X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=decoders%2Fpwm%2Fpd.py;h=d8626ee00824d427a53672e76b298e84f9233191;hp=444b4179cb55ac00e337bb791c10ac6c14da1e3c;hb=6cbba91f23b9f9ace75b4722c9c0776b9211008d;hpb=0e48cad63eda6af83771cace3d1ed2a0f14c9474

diff --git a/decoders/pwm/pd.py b/decoders/pwm/pd.py
index 444b417..d8626ee 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'
@@ -28,7 +31,8 @@ class Decoder(srd.Decoder):
     desc = 'Analog level encoded in duty cycle percentage.'
     license = 'gplv2+'
     inputs = ['logic']
-    outputs = ['pwm']
+    outputs = []
+    tags = ['Encoding']
     channels = (
         {'id': 'data', 'name': 'Data', 'desc': 'Data line'},
     )
@@ -49,6 +53,10 @@ class Decoder(srd.Decoder):
     )
 
     def __init__(self):
+        self.reset()
+
+    def reset(self):
+        self.samplerate = None
         self.ss_block = self.es_block = None
 
     def metadata(self, key, value):
@@ -86,6 +94,9 @@ 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