X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=decoders%2Fusb_power_delivery%2Fpd.py;h=48db41b1a2155741b2d13aa662f1039e9d1db568;hp=da73661e0f7be604125a14242877a85156ae1cf6;hb=a1f66576f4b5e6d13edeb7319cae9c09679aafa4;hpb=2824e81140d3a8e37464f758cf67f50f2f7afca7

diff --git a/decoders/usb_power_delivery/pd.py b/decoders/usb_power_delivery/pd.py
index da73661..48db41b 100644
--- a/decoders/usb_power_delivery/pd.py
+++ b/decoders/usb_power_delivery/pd.py
@@ -178,6 +178,9 @@ VDM_CMDS = {
 }
 VDM_ACK = ['REQ', 'ACK', 'NAK', 'BSY']
 
+class SamplerateError(Exception):
+    pass
+
 class Decoder(srd.Decoder):
     api_version = 2
     id = 'usb_power_delivery'
@@ -436,7 +439,7 @@ class Decoder(srd.Decoder):
         self.putwarn('No start of packet found', 'XXX')
         return -1   # No Start Of Packet
 
-    def __init__(self, **kwargs):
+    def __init__(self):
         self.samplerate = None
         self.idx = 0
         self.packet_seq = 0
@@ -468,8 +471,6 @@ class Decoder(srd.Decoder):
         )
 
     def us2samples(self, us):
-        if not self.samplerate:
-            raise Exception('Need the samplerate.')
         return int(us * self.samplerate / 1000000)
 
     def decode_packet(self):
@@ -528,7 +529,7 @@ class Decoder(srd.Decoder):
 
     def decode(self, ss, es, data):
         if not self.samplerate:
-            raise Exception('Cannot decode without samplerate.')
+            raise SamplerateError('Cannot decode without samplerate.')
         for (self.samplenum, pins) in data:
             # find edges ...
             if self.oldpins == pins: