X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=blobdiff_plain;f=decoders%2Fi2s%2Fpd.py;h=292a4c48ebbd1af8e51816271270d7ac9cf2dfe9;hp=b1f36caba7d927925dfcfbd4e7809c10bc6f6932;hb=f2a5df42ea41e6c4370d4efa1a27ab942ba1ddff;hpb=2b2b7c300e6771ac6aa2982ced109ef3f02f3636

diff --git a/decoders/i2s/pd.py b/decoders/i2s/pd.py
index b1f36ca..292a4c4 100644
--- a/decoders/i2s/pd.py
+++ b/decoders/i2s/pd.py
@@ -22,6 +22,19 @@
 
 import sigrokdecode as srd
 
+'''
+Protocol output format:
+
+Packet:
+[<ptype>, <pdata>]
+
+<ptype>, <pdata>:
+ - 'DATA', [<channel>, <value>]
+
+<channel>: 'L' or 'R'
+<value>: integer
+'''
+
 class Decoder(srd.Decoder):
     api_version = 1
     id = 'i2s'
@@ -45,6 +58,7 @@ class Decoder(srd.Decoder):
     ]
 
     def __init__(self, **kwargs):
+        self.samplerate = None
         self.oldsck = 1
         self.oldws = 1
         self.bitcount = 0
@@ -54,11 +68,14 @@ class Decoder(srd.Decoder):
         self.start_sample = None
         self.wordlength = -1
 
-    def start(self, metadata):
-        self.samplerate = metadata['samplerate']
-        self.out_proto = self.add(srd.OUTPUT_PROTO, 'i2s')
+    def start(self):
+        self.out_proto = self.add(srd.OUTPUT_PYTHON, 'i2s')
         self.out_ann = self.add(srd.OUTPUT_ANN, 'i2s')
 
+    def metadata(self, key, value):
+        if key == srd.SRD_CONF_SAMPLERATE:
+            self.samplerate = value
+
     def putpb(self, data):
         self.put(self.start_sample, self.samplenum, self.out_proto, data)
 
@@ -80,6 +97,8 @@ class Decoder(srd.Decoder):
             (self.samplesreceived, self.wordlength, samplerate)
 
     def decode(self, ss, es, data):
+        if self.samplerate is None:
+            raise Exception("Cannot decode without samplerate.")
         for self.samplenum, (sck, ws, sd) in data:
 
             # Ignore sample if the bit clock hasn't changed.
@@ -100,8 +119,15 @@ class Decoder(srd.Decoder):
             # Only submit the sample, if we received the beginning of it.
             if self.start_sample != None:
                 self.samplesreceived += 1
-                self.putpb(['data', self.data])
-                self.putb([0 if self.oldws else 1, ['0x%08x' % self.data]])
+
+                idx = 0 if self.oldws else 1
+                c1 = 'Left channel' if self.oldws else 'Right channel'
+                c2 = 'Left' if self.oldws else 'Right'
+                c3 = 'L' if self.oldws else 'R'
+                v = '%08x' % self.data
+                self.putpb(['DATA', [c3, self.data]])
+                self.putb([idx, ['%s: %s' % (c1, v), '%s: %s' % (c2, v),
+                                 '%s: %s' % (c3, v), c3]])
 
                 # Check that the data word was the correct length.
                 if self.wordlength != -1 and self.wordlength != self.bitcount: