From c71d207e90153f32277ddbf1d2ab321ff315ae5b Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Mon, 17 Aug 2015 23:41:21 +0800
Subject: [PATCH] core/break_realtime: only increase now

---
 artiq/coredevice/core.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/artiq/coredevice/core.py b/artiq/coredevice/core.py
index 536a10054..79ba4d969 100644
--- a/artiq/coredevice/core.py
+++ b/artiq/coredevice/core.py
@@ -124,4 +124,6 @@ class Core:
 
     @kernel
     def break_realtime(self):
-        at_mu(syscall("rtio_get_counter") + 125000)
+        min_now = syscall("rtio_get_counter") + 125000
+        if now_mu() < min_now:
+            at_mu(min_now)