srd: Pass metadata to decoders only on SR_DF_HEADER.

Before this was passed to the decoder's constuctor, but the parameters
may not all be known at construction.  Decoders now have a method start()
which is called at the start of the capture, and metadata is passed as
an arg to this function.

1 files changed, 4 insertions, 5 deletions

diff --git a/decoders/spi.py b/decoders/spi.py
index 7b3d8ab..731c77c 100644
--- a/decoders/spi.py
+++ b/decoders/spi.py
@@ -43,17 +43,16 @@ class Decoder():
     probes = {'sdata':0, 'sck':1}
     options = {}
 
-    def __init__(self, unitsize, **kwargs):
-        # Metadata comes in here, we don't care for now
-        #print kwargs
-        self.unitsize = unitsize
-
+    def __init__(self):
         self.probes = Decoder.probes.copy()
         self.oldsck = True
         self.rxcount = 0
         self.rxdata = 0
         self.bytesreceived = 0
 
+    def start(self, metadata):
+        self.unitsize = metadata["unitsize"]
+
     def report(self):
         return "SPI: %d bytes received" % self.bytesreceived