From: Uwe Hermann <redacted>
Date: Mon, 11 Aug 2014 20:53:35 +0000 (+0200)
Subject: parallel: Enforce that at least one pin must be provided.
X-Git-Tag: libsigrokdecode-0.4.0~196
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commitdiff_plain;h=a573d3944c410d90adb5130323e0f3792d9ae201

parallel: Enforce that at least one pin must be provided.
---

diff --git a/decoders/parallel/pd.py b/decoders/parallel/pd.py
index a695ca6..cafaefc 100644
--- a/decoders/parallel/pd.py
+++ b/decoders/parallel/pd.py
@@ -61,6 +61,9 @@ def channel_list(num_channels):
         l.append(d)
     return tuple(l)
 
+class ChannelError(Exception):
+    pass
+
 class Decoder(srd.Decoder):
     api_version = 2
     id = 'parallel'
@@ -180,6 +183,9 @@ class Decoder(srd.Decoder):
                 continue
             self.oldpins = pins
 
+            if sum(1 for p in pins if p in (0, 1)) == 0:
+                raise ChannelError('At least one channel has to be supplied.')
+
             if pins[0] not in (0, 1):
                 self.handle_bits(pins[1:])
             else: