/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.

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.
==============================================================================*/

#include "tensorflow/lite/experimental/micro/debug_log.h"

#include "Arduino.h"

// The Arduino DUE uses a different object for the default serial port shown in
// the monitor than most other models, so make sure we pick the right one. See
// https://github.com/arduino/Arduino/issues/3088#issuecomment-406655244
#if defined(__SAM3X8E__)
#define DEBUG_SERIAL_OBJECT (SerialUSB)
#else
#define DEBUG_SERIAL_OBJECT (Serial)
#endif

// On Arduino platforms, we set up a serial port and write to it for debug
// logging.
extern "C" void DebugLog(const char* s) {
  static bool is_initialized = false;
  if (!is_initialized) {
    DEBUG_SERIAL_OBJECT.begin(9600);
    // Wait for serial port to connect. Only needed for some models apparently?
    while (!DEBUG_SERIAL_OBJECT) {
    }
    is_initialized = true;
  }
  DEBUG_SERIAL_OBJECT.println(s);
}
