mirror of
https://github.com/licsber/micropython.git
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3209a13bf5
machine/i2c already uses mp_hal_get_pin_obj which points to pin_find function in order to locate correct pin object to use. The pin_find function was recently updated to also being able to locate pins based on an integer value, such that pin number can be used as argument to object constructors. This patch modfies and uniforms pin object lookup for SPI, music and pwm.
354 lines
12 KiB
C
354 lines
12 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) 2016-2018 Glenn Ruben Bakke
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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 <stdio.h>
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#include <string.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/mphal.h"
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#if MICROPY_PY_MACHINE_HW_PWM
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#include "pin.h"
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#include "genhdr/pins.h"
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#include "pwm.h"
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#if defined(NRF52_SERIES)
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// Use PWM hardware.
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#include "nrfx_pwm.h"
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#endif
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typedef enum {
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MODE_LOW_HIGH,
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MODE_HIGH_LOW
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} pwm_mode_t;
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typedef struct {
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uint8_t pwm_pin;
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uint8_t duty;
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uint16_t pulse_width;
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uint16_t period;
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nrf_pwm_clk_t freq;
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pwm_mode_t mode;
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} machine_pwm_config_t;
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typedef struct _machine_hard_pwm_obj_t {
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mp_obj_base_t base;
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const nrfx_pwm_t * p_pwm;
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machine_pwm_config_t * p_config;
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} machine_hard_pwm_obj_t;
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STATIC const nrfx_pwm_t machine_hard_pwm_instances[] = {
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#if NRF52
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NRFX_PWM_INSTANCE(0),
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NRFX_PWM_INSTANCE(1),
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NRFX_PWM_INSTANCE(2),
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#elif NRF52840
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NRFX_PWM_INSTANCE(3),
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#else
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NULL
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#endif
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};
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STATIC machine_pwm_config_t hard_configs[MP_ARRAY_SIZE(machine_hard_pwm_instances)];
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STATIC const machine_hard_pwm_obj_t machine_hard_pwm_obj[] = {
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#if NRF52
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{{&machine_hard_pwm_type}, .p_pwm = &machine_hard_pwm_instances[0], .p_config = &hard_configs[0]},
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{{&machine_hard_pwm_type}, .p_pwm = &machine_hard_pwm_instances[1], .p_config = &hard_configs[0]},
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{{&machine_hard_pwm_type}, .p_pwm = &machine_hard_pwm_instances[2], .p_config = &hard_configs[0]},
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#elif NRF52840
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{{&machine_hard_pwm_type}, .p_pwm = &machine_hard_pwm_instances[3], .p_config = &hard_configs[0]},
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#endif
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};
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void pwm_init0(void) {
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}
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STATIC int hard_pwm_find(mp_obj_t id) {
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if (MP_OBJ_IS_INT(id)) {
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// given an integer id
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int pwm_id = mp_obj_get_int(id);
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if (pwm_id >= 0 && pwm_id <= MP_ARRAY_SIZE(machine_hard_pwm_obj)) {
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return pwm_id;
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}
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
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"PWM(%d) does not exist", pwm_id));
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}
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return -1;
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}
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STATIC void machine_pwm_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hard_pwm_obj_t *self = self_in;
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mp_printf(print, "PWM(%u)", self->p_pwm->drv_inst_idx);
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}
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/******************************************************************************/
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/* MicroPython bindings for machine API */
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STATIC mp_obj_t machine_hard_pwm_make_new(mp_arg_val_t *args);
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STATIC void machine_hard_pwm_init(mp_obj_t self, mp_arg_val_t *args);
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STATIC void machine_hard_pwm_deinit(mp_obj_t self);
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STATIC mp_obj_t machine_hard_pwm_freq(mp_obj_t self, mp_arg_val_t *args);
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/* common code for both soft and hard implementations *************************/
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STATIC mp_obj_t machine_pwm_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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enum { ARG_id, ARG_pin, ARG_freq, ARG_period, ARG_duty, ARG_pulse_width, ARG_mode };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
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{ MP_QSTR_pin, MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_period, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_duty, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_pulse_width, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_mode, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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};
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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if (args[ARG_id].u_obj == MP_OBJ_NEW_SMALL_INT(-1)) {
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// TODO: implement soft PWM
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// return machine_soft_pwm_make_new(args);
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return mp_const_none;
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} else {
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// hardware peripheral id given
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return machine_hard_pwm_make_new(args);
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}
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}
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STATIC mp_obj_t machine_pwm_init(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_INIT_pin };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_pin, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} }
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};
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// parse args
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mp_obj_t self = pos_args[0];
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// dispatch to specific implementation
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if (mp_obj_get_type(self) == &machine_hard_pwm_type) {
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machine_hard_pwm_init(self, args);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(machine_pwm_init_obj, 1, machine_pwm_init);
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STATIC mp_obj_t machine_pwm_deinit(mp_obj_t self) {
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// dispatch to specific implementation
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if (mp_obj_get_type(self) == &machine_hard_pwm_type) {
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machine_hard_pwm_deinit(self);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_pwm_deinit_obj, machine_pwm_deinit);
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STATIC mp_obj_t machine_pwm_freq(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_FREQ_freq };
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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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};
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mp_obj_t self = pos_args[0];
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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if (mp_obj_get_type(self) == &machine_hard_pwm_type) {
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machine_hard_pwm_freq(self, args);
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} else {
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// soft pwm
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mp_machine_pwm_freq_obj, 1, machine_pwm_freq);
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STATIC mp_obj_t machine_pwm_period(size_t n_args, const mp_obj_t *args) {
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_pwm_period_obj, 1, 2, machine_pwm_period);
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STATIC mp_obj_t machine_pwm_duty(size_t n_args, const mp_obj_t *args) {
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_pwm_duty_obj, 1, 2, machine_pwm_duty);
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STATIC const mp_rom_map_elem_t machine_pwm_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&machine_pwm_init_obj) },
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_pwm_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR_freq), MP_ROM_PTR(&mp_machine_pwm_freq_obj) },
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{ MP_ROM_QSTR(MP_QSTR_period), MP_ROM_PTR(&mp_machine_pwm_period_obj) },
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{ MP_ROM_QSTR(MP_QSTR_duty), MP_ROM_PTR(&mp_machine_pwm_duty_obj) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_16MHZ), MP_ROM_INT(NRF_PWM_CLK_16MHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_8MHZ), MP_ROM_INT(NRF_PWM_CLK_8MHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_4MHZ), MP_ROM_INT(NRF_PWM_CLK_4MHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_2MHZ), MP_ROM_INT(NRF_PWM_CLK_2MHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_1MHZ), MP_ROM_INT(NRF_PWM_CLK_1MHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_500KHZ), MP_ROM_INT(NRF_PWM_CLK_500kHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_250KHZ), MP_ROM_INT(NRF_PWM_CLK_250kHz) },
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{ MP_ROM_QSTR(MP_QSTR_FREQ_125KHZ), MP_ROM_INT(NRF_PWM_CLK_125kHz) },
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{ MP_ROM_QSTR(MP_QSTR_MODE_LOW_HIGH), MP_ROM_INT(MODE_LOW_HIGH) },
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{ MP_ROM_QSTR(MP_QSTR_MODE_HIGH_LOW), MP_ROM_INT(MODE_HIGH_LOW) },
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};
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STATIC MP_DEFINE_CONST_DICT(machine_pwm_locals_dict, machine_pwm_locals_dict_table);
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/* code for hard implementation ***********************************************/
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STATIC mp_obj_t machine_hard_pwm_make_new(mp_arg_val_t *args) {
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enum { ARG_id, ARG_pin, ARG_freq, ARG_period, ARG_duty, ARG_pulse_width, ARG_mode };
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// get static peripheral object
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int pwm_id = hard_pwm_find(args[ARG_id].u_obj);
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const machine_hard_pwm_obj_t *self = &machine_hard_pwm_obj[pwm_id];
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// check if PWM pin is set
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if (args[ARG_pin].u_obj != MP_OBJ_NULL) {
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self->p_config->pwm_pin = mp_hal_get_pin_obj(args[ARG_pin].u_obj)->pin;
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} else {
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// TODO: raise exception.
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}
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if (args[ARG_freq].u_obj != MP_OBJ_NULL) {
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self->p_config->freq = mp_obj_get_int(args[ARG_freq].u_obj);
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} else {
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self->p_config->freq = 50; // 50 Hz by default.
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}
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if (args[ARG_period].u_obj != MP_OBJ_NULL) {
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self->p_config->period = mp_obj_get_int(args[ARG_period].u_obj);
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} else {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
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"PWM period has to be within 16000 frequence cycles", self->p_config->period));
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}
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if (args[ARG_duty].u_obj != MP_OBJ_NULL) {
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self->p_config->duty = mp_obj_get_int(args[ARG_duty].u_obj);
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} else {
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self->p_config->duty = 50; // 50% by default.
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}
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if (args[ARG_pulse_width].u_obj != MP_OBJ_NULL) {
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self->p_config->pulse_width = mp_obj_get_int(args[ARG_pulse_width].u_obj);
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} else {
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self->p_config->pulse_width = 0;
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}
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if (args[ARG_mode].u_obj != MP_OBJ_NULL) {
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self->p_config->mode = mp_obj_get_int(args[ARG_mode].u_obj);
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} else {
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self->p_config->mode = MODE_HIGH_LOW;
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}
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC void machine_hard_pwm_init(mp_obj_t self_in, mp_arg_val_t *args) {
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machine_hard_pwm_obj_t *self = self_in;
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nrfx_pwm_config_t config;
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config.output_pins[0] = self->p_config->pwm_pin;
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config.output_pins[1] = NRFX_PWM_PIN_NOT_USED;
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config.output_pins[2] = NRFX_PWM_PIN_NOT_USED;
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config.output_pins[3] = NRFX_PWM_PIN_NOT_USED;
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config.irq_priority = 6;
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config.base_clock = self->p_config->freq;
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config.count_mode = NRF_PWM_MODE_UP;
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config.top_value = self->p_config->period;
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config.load_mode = NRF_PWM_LOAD_INDIVIDUAL;
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config.step_mode = NRF_PWM_STEP_AUTO;
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nrfx_pwm_init(self->p_pwm, &config, NULL);
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uint16_t pulse_width = ((self->p_config->period * self->p_config->duty) / 100);
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// If manual period has been set, override duty-cycle.
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if (self->p_config->pulse_width > 0) {
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pulse_width = self->p_config->pulse_width;
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}
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// TODO: Move DMA buffer to global memory.
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volatile static uint16_t pwm_seq[4];
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if (self->p_config->mode == MODE_HIGH_LOW) {
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pwm_seq[0] = self->p_config->period - pulse_width;
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pwm_seq[1] = self->p_config->period - pulse_width;
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} else {
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pwm_seq[0] = self->p_config->period - pulse_width;
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pwm_seq[1] = self->p_config->period - pulse_width;
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}
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pwm_seq[2] = self->p_config->period - pulse_width;
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pwm_seq[3] = self->p_config->period - pulse_width;
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const nrf_pwm_sequence_t pwm_sequence = {
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.values.p_raw = (const uint16_t *)&pwm_seq,
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.length = 4,
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.repeats = 0,
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.end_delay = 0
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};
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nrfx_pwm_simple_playback(self->p_pwm,
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&pwm_sequence,
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0, // Loop disabled.
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0);
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}
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STATIC void machine_hard_pwm_deinit(mp_obj_t self_in) {
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machine_hard_pwm_obj_t *self = self_in;
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(void)self;
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nrfx_pwm_stop(self->p_pwm, true);
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nrfx_pwm_uninit(self->p_pwm);
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}
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STATIC mp_obj_t machine_hard_pwm_freq(mp_obj_t self_in, mp_arg_val_t *args) {
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machine_hard_pwm_obj_t *self = self_in;
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(void)self;
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return mp_const_none;
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}
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const mp_obj_type_t machine_hard_pwm_type = {
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{ &mp_type_type },
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.name = MP_QSTR_PWM,
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.print = machine_pwm_print,
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.make_new = machine_pwm_make_new,
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.locals_dict = (mp_obj_dict_t*)&machine_pwm_locals_dict,
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};
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#endif // MICROPY_PY_MACHINE_HW_PWM
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