circuitpython/ports/esp32s2/common-hal/pulseio/PWMOut.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
 * Uses code from Micropython, Copyright (c) 2013-2016 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 "common-hal/pulseio/PWMOut.h"
#include "shared-bindings/pulseio/PWMOut.h"
#include "py/runtime.h"
#include "driver/ledc.h"

#define LEDC_LS_TIMER          LEDC_TIMER_1
#define LEDC_LS_MODE           LEDC_LOW_SPEED_MODE
#define LEDC_LS_CH0_GPIO       (18)
#define LEDC_LS_CH0_CHANNEL    LEDC_CHANNEL_0
#define LEDC_LS_CH1_GPIO       (19)
#define LEDC_LS_CH1_CHANNEL    LEDC_CHANNEL_1
#define LEDC_LS_CH2_GPIO       (4)
#define LEDC_LS_CH2_CHANNEL    LEDC_CHANNEL_2
#define LEDC_LS_CH3_GPIO       (5)
#define LEDC_LS_CH3_CHANNEL    LEDC_CHANNEL_3

#define LEDC_TEST_CH_NUM       (4)
#define LEDC_TEST_DUTY         (4000)
#define LEDC_TEST_FADE_TIME    (3000)



void pwmout_reset(void) {
}

pwmout_result_t common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
                                                    const mcu_pin_obj_t* pin,
                                                    uint16_t duty,
                                                    uint32_t frequency,
                                                    bool variable_frequency) {
    ledc_timer_config_t ledc_timer = {
        .duty_resolution = LEDC_TIMER_16_BIT,   // resolution of PWM duty
        .freq_hz = frequency,                   // frequency of PWM signal
        .speed_mode = LEDC_LS_MODE,             // timer mode
        .timer_num = LEDC_LS_TIMER,             // timer index
        .clk_cfg = LEDC_AUTO_CLK,               // Auto select the source clock
    };
    // Set configuration of timer0 for high speed channels
    ledc_timer_config(&ledc_timer);

    ledc_channel_config_t pwm_channel = {
        .channel    = LEDC_LS_CH0_CHANNEL,
        .duty       = 0,
        .gpio_num   = pin->number,
        .speed_mode = LEDC_LS_MODE,
        .hpoint     = 0,
        .timer_sel  = LEDC_LS_TIMER
    };

    // Set LED Controller with previously prepared configuration
    for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
        ledc_channel_config(&ledc_channel[ch]);
    }

    for (ch = 0; ch < LEDC_TEST_CH_NUM; ch++) {
        ledc_set_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel, duty*2);
        ledc_update_duty(ledc_channel[ch].speed_mode, ledc_channel[ch].channel);
    }

    return PWMOUT_OK;
}

void common_hal_pulseio_pwmout_never_reset(pulseio_pwmout_obj_t *self) {
}

void common_hal_pulseio_pwmout_reset_ok(pulseio_pwmout_obj_t *self) {
}

bool common_hal_pulseio_pwmout_deinited(pulseio_pwmout_obj_t* self) {
    return false;
}

void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self) {
}

void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty) {
}

uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t* self) {
    return false;
}

void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t* self, uint32_t frequency) {
}

uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t* self) {
    return false;
}

bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t* self) {
    return false;
}