import sigrokdecode as srd
-# Annotation formats
-ANN_HEX = 0
+'''
+Protocol output format:
+
+Packet:
+[<ptype>, <pdata>]
+
+<ptype>, <pdata>:
+ - 'DATA', [<channel>, <value>]
+
+<channel>: 'L' or 'R'
+<value>: integer
+'''
class Decoder(srd.Decoder):
api_version = 1
optional_probes = []
options = {}
annotations = [
- ['Hex', 'Annotations in hex format'],
+ ['left', 'Left channel'],
+ ['right', 'Right channel'],
+ ['warnings', 'Warnings'],
]
def __init__(self, **kwargs):
+ self.samplerate = None
self.oldsck = 1
self.oldws = 1
self.bitcount = 0
self.samplesreceived = 0
self.first_sample = None
self.start_sample = None
- self.samplenum = -1
self.wordlength = -1
- def start(self, metadata):
- self.samplerate = metadata['samplerate']
- self.out_proto = self.add(srd.OUTPUT_PROTO, 'i2s')
- self.out_ann = self.add(srd.OUTPUT_ANN, 'i2s')
+ def start(self):
+ self.out_proto = self.register(srd.OUTPUT_PYTHON)
+ self.out_ann = self.register(srd.OUTPUT_ANN)
+
+ 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)
+
+ def putb(self, data):
+ self.put(self.start_sample, self.samplenum, self.out_ann, data)
def report(self):
(self.samplesreceived, self.wordlength, samplerate)
def decode(self, ss, es, data):
- for samplenum, (sck, ws, sd) in 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.
if sck == self.oldsck:
# Only submit the sample, if we received the beginning of it.
if self.start_sample != None:
self.samplesreceived += 1
- self.put(self.start_sample, self.samplenum, self.out_proto,
- ['data', self.data])
- self.put(self.start_sample, self.samplenum, self.out_ann,
- [ANN_HEX, ['%s: 0x%08x' % ('L' if self.oldws else 'R',
- 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:
- self.put(self.start_sample, self.samplenum, self.out_ann,
- [ANN_HEX, ['WARNING: Received a %d-bit word, when a '
- '%d-bit word was expected' % (self.bitcount,
- self.wordlength)]])
+ self.putb([2, ['Received %d-bit word, expected %d-bit '
+ 'word' % (self.bitcount, self.wordlength)]])
self.wordlength = self.bitcount