New ScreenPanel

script/TestRecordNull.py

@@ -0,0 +1,39 @@
+index = 0
+class AnalogInput(ReadonlyRegisterBase):
+    def doRead(self):
+        global index
+        index = index+1
+        if index<5: 
+            return None
+        return sin.read()
+
+class Waveform(ReadonlyRegisterBase, ReadonlyRegisterArray):
+    def doRead(self):
+        global index
+        index = index+1
+        if index<5: 
+            return None
+        return arr.read()
+
+    def getSize(self):
+        return arr.size 
+
+class Image(ReadonlyRegisterBase, ReadonlyRegisterMatrix):
+    def doRead(self):
+        global index
+        index = index+1
+        if index<5: 
+            return None
+        return matrix.read()
+
+    def getWidth(self):
+         return matrix.width
+
+    def getHeight(self):
+         return matrix.height 
+
+add_device(AnalogInput("tst"), True)
+add_device(Waveform("tst2"), True)
+add_device(Image("tst3"), True)
+
+tscan(tst3, 10, 0.1)