308 lines
13 KiB
C
308 lines
13 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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* SPDX-FileCopyrightText: 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 "shared/runtime/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/pwmio/PWMOut.h"
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#include "shared-bindings/util.h"
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void common_hal_pwmio_pwmout_raise_error(pwmout_result_t result) {
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switch (result) {
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case PWMOUT_OK:
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break;
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case PWMOUT_INVALID_PIN:
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raise_ValueError_invalid_pin();
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break;
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case PWMOUT_INVALID_FREQUENCY:
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mp_arg_error_invalid(MP_QSTR_frequency);
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break;
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case PWMOUT_INVALID_FREQUENCY_ON_PIN:
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mp_raise_ValueError(translate("Frequency must match existing PWMOut using this timer"));
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break;
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case PWMOUT_VARIABLE_FREQUENCY_NOT_AVAILABLE:
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mp_raise_ValueError(translate("Cannot vary frequency on a timer that is already in use"));
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break;
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case PWMOUT_ALL_TIMERS_ON_PIN_IN_USE:
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mp_raise_ValueError(translate("All timers for this pin are in use"));
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break;
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case PWMOUT_ALL_TIMERS_IN_USE:
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mp_raise_RuntimeError(translate("All timers in use"));
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break;
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case PWMOUT_ALL_CHANNELS_IN_USE:
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mp_raise_RuntimeError(translate("All channels in use"));
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break;
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default:
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case PWMOUT_INITIALIZATION_ERROR:
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mp_raise_RuntimeError(translate("Could not start PWM"));
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break;
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}
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}
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//| class PWMOut:
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//| """Output a Pulse Width Modulated signal on a given pin.
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//|
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//| .. note:: The exact frequencies possible depend on the specific microcontroller.
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//| If the requested frequency is within the available range, one of the two
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//| nearest possible frequencies to the requested one is selected.
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//|
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//| If the requested frequency is outside the range, either (A) a ValueError
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//| may be raised or (B) the highest or lowest frequency is selected. This
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//| behavior is microcontroller-dependent, and may depend on whether it's the
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//| upper or lower bound that is exceeded.
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//|
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//| In any case, the actual frequency (rounded to 1Hz) is available in the
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//| ``frequency`` property after construction.
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//|
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//| .. note:: The frequency is calculated based on a nominal CPU frequency.
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//| However, depending on the board, the error between the nominal and
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//| actual CPU frequency can be large (several hundred PPM in the case of
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//| crystal oscillators and up to ten percent in the case of RC
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//| oscillators)
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//|
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//| """
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//|
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//| def __init__(
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//| self,
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//| pin: microcontroller.Pin,
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//| *,
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//| duty_cycle: int = 0,
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//| frequency: int = 500,
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//| variable_frequency: bool = False
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//| ) -> None:
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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_cycle: 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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//|
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//| Simple LED on::
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//|
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//| import pwmio
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//| import board
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//|
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//| pwm = pwmio.PWMOut(board.LED)
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//|
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//| while True:
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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 LED fade::
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//|
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//| import pwmio
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//| import board
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//|
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//| pwm = pwmio.PWMOut(board.LED) # output on LED pin with default of 500Hz
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//|
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//| while True:
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//| for cycle in range(0, 65535): # Cycles through the full PWM range from 0 to 65535
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//| pwm.duty_cycle = cycle # Cycles the LED pin duty cycle through the range of values
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//| for cycle in range(65534, 0, -1): # Cycles through the PWM range backwards from 65534 to 0
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//| pwm.duty_cycle = cycle # Cycles the LED pin duty cycle through the range of values
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//|
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//| PWM at specific frequency (servos and motors)::
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//|
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//| import pwmio
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//| import board
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//|
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//| pwm = pwmio.PWMOut(board.D13, frequency=50)
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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 pwmio
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//| import board
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//| import time
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//|
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//| pwm = pwmio.PWMOut(board.D13, duty_cycle=2 ** 15, frequency=440, variable_frequency=True)
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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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//| """
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//| ...
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STATIC mp_obj_t pwmio_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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enum { ARG_pin, ARG_duty_cycle, ARG_frequency, ARG_variable_frequency };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ, },
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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_kw_array(n_args, n_kw, args, MP_ARRAY_SIZE(allowed_args), allowed_args, parsed_args);
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const mcu_pin_obj_t *pin = validate_obj_is_free_pin(parsed_args[ARG_pin].u_obj, MP_QSTR_pin);
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uint16_t duty_cycle = parsed_args[ARG_duty_cycle].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_bool;
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// create PWM object from the given pin
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pwmio_pwmout_obj_t *self = mp_obj_malloc(pwmio_pwmout_obj_t, &pwmio_pwmout_type);
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pwmout_result_t result = common_hal_pwmio_pwmout_construct(self, pin, duty_cycle, frequency, variable_frequency);
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common_hal_pwmio_pwmout_raise_error(result);
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return MP_OBJ_FROM_PTR(self);
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}
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//| def deinit(self) -> None:
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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 pwmio_pwmout_deinit(mp_obj_t self_in) {
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pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_pwmio_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(pwmio_pwmout_deinit_obj, pwmio_pwmout_deinit);
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STATIC void check_for_deinit(pwmio_pwmout_obj_t *self) {
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if (common_hal_pwmio_pwmout_deinited(self)) {
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raise_deinited_error();
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}
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}
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//| def __enter__(self) -> PWMOut:
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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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//| def __exit__(self) -> None:
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//| """Automatically deinitializes the hardware when exiting a context. See
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//| :ref:`lifetime-and-contextmanagers` for more info."""
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//| ...
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STATIC mp_obj_t pwmio_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_pwmio_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(pwmio_pwmout___exit___obj, 4, 4, pwmio_pwmout_obj___exit__);
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//| duty_cycle: int
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//| """16 bit value that dictates how much of one cycle is high (1) versus low
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//| (0). 0xffff will always be high, 0 will always be low and 0x7fff will
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//| be half high and then half low.
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//|
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//| Depending on how PWM is implemented on a specific board, the internal
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//| representation for duty cycle might have less than 16 bits of resolution.
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//| Reading this property will return the value from the internal representation,
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//| so it may differ from the value set."""
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STATIC mp_obj_t pwmio_pwmout_obj_get_duty_cycle(mp_obj_t self_in) {
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pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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check_for_deinit(self);
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return MP_OBJ_NEW_SMALL_INT(common_hal_pwmio_pwmout_get_duty_cycle(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(pwmio_pwmout_get_duty_cycle_obj, pwmio_pwmout_obj_get_duty_cycle);
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STATIC mp_obj_t pwmio_pwmout_obj_set_duty_cycle(mp_obj_t self_in, mp_obj_t duty_cycle) {
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pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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check_for_deinit(self);
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mp_int_t duty = mp_obj_get_int(duty_cycle);
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mp_arg_validate_int_range(duty, 0, 0xffff, MP_QSTR_duty_cycle);
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common_hal_pwmio_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(pwmio_pwmout_set_duty_cycle_obj, pwmio_pwmout_obj_set_duty_cycle);
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MP_PROPERTY_GETSET(pwmio_pwmout_duty_cycle_obj,
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(mp_obj_t)&pwmio_pwmout_get_duty_cycle_obj,
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(mp_obj_t)&pwmio_pwmout_set_duty_cycle_obj);
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//| frequency: int
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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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//| Depending on how PWM is implemented on a specific board, the internal value
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//| for the PWM's duty cycle may need to be recalculated when the frequency
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//| changes. In these cases, the duty cycle is automatically recalculated
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//| from the original duty cycle value. This should happen without any need
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//| to manually re-set the duty cycle. However, an output glitch may occur during the adjustment.
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//| """
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//|
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STATIC mp_obj_t pwmio_pwmout_obj_get_frequency(mp_obj_t self_in) {
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pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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check_for_deinit(self);
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return MP_OBJ_NEW_SMALL_INT(common_hal_pwmio_pwmout_get_frequency(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(pwmio_pwmout_get_frequency_obj, pwmio_pwmout_obj_get_frequency);
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STATIC mp_obj_t pwmio_pwmout_obj_set_frequency(mp_obj_t self_in, mp_obj_t frequency) {
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pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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check_for_deinit(self);
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if (!common_hal_pwmio_pwmout_get_variable_frequency(self)) {
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mp_raise_AttributeError(translate(
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"PWM frequency not writable when variable_frequency is False on construction."));
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}
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mp_int_t freq = mp_obj_get_int(frequency);
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if (freq == 0) {
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mp_arg_error_invalid(MP_QSTR_frequency);
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}
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common_hal_pwmio_pwmout_set_frequency(self, freq);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(pwmio_pwmout_set_frequency_obj, pwmio_pwmout_obj_set_frequency);
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MP_PROPERTY_GETSET(pwmio_pwmout_frequency_obj,
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(mp_obj_t)&pwmio_pwmout_get_frequency_obj,
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(mp_obj_t)&pwmio_pwmout_set_frequency_obj);
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STATIC const mp_rom_map_elem_t pwmio_pwmout_locals_dict_table[] = {
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// Methods
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pwmio_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(&pwmio_pwmout___exit___obj) },
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// Properties
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{ MP_ROM_QSTR(MP_QSTR_duty_cycle), MP_ROM_PTR(&pwmio_pwmout_duty_cycle_obj) },
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{ MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&pwmio_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(pwmio_pwmout_locals_dict, pwmio_pwmout_locals_dict_table);
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MP_DEFINE_CONST_OBJ_TYPE(
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pwmio_pwmout_type,
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MP_QSTR_PWMOut,
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MP_TYPE_FLAG_HAS_SPECIAL_ACCESSORS,
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make_new, pwmio_pwmout_make_new,
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locals_dict, &pwmio_pwmout_locals_dict
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);
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