cx-chlcd/sources/hal_esp32.c

#ifdef CHLCD_ON_ESP

#include <cx/chlcd.h>

#include <driver/gpio.h>
#include <driver/ledc.h>
#include <rom/ets_sys.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>

#ifndef CHLCD_LED_PWM_TIMER
#define CHLCD_LED_PWM_TIMER LEDC_TIMER_MAX
#endif

#ifndef CHLCD_LED_PWM_CHANNEL 
#define CHLCD_LED_PWM_CHANNEL LEDC_CHANNEL_MAX
#endif

#ifndef CHLCD_LED_PWM_FREQUENCY
#define CHLCD_LED_PWM_FREQUENCY 20000
#endif


chlcd_error_t chlcd_pin_set_output(chlcd_pin_t target) {
    if (gpio_output_enable(target) == ESP_OK) {
        return CHLCD_SUCCESS;
    }

    return CHLCD_BAD_ARGUMENT;
}

chlcd_error_t chlcd_pin_write(chlcd_pin_t target, bool state) {
    if (gpio_set_level(target, state ? 1 : 0) == ESP_OK) {
        return CHLCD_SUCCESS;
    }

    return CHLCD_BAD_ARGUMENT;
}

chlcd_error_t chlcd_pin_set_pwm(chlcd_pin_t target) {
    ledc_timer_config_t timer_config[1] = {0};
    timer_config->speed_mode = LEDC_LOW_SPEED_MODE;
    timer_config->duty_resolution = LEDC_TIMER_12_BIT;
    timer_config->clk_cfg = LEDC_AUTO_CLK;
    timer_config->freq_hz = CHLCD_LED_PWM_FREQUENCY;
    timer_config->timer_num = CHLCD_LED_PWM_CHANNEL;

    if (ledc_timer_config(timer_config) != ESP_OK) {
        return CHLCD_BAD_ARGUMENT;
    }

    ledc_channel_config_t channel_config[1] = {0};
    channel_config->speed_mode = LEDC_LOW_SPEED_MODE;
    channel_config->channel = CHLCD_LED_PWM_CHANNEL;
    channel_config->timer_sel = CHLCD_LED_PWM_TIMER;
    channel_config->gpio_num = target;
    channel_config->duty = 0;
    channel_config->hpoint = 0;
    channel_config->sleep_mode = LEDC_SLEEP_MODE_KEEP_ALIVE;

    if (ledc_channel_config(channel_config) != ESP_OK) {
        return CHLCD_BAD_ARGUMENT;
    }

    return CHLCD_SUCCESS;
}

chlcd_error_t chlcd_pin_write_pwm(
    chlcd_pin_t target, 
    uint16_t pwm
) {
    return CHLCD_SUCCESS;
}

chlcd_error_t chlcd_sleep_us(uint32_t time) {
    if (time < 1000) {
        ets_delay_us(time); 
        return CHLCD_SUCCESS;
    }

    vTaskDelay(time / 1000 / portTICK_PERIOD_MS);
    return CHLCD_SUCCESS;
}

#endif