'overdrive' : ['Overdrive', 1],
'cnt_normal_bit' : ['Time (in samplerate periods) for normal mode sample bit' , 0],
'cnt_normal_presence' : ['Time (in samplerate periods) for normal mode sample presence', 0],
+ 'cnt_normal_reset' : ['Time (in samplerate periods) for normal mode reset' , 0],
'cnt_overdrive_bit' : ['Time (in samplerate periods) for overdrive mode sample bit' , 0],
'cnt_overdrive_presence': ['Time (in samplerate periods) for overdrive mode sample presence', 0],
+ 'cnt_overdrive_reset' : ['Time (in samplerate periods) for overdrive mode reset' , 0],
}
annotations = [
['Link', 'Link layer events (reset, presence, bit slots)'],
# Link layer variables
self.lnk_state = 'WAIT FOR FALLING EDGE'
self.lnk_event = 'NONE'
- self.lnk_fall = 0
self.lnk_present = 0
self.lnk_bit = 0
+ self.lnk_overdrive = 0
+ # Event timing variables
+ self.lnk_fall = 0
+ self.lnk_rise = 0
+ self.net_beg = 0
+ self.net_end = 0
# Network layer variables
self.net_state = 'IDLE'
self.net_cnt = 0
# check if samplerate is appropriate
self.samplerate = metadata['samplerate']
if (self.options['overdrive']):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['NOTE: Sample rate checks assume overdrive mode.']])
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['NOTE: Sample rate checks assume overdrive mode.']])
if (self.samplerate < 2000000):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['ERROR: Sampling rate is too low must be above 2MHz for proper overdrive mode decoding.']])
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['ERROR: Sampling rate is too low must be above 2MHz for proper overdrive mode decoding.']])
elif (self.samplerate < 5000000):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['WARNING: Sampling rate is suggested to be above 5MHz for proper overdrive mode decoding.']])
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['WARNING: Sampling rate is suggested to be above 5MHz for proper overdrive mode decoding.']])
else:
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['NOTE: Sample rate checks assume normal mode only.']])
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['NOTE: Sample rate checks assume normal mode only.']])
if (self.samplerate < 400000):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['ERROR: Sampling rate is too low must be above 400kHz for proper normal mode decoding.']])
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['ERROR: Sampling rate is too low must be above 400kHz for proper normal mode decoding.']])
elif (self.samplerate < 1000000):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['WARNING: Sampling rate is suggested to be above 1MHz for proper normal mode decoding.']])
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['WARNING: Sampling rate is suggested to be above 1MHz for proper normal mode decoding.']])
# The default 1-Wire time base is 30us, this is used to calculate sampling times.
if (self.options['cnt_normal_bit']): self.cnt_normal_bit = self.options['cnt_normal_bit']
- else: self.cnt_normal_bit = float(self.samplerate) * 0.000015 # 15ns
+ else: self.cnt_normal_bit = int(float(self.samplerate) * 0.000015) - 1 # 15ns
if (self.options['cnt_normal_presence']): self.cnt_normal_presence = self.options['cnt_normal_presence']
- else: self.cnt_normal_presence = float(self.samplerate) * 0.000075 # 15ns
+ else: self.cnt_normal_presence = int(float(self.samplerate) * 0.000075) - 1 # 75ns
+ if (self.options['cnt_normal_reset']): self.cnt_normal_reset = self.options['cnt_normal_reset']
+ else: self.cnt_normal_reset = int(float(self.samplerate) * 0.000480) - 1 # 480ns
if (self.options['cnt_overdrive_bit']): self.cnt_overdrive_bit = self.options['cnt_overdrive_bit']
- else: self.cnt_overdrive_bit = float(self.samplerate) * 0.000002 # 2ns
+ else: self.cnt_overdrive_bit = int(float(self.samplerate) * 0.000002) - 1 # 2ns
if (self.options['cnt_overdrive_presence']): self.cnt_overdrive_presence = self.options['cnt_overdrive_presence']
- else: self.cnt_overdrive_presence = float(self.samplerate) * 0.000010 # 10ns
+ else: self.cnt_overdrive_presence = int(float(self.samplerate) * 0.000010) - 1 # 10ns
+ if (self.options['cnt_overdrive_reset']): self.cnt_overdrive_reset = self.options['cnt_overdrive_reset']
+ else: self.cnt_overdrive_reset = int(float(self.samplerate) * 0.000048) - 1 # 48ns
+
# Check if sample times are in the allowed range
- # TODO
- self.time_base = float(self.samplerate) * float(0.000030)
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK, ['time_base = %d' % self.time_base]])
+ time_min = float(self.cnt_normal_bit ) / self.samplerate
+ time_max = float(self.cnt_normal_bit+1) / self.samplerate
+ if ( (time_min < 0.000005) or (time_max > 0.000015) ) :
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['WARNING: The normal mode data sample time interval (%2.1fus-%2.1fus) should be inside (5.0us, 15.0us).' % (time_min*1000000, time_max*1000000)]])
+ time_min = float(self.cnt_normal_presence ) / self.samplerate
+ time_max = float(self.cnt_normal_presence+1) / self.samplerate
+ if ( (time_min < 0.0000681) or (time_max > 0.000075) ) :
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['WARNING: The normal mode presence sample time interval (%2.1fus-%2.1fus) should be inside (68.1us, 75.0us).' % (time_min*1000000, time_max*1000000)]])
+ time_min = float(self.cnt_overdrive_bit ) / self.samplerate
+ time_max = float(self.cnt_overdrive_bit+1) / self.samplerate
+ if ( (time_min < 0.000001) or (time_max > 0.000002) ) :
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['WARNING: The overdrive mode data sample time interval (%2.1fus-%2.1fus) should be inside (1.0us, 2.0us).' % (time_min*1000000, time_max*1000000)]])
+ time_min = float(self.cnt_overdrive_presence ) / self.samplerate
+ time_max = float(self.cnt_overdrive_presence+1) / self.samplerate
+ if ( (time_min < 0.0000073) or (time_max > 0.000010) ) :
+ self.put(0, 0, self.out_ann, [ANN_LINK, ['WARNING: The overdrive mode presence sample time interval (%2.1fus-%2.1fus) should be inside (7.3us, 10.0us).' % (time_min*1000000, time_max*1000000)]])
def report(self):
pass
# Go to waiting for sample time
self.lnk_state = 'WAIT FOR DATA SAMPLE'
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 == 0.5*self.time_base):
+ # Sample data bit
+ if (self.lnk_overdrive): cnt = self.cnt_overdrive_bit
+ else : cnt = self.cnt_normal_bit
+ if (self.samplenum - self.lnk_fall == cnt):
self.lnk_bit = owr & 0x1
self.lnk_event = "DATA BIT"
- if (self.lnk_bit) : self.lnk_state = 'WAIT FOR FALLING EDGE'
- else : self.lnk_state = 'WAIT FOR RISING EDGE'
+ 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_LINK, ['BIT: %01x' % self.lnk_bit]])
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.
- if (self.samplenum - self.lnk_fall > 8*self.time_base):
+ # Check if this was a reset cycle
+ if (self.samplenum - self.lnk_fall > self.cnt_normal_reset):
# Save the sample number for the falling edge.
self.lnk_rise = self.samplenum
# Send a reset event to the next protocol layer.
self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['RESET']])
# Reset the timer.
self.lnk_fall = self.samplenum
+ elif ((self.samplenum - self.lnk_fall > self.cnt_overdrive_reset) and (self.lnk_overdrive)):
+ # Save the sample number for the falling edge.
+ self.lnk_rise = self.samplenum
+ # 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 OVERDRIVE'])
+ self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_LINK , ['RESET OVERDRIVE']])
+ self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['RESET OVERDRIVE']])
+ # 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):
+ # Sample presence status
+ if (self.lnk_overdrive): cnt = self.cnt_overdrive_presence
+ else : cnt = self.cnt_normal_presence
+ if (self.samplenum - self.lnk_rise == cnt):
self.lnk_present = owr & 0x1
# Save the sample number for the falling edge.
if not (self.lnk_present) : self.lnk_fall = self.samplenum
self.net_cnt = 0
elif (self.net_state == "IDLE"):
pass
- elif (self.net_state == "TRANSPORT"):
- if (self.collect_data(8)):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TRANSPORT: 0x%02x' % self.net_data]])
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT: 0x%02x' % self.net_data]])
- self.put(self.lnk_fall, self.samplenum, self.out_proto, ['transfer', self.net_data])
elif (self.net_state == "COMMAND"):
- if (self.collect_data(8)):
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: 0x%02x' % self.net_data]])
+ # Receiving and decoding a ROM command
+ if (self.onewire_collect(8)):
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: 0x%02x' % self.net_data]])
if (self.net_data == 0x33):
# READ ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'READ ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'READ ROM\'']])
self.net_state = "GET ROM"
elif (self.net_data == 0x0f):
# CONDITIONAL READ ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'CONDITIONAL READ ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'CONDITIONAL READ ROM\'']])
self.net_state = "GET ROM"
elif (self.net_data == 0xcc):
# SKIP ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'SKIP ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'SKIP ROM\'']])
self.net_state = "TRANSPORT"
elif (self.net_data == 0x55):
# MATCH ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'MATCH ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'MATCH ROM\'']])
self.net_state = "GET ROM"
elif (self.net_data == 0xf0):
# SEARCH ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'SEARCH ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'SEARCH ROM\'']])
self.net_state = "SEARCH ROM"
elif (self.net_data == 0xec):
# CONDITIONAL SEARCH ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'CONDITIONAL SEARCH ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'CONDITIONAL SEARCH ROM\'']])
self.net_state = "SEARCH ROM"
elif (self.net_data == 0x3c):
# OVERDRIVE SKIP ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'OVERDRIVE SKIP ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'OVERDRIVE SKIP ROM\'']])
+ self.lnk_overdrive = 1
self.net_state = "TRANSPORT"
elif (self.net_data == 0x69):
# OVERDRIVE MATCH ROM
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'OVERDRIVE MATCH ROM\'']])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM COMMAND: \'OVERDRIVE MATCH ROM\'']])
+ self.lnk_overdrive = 1
self.net_state = "GET ROM"
elif (self.net_state == "GET ROM"):
+ # A 64 bit device address is selected
# family code (1B) + serial number (6B) + CRC (1B)
- if (self.collect_data(64)):
+ if (self.onewire_collect(64)):
self.net_rom = self.net_data & 0xffffffffffffffff
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM: 0x%016x' % self.net_rom]])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM: 0x%016x' % self.net_rom]])
self.net_state = "TRANSPORT"
elif (self.net_state == "SEARCH ROM"):
+ # A 64 bit device address is searched for
# family code (1B) + serial number (6B) + CRC (1B)
- if (self.collect_search(64)):
+ if (self.onewire_search(64)):
self.net_rom = self.net_data & 0xffffffffffffffff
- self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK, ['ROM: 0x%016x' % self.net_rom]])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK, ['ROM: 0x%016x' % self.net_rom]])
self.net_state = "TRANSPORT"
+ elif (self.net_state == "TRANSPORT"):
+ # The transport layer is handled in byte sized units
+ if (self.onewire_collect(8)):
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_NETWORK , ['TRANSPORT: 0x%02x' % self.net_data]])
+ self.put(self.net_beg, self.net_end, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT: 0x%02x' % self.net_data]])
+ self.put(self.net_beg, self.net_end, self.out_proto, ['transfer', self.net_data])
+ # TODO: Sending translort layer data to 1-Wire device models
else:
raise Exception('Invalid net_state: %s' % self.net_state)
# Link/Network layer data collector
- def collect_data (self, length):
+ def onewire_collect (self, length):
if (self.lnk_event == "DATA BIT"):
- #print ("DEBUG: BIT=%d t0=%d t+=%d" % (self.lnk_bit, self.lnk_fall, self.samplenum))
+ # Storing the sampe this sequence begins with
+ if (self.net_cnt == 1):
+ self.net_beg = self.samplenum
self.net_data = self.net_data & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt)
self.net_cnt = self.net_cnt + 1
+ # Storing the sampe this sequence ends with
+ # In case the full length of the sequence is received, return 1
if (self.net_cnt == length):
+ self.net_end = self.samplenum
self.net_data = self.net_data & ((1<<length)-1)
self.net_cnt = 0
return (1)
return (0)
# Link/Network layer search collector
- def collect_search (self, length):
+ def onewire_search (self, length):
if (self.lnk_event == "DATA BIT"):
- #print ("DEBUG: SEARCH=%s BIT=%d t0=%d t+=%d" % (self.net_search, self.lnk_bit, self.lnk_fall, self.samplenum))
+ # Storing the sampe this sequence begins with
+ if ((self.net_cnt == 0) and (self.net_search == "P")):
+ self.net_beg = self.samplenum
+ # Master receives an original address bit
if (self.net_search == "P"):
self.net_data_p = self.net_data_p & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt)
self.net_search = "N"
+ # Master receives a complemented address bit
elif (self.net_search == "N"):
self.net_data_n = self.net_data_n & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt)
self.net_search = "D"
+ # Master transmits an address bit
elif (self.net_search == "D"):
self.net_data = self.net_data & ~(1 << self.net_cnt) | (self.lnk_bit << self.net_cnt)
self.net_search = "P"
self.net_cnt = self.net_cnt + 1
+ # Storing the sampe this sequence ends with
+ # In case the full length of the sequence is received, return 1
if (self.net_cnt == length):
+ self.net_end = self.samplenum
self.net_data_p = self.net_data_p & ((1<<length)-1)
self.net_data_n = self.net_data_n & ((1<<length)-1)
self.net_data = self.net_data & ((1<<length)-1)
return (0)
else:
return (0)
-
-
-# # Transport layer
-#
-# # State machine.
-# if (self.lnk_event == "RESET"):
-# self.trn_state = "IDLE"
-# elif (self.trn_state == "IDLE"):
-# pass
-# elif (self.trn_state == "COMMAND"):
-# if (self.collect_data(8)):
-## self.put(self.lnk_fall, self.samplenum, self.out_proto, ['FUNCTION COMMAND', self.net_data])
-# self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['FUNCTION COMMAND: 0x%02x' % self.net_data]])
-# self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['FUNCTION COMMAND: 0x%02x' % self.net_data]])
-# if (self.net_data == 0x48):
-# # COPY SCRATCHPAD
-# self.trn_state = "TODO"
-# elif (self.net_data == 0x4e):
-# # WRITE SCRATCHPAD
-# self.trn_state = "TODO"
-# elif (self.net_data == 0xbe):
-# # READ SCRATCHPAD
-# self.trn_state = "TODO"
-# elif (self.net_data == 0xb8):
-# # RECALL E2
-# self.trn_state = "TODO"
-# elif (self.net_data == 0xb4):
-# # READ POWER SUPPLY
-# self.trn_state = "TODO"
-# else:
-# # unsupported commands
-# self.trn_state = "TODO"
-# elif (self.trn_state == "TODO"):
-# if (self.collect_data(8)):
-# self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TRANSPORT DATA: 0x%02x' % self.net_data]])
-# self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT DATA: 0x%02x' % self.net_data]])
-## self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TODO unsupported transport state: %s' % self.trn_state]])
-## self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TODO unsupported transport state: %s' % self.trn_state]])
-# pass
-# else:
-# raise Exception('Invalid trn_state: %s' % self.trn_state)
-
-
-#class onewire_device ():
-# def __init__ (self, scratchpad_size = 8):
-# pass
-# def reset (self):
-# pass
-# def data (self, data):
-# self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_NETWORK , ['TRANSPORT DATA: 0x%02x' % self.net_data]])
-# self.put(self.lnk_fall, self.samplenum, self.out_ann, [ANN_TRANSPORT, ['TRANSPORT DATA: 0x%02x' % self.net_data]])
projects / libsigrokdecode.git / blobdiff