include "py/objproperty.h" #include "py/runtime.h" #include "py/runtime0.h" #include "shared-bindings/microcontroller/Pin.h" #include "shared-bindings/pulseio/PulseIn.h" //| .. currentmodule:: pulseio //| //| :class:`PulseIn` -- Read a series of pulse durations //| ======================================================== //| //| PulseIn is used to measure a series of active and idle pulses. This is //| commonly used in infrared receivers and low cost temperature sensors (DHT). //| The pulsed signal consists of timed active and idle periods. Unlike PWM, //| there is no set duration for active and idle pairs. //| //| .. class:: PulseIn(pin, maxlen=2, \*, idle_state=False) //| //| Create a PulseIn object associated with the given pin. The object acts as //| a read-only sequence of pulse lengths with a given max length. When it is //| active, new pulse lengths are added to the end of the list. When there is //| no more room (len() == `maxlen`) the oldest pulse length is removed to //| make room. //| //| :param ~microcontroller.Pin pin: Pin to read pulses from. //| :param int maxlen: Maximum number of pulse durations to store at once //| :param bool idle_state: Idle state of the pin. At start and after `resume` //| the first recorded pulse will the opposite state from idle. //| //| Read a short series of pulses:: //| //| import pulseio //| import board //| //| pulses = pulseio.PulseIn(board.D7) //| //| # Wait for an active pulse //| while len(pulses) == 0: //| pass //| # Pause while we do something with the pulses //| pulses.pause() //| //| # Print the pulses. pulses[0] is an active pulse unless the length //| # reached max length and idle pulses are recorded. //| print(pulses) //| //| # Clear the rest //| pulses.clear() //| //| # Resume with an 80 microsecond active pulse //| pulses.resume(80) //| STATIC mp_obj_t pulseio_pulsein_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *pos_args) { mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true); mp_map_t kw_args; mp_map_init_fixed_table(&kw_args, n_kw, pos_args + n_args); enum { ARG_pin, ARG_maxlen, ARG_idle_state }; static const mp_arg_t allowed_args[] = { { MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ }, { MP_QSTR_maxlen, MP_ARG_INT, {.u_int = 2} }, { MP_QSTR_idle_state, MP_ARG_BOOL, {.u_bool = false} }, }; mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; mp_arg_parse_all(n_args, pos_args, &kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); assert_pin(args[ARG_pin].u_obj, false); const mcu_pin_obj_t* pin = MP_OBJ_TO_PTR(args[ARG_pin].u_obj); assert_pin_free(pin); pulseio_pulsein_obj_t *self = m_new_obj(pulseio_pulsein_obj_t); self->base.type = &pulseio_pulsein_type; common_hal_pulseio_pulsein_construct(self, pin, args[ARG_maxlen].u_int, args[ARG_idle_state].u_bool); return MP_OBJ_FROM_PTR(self); } //| .. method:: deinit() //| //| Deinitialises the PulseIn and releases any hardware resources for reuse. //| STATIC mp_obj_t pulseio_pulsein_deinit(mp_obj_t self_in) { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); common_hal_pulseio_pulsein_deinit(self); return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_deinit_obj, pulseio_pulsein_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 pulseio_pulsein_obj___exit__(size_t n_args, const mp_obj_t *args) { (void)n_args; common_hal_pulseio_pulsein_deinit(args[0]); return mp_const_none; } STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pulseio_pulsein___exit___obj, 4, 4, pulseio_pulsein_obj___exit__); //| .. method:: pause() //| //| Pause pulse capture //| STATIC mp_obj_t pulseio_pulsein_obj_pause(mp_obj_t self_in) { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); common_hal_pulseio_pulsein_pause(self); return mp_const_none; } MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_pause_obj, pulseio_pulsein_obj_pause); //| .. method:: resume(trigger_duration=0) //| //| Resumes pulse capture after an optional trigger pulse. //| //| .. warning:: Using trigger pulse with a device that drives both high and //| low signals risks a short. Make sure your device is open drain (only //| drives low) when using a trigger pulse. You most likely added a //| "pull-up" resistor to your circuit to do this. //| //| :param int trigger_duration: trigger pulse duration in microseconds //| STATIC mp_obj_t pulseio_pulsein_obj_resume(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) { enum { ARG_trigger_duration }; static const mp_arg_t allowed_args[] = { { MP_QSTR_trigger_duration, MP_ARG_OBJ, {.u_int = 0} }, }; pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]); mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)]; mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args); common_hal_pulseio_pulsein_resume(self, args[ARG_trigger_duration].u_int); return mp_const_none; } MP_DEFINE_CONST_FUN_OBJ_KW(pulseio_pulsein_resume_obj, 1, pulseio_pulsein_obj_resume); //| .. method:: clear() //| //| Clears all captured pulses //| STATIC mp_obj_t pulseio_pulsein_obj_clear(mp_obj_t self_in) { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); common_hal_pulseio_pulsein_clear(self); return mp_const_none; } MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_clear_obj, pulseio_pulsein_obj_clear); //| .. method:: popleft() //| //| Removes and returns the oldest read pulse. //| STATIC mp_obj_t pulseio_pulsein_obj_popleft(mp_obj_t self_in) { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pulsein_popleft(self)); } MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_popleft_obj, pulseio_pulsein_obj_popleft); //| .. attribute:: maxlen //| //| Returns the maximum length of the PulseIn. When len() is equal to maxlen, //| it is unclear which pulses are active and which are idle. //| STATIC mp_obj_t pulseio_pulsein_obj_get_maxlen(mp_obj_t self_in) { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pulsein_get_maxlen(self)); } MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_get_maxlen_obj, pulseio_pulsein_obj_get_maxlen); const mp_obj_property_t pulseio_pulsein_maxlen_obj = { .base.type = &mp_type_property, .proxy = {(mp_obj_t)&pulseio_pulsein_get_maxlen_obj, (mp_obj_t)&mp_const_none_obj, (mp_obj_t)&mp_const_none_obj}, }; //| .. method:: __len__() //| //| Returns the current pulse length //| //| This allows you to:: //| //| pulses = pulseio.PulseIn(pin) //| print(len(pulses)) //| STATIC mp_obj_t pulsein_unary_op(mp_uint_t op, mp_obj_t self_in) { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); uint16_t len = common_hal_pulseio_pulsein_get_len(self); switch (op) { case MP_UNARY_OP_BOOL: return mp_obj_new_bool(len != 0); case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(len); default: return MP_OBJ_NULL; // op not supported } } //| .. method:: __get__(index) //| //| Returns the value at the given index or values in slice. //| //| This allows you to:: //| //| pulses = pulseio.PulseIn(pin) //| print(pulses[0]) //| STATIC mp_obj_t pulsein_subscr(mp_obj_t self_in, mp_obj_t index_obj, mp_obj_t value) { if (value == mp_const_none) { // delete item mp_raise_AttributeError("Cannot delete values"); } else { pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in); if (MP_OBJ_IS_TYPE(index_obj, &mp_type_slice)) { mp_raise_NotImplementedError("Slices not supported"); } else { uint16_t index = 0; if (MP_OBJ_IS_SMALL_INT(index_obj)) { index = MP_OBJ_SMALL_INT_VALUE(index_obj); } else { mp_raise_TypeError("index must be int"); } if (value == MP_OBJ_SENTINEL) { // load return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pulsein_get_item(self, index)); } else { mp_raise_AttributeError("Read-only"); } } } return mp_const_none; } STATIC const mp_rom_map_elem_t pulseio_pulsein_locals_dict_table[] = { // Methods { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pulseio_pulsein_deinit_obj) }, { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) }, { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&pulseio_pulsein___exit___obj) }, { MP_ROM_QSTR(MP_QSTR_pause), MP_ROM_PTR(&pulseio_pulsein_pause_obj) }, { MP_ROM_QSTR(MP_QSTR_resume), MP_ROM_PTR(&pulseio_pulsein_resume_obj) }, { MP_ROM_QSTR(MP_QSTR_clear), MP_ROM_PTR(&pulseio_pulsein_clear_obj) }, { MP_ROM_QSTR(MP_QSTR_popleft), MP_ROM_PTR(&pulseio_pulsein_popleft_obj) }, { MP_ROM_QSTR(MP_QSTR_maxlen), MP_ROM_PTR(&pulseio_pulsein_maxlen_obj) }, }; STATIC MP_DEFINE_CONST_DICT(pulseio_pulsein_locals_dict, pulseio_pulsein_locals_dict_table); const mp_obj_type_t pulseio_pulsein_type = { { &mp_type_type }, .name = MP_QSTR_PulseIn, .make_new = pulseio_pulsein_make_new, .subscr = pulsein_subscr, .unary_op = pulsein_unary_op, .locals_dict = (mp_obj_dict_t*)&pulseio_pulsein_locals_dict, };