##
import sigrokdecode as srd
+import struct
'''
OUTPUT_PYTHON format:
<value>: integer
'''
-class SamplerateError(Exception):
- pass
-
class Decoder(srd.Decoder):
api_version = 3
id = 'i2s'
)
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))
h += b'\x01\x00' # Audio format (0x0001 == PCM)
h += b'\x02\x00' # Number of channels (2)
h += b'\x80\x3e\x00\x00' # Samplerate (16000)
- h += b'\x00\x7d\x00\x00' # Byterate (32000)
+ h += b'\x00\xfa\x00\x00' # Byterate (64000)
h += b'\x04\x00' # Blockalign (4)
- h += b'\x10\x00' # Bits per sample (16)
+ h += b'\x20\x00' # Bits per sample (32)
# Data subchunk
h += b'data'
- h += b'\xff\xff\x00\x00' # Subchunk size (65535 bytes) TODO
+ h += b'\xff\xff\xff\xff' # Subchunk size (4G bytes) TODO
return h
def wav_sample(self, sample):
- # TODO: This currently assumes U32 samples, and converts to S16.
- s = sample >> 16
- if s >= 0x8000:
- s -= 0x10000
- lo, hi = s & 0xff, (s >> 8) & 0xff
- return bytes([lo, hi])
+ 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'})