136 lines
4.6 KiB
C
136 lines
4.6 KiB
C
/*
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* This file is part of the MicroPython 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 "py/runtime.h"
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#include "modmachine.h"
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#include "esppwm.h"
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typedef struct _machine_pwm_obj_t {
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mp_obj_base_t base;
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pyb_pin_obj_t *pin;
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uint8_t active;
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uint8_t channel;
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} machine_pwm_obj_t;
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STATIC bool pwm_inited = false;
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/******************************************************************************/
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// MicroPython bindings for PWM
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STATIC void mp_machine_pwm_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_pwm_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "PWM(%u", self->pin->phys_port);
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if (self->active) {
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mp_printf(print, ", freq=%u, duty=%u",
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pwm_get_freq(self->channel), pwm_get_duty(self->channel));
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}
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mp_printf(print, ")");
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}
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STATIC void mp_machine_pwm_init_helper(machine_pwm_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_freq, ARG_duty };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_freq, MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_duty, MP_ARG_INT, {.u_int = -1} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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int channel = pwm_add(self->pin->phys_port, self->pin->periph, self->pin->func);
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if (channel == -1) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("PWM not supported on pin %d"), self->pin->phys_port);
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}
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self->channel = channel;
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self->active = 1;
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if (args[ARG_freq].u_int != -1) {
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pwm_set_freq(args[ARG_freq].u_int, self->channel);
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}
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if (args[ARG_duty].u_int != -1) {
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pwm_set_duty(args[ARG_duty].u_int, self->channel);
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}
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pwm_start();
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}
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STATIC mp_obj_t mp_machine_pwm_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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pyb_pin_obj_t *pin = mp_obj_get_pin_obj(args[0]);
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// create PWM object from the given pin
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machine_pwm_obj_t *self = m_new_obj(machine_pwm_obj_t);
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self->base.type = &machine_pwm_type;
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self->pin = pin;
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self->active = 0;
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self->channel = -1;
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// start the PWM subsystem if it's not already running
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if (!pwm_inited) {
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pwm_init();
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pwm_inited = true;
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}
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// start the PWM running for this channel
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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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mp_machine_pwm_init_helper(self, n_args - 1, args + 1, &kw_args);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC void mp_machine_pwm_deinit(machine_pwm_obj_t *self) {
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pwm_delete(self->channel);
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self->active = 0;
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pwm_start();
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}
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STATIC mp_obj_t mp_machine_pwm_freq_get(machine_pwm_obj_t *self) {
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return MP_OBJ_NEW_SMALL_INT(pwm_get_freq(0));
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}
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STATIC void mp_machine_pwm_freq_set(machine_pwm_obj_t *self, mp_int_t freq) {
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pwm_set_freq(freq, 0);
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pwm_start();
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}
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STATIC mp_obj_t mp_machine_pwm_duty_get(machine_pwm_obj_t *self) {
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if (!self->active) {
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pwm_add(self->pin->phys_port, self->pin->periph, self->pin->func);
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self->active = 1;
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}
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return MP_OBJ_NEW_SMALL_INT(pwm_get_duty(self->channel));
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}
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STATIC void mp_machine_pwm_duty_set(machine_pwm_obj_t *self, mp_int_t duty) {
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if (!self->active) {
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pwm_add(self->pin->phys_port, self->pin->periph, self->pin->func);
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self->active = 1;
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}
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pwm_set_duty(duty, self->channel);
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pwm_start();
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}
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