name = 'USB'
longname = 'Universal Serial Bus'
desc = 'Universal Serial Bus'
- longdesc = '...longdesc...'
license = 'gplv2+'
inputs = ['logic']
outputs = ['usb']
pass
def start(self, metadata):
- self.rate = metadata['samplerate']
+ self.samplerate = metadata['samplerate']
# self.out_proto = self.add(srd.OUTPUT_PROTO, 'usb')
self.out_ann = self.add(srd.OUTPUT_ANN, 'usb')
- if self.rate < 48000000:
- raise Exception('Sample rate (%d) not sufficient for USB '
- 'decoding, need at least 48MHz' % self.rate)
+ if self.samplerate < 48000000:
+ raise Exception('Samplerate (%d) not sufficient for USB '
+ 'decoding, need at least 48MHz' % self.samplerate)
# Initialise decoder state.
self.sym = 'J'
- self.scount = 0
+ self.samplenum = 0
self.packet = ''
def report(self):
pass
def decode(self, ss, es, data):
- for (samplenum, (dm, dp)) in data:
-
- self.scount += 1
+ for (self.samplenum, (dm, dp)) in data:
sym = syms[dp, dm]
if sym == self.sym:
continue
- if self.scount == 1:
+ if self.samplenum == 1:
# We ignore single sample width pulses.
# I sometimes get these with the OLS.
self.sym = sym
- self.scount = 0
+ self.samplenum = 0
continue
# How many bits since the last transition?
if self.packet != '' or self.sym != 'J':
- bitcount = int((self.scount - 1) * 12000000 / self.rate)
+ bitcount = int((self.samplenum - 1) * 12000000 / self.samplerate)
else:
bitcount = 0
else:
# Longer than EOP, assume reset.
self.put(0, 0, self.out_ann, [0, ['RESET']])
- self.scount = 0
+ self.samplenum = 0
self.sym = sym
self.packet = ''
continue
elif bitcount > 6:
self.put(0, 0, self.out_ann, [0, ['BIT STUFF ERROR']])
- self.scount = 0
+ self.samplenum = 0
self.sym = sym