🤖 Adds tensorflow lite micro lib

esp32/lib/tfmicro/tensorflow/lite/micro/micro_time.cc

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+/* Copyright 2020 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.
+==============================================================================*/
+
+// Reference implementation of timer functions.  Platforms are not required to
+// implement these timer methods, but they are required to enable profiling.
+
+// On platforms that have a POSIX stack or C library, it can be written using
+// methods from <sys/time.h> or clock() from <time.h>.
+
+// To add an equivalent function for your own platform, create your own
+// implementation file, and place it in a subfolder with named after the OS
+// you're targeting. For example, see the Cortex M bare metal version in
+// tensorflow/lite/micro/bluepill/micro_time.cc or the mbed one on
+// tensorflow/lite/micro/mbed/micro_time.cc.
+
+#include "tensorflow/lite/micro/micro_time.h"
+
+namespace tflite {
+
+// Reference implementation of the ticks_per_second() function that's required
+// for a platform to support Tensorflow Lite for Microcontrollers profiling.
+// This returns 0 by default because timing is an optional feature that builds
+// without errors on platforms that do not need it.
+int32_t ticks_per_second() { return 0; }
+
+// Reference implementation of the GetCurrentTimeTicks() function that's
+// required for a platform to support Tensorflow Lite for Microcontrollers
+// profiling. This returns 0 by default because timing is an optional feature
+// that builds without errors on platforms that do not need it.
+int32_t GetCurrentTimeTicks() { return 0; }
+
+}  // namespace tflite