led_strip.h

// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once

#ifdef __cplusplus
extern "C" {
#endif

#include "esp_err.h"

/**
* @brief LED Strip Type
*
*/
typedef struct led_strip_s led_strip_t;

/**
* @brief LED Strip Device Type
*
*/
typedef void *led_strip_dev_t;

/**
* @brief Declare of LED Strip Type
*
*/
struct led_strip_s {
    /**
    * @brief Set RGB for a specific pixel
    *
    * @param strip: LED strip
    * @param index: index of pixel to set
    * @param red: red part of color
    * @param green: green part of color
    * @param blue: blue part of color
    *
    * @return
    *      - ESP_OK: Set RGB for a specific pixel successfully
    *      - ESP_ERR_INVALID_ARG: Set RGB for a specific pixel failed because of invalid parameters
    *      - ESP_FAIL: Set RGB for a specific pixel failed because other error occurred
    */
    esp_err_t (*set_pixel)(led_strip_t *strip, uint32_t index, uint32_t red, uint32_t green, uint32_t blue);

    /**
    * @brief Refresh memory colors to LEDs
    *
    * @param strip: LED strip
    * @param timeout_ms: timeout value for refreshing task
    *
    * @return
    *      - ESP_OK: Refresh successfully
    *      - ESP_ERR_TIMEOUT: Refresh failed because of timeout
    *      - ESP_FAIL: Refresh failed because some other error occurred
    *
    * @note:
    *      After updating the LED colors in the memory, a following invocation of this API is needed to flush colors to strip.
    */
    esp_err_t (*refresh)(led_strip_t *strip, uint32_t timeout_ms);

    /**
    * @brief Clear LED strip (turn off all LEDs)
    *
    * @param strip: LED strip
    * @param timeout_ms: timeout value for clearing task
    *
    * @return
    *      - ESP_OK: Clear LEDs successfully
    *      - ESP_ERR_TIMEOUT: Clear LEDs failed because of timeout
    *      - ESP_FAIL: Clear LEDs failed because some other error occurred
    */
    esp_err_t (*clear)(led_strip_t *strip, uint32_t timeout_ms);

    /**
    * @brief Free LED strip resources
    *
    * @param strip: LED strip
    *
    * @return
    *      - ESP_OK: Free resources successfully
    *      - ESP_FAIL: Free resources failed because error occurred
    */
    esp_err_t (*del)(led_strip_t *strip);
};

/**
* @brief LED Strip Configuration Type
*
*/
typedef struct {
    uint32_t max_leds;   /*!< Maximum LEDs in a single strip */
    led_strip_dev_t dev; /*!< LED strip device (e.g. RMT channel, PWM channel, etc) */
} led_strip_config_t;

/**
 * @brief Default configuration for LED strip
 *
 */
#define LED_STRIP_DEFAULT_CONFIG(number, dev_hdl) \
    {                                             \
        .max_leds = number,                       \
        .dev = dev_hdl,                           \
    }

/**
* @brief Install a new ws2812 driver (based on RMT peripheral)
*
* @param config: LED strip configuration
* @return
*      LED strip instance or NULL
*/
led_strip_t *led_strip_new_rmt_ws2812(const led_strip_config_t *config);

/**
 * @brief Init the RMT peripheral and LED strip configuration.
 *
 * @param[in] channel: RMT peripheral channel number.
 * @param[in] gpio: GPIO number for the RMT data output.
 * @param[in] led_num: number of addressable LEDs.
 * @return
 *      LED strip instance or NULL
 */
led_strip_t *led_strip_init(uint8_t channel, uint8_t gpio, uint16_t led_num);

/**
 * @brief Denit the RMT peripheral.
 *
 * @param[in] strip: LED strip
 * @return
 *     - ESP_OK
 *     - ESP_FAIL
 */
esp_err_t led_strip_denit(led_strip_t *strip);

#ifdef __cplusplus
}
#endif