1 files changed, 31 insertions, 0 deletions
diff --git a/nuttx/arch/sim/src/up_idle.c b/nuttx/arch/sim/src/up_idle.c
index 84177f106..e83068713 100644
--- a/nuttx/arch/sim/src/up_idle.c
+++ b/nuttx/arch/sim/src/up_idle.c
@@ -39,6 +39,7 @@
 
 #include <nuttx/config.h>
 #include <sys/types.h>
+#include <time.h>
 #include <nuttx/arch.h>
 #include "up_internal.h"
 
@@ -50,6 +51,21 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_SIM_X11FB
+static int g_x11refresh = 0;
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#if defined(CONFIG_SIM_WALLTIME) || defined(CONFIG_SIM_X11FB)
+extern int up_hostusleep(unsigned int usec);
+#ifdef CONFIG_SIM_X11FB
+extern void up_x11update(void);
+#endif
+#endif
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -86,5 +102,20 @@ void up_idle(void)
 #if defined(CONFIG_NET) && defined(linux)
   uipdriver_loop();
 #endif
+
+  /* Wait a bit so that the sched_process_timer() is called close to the
+   * correct rate.
+   */
+
+#if defined(CONFIG_SIM_WALLTIME) || defined(CONFIG_SIM_X11FB)
+  (void)up_hostusleep(1000000 / CLK_TCK);
+#ifdef CONFIG_SIM_X11FB
+  g_x11refresh += 1000000 / CLK_TCK;
+  if (g_x11refresh > 500000)
+    {
+      up_x11update();
+    }
+#endif
+#endif
 }