diff options
Diffstat (limited to 'decoders/onewire/onewire.py')
| -rw-r--r-- | decoders/onewire/onewire.py | 82 |
1 files changed, 48 insertions, 34 deletions
diff --git a/decoders/onewire/onewire.py b/decoders/onewire/onewire.py index 92cc7dc..24d265b 100644 --- a/decoders/onewire/onewire.py +++ b/decoders/onewire/onewire.py @@ -55,31 +55,23 @@ class Decoder(srd.Decoder): ['Bits', 'Data bytes in bit notation (sequence of 0/1 digits)'], ] - def putx(self, data): - self.put(self.startsample, self.samplenum - 1, self.out_ann, data) - def __init__(self, **kwargs): # Common variables self.samplenum = 0 # Link layer variables - self.lnk_state = 'WAIT FOR NEGEDGE' - self.lnk_event = 'NONE' - self.lnk_start = -1 - self.lnk_bit = -1 - self.lnk_cnt = 0 - self.lnk_byte = -1 + self.lnk_state = 'WAIT FOR FALLING EDGE' + self.lnk_event = 'NONE' + self.lnk_fall = 0 + self.lnk_present = 0 + self.lnk_bit = 0 # Network layer variables - self.net_state = 'WAIT FOR EVENT' - self.net_event = 'NONE' - self.net_command = -1 + self.net_state = 'WAIT FOR COMMAND' + self.net_event = 'NONE' + self.net_cnt = 0 + self.net_cmd = 0 # Transport layer variables - self.trn_state = 'WAIT FOR EVENT' - self.trn_event = 'NONE' - - self.data_sample = -1 - self.cur_data_bit = 0 - self.databyte = 0 - self.startsample = -1 + self.trn_state = 'WAIT FOR EVENT' + self.trn_event = 'NONE' def start(self, metadata): self.samplerate = metadata['samplerate'] @@ -88,18 +80,20 @@ class Decoder(srd.Decoder): # The width of the 1-Wire time base (30us) in number of samples. # TODO: optimize this value - self.time_base = float(self.samplerate) / float(0.000030) + self.time_base = float(self.samplerate) * float(0.000030) + print ("DEBUG: samplerate = %d, time_base = %d" % (self.samplerate, self.time_base)) def report(self): pass def decode(self, ss, es, data): - for (self.samplenum, owr) in data: + for (self.samplenum, (owr, pwr)) in data: +# print ("DEBUG: sample = %d, owr = %d, pwr = %d, lnk_fall = %d, lnk_state = %s" % (self.samplenum, owr, pwr, self.lnk_fall, self.lnk_state)) # Data link layer # Clear events. - self.lnk_event = "RESET" + self.lnk_event = "NONE" # State machine. if self.lnk_state == 'WAIT FOR FALLING EDGE': # The start of a cycle is a falling edge. @@ -108,6 +102,9 @@ class Decoder(srd.Decoder): self.lnk_fall = self.samplenum # Go to waiting for sample time self.lnk_state = 'WAIT FOR DATA SAMPLE' + self.put(self.lnk_fall, self.samplenum, self.out_ann, + [ANN_DEC, ['LNK: NEGEDGE: ']]) + print ("DEBUG: NEGEDGE t0=%d t+=%d" % (self.lnk_fall, self.samplenum)) elif self.lnk_state == 'WAIT FOR DATA SAMPLE': # Data should be sample one 'time unit' after a falling edge if (self.samplenum - self.lnk_fall == 1*self.time_base): @@ -115,23 +112,39 @@ class Decoder(srd.Decoder): self.lnk_event = "DATA BIT" if (self.lnk_bit) : self.lnk_state = 'WAIT FOR FALLING EDGE' else : self.lnk_state = 'WAIT FOR RISING EDGE' + self.put(self.lnk_fall, self.samplenum, self.out_ann, + [ANN_DEC, ['LNK: BIT: ' + str(self.lnk_bit)]]) + print ("DEBUG: BIT=%d t0=%d t+=%d" % (self.lnk_bit, self.lnk_fall, self.samplenum)) elif self.lnk_state == 'WAIT FOR RISING EDGE': # The end of a cycle is a rising edge. if (owr == 1): - # A reset cycle is longer than 8T + # A reset cycle is longer than 8T. if (self.samplenum - self.lnk_fall > 8*self.time_base): # Save the sample number for the falling edge. self.lnk_rise = self.samplenum - # Send a reset event to the next protocol layer + # Send a reset event to the next protocol layer. self.lnk_event = "RESET" self.lnk_state = "WAIT FOR PRESENCE DETECT" + self.put(self.lnk_fall, self.samplenum, self.out_proto, + ['RESET']) + self.put(self.lnk_fall, self.samplenum, self.out_ann, + [ANN_DEC, ['LNK: RESET: ']]) + print ("DEBUG: RESET t0=%d t+=%d" % (self.lnk_fall, self.samplenum)) + # Reset the timer. + self.lnk_fall = self.samplenum + # Otherwise this is assumed to be a data bit. + else : + self.lnk_state = "WAIT FOR FALLING EDGE" elif self.lnk_state == 'WAIT FOR PRESENCE DETECT': # Data should be sample one 'time unit' after a falling edge if (self.samplenum - self.lnk_rise == 2.5*self.time_base): - self.lnk_bit = owr & 0x1 - self.lnk_event = "PRESENCE DETECT" + self.lnk_present = owr & 0x1 + #self.lnk_event = "PRESENCE DETECT" if (self.lnk_bit) : self.lnk_state = 'WAIT FOR FALLING EDGE' else : self.lnk_state = 'WAIT FOR RISING EDGE' + self.put(self.lnk_fall, self.samplenum, self.out_ann, + [ANN_DEC, ['LNK: PRESENCE: ' + str(self.lnk_present)]]) + print ("DEBUG: PRESENCE=%d t0=%d t+=%d" % (self.lnk_present, self.lnk_fall, self.samplenum)) else: raise Exception('Invalid lnk_state: %d' % self.lnk_state) @@ -148,9 +161,11 @@ class Decoder(srd.Decoder): if (self.net_state == "WAIT FOR COMMAND"): self.net_cnt = self.net_cnt + 1 self.net_cmd = (self.net_cmd << 1) & self.lnk_bit - if (self.lnk_cnt == 8): - self.put(self.startsample, self.samplenum, self.out_proto, ['LNK: BYTE', self.lnk_byte]) - self.put(self.startsample, self.samplenum, self.out_ann , ['LNK: BYTE', self.lnk_byte]) + if (self.net_cnt == 8): + self.put(self.lnk_fall, self.samplenum, + self.out_proto, ['LNK: COMMAND', self.net_cmd]) + self.put(self.lnk_fall, self.samplenum, self.out_ann, + [ANN_DEC, ['LNK: COMMAND: ' + self.net_cmd]]) if (self.net_cmd == 0x33): # READ ROM break @@ -172,16 +187,15 @@ class Decoder(srd.Decoder): elif (self.net_cmd == 0x69): # OVERDRIVE MATCH ROM break - self.lnk_cnt = 0 - if (self.net_state == "WAIT FOR ROM"): + self.net_cnt = 0 + elif (self.net_state == "WAIT FOR ROM"): # break else: raise Exception('Invalid net_state: %d' % self.net_state) elif not (self.lnk_event == "NONE"): - raise Exception('Invalid net_event: %d' % self.net_event) - + raise Exception('Invalid lnk_event: %s' % self.lnk_event) # if (self.samplenum == self.lnk_start + 8*self.time_base): -# self.put(self.startsample, self.samplenum - 1, self.out_proto, ['RESET']) +# self.put(self.lnk_fall, self.samplenum - 1, self.out_proto, ['RESET']) |