From d16daf5ba4c7d8c08ce48b6169c31ec1754e3ada Mon Sep 17 00:00:00 2001
From: Daniel Agar <daniel@agar.ca>
Date: Wed, 15 Jun 2016 14:29:19 -0400
Subject: [PATCH] pwm_out_sim sleep if no fds (#4829)

-fixes #4828
---
 src/drivers/pwm_out_sim/pwm_out_sim.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/drivers/pwm_out_sim/pwm_out_sim.cpp b/src/drivers/pwm_out_sim/pwm_out_sim.cpp
index d3cb5b2542..af264d966c 100644
--- a/src/drivers/pwm_out_sim/pwm_out_sim.cpp
+++ b/src/drivers/pwm_out_sim/pwm_out_sim.cpp
@@ -414,7 +414,10 @@ PWMSim::task_main()
 			_current_update_rate = _update_rate;
 		}
 
+		/* this can happen during boot, but after the sleep its likely resolved */
 		if (_poll_fds_num == 0) {
+			usleep(1000 * 1000);
+
 			PX4_DEBUG("no valid fds");
 			continue;
 		}