## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
##
-# 1-Wire protocol decoder
+# 1-Wire protocol decoder (network layer)
import sigrokdecode as srd
-# a dictionary of ROM commands and their names, next state
-command = {0x33: ["READ ROM" , "GET ROM" ],
- 0x0f: ["CONDITIONAL READ ROM" , "GET ROM" ],
- 0xcc: ["SKIP ROM" , "TRANSPORT" ],
- 0x55: ["MATCH ROM" , "GET ROM" ],
- 0xf0: ["SEARCH ROM" , "SEARCH ROM"],
- 0xec: ["CONDITIONAL SEARCH ROM", "SEARCH ROM"],
- 0x3c: ["OVERDRIVE SKIP ROM" , "TRANSPORT" ],
- 0x6d: ["OVERDRIVE MATCH ROM" , "GET ROM" ]}
+# Dictionary of ROM commands and their names, next state.
+command = {
+ 0x33: ['READ ROM' , 'GET ROM' ],
+ 0x0f: ['CONDITIONAL READ ROM' , 'GET ROM' ],
+ 0xcc: ['SKIP ROM' , 'TRANSPORT' ],
+ 0x55: ['MATCH ROM' , 'GET ROM' ],
+ 0xf0: ['SEARCH ROM' , 'SEARCH ROM'],
+ 0xec: ['CONDITIONAL SEARCH ROM', 'SEARCH ROM'],
+ 0x3c: ['OVERDRIVE SKIP ROM' , 'TRANSPORT' ],
+ 0x6d: ['OVERDRIVE MATCH ROM' , 'GET ROM' ],
+}
class Decoder(srd.Decoder):
api_version = 1
id = 'onewire_network'
name = '1-Wire network layer'
- longname = '1-Wire serial communication bus'
+ longname = '1-Wire serial communication bus (network layer)'
desc = 'Bidirectional, half-duplex, asynchronous serial bus.'
license = 'gplv2+'
inputs = ['onewire_link']
self.net_beg = 0
self.net_end = 0
# Network layer variables
- self.state = 'COMMAND'
+ self.state = 'COMMAND'
self.bit_cnt = 0
- self.search = "P"
- self.data_p = 0x0
- self.data_n = 0x0
- self.data = 0x0
+ self.search = 'P'
+ self.data_p = 0x0
+ self.data_n = 0x0
+ self.data = 0x0
self.net_rom = 0x0000000000000000
def start(self, metadata):
self.out_proto = self.add(srd.OUTPUT_PROTO, 'onewire_network')
- self.out_ann = self.add(srd.OUTPUT_ANN , 'onewire_network')
+ self.out_ann = self.add(srd.OUTPUT_ANN, 'onewire_network')
def report(self):
pass
+ def putx(self, data):
+ # Helper function for most annotations.
+ self.put(self.net_beg, self.net_end, self.out_ann, data)
+
+ def puty(self, data):
+ # Helper function for most protocol packets.
+ self.put(self.net_beg, self.net_end, self.out_proto, data)
+
def decode(self, ss, es, data):
- [code, val] = data
+ code, val = data
# State machine.
- if (code == "RESET/PRESENCE"):
- self.search = "P"
+ if code == 'RESET/PRESENCE':
+ self.search = 'P'
self.bit_cnt = 0
- self.put(ss, es, self.out_ann, [0, ['RESET/PRESENCE: %s' % ('True' if val else 'False')]])
+ self.put(ss, es, self.out_ann,
+ [0, ['RESET/PRESENCE: %s' % ('True' if val else 'False')]])
self.put(ss, es, self.out_proto, ['RESET/PRESENCE', val])
- self.state = "COMMAND"
- elif (code == "BIT"):
- if (self.state == "COMMAND"):
- # Receiving and decoding a ROM command
- if (self.onewire_collect(8, val, ss, es)):
- if (self.data in command):
- self.put(self.net_beg, self.net_end, self.out_ann, [0,
- ['ROM COMMAND: 0x%02x \'%s\'' % (self.data, command[self.data][0])]])
+ self.state = 'COMMAND'
+ elif code == 'BIT':
+ if self.state == 'COMMAND':
+ # Receiving and decoding a ROM command.
+ if self.onewire_collect(8, val, ss, es):
+ if self.data in command:
+ self.putx([0, ['ROM COMMAND: 0x%02x \'%s\''
+ % (self.data, command[self.data][0])]])
self.state = command[self.data][1]
else:
- self.put(self.net_beg, self.net_end, self.out_ann, [0,
- ['ROM COMMAND: 0x%02x \'%s\'' % (self.data, 'UNRECOGNIZED')]])
- self.state = "COMMAND ERROR"
- elif (self.state == "GET ROM"):
- # A 64 bit device address is selected
- # family code (1B) + serial number (6B) + CRC (1B)
- if (self.onewire_collect(64, val, ss, es)):
+ self.putx([0, ['ROM COMMAND: 0x%02x \'%s\''
+ % (self.data, 'UNRECOGNIZED')]])
+ self.state = 'COMMAND ERROR'
+ elif self.state == 'GET ROM':
+ # A 64 bit device address is selected.
+ # Family code (1B) + serial number (6B) + CRC (1B)
+ if self.onewire_collect(64, val, ss, es):
self.net_rom = self.data & 0xffffffffffffffff
- self.put(self.net_beg, self.net_end, self.out_ann, [0, ['ROM: 0x%016x' % self.net_rom]])
- self.put(self.net_beg, self.net_end, self.out_proto, ['ROM', self.net_rom])
- self.state = "TRANSPORT"
- elif (self.state == "SEARCH ROM"):
- # A 64 bit device address is searched for
- # family code (1B) + serial number (6B) + CRC (1B)
- if (self.onewire_search(64, val, ss, es)):
+ self.putx([0, ['ROM: 0x%016x' % self.net_rom]])
+ self.puty(['ROM', self.net_rom])
+ self.state = 'TRANSPORT'
+ elif self.state == 'SEARCH ROM':
+ # A 64 bit device address is searched for.
+ # Family code (1B) + serial number (6B) + CRC (1B)
+ if self.onewire_search(64, val, ss, es):
self.net_rom = self.data & 0xffffffffffffffff
- self.put(self.net_beg, self.net_end, self.out_ann, [0, ['ROM: 0x%016x' % self.net_rom]])
- self.put(self.net_beg, self.net_end, self.out_proto, ['ROM', self.net_rom])
- self.state = "TRANSPORT"
- elif (self.state == "TRANSPORT"):
- # The transport layer is handled in byte sized units
- if (self.onewire_collect(8, val, ss, es)):
- self.put(self.net_beg, self.net_end, self.out_ann, [0, ['DATA: 0x%02x' % self.data]])
- self.put(self.net_beg, self.net_end, self.out_proto, ['DATA', self.data])
- elif (self.state == "COMMAND ERROR"):
- # Since the command is not recognized, print raw data
- if (self.onewire_collect(8, val, ss, es)):
- self.put(self.net_beg, self.net_end, self.out_ann, [0, ['ROM ERROR DATA: 0x%02x' % self.data]])
+ self.putx([0, ['ROM: 0x%016x' % self.net_rom]])
+ self.puty(['ROM', self.net_rom])
+ self.state = 'TRANSPORT'
+ elif self.state == 'TRANSPORT':
+ # The transport layer is handled in byte sized units.
+ if self.onewire_collect(8, val, ss, es):
+ self.putx([0, ['DATA: 0x%02x' % self.data]])
+ self.puty(['DATA', self.data])
+ elif self.state == 'COMMAND ERROR':
+ # Since the command is not recognized, print raw data.
+ if self.onewire_collect(8, val, ss, es):
+ self.putx([0, ['ROM ERROR DATA: 0x%02x' % self.data]])
else:
raise Exception('Invalid state: %s' % self.state)
-
- # Link/Network layer data collector
- def onewire_collect (self, length, val, ss, es):
- # Storing the sampe this sequence begins with
- if (self.bit_cnt == 1):
+ # Link/Network layer data collector.
+ def onewire_collect(self, length, val, ss, es):
+ # Storing the sample this sequence begins with.
+ if self.bit_cnt == 1:
self.net_beg = ss
self.data = self.data & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
- self.bit_cnt = self.bit_cnt + 1
- # Storing the sampe this sequence ends with
- # In case the full length of the sequence is received, return 1
- if (self.bit_cnt == length):
- self.net_end = es
- self.data = self.data & ((1<<length)-1)
- self.bit_cnt = 0
- return (1)
+ self.bit_cnt += 1
+ # Storing the sample this sequence ends with.
+ # In case the full length of the sequence is received, return 1.
+ if self.bit_cnt == length:
+ self.net_end = es
+ self.data = self.data & ((1 << length) - 1)
+ self.bit_cnt = 0
+ return 1
else:
- return (0)
+ return 0
- # Link/Network layer search collector
- def onewire_search (self, length, val, ss, es):
- # Storing the sampe this sequence begins with
- if ((self.bit_cnt == 0) and (self.search == "P")):
+ # Link/Network layer search collector.
+ def onewire_search(self, length, val, ss, es):
+ # Storing the sample this sequence begins with.
+ if (self.bit_cnt == 0) and (self.search == 'P'):
self.net_beg = ss
- # Master receives an original address bit
- if (self.search == "P"):
- self.data_p = self.data_p & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
- self.search = "N"
- # Master receives a complemented address bit
- elif (self.search == "N"):
- self.data_n = self.data_n & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
- self.search = "D"
- # Master transmits an address bit
- elif (self.search == "D"):
- self.data = self.data & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
- self.search = "P"
- self.bit_cnt = self.bit_cnt + 1
- # Storing the sampe this sequence ends with
- # In case the full length of the sequence is received, return 1
- if (self.bit_cnt == length):
+
+ if self.search == 'P':
+ # Master receives an original address bit.
+ self.data_p = self.data_p & ~(1 << self.bit_cnt) | \
+ (val << self.bit_cnt)
+ self.search = 'N'
+ elif self.search == 'N':
+ # Master receives a complemented address bit.
+ self.data_n = self.data_n & ~(1 << self.bit_cnt) | \
+ (val << self.bit_cnt)
+ self.search = 'D'
+ elif self.search == 'D':
+ # Master transmits an address bit.
+ self.data = self.data & ~(1 << self.bit_cnt) | (val << self.bit_cnt)
+ self.search = 'P'
+ self.bit_cnt += 1
+
+ # Storing the sample this sequence ends with.
+ # In case the full length of the sequence is received, return 1.
+ if self.bit_cnt == length:
self.net_end = es
- self.data_p = self.data_p & ((1<<length)-1)
- self.data_n = self.data_n & ((1<<length)-1)
- self.data = self.data & ((1<<length)-1)
- self.search = "P"
- self.bit_cnt = 0
- return (1)
+ self.data_p = self.data_p & ((1 << length) - 1)
+ self.data_n = self.data_n & ((1 << length) - 1)
+ self.data = self.data & ((1 << length) - 1)
+ self.search = 'P'
+ self.bit_cnt = 0
+ return 1
else:
- return (0)
+ return 0
projects / libsigrokdecode.git / blobdiff