OPUS20: strict 5s interval for scanning

diff --git a/LUFFT_OPUS20/lufft_opus20_driver.py b/LUFFT_OPUS20/lufft_opus20_driver.py
index 546faacaa0d1764ff575fc40e450214fea5c7018..56a21d8b48e1e3637ded409257dbf8c8fbf1b74a 100644 (file)
--- 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