HAL_PX4: update simple example

libraries/AP_HAL_PX4/examples/simple/simple.pde

@@ -1,25 +1,38 @@
+/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*-
+
+/*
+  simple hello world sketch
+  Andrew Tridgell September 2011
+*/
 
 #include <AP_Common.h>
 #include <AP_Progmem.h>
 #include <AP_HAL.h>
+#include <AP_HAL_AVR.h>
+#include <AP_HAL_AVR_SITL.h>
 #include <AP_HAL_PX4.h>
+#include <AP_HAL_Empty.h>
+#include <AP_Math.h>
+#include <Filter.h>
+#include <AP_InertialSensor.h>
+#include <AP_ADC.h>
+#include <GCS_MAVLink.h>
+#include <AP_Param.h>
+#include <AP_Baro.h>
+#include <AP_Compass.h>
+#include <AP_Declination.h>
+#include <SITL.h>
 
-const AP_HAL::HAL& hal = AP_HAL_PX4_Instance;
+const AP_HAL::HAL& hal = AP_HAL_BOARD_DRIVER;
 
-void loop (void) {
-    hal.console->println(".");
+void setup() {
+	hal.console->println_P(PSTR("hello world"));
 }
 
-void setup (void) {
-    hal.console->println("Hello World");
+void loop()
+{
+	hal.scheduler->delay(1000);
+	hal.console->println("*");
 }
 
-
-extern "C" {
-int main (void) {
-    hal.init(NULL);
-    setup();
-    for(;;) loop();
-    return 0;
-}
-}
+AP_HAL_MAIN();