From: Philipp Klaus <klaus@physik.uni-frankfurt.de>
Date: Thu, 10 Aug 2017 11:59:33 +0000 (+0200)
Subject: OPUS20: strict 5s interval for scanning
X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=94d2899d5cabb93638f882a0b118fad678e15c69;p=mvd_epics.git

OPUS20: strict 5s interval for scanning
---

diff --git a/LUFFT_OPUS20/lufft_opus20_driver.py b/LUFFT_OPUS20/lufft_opus20_driver.py
index 546faac..56a21d8 100644
--- a/LUFFT_OPUS20/lufft_opus20_driver.py
+++ b/LUFFT_OPUS20/lufft_opus20_driver.py
@@ -27,8 +27,8 @@ class Opus20Driver(Driver):
             self.tid.start()
 
     def scan_all(self):
+        last_time = time.time()
         while True:
-            start = time.time()
 
             mapping = [
                 ('Temperature',       0x0064),
@@ -51,4 +51,9 @@ class Opus20Driver(Driver):
                 else:
                     self.setParamStatus(reason, Alarm.COMM_ALARM, Severity.MINOR_ALARM)
 
-            time.sleep(self.scan_period - (time.time() - start))
+            # if the process was suspended, reset last_time:
+            if time.time() - last_time > self.scan_period:
+                last_time = time.time()
+
+            time.sleep(max(0.0, self.scan_period - (time.time() - last_time)))
+            last_time += self.scan_period