Added notify_start() to indicate test start

Added BusOut test

libraries/tests/mbed/bus/main.cpp

@@ -0,0 +1,19 @@
+#include "mbed.h"
+#include "test_env.h"
+
+BusOut bus1(D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15);
+BusOut bus2(A5, A4, A3, A2, A1, A0);
+int i;
+ 
+int main()
+{
+    notify_start();
+    
+    for (i=0; i<=65535; i++) {
+        bus1 = i;
+        bus2 = i;
+        wait(0.0001);
+    }
+    
+    notify_completion(true);
+}

libraries/tests/mbed/env/test_env.cpp

@@ -11,6 +11,10 @@ void led_blink(PinName led, float delay) {
     while(1);
 }
 
+void notify_start() {
+    printf("{{start}}" NL);
+}
+
 void notify_completion(bool success) {
     if (success) {
         printf("{{success}}" NL);

libraries/tests/mbed/env/test_env.h

@@ -8,6 +8,8 @@
 
 void led_blink(PinName led, float delay);
 
+void notify_start();
+
 void notify_completion(bool success);
 
 #endif

workspace_tools/tests.py

@@ -252,6 +252,13 @@ TESTS = [
         "dependencies": [MBED_LIBRARIES, TEST_MBED_LIB],
         "automated": False,
     },
+    {
+        "id": "MBED_BUS", "description": "Blinky BUS",
+        "source_dir": join(TEST_DIR, "mbed", "bus"),
+        "dependencies": [MBED_LIBRARIES, TEST_MBED_LIB],
+        "automated": False,
+        "duration": 15,
+    },
 
     # Size benchmarks
     {