X-Git-Url: http://sigrok.org/gitweb/?a=blobdiff_plain;f=decoders%2Fpwm%2Fpd.py;h=97704450b7701f5a01387f234eea6e9d16cc0a8e;hb=811167552c54668f6407ac640f8eb47a32980dd8;hp=2301523c1abd06923999aff4476b3ceae9c04a62;hpb=10aeb8ea8b183394cebc0033f048f49f4262b57d;p=libsigrokdecode.git

diff --git a/decoders/pwm/pd.py b/decoders/pwm/pd.py
index 2301523..9770445 100644
--- a/decoders/pwm/pd.py
+++ b/decoders/pwm/pd.py
@@ -20,6 +20,9 @@
 
 import sigrokdecode as srd
 
+class SamplerateError(Exception):
+    pass
+
 class Decoder(srd.Decoder):
     api_version = 3
     id = 'pwm'
@@ -52,6 +55,7 @@ class Decoder(srd.Decoder):
         self.reset()
 
     def reset(self):
+        self.samplerate = None
         self.ss_block = self.es_block = None
 
     def metadata(self, key, value):
@@ -89,6 +93,9 @@ class Decoder(srd.Decoder):
         self.put(self.ss_block, self.es_block, self.out_binary, data)
 
     def decode(self):
+        if not self.samplerate:
+            raise SamplerateError('Cannot decode without samplerate.')
+
         num_cycles = 0
         average = 0