tests/pkg_tensorflow-lite: add sample application

tests/pkg_tensorflow-lite/Makefile

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+# Ensure minimal size by default
+DEVELHELP ?= 0
+
+include ../Makefile.tests_common
+
+EXAMPLE ?= hello_world
+
+USEPKG += tensorflow-lite
+USEMODULE += tensorflow-lite-$(EXAMPLE)
+
+include $(RIOTBASE)/Makefile.include

tests/pkg_tensorflow-lite/README.md

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+TensorFlow Lite sample application
+==================================
+
+This application is taken as-is from the hello-world sample
+application of TensorFlow Lite for microcontrollers.
+
+The original code is
+[available on GitHub](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/lite/experimental/micro/examples/hello_world).
+
+This application simply replicates a `sine` function from a trained model.
+
+To get started with TensorFlow Lite on microcontrollers, please refer to
+[this page](https://www.tensorflow.org/lite/microcontrollers).
+
+Usage
+-----
+
+Simply run the application on the board of your choice using:
+
+    make BOARD=<board of your choice> -C tests/pkg_tensorflow-lite flash term
+
+Then type 's' to start the application.
+
+Expected result
+---------------
+
+The application prints the values of the `sine` function:
+```
+x_value: 1.0*2^-127, y_value: 1.9783614*2^-8
+
+x_value: 1.2566366*2^-2, y_value: 1.3910355*2^-2
+
+x_value: 1.2566366*2^-1, y_value: 1.1282844*2^-1
+
+x_value: 1.8849551*2^-1, y_value: 1.5455950*2^-1
+
+x_value: 1.2566366*2^0, y_value: 1.8238020*2^-1
+
+x_value: 1.5707957*2^0, y_value: 1.8701699*2^-1
+
+x_value: 1.8849551*2^0, y_value: 1.8547139*2^-1
+
+x_value: 1.995567*2^1, y_value: 1.4683149*2^-1
+
+x_value: 1.2566366*2^1, y_value: 1.1128282*2^-1
+
+x_value: 1.4137159*2^1, y_value: 1.819164*2^-2
+
+x_value: 1.5707957*2^1, y_value: -1.2364758*2^-5
+
+x_value: 1.7278753*2^1, y_value: -1.6074185*2^-2
+
+x_value: 1.8849551*2^1, y_value: -1.2982997*2^-1
+
+x_value: 1.210171*2^2, y_value: -1.7928901*2^-1
+
+x_value: 1.995567*2^2, y_value: -1.46367*2^0
+
+x_value: 1.1780966*2^2, y_value: -1.46367*2^0
+```

tests/pkg_tensorflow-lite/main.cpp

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+/*
+ * Copyright (C) 2019 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ *
+ * @file
+ * @brief       TensorFlow Lite test application
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ */
+
+/* Provide an Arduino-Like API to be able to easily reuse the code from
+   upstream examples */
+void setup();
+void loop();
+
+int main(int argc, char* argv[])
+{
+    (void)argc;
+    (void)argv;
+
+    setup();
+
+    while (true) {
+      loop();
+    }
+}

tests/pkg_tensorflow-lite/tests/01-run.py

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+#!/usr/bin/env python3
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    pass
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))