Sync from upstream TF. (#107)

tensorflow/lite/micro/hexagon/micro_time.cc

+/* Copyright 2021 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.
+==============================================================================*/
+// This file is empty to ensure that a specialized implementation of
+// micro_time.h is used (instead of the default implementation from
+// tensorflow/lite/micro/micro_time.cc).
+//
+// The actual target-specific implementation of micro_time.h is in
+// system_setup.cc since that allows us to consolidate all the target-specific
+// specializations into one source file.
+//
+//

tensorflow/lite/micro/hexagon/system_setup.cc

+/* Copyright 2021 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/micro/system_setup.h"
+
+#ifndef TF_LITE_STRIP_ERROR_STRINGS
+#include "q6sim_timer.h"  // NOLINT
+#endif                    // TF_LITE_STRIP_ERROR_STRINGS
+
+#include "tensorflow/lite/micro/debug_log.h"
+#include "tensorflow/lite/micro/micro_time.h"
+
+namespace tflite {
+
+// Calling this method enables a timer that runs for eternity.
+void InitializeTarget() {
+#ifndef TF_LITE_STRIP_ERROR_STRINGS
+  hexagon_sim_init_timer();
+  hexagon_sim_start_timer();
+#endif  // TF_LITE_STRIP_ERROR_STRINGS
+}
+
+int32_t ticks_per_second() { return 1000000; }
+
+int32_t GetCurrentTimeTicks() {
+#ifndef TF_LITE_STRIP_ERROR_STRINGS
+  return hexagon_sim_read_cycles();
+#else
+  return 0;
+#endif  // TF_LITE_STRIP_ERROR_STRINGS
+}
+
+}  // namespace tflite

tensorflow/lite/micro/tools/project_generation/Makefile

@@ -31,6 +31,8 @@ INCLUDES := \
   -I. \
   -I./third_party/gemmlowp \
   -I./third_party/flatbuffers/include \
+  -I./third_party/kissfft \
+  -I./third_party/kissfft/tools \
   -I./third_party/ruy
 
 AR := ar