All PDs: Drop unneeded comments.

[libsigrokdecode.git] / decoders / can / pd.py

diff --git a/decoders/can/pd.py b/decoders/can/pd.py
index 61b0a744cacb217f56a3ded29e95f6db9e49c5f9..13a4b24ea38ef24f826a5a324a432804fb75a1bb 100644 (file)
--- a/decoders/can/pd.py
+++ b/decoders/can/pd.py
@@ -18,8 +18,6 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
-# CAN protocol decoder
-
 import sigrokdecode as srd
 
 class Decoder(srd.Decoder):
@@ -60,18 +58,18 @@ class Decoder(srd.Decoder):
     ]
 
     def __init__(self, **kwargs):
+        self.samplerate = None
         self.reset_variables()
 
-    def start(self, metadata):
-        # self.out_proto = self.add(srd.OUTPUT_PROTO, 'can')
-        self.out_ann = self.add(srd.OUTPUT_ANN, 'can')
-
-        self.samplerate = metadata['samplerate']
-        self.bit_width = float(self.samplerate) / float(self.options['bitrate'])
-        self.bitpos = (self.bit_width / 100.0) * self.options['sample_point']
+    def start(self):
+        # self.out_proto = self.register(srd.OUTPUT_PYTHON)
+        self.out_ann = self.register(srd.OUTPUT_ANN)
 
-    def report(self):
-        pass
+    def metadata(self, key, value):
+        if key == srd.SRD_CONF_SAMPLERATE:
+            self.samplerate = value
+            self.bit_width = float(self.samplerate) / float(self.options['bitrate'])
+            self.bitpos = (self.bit_width / 100.0) * self.options['sample_point']
 
     # Generic helper for CAN bit annotations.
     def putg(self, ss, es, data):
@@ -362,6 +360,8 @@ class Decoder(srd.Decoder):
         self.curbit += 1
 
     def decode(self, ss, es, data):
+        if self.samplerate is None:
+            raise Exception("Cannot decode without samplerate.")
         for (self.samplenum, pins) in data:
 
             (can_rx,) = pins