AP_HAL: added RCOutput example sketch

useful for testing all 14 channels via APM API

libraries/AP_HAL/examples/RCOutput/Makefile

@@ -0,0 +1 @@
+include ../../../../mk/apm.mk

libraries/AP_HAL/examples/RCOutput/RCOutput.pde

@@ -0,0 +1,38 @@
+
+#include <AP_Common.h>
+#include <AP_Math.h>
+#include <AP_Param.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>
+
+const AP_HAL::HAL& hal = AP_HAL_BOARD_DRIVER;
+
+void setup (void) 
+{
+    hal.console->printf_P(PSTR("Starting AP_HAL::RCOutput test\r\n"));
+    uint8_t i;
+
+    hal.console->printf_P(PSTR("Testing 14 channels 1050+i*50\n"));
+    for (i=0; i<14; i++) {
+        hal.rcout->enable_ch(i);
+        hal.rcout->write(i, 1050 + i*50);
+    }
+    hal.rcout->set_freq(0xFF, 490);
+}
+
+void loop (void) 
+{
+    uint8_t i;
+    for (i=0; i<14; i++) {
+        hal.rcout->enable_ch(i);
+        hal.rcout->write(i, 1050 + i*50);
+    }
+    hal.scheduler->delay(10);
+}
+
+AP_HAL_MAIN();