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esp-idf/components/driver/include/driver/ledc.h

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/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
#include "esp_err.h"
#include "esp_intr_alloc.h"
#include "hal/ledc_types.h"
#include "driver/gpio.h"
#ifdef __cplusplus
extern "C" {
#endif
#if SOC_LEDC_SUPPORT_APB_CLOCK
/**
* @brief Frequency of one of the LEDC peripheral clock sources, APB_CLK
* @note This macro should have no use in your application, we keep it here only for backward compatible
*/
#define LEDC_APB_CLK_HZ _Pragma ("GCC warning \"'LEDC_APB_CLK_HZ' macro is deprecated\"") (APB_CLK_FREQ)
#endif
#if SOC_LEDC_SUPPORT_REF_TICK
/**
* @brief Frequency of one of the LEDC peripheral clock sources, REF_TICK
* @note This macro should have no use in your application, we keep it here only for backward compatible
*/
#define LEDC_REF_CLK_HZ _Pragma ("GCC warning \"'LEDC_REF_CLK_HZ' macro is deprecated\"") (REF_CLK_FREQ)
#endif
#define LEDC_ERR_DUTY (0xFFFFFFFF)
#define LEDC_ERR_VAL (-1)
/**
* @brief Configuration parameters of LEDC channel for ledc_channel_config function
*/
typedef struct {
int gpio_num; /*!< the LEDC output gpio_num, if you want to use gpio16, gpio_num = 16 */
ledc_mode_t speed_mode; /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
ledc_channel_t channel; /*!< LEDC channel (0 - 7) */
ledc_intr_type_t intr_type; /*!< configure interrupt, Fade interrupt enable or Fade interrupt disable */
ledc_timer_t timer_sel; /*!< Select the timer source of channel (0 - 3) */
uint32_t duty; /*!< LEDC channel duty, the range of duty setting is [0, (2**duty_resolution)] */
int hpoint; /*!< LEDC channel hpoint value, the max value is 0xfffff */
struct {
unsigned int output_invert: 1;/*!< Enable (1) or disable (0) gpio output invert */
} flags; /*!< LEDC flags */
} ledc_channel_config_t;
/**
* @brief Configuration parameters of LEDC Timer timer for ledc_timer_config function
*/
typedef struct {
ledc_mode_t speed_mode; /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
ledc_timer_bit_t duty_resolution; /*!< LEDC channel duty resolution */
ledc_timer_t timer_num; /*!< The timer source of channel (0 - 3) */
uint32_t freq_hz; /*!< LEDC timer frequency (Hz) */
ledc_clk_cfg_t clk_cfg; /*!< Configure LEDC source clock from ledc_clk_cfg_t.
Note that LEDC_USE_RTC8M_CLK and LEDC_USE_XTAL_CLK are
non-timer-specific clock sources. You can not have one LEDC timer uses
RTC8M_CLK as the clock source and have another LEDC timer uses XTAL_CLK
as its clock source. All chips except esp32 and esp32s2 do not have
timer-specific clock sources, which means clock source for all timers
must be the same one. */
} ledc_timer_config_t;
typedef intr_handle_t ledc_isr_handle_t;
/**
* @brief LEDC callback event type
*/
typedef enum {
LEDC_FADE_END_EVT /**< LEDC fade end event */
} ledc_cb_event_t;
/**
* @brief LEDC callback parameter
*/
typedef struct {
ledc_cb_event_t event; /**< Event name */
uint32_t speed_mode; /**< Speed mode of the LEDC channel group */
uint32_t channel; /**< LEDC channel (0 - LEDC_CHANNEL_MAX-1) */
uint32_t duty; /**< LEDC current duty of the channel, the range of duty is [0, (2**duty_resolution) - 1] */
} ledc_cb_param_t;
/**
* @brief Type of LEDC event callback
* @param param LEDC callback parameter
* @param user_arg User registered data
* @return Whether a high priority task has been waken up by this function
*/
typedef bool (*ledc_cb_t)(const ledc_cb_param_t *param, void *user_arg);
/**
* @brief Group of supported LEDC callbacks
* @note The callbacks are all running under ISR environment
*/
typedef struct {
ledc_cb_t fade_cb; /**< LEDC fade_end callback function */
} ledc_cbs_t;
/**
* @brief LEDC channel configuration
* Configure LEDC channel with the given channel/output gpio_num/interrupt/source timer/frequency(Hz)/LEDC duty resolution
*
* @param ledc_conf Pointer of LEDC channel configure struct
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t ledc_channel_config(const ledc_channel_config_t *ledc_conf);
/**
* @brief LEDC timer configuration
* Configure LEDC timer with the given source timer/frequency(Hz)/duty_resolution
*
* @param timer_conf Pointer of LEDC timer configure struct
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Can not find a proper pre-divider number base on the given frequency and the current duty_resolution.
*/
esp_err_t ledc_timer_config(const ledc_timer_config_t *timer_conf);
/**
* @brief LEDC update channel parameters
* @note Call this function to activate the LEDC updated parameters.
* After ledc_set_duty, we need to call this function to update the settings.
* And the new LEDC parameters don't take effect until the next PWM cycle.
* @note ledc_set_duty, ledc_set_duty_with_hpoint and ledc_update_duty are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_duty_and_update
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*
*/
esp_err_t ledc_update_duty(ledc_mode_t speed_mode, ledc_channel_t channel);
/**
* @brief Set LEDC output gpio.
*
* @note This function only routes the LEDC signal to GPIO through matrix, other LEDC resources initialization are not involved.
* Please use `ledc_channel_config()` instead to fully configure a LEDC channel.
*
* @param gpio_num The LEDC output gpio
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param ledc_channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t ledc_set_pin(int gpio_num, ledc_mode_t speed_mode, ledc_channel_t ledc_channel);
/**
* @brief LEDC stop.
* Disable LEDC output, and set idle level
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param idle_level Set output idle level after LEDC stops.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t ledc_stop(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t idle_level);
/**
* @brief LEDC set channel frequency (Hz)
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_num LEDC timer index (0-3), select from ledc_timer_t
* @param freq_hz Set the LEDC frequency
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_FAIL Can not find a proper pre-divider number base on the given frequency and the current duty_resolution.
*/
esp_err_t ledc_set_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num, uint32_t freq_hz);
/**
* @brief LEDC get channel frequency (Hz)
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_num LEDC timer index (0-3), select from ledc_timer_t
*
* @return
* - 0 error
* - Others Current LEDC frequency
*/
uint32_t ledc_get_freq(ledc_mode_t speed_mode, ledc_timer_t timer_num);
/**
* @brief LEDC set duty and hpoint value
* Only after calling ledc_update_duty will the duty update.
* @note ledc_set_duty, ledc_set_duty_with_hpoint and ledc_update_duty are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_duty_and_update
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param hpoint Set the LEDC hpoint value(max: 0xfffff)
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t ledc_set_duty_with_hpoint(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty, uint32_t hpoint);
/**
* @brief LEDC get hpoint value, the counter value when the output is set high level.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @return
* - LEDC_ERR_VAL if parameter error
* - Others Current hpoint value of LEDC channel
*/
int ledc_get_hpoint(ledc_mode_t speed_mode, ledc_channel_t channel);
/**
* @brief LEDC set duty
* This function do not change the hpoint value of this channel. if needed, please call ledc_set_duty_with_hpoint.
* only after calling ledc_update_duty will the duty update.
* @note ledc_set_duty, ledc_set_duty_with_hpoint and ledc_update_duty are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_duty_and_update.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution) - 1]
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t ledc_set_duty(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty);
/**
* @brief LEDC get duty
* This function returns the duty at the present PWM cycle.
* You shouldn't expect the function to return the new duty in the same cycle of calling ledc_update_duty,
* because duty update doesn't take effect until the next cycle.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
*
* @return
* - LEDC_ERR_DUTY if parameter error
* - Others Current LEDC duty
*/
uint32_t ledc_get_duty(ledc_mode_t speed_mode, ledc_channel_t channel);
/**
* @brief LEDC set gradient
* Set LEDC gradient, After the function calls the ledc_update_duty function, the function can take effect.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the start of the gradient duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param fade_direction Set the direction of the gradient
* @param step_num Set the number of the gradient
* @param duty_cycle_num Set how many LEDC tick each time the gradient lasts
* @param duty_scale Set gradient change amplitude
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t ledc_set_fade(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty, ledc_duty_direction_t fade_direction,
uint32_t step_num, uint32_t duty_cycle_num, uint32_t duty_scale);
/**
* @brief Register LEDC interrupt handler, the handler is an ISR.
* The handler will be attached to the same CPU core that this function is running on.
*
* @param fn Interrupt handler function.
* @param arg User-supplied argument passed to the handler function.
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
* @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
* be returned here.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Function pointer error.
*/
esp_err_t ledc_isr_register(void (*fn)(void *), void *arg, int intr_alloc_flags, ledc_isr_handle_t *handle);
/**
* @brief Configure LEDC settings
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_sel Timer index (0-3), there are 4 timers in LEDC module
* @param clock_divider Timer clock divide value, the timer clock is divided from the selected clock source
* @param duty_resolution Resolution of duty setting in number of bits. The range of duty values is [0, (2**duty_resolution)]
* @param clk_src Select LEDC source clock.
*
* @return
* - (-1) Parameter error
* - Other Current LEDC duty
*/
esp_err_t ledc_timer_set(ledc_mode_t speed_mode, ledc_timer_t timer_sel, uint32_t clock_divider, uint32_t duty_resolution, ledc_clk_src_t clk_src);
/**
* @brief Reset LEDC timer
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_sel LEDC timer index (0-3), select from ledc_timer_t
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
*/
esp_err_t ledc_timer_rst(ledc_mode_t speed_mode, ledc_timer_t timer_sel);
/**
* @brief Pause LEDC timer counter
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_sel LEDC timer index (0-3), select from ledc_timer_t
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
*
*/
esp_err_t ledc_timer_pause(ledc_mode_t speed_mode, ledc_timer_t timer_sel);
/**
* @brief Resume LEDC timer
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param timer_sel LEDC timer index (0-3), select from ledc_timer_t
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
*/
esp_err_t ledc_timer_resume(ledc_mode_t speed_mode, ledc_timer_t timer_sel);
/**
* @brief Bind LEDC channel with the selected timer
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param timer_sel LEDC timer index (0-3), select from ledc_timer_t
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
*/
esp_err_t ledc_bind_channel_timer(ledc_mode_t speed_mode, ledc_channel_t channel, ledc_timer_t timer_sel);
/**
* @brief Set LEDC fade function.
* @note Call ledc_fade_func_install() once before calling this function.
* Call ledc_fade_start() after this to start fading.
* @note ledc_set_fade_with_step, ledc_set_fade_with_time and ledc_fade_start are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_fade_step_and_start
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode. ,
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param scale Controls the increase or decrease step scale.
* @param cycle_num increase or decrease the duty every cycle_num cycles
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_with_step(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, uint32_t scale, uint32_t cycle_num);
/**
* @brief Set LEDC fade function, with a limited time.
* @note Call ledc_fade_func_install() once before calling this function.
* Call ledc_fade_start() after this to start fading.
* @note ledc_set_fade_with_step, ledc_set_fade_with_time and ledc_fade_start are not thread-safe, do not call these functions to
* control one LEDC channel in different tasks at the same time.
* A thread-safe version of API is ledc_set_fade_step_and_start
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode. ,
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param max_fade_time_ms The maximum time of the fading ( ms ).
*
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_with_time(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, int max_fade_time_ms);
/**
* @brief Install LEDC fade function. This function will occupy interrupt of LEDC module.
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function already installed.
*/
esp_err_t ledc_fade_func_install(int intr_alloc_flags);
/**
* @brief Uninstall LEDC fade function.
*
*/
void ledc_fade_func_uninstall(void);
/**
* @brief Start LEDC fading.
* @note Call ledc_fade_func_install() once before calling this function.
* Call this API right after ledc_set_fade_with_time or ledc_set_fade_with_step before to start fading.
* @note Starting fade operation with this API is not thread-safe, use with care.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel number
* @param fade_mode Whether to block until fading done. See ledc_types.h ledc_fade_mode_t for more info.
* Note that this function will not return until fading to the target duty if LEDC_FADE_WAIT_DONE mode is selected.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error.
*/
esp_err_t ledc_fade_start(ledc_mode_t speed_mode, ledc_channel_t channel, ledc_fade_mode_t fade_mode);
#if SOC_LEDC_SUPPORT_FADE_STOP
/**
* @brief Stop LEDC fading. Duty of the channel will stay at its present vlaue.
* @note This API can be called if a new fixed duty or a new fade want to be set while the last fade operation is still running in progress.
* @note Call this API will abort the fading operation only if it was started by calling ledc_fade_start with LEDC_FADE_NO_WAIT mode.
* @note If a fade was started with LEDC_FADE_WAIT_DONE mode, calling this API afterwards is no use in stopping the fade. Fade will continue until it reachs the target duty.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel number
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_ERR_INVALID_ARG Parameter error.
*/
esp_err_t ledc_fade_stop(ledc_mode_t speed_mode, ledc_channel_t channel);
#endif //SOC_LEDC_SUPPORT_FADE_STOP
/**
* @brief A thread-safe API to set duty for LEDC channel and return when duty updated.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
*
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param duty Set the LEDC duty, the range of duty setting is [0, (2**duty_resolution) - 1]
* @param hpoint Set the LEDC hpoint value(max: 0xfffff)
*
*/
esp_err_t ledc_set_duty_and_update(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t duty, uint32_t hpoint);
/**
* @brief A thread-safe API to set and start LEDC fade function, with a limited time.
* @note Call ledc_fade_func_install() once, before calling this function.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param max_fade_time_ms The maximum time of the fading ( ms ).
* @param fade_mode choose blocking or non-blocking mode
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_time_and_start(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, uint32_t max_fade_time_ms, ledc_fade_mode_t fade_mode);
/**
* @brief A thread-safe API to set and start LEDC fade function.
* @note Call ledc_fade_func_install() once before calling this function.
* @note For ESP32, hardware does not support any duty change while a fade operation is running in progress on that channel.
* Other duty operations will have to wait until the fade operation has finished.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param target_duty Target duty of fading [0, (2**duty_resolution) - 1]
* @param scale Controls the increase or decrease step scale.
* @param cycle_num increase or decrease the duty every cycle_num cycles
* @param fade_mode choose blocking or non-blocking mode
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_set_fade_step_and_start(ledc_mode_t speed_mode, ledc_channel_t channel, uint32_t target_duty, uint32_t scale, uint32_t cycle_num, ledc_fade_mode_t fade_mode);
/**
* @brief LEDC callback registration function
* @note The callback is called from an ISR, it must never attempt to block, and any FreeRTOS API called must be ISR capable.
* @param speed_mode Select the LEDC channel group with specified speed mode. Note that not all targets support high speed mode.
* @param channel LEDC channel index (0 - LEDC_CHANNEL_MAX-1), select from ledc_channel_t
* @param cbs Group of LEDC callback functions
* @param user_arg user registered data for the callback function
* @return
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_OK Success
* - ESP_ERR_INVALID_STATE Fade function not installed.
* - ESP_FAIL Fade function init error
*/
esp_err_t ledc_cb_register(ledc_mode_t speed_mode, ledc_channel_t channel, ledc_cbs_t *cbs, void *user_arg);
#ifdef __cplusplus
}
#endif
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