diff options
Diffstat (limited to 'esp8266/machine_pwm.c')
| -rw-r--r-- | esp8266/machine_pwm.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/esp8266/machine_pwm.c b/esp8266/machine_pwm.c new file mode 100644 index 0000000000..5d30f09656 --- /dev/null +++ b/esp8266/machine_pwm.c @@ -0,0 +1,172 @@ +/* + * This file is part of the Micro Python 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/nlr.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; + +STATIC 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, +}; |