Code to run FastLED on separate core

fastledtask.cpp

// ===== FastLED Show task ========================================

// -- The core to run FastLED.show()
#define FASTLED_SHOW_CORE 0

bool gShowOnOtherCore = true;

// -- Task handles for use in the notifications
static TaskHandle_t FastLEDshowTaskHandle = 0;
static TaskHandle_t userTaskHandle = 0;

/** show() for ESP32
    Call this function instead of FastLED.show(). It signals core 0 to issue a show,
    then waits for a notification that it is done.
*/
void FastLEDshowESP32()
{
  if ( ! gShowOnOtherCore) {
    FastLED.show();
  } else {
    if (userTaskHandle == 0) {
      //const TickType_t xMaxBlockTime = pdMS_TO_TICKS( 200 );
      // -- Store the handle of the current task, so that the show task can
      //    notify it when it's done
      userTaskHandle = xTaskGetCurrentTaskHandle();

      // -- Trigger the show task
      xTaskNotifyGive(FastLEDshowTaskHandle);

      // -- Wait to be notified that it's done
      ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
      userTaskHandle = 0;
    }
  }
}

/** show Task
    This function runs on core 0 and just waits for requests to call FastLED.show()
*/
void FastLEDshowTask(void *pvParameters)
{
  //const TickType_t xMaxBlockTime = pdMS_TO_TICKS( 500 );
  // -- Run forever...
  for (;;) {
    // -- Wait for the trigger
    ulTaskNotifyTake(pdTRUE, portMAX_DELAY);

    // -- Do the show (synchronously)
    uint32_t start = micros();
    FastLED.show();
    uint32_t finish = micros();

    // Serial.println(finish-start);

    // -- Notify the calling task
    xTaskNotifyGive(userTaskHandle);
  }
}

void setup()
{
  // -- Create the FastLED show task
  xTaskCreatePinnedToCore(FastLEDshowTask, "FastLEDshowTask", 2048, NULL, 2, &FastLEDshowTaskHandle, FASTLED_SHOW_CORE);  
}