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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 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 <stdint.h>
#include "esppwm.h"
#include "py/runtime.h"
#include "modmachine.h"
typedef struct _pyb_pwm_obj_t {
mp_obj_base_t base;
pyb_pin_obj_t *pin;
uint8_t active;
uint8_t channel;
} pyb_pwm_obj_t;
bool pwm_inited = false;
/******************************************************************************/
// MicroPython bindings for PWM
STATIC void pyb_pwm_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
pyb_pwm_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "PWM(%u", self->pin->phys_port);
if (self->active) {
mp_printf(print, ", freq=%u, duty=%u",
pwm_get_freq(self->channel), pwm_get_duty(self->channel));
}
mp_printf(print, ")");
}
STATIC void pyb_pwm_init_helper(pyb_pwm_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_freq, ARG_duty };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_freq, MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_duty, MP_ARG_INT, {.u_int = -1} },
};
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);
int channel = pwm_add(self->pin->phys_port, self->pin->periph, self->pin->func);
if (channel == -1) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"PWM not supported on pin %d", self->pin->phys_port));
}
self->channel = channel;
self->active = 1;
if (args[ARG_freq].u_int != -1) {
pwm_set_freq(args[ARG_freq].u_int, self->channel);
}
if (args[ARG_duty].u_int != -1) {
pwm_set_duty(args[ARG_duty].u_int, self->channel);
}
pwm_start();
}
STATIC mp_obj_t pyb_pwm_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
pyb_pin_obj_t *pin = mp_obj_get_pin_obj(args[0]);
// create PWM object from the given pin
pyb_pwm_obj_t *self = m_new_obj(pyb_pwm_obj_t);
self->base.type = &pyb_pwm_type;
self->pin = pin;
self->active = 0;
self->channel = -1;
// start the PWM subsystem if it's not already running
if (!pwm_inited) {
pwm_init();
pwm_inited = true;
}
// start the PWM running for this channel
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
pyb_pwm_init_helper(self, n_args - 1, args + 1, &kw_args);
return MP_OBJ_FROM_PTR(self);
}
STATIC mp_obj_t pyb_pwm_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
pyb_pwm_init_helper(args[0], n_args - 1, args + 1, kw_args);
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_KW(pyb_pwm_init_obj, 1, pyb_pwm_init);
STATIC mp_obj_t pyb_pwm_deinit(mp_obj_t self_in) {
pyb_pwm_obj_t *self = MP_OBJ_TO_PTR(self_in);
pwm_delete(self->channel);
self->active = 0;
pwm_start();
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(pyb_pwm_deinit_obj, pyb_pwm_deinit);
STATIC mp_obj_t pyb_pwm_freq(size_t n_args, const mp_obj_t *args) {
//pyb_pwm_obj_t *self = MP_OBJ_TO_PTR(args[0]);
if (n_args == 1) {
// get
return MP_OBJ_NEW_SMALL_INT(pwm_get_freq(0));
} else {
// set
pwm_set_freq(mp_obj_get_int(args[1]), 0);
pwm_start();
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_pwm_freq_obj, 1, 2, pyb_pwm_freq);
STATIC mp_obj_t pyb_pwm_duty(size_t n_args, const mp_obj_t *args) {
pyb_pwm_obj_t *self = MP_OBJ_TO_PTR(args[0]);
if (!self->active) {
pwm_add(self->pin->phys_port, self->pin->periph, self->pin->func);
self->active = 1;
}
if (n_args == 1) {
// get
return MP_OBJ_NEW_SMALL_INT(pwm_get_duty(self->channel));
} else {
// set
pwm_set_duty(mp_obj_get_int(args[1]), self->channel);
pwm_start();
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_pwm_duty_obj, 1, 2, pyb_pwm_duty);
STATIC const mp_rom_map_elem_t pyb_pwm_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&pyb_pwm_init_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pyb_pwm_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_freq), MP_ROM_PTR(&pyb_pwm_freq_obj) },
{ MP_ROM_QSTR(MP_QSTR_duty), MP_ROM_PTR(&pyb_pwm_duty_obj) },
};
STATIC MP_DEFINE_CONST_DICT(pyb_pwm_locals_dict, pyb_pwm_locals_dict_table);
const mp_obj_type_t pyb_pwm_type = {
{ &mp_type_type },
.name = MP_QSTR_PWM,
.print = pyb_pwm_print,
.make_new = pyb_pwm_make_new,
.locals_dict = (mp_obj_dict_t*)&pyb_pwm_locals_dict,
};