cc3200: Change HeartBeat period from 5 to 4 seconds.

cc3200/misc/mperror.c

@@ -59,7 +59,7 @@
 #define MPERROR_TOOGLE_MS                           (40)
 #define MPERROR_SIGNAL_ERROR_MS                     (1000)
 #define MPERROR_HEARTBEAT_ON_MS                     (80)
-#define MPERROR_HEARTBEAT_OFF_MS                    (4920)
+#define MPERROR_HEARTBEAT_OFF_MS                    (3920)
 
 /******************************************************************************
  DECLARE PRIVATE DATA

docs/wipy/general.rst

@@ -88,7 +88,7 @@ the latest firmware will run again.
 The heart beat LED
 ------------------
 
-By default the heart beat LED flashes once every 5s to signal that the system is
+By default the heart beat LED flashes once every 4s to signal that the system is
 alive. This can be overridden through the HeartBeat class:
 
 ``pyb.HeartBeat().disable()``