[feat][tensorflow] add tensorflow demo

examples/tensorflow/main_functions.h

@@ -0,0 +1,38 @@
+//  Based on https://github.com/lupyuen/tflite-bl602/blob/main/tensorflow/lite/micro/examples/hello_world/main_functions.h
+/* Copyright 2019 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.
+==============================================================================*/
+
+#ifndef TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MAIN_FUNCTIONS_H_
+#define TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MAIN_FUNCTIONS_H_
+
+// Expose a C friendly interface for main functions.
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Initializes all data needed for the example. The name is important, and needs
+// to be setup() for Arduino compatibility.
+void setup();
+
+// Runs one iteration of data gathering and inference. This should be called
+// repeatedly from the application code. The name needs to be loop() for Arduino
+// compatibility.
+void loop();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // TENSORFLOW_LITE_MICRO_EXAMPLES_HELLO_WORLD_MAIN_FUNCTIONS_H_