You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
197 lines
7.7 KiB
197 lines
7.7 KiB
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2020-2021 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 "py/runtime.h"
|
|
#include "py/mphal.h"
|
|
#include "modmachine.h"
|
|
|
|
#include "hardware/clocks.h"
|
|
#include "hardware/pwm.h"
|
|
|
|
/******************************************************************************/
|
|
// MicroPython bindings for machine.PWM
|
|
|
|
const mp_obj_type_t machine_pwm_type;
|
|
|
|
typedef struct _machine_pwm_obj_t {
|
|
mp_obj_base_t base;
|
|
uint8_t slice;
|
|
uint8_t channel;
|
|
} machine_pwm_obj_t;
|
|
|
|
STATIC machine_pwm_obj_t machine_pwm_obj[] = {
|
|
{{&machine_pwm_type}, 0, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 0, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 1, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 1, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 2, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 2, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 3, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 3, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 4, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 4, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 5, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 5, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 6, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 6, PWM_CHAN_B},
|
|
{{&machine_pwm_type}, 7, PWM_CHAN_A},
|
|
{{&machine_pwm_type}, 7, PWM_CHAN_B},
|
|
};
|
|
|
|
STATIC void machine_pwm_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
|
|
machine_pwm_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
mp_printf(print, "<PWM slice=%u channel=%u>", self->slice, self->channel);
|
|
}
|
|
|
|
// PWM(pin)
|
|
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) {
|
|
// Check number of arguments
|
|
mp_arg_check_num(n_args, n_kw, 1, 1, false);
|
|
|
|
// Get GPIO to connect to PWM.
|
|
uint32_t gpio = mp_hal_get_pin_obj(all_args[0]);
|
|
|
|
// Get static peripheral object.
|
|
uint slice = pwm_gpio_to_slice_num(gpio);
|
|
uint8_t channel = pwm_gpio_to_channel(gpio);
|
|
const machine_pwm_obj_t *self = &machine_pwm_obj[slice * 2 + channel];
|
|
|
|
// Select PWM function for given GPIO.
|
|
gpio_set_function(gpio, GPIO_FUNC_PWM);
|
|
|
|
return MP_OBJ_FROM_PTR(self);
|
|
}
|
|
|
|
STATIC mp_obj_t machine_pwm_deinit(mp_obj_t self_in) {
|
|
machine_pwm_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
pwm_set_enabled(self->slice, false);
|
|
return mp_const_none;
|
|
}
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_pwm_deinit_obj, machine_pwm_deinit);
|
|
|
|
// PWM.freq([value])
|
|
STATIC mp_obj_t machine_pwm_freq(size_t n_args, const mp_obj_t *args) {
|
|
machine_pwm_obj_t *self = MP_OBJ_TO_PTR(args[0]);
|
|
uint32_t source_hz = clock_get_hz(clk_sys);
|
|
if (n_args == 1) {
|
|
// Get frequency.
|
|
uint32_t div16 = pwm_hw->slice[self->slice].div;
|
|
uint32_t top = pwm_hw->slice[self->slice].top;
|
|
uint32_t pwm_freq = 16 * source_hz / div16 / top;
|
|
return MP_OBJ_NEW_SMALL_INT(pwm_freq);
|
|
} else {
|
|
// Set the frequency, making "top" as large as possible for maximum resolution.
|
|
// Maximum "top" is set at 65534 to be able to achieve 100% duty with 65535.
|
|
#define TOP_MAX 65534
|
|
mp_int_t freq = mp_obj_get_int(args[1]);
|
|
uint32_t div16_top = 16 * source_hz / freq;
|
|
uint32_t top = 1;
|
|
for (;;) {
|
|
// Try a few small prime factors to get close to the desired frequency.
|
|
if (div16_top >= 16 * 5 && div16_top % 5 == 0 && top * 5 <= TOP_MAX) {
|
|
div16_top /= 5;
|
|
top *= 5;
|
|
} else if (div16_top >= 16 * 3 && div16_top % 3 == 0 && top * 3 <= TOP_MAX) {
|
|
div16_top /= 3;
|
|
top *= 3;
|
|
} else if (div16_top >= 16 * 2 && top * 2 <= TOP_MAX) {
|
|
div16_top /= 2;
|
|
top *= 2;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
if (div16_top < 16) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("freq too large"));
|
|
} else if (div16_top >= 256 * 16) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("freq too small"));
|
|
}
|
|
pwm_hw->slice[self->slice].div = div16_top;
|
|
pwm_hw->slice[self->slice].top = top;
|
|
return mp_const_none;
|
|
}
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_pwm_freq_obj, 1, 2, machine_pwm_freq);
|
|
|
|
// PWM.duty_u16([value])
|
|
STATIC mp_obj_t machine_pwm_duty_u16(size_t n_args, const mp_obj_t *args) {
|
|
machine_pwm_obj_t *self = MP_OBJ_TO_PTR(args[0]);
|
|
uint32_t top = pwm_hw->slice[self->slice].top;
|
|
if (n_args == 1) {
|
|
// Get duty cycle.
|
|
uint32_t cc = pwm_hw->slice[self->slice].cc;
|
|
cc = (cc >> (self->channel ? PWM_CH0_CC_B_LSB : PWM_CH0_CC_A_LSB)) & 0xffff;
|
|
return MP_OBJ_NEW_SMALL_INT(cc * 65535 / (top + 1));
|
|
} else {
|
|
// Set duty cycle.
|
|
mp_int_t duty_u16 = mp_obj_get_int(args[1]);
|
|
uint32_t cc = duty_u16 * (top + 1) / 65535;
|
|
pwm_set_chan_level(self->slice, self->channel, cc);
|
|
pwm_set_enabled(self->slice, true);
|
|
return mp_const_none;
|
|
}
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_pwm_duty_u16_obj, 1, 2, machine_pwm_duty_u16);
|
|
|
|
// PWM.duty_ns([value])
|
|
STATIC mp_obj_t machine_pwm_duty_ns(size_t n_args, const mp_obj_t *args) {
|
|
machine_pwm_obj_t *self = MP_OBJ_TO_PTR(args[0]);
|
|
uint32_t source_hz = clock_get_hz(clk_sys);
|
|
uint32_t slice_hz = 16 * source_hz / pwm_hw->slice[self->slice].div;
|
|
if (n_args == 1) {
|
|
// Get duty cycle.
|
|
uint32_t cc = pwm_hw->slice[self->slice].cc;
|
|
cc = (cc >> (self->channel ? PWM_CH0_CC_B_LSB : PWM_CH0_CC_A_LSB)) & 0xffff;
|
|
return MP_OBJ_NEW_SMALL_INT((uint64_t)cc * 1000000000ULL / slice_hz);
|
|
} else {
|
|
// Set duty cycle.
|
|
mp_int_t duty_ns = mp_obj_get_int(args[1]);
|
|
uint32_t cc = (uint64_t)duty_ns * slice_hz / 1000000000ULL;
|
|
if (cc > 65535) {
|
|
mp_raise_ValueError(MP_ERROR_TEXT("duty larger than period"));
|
|
}
|
|
pwm_set_chan_level(self->slice, self->channel, cc);
|
|
pwm_set_enabled(self->slice, true);
|
|
return mp_const_none;
|
|
}
|
|
}
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_pwm_duty_ns_obj, 1, 2, machine_pwm_duty_ns);
|
|
|
|
STATIC const mp_rom_map_elem_t machine_pwm_locals_dict_table[] = {
|
|
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&machine_pwm_deinit_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_freq), MP_ROM_PTR(&machine_pwm_freq_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_duty_u16), MP_ROM_PTR(&machine_pwm_duty_u16_obj) },
|
|
{ MP_ROM_QSTR(MP_QSTR_duty_ns), MP_ROM_PTR(&machine_pwm_duty_ns_obj) },
|
|
};
|
|
STATIC MP_DEFINE_CONST_DICT(machine_pwm_locals_dict, machine_pwm_locals_dict_table);
|
|
|
|
const mp_obj_type_t machine_pwm_type = {
|
|
{ &mp_type_type },
|
|
.name = MP_QSTR_PWM,
|
|
.print = machine_pwm_print,
|
|
.make_new = machine_pwm_make_new,
|
|
.locals_dict = (mp_obj_dict_t *)&machine_pwm_locals_dict,
|
|
};
|
|
|