AP_HAL: add Random Number Generation test

libraries/AP_HAL/examples/RNG_test/RNG_test.cpp

@@ -0,0 +1,27 @@
+/*
+  simple test of Random Number Generation
+ */
+
+#include <AP_HAL/AP_HAL.h>
+
+void setup();
+void loop();
+
+const AP_HAL::HAL& hal = AP_HAL::get_HAL();
+
+void setup(void) {
+    hal.console->printf("Running Random Number Generator Test!\n");
+}
+
+void loop(void)
+{
+    uint32_t random_number;
+    if (hal.util->get_random_vals((uint8_t*)&random_number, sizeof(random_number))) {
+        hal.console->printf("RNG %lx\n", (unsigned long)random_number);
+    } else {
+        hal.console->printf("RNG failed\n");
+    }
+    hal.scheduler->delay(1000);
+}
+
+AP_HAL_MAIN();

libraries/AP_HAL/examples/RNG_test/wscript

@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+def build(bld):
+    bld.ap_example(
+        use='ap',
+    )