Method _timerShotTask

examples/WebCamServer/ESP32Cam.cpp:627–651

* The timer shot task operation runs as a task generated by the interrupt * routine. It reserves a semaphore in the first phase of the function to avoid * conflicting image sensor access with other tasks. The secured semaphore will * not be released until the captured image is exported to SD. In addition, the * timer will also stop temporarily. * @param pvParameters Current instance of ESP3

 * @param  pvParameters  Current instance of ESP32Cam
 */
void ESP32Cam::_timerShotTask(void* pvParametes) {
  // Take a Mutex that avoids contention for image sensor resources.
  if (enq(portMAX_DELAY) == pdTRUE) {

    // Receive current instance of ESP32Cam
    ESP32Cam* esp32cam = reinterpret_cast<ESP32Cam*>(pvParametes);

    // Temporarily stop the timer during execution to suppress task overlap.
    timerStop(esp32cam->_hwTimer);

    // Assemble the file name of the destination of the captured image.
    char  fn[esp32cam->_captureName.length() + sizeof('\0') + 20];
    strcpy(fn, esp32cam->_captureName.c_str());
    esp32cam->_appendTimestamp(fn);

    // Capture and export to SD
    esp32cam->_export(fn, nullptr);

    // Release the resource and restart the timer increment.
    timerStart(esp32cam->_hwTimer);
    deq();
    // Purge itself
    vTaskDelete(NULL);
  }
}

/**
 * Temporarily stops the timerShot cycle.