Function esp_idf_svc::sys::ledc_fade_start

pub unsafe extern "C" fn ledc_fade_start(
    speed_mode: u32,
    channel: u32,
    fade_mode: u32,
) -> i32

@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 Channel not initialized or fade function not installed. - ESP_ERR_INVALID_ARG Parameter error.