<value>: integer
'''
-class SamplerateError(Exception):
- pass
-
class Decoder(srd.Decoder):
api_version = 3
id = 'i2s'
license = 'gplv2+'
inputs = ['logic']
outputs = ['i2s']
+ tags = ['Audio', 'PC']
channels = (
{'id': 'sck', 'name': 'SCK', 'desc': 'Bit clock line'},
{'id': 'ws', 'name': 'WS', 'desc': 'Word select line'},
)
def __init__(self):
+ self.reset()
+
+ def reset(self):
self.samplerate = None
self.oldws = 1
self.bitcount = 0
self.put(self.ss_block, self.samplenum, self.out_ann, data)
def report(self):
-
# Calculate the sample rate.
samplerate = '?'
if self.ss_block is not None and \
self.first_sample is not None and \
- self.ss_block > self.first_sample:
+ self.ss_block > self.first_sample and \
+ self.samplerate:
samplerate = '%d' % (self.samplesreceived *
self.samplerate / (self.ss_block -
self.first_sample))
return struct.pack('<I', self.data)
def decode(self):
- if not self.samplerate:
- raise SamplerateError('Cannot decode without samplerate.')
while True:
# Wait for a rising edge on the SCK pin.
sck, ws, sd = self.wait({0: 'r'})
self.samplesreceived += 1
- 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'
+ sck = self.wait({0: 'f'})
+
+ idx = 0 if not self.oldws else 1
+ c1 = 'Left channel' if not self.oldws else 'Right channel'
+ c2 = 'Left' if not self.oldws else 'Right'
+ c3 = 'L' if not 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),
'word' % (self.bitcount, self.wordlength)]])
self.wordlength = self.bitcount
+ else:
+ sck = self.wait({0: 'f'})
# Reset decoder state.
self.data = 0