add example for encoding frame with user input (#330)

Author: ebroecker

examples/encodeFrame.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+
+import canmatrix.formats
+import sys
+import optparse
+
+# command line options...
+usage = """
+%prog [options]  matrix
+
+matrixX can be any of *.dbc|*.dbf|*.kcd|*.arxml
+"""
+
+parser = optparse.OptionParser(usage=usage)
+parser.add_option(
+    "-f", "--frames",
+    dest="frames",
+    help="encode list of frames",
+    default="*")
+
+(cmdlineOptions, args) = parser.parse_args()
+
+if len(args) < 1:
+    parser.print_help()
+    sys.exit(1)
+
+# load matrix
+db = canmatrix.formats.loadp(args[0], flat_import=True)
+
+#get all frames which match the commandline
+frames = db.glob_frames(cmdlineOptions.frames)
+
+#helper to read physical value from user
+def read_signal_value_from_user(signal):
+    a = input("Enter Value for " + signal.name + " ")
+
+    if signal.is_float:
+        return float(a)
+    else:
+        return int(a)
+
+# go through all frames
+for frame in frames:
+    print (frame.name)
+
+    if frame.is_complex_multiplexed:
+        # ignore complex multiplexed signals
+        continue
+    if frame.is_multiplexed:
+        # if multiplexed frame search for multiplexer
+        multiplexer_signal = None
+        for signal in frame.signals:
+            if signal.is_multiplexer:
+                multiplexer_signal = signal
+
+        signalDict = dict()
+
+        # read multiplexer value
+        a = input("Enter Value for Multiplexer " + multiplexer_signal.name + " ")
+        signalDict[multiplexer_signal.name] = int(a)
+
+        # read signals for the given multiplexer value
+        for signal in [s for s in frame.signals if (s.mux_val == int(a) or (s.mux_val is None and not s.is_multiplexer) )]:
+            signalDict[signal.name] = read_signal_value_from_user(signal)
+
+    else:
+        # not multiplexed frame
+        signalDict = dict()
+        # go through all signals
+        for signal in frame.signals:
+            signalDict[signal.name] = read_signal_value_from_user(signal)
+
+    frame_data = frame.encode(signalDict)
+    if frame.arbitration_id.extended:
+        print("{:05X}#".format(frame.arbitration_id.id) + "".join(["%02X" % i for i in frame_data]))
+    else:
+        print("{:03X}#".format(frame.arbitration_id.id) + "".join(["%02X" % i for i in frame_data]))