222 lines
9.1 KiB
C
222 lines
9.1 KiB
C
/*
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* This file is part of the Micro Python 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) 2016 Damien P. George
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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 <stdint.h>
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#include "lib/utils/context_manager_helpers.h"
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#include "py/objproperty.h"
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#include "py/runtime.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/nativeio/PWMOut.h"
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//| .. currentmodule:: nativeio
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//|
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//| :class:`PWMOut` -- Output a Pulse Width Modulated signal
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//| ========================================================
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//|
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//| PWMOut can be used to output a PWM signal on a given pin.
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//|
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//| .. class:: PWMOut(pin, duty_cycle=0, frequency=500, variable_frequency=False)
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//|
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//| Create a PWM object associated with the given pin. This allows you to
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//| write PWM signals out on the given pin. Frequency is fixed after init
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//| unless `variable_frequency` is True.
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//|
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//| .. note:: When ``variable_frequency`` is True, further PWM outputs may be
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//| limited because it may take more internal resources to be flexible. So,
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//| when outputting both fixed and flexible frequency signals construct the
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//| fixed outputs first.
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//|
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//| :param ~microcontroller.Pin pin: The pin to output to
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//| :param int duty: The fraction of each pulse which is high. 16-bit
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//| :param int frequency: The target frequency in Hertz (32-bit)
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//| :param bool variable_frequency: True if the frequency will change over time
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//|
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//| Simple LED fade::
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//|
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//| import nativeio
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//| import board
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//|
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//| with nativeio.PWMOut(board.D13) as pwm: # output on D13
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//| pwm.duty_cycle = 2 ** 15 # Cycles the pin with 50% duty cycle (half of 2 ** 16) at the default 500hz
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//|
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//| PWM at specific frequency (servos and motors)::
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//|
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//| import nativeio
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//| import board
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//|
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//| with nativeio.PWMOut(board.D13, frequency=50) as pwm:
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//| pwm.duty_cycle = 2 ** 15 # Cycles the pin with 50% duty cycle (half of 2 ** 16) at 50hz
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//|
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//| Variable frequency (usually tones)::
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//|
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//| import nativeio
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//| import board
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//| import time
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//|
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//| with nativeio.PWMOut(board.D13, duty_cycle=2 ** 15, frequency=440, variable_frequency=True) as pwm:
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//| time.sleep(0.2)
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//| pwm.frequency = 880
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//| time.sleep(0.1)
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//|
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STATIC mp_obj_t nativeio_pwmout_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
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mp_obj_t pin_obj = args[0];
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assert_pin(pin_obj, false);
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const mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(pin_obj);
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assert_pin_free(pin);
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// create PWM object from the given pin
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nativeio_pwmout_obj_t *self = m_new_obj(nativeio_pwmout_obj_t);
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self->base.type = &nativeio_pwmout_type;
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
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enum { ARG_duty, ARG_frequency, ARG_variable_frequency };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_duty_cycle, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_frequency, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 500} },
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{ MP_QSTR_variable_frequency, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
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};
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mp_arg_val_t parsed_args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, args + 1, &kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, parsed_args);
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uint8_t duty = parsed_args[ARG_duty].u_int;
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uint32_t frequency = parsed_args[ARG_frequency].u_int;
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bool variable_frequency = parsed_args[ARG_variable_frequency].u_int;
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common_hal_nativeio_pwmout_construct(self, pin, duty, frequency, variable_frequency);
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return MP_OBJ_FROM_PTR(self);
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}
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//| .. method:: deinit()
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//|
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//| Deinitialises the PWMOut and releases any hardware resources for reuse.
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//|
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STATIC mp_obj_t nativeio_pwmout_deinit(mp_obj_t self_in) {
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nativeio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_nativeio_pwmout_deinit(self);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(nativeio_pwmout_deinit_obj, nativeio_pwmout_deinit);
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//| .. method:: __enter__()
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//|
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//| No-op used by Context Managers.
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//|
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// Provided by context manager helper.
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//| .. method:: __exit__()
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//|
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//| Automatically deinitializes the hardware when exiting a context.
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//|
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STATIC mp_obj_t nativeio_pwmout_obj___exit__(size_t n_args, const mp_obj_t *args) {
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(void)n_args;
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common_hal_nativeio_pwmout_deinit(args[0]);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(nativeio_pwmout___exit___obj, 4, 4, nativeio_pwmout_obj___exit__);
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//| .. attribute:: duty_cycle
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//|
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//| 16 bit value that dictates how much of one cycle is high (1) versus low
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//| (0). 255 will always be high, 0 will always be low and 127 will be half
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//| high and then half low.
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STATIC mp_obj_t nativeio_pwmout_obj_get_duty_cycle(mp_obj_t self_in) {
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nativeio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return MP_OBJ_NEW_SMALL_INT(common_hal_nativeio_pwmout_get_duty_cycle(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(nativeio_pwmout_get_duty_cycle_obj, nativeio_pwmout_obj_get_duty_cycle);
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STATIC mp_obj_t nativeio_pwmout_obj_set_duty_cycle(mp_obj_t self_in, mp_obj_t duty_cycle) {
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nativeio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_int_t duty = mp_obj_get_int(duty_cycle);
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if (duty < 0 || duty > 0xffff) {
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mp_raise_ValueError("PWM duty must be between 0 and 65536 (16 bit resolution)");
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}
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common_hal_nativeio_pwmout_set_duty_cycle(self, duty);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(nativeio_pwmout_set_duty_cycle_obj, nativeio_pwmout_obj_set_duty_cycle);
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const mp_obj_property_t nativeio_pwmout_duty_cycle_obj = {
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.base.type = &mp_type_property,
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.proxy = {(mp_obj_t)&nativeio_pwmout_get_duty_cycle_obj,
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(mp_obj_t)&nativeio_pwmout_set_duty_cycle_obj,
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(mp_obj_t)&mp_const_none_obj},
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};
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//| .. attribute:: frequency
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//|
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//| 32 bit value that dictates the PWM frequency in Hertz (cycles per
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//| second). Only writeable when constructed with ``variable_frequency=True``.
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//|
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STATIC mp_obj_t nativeio_pwmout_obj_get_frequency(mp_obj_t self_in) {
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nativeio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return MP_OBJ_NEW_SMALL_INT(common_hal_nativeio_pwmout_get_frequency(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(nativeio_pwmout_get_frequency_obj, nativeio_pwmout_obj_get_frequency);
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STATIC mp_obj_t nativeio_pwmout_obj_set_frequency(mp_obj_t self_in, mp_obj_t frequency) {
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nativeio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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if (!common_hal_nativeio_pwmout_get_variable_frequency(self)) {
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mp_raise_AttributeError(
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"PWM frequency not writeable when variable_frequency is False on "
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"construction.");
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}
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common_hal_nativeio_pwmout_set_frequency(self, mp_obj_get_int(frequency));
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(nativeio_pwmout_set_frequency_obj, nativeio_pwmout_obj_set_frequency);
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const mp_obj_property_t nativeio_pwmout_frequency_obj = {
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.base.type = &mp_type_property,
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.proxy = {(mp_obj_t)&nativeio_pwmout_get_frequency_obj,
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(mp_obj_t)&nativeio_pwmout_set_frequency_obj,
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(mp_obj_t)&mp_const_none_obj},
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};
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STATIC const mp_rom_map_elem_t nativeio_pwmout_locals_dict_table[] = {
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// Methods
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&nativeio_pwmout_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&nativeio_pwmout___exit___obj) },
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// Properties
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{ MP_ROM_QSTR(MP_QSTR_duty_cycle), MP_ROM_PTR(&nativeio_pwmout_duty_cycle_obj) },
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{ MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&nativeio_pwmout_frequency_obj) },
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// TODO(tannewt): Add enabled to determine whether the signal is output
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// without giving up the resources. Useful for IR output.
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};
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STATIC MP_DEFINE_CONST_DICT(nativeio_pwmout_locals_dict, nativeio_pwmout_locals_dict_table);
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const mp_obj_type_t nativeio_pwmout_type = {
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{ &mp_type_type },
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.name = MP_QSTR_PWMOut,
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.make_new = nativeio_pwmout_make_new,
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.locals_dict = (mp_obj_dict_t*)&nativeio_pwmout_locals_dict,
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};
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