diff options
Diffstat (limited to 'decoders')
| -rw-r--r-- | decoders/can/pd.py | 54 |
1 files changed, 23 insertions, 31 deletions
diff --git a/decoders/can/pd.py b/decoders/can/pd.py index 5d27b28..292f51b 100644 --- a/decoders/can/pd.py +++ b/decoders/can/pd.py @@ -37,8 +37,8 @@ class Decoder(srd.Decoder): {'id': 'can_rx', 'name': 'CAN RX', 'desc': 'CAN bus line'}, ) options = ( - {'id': 'nominal_bitrate', 'desc': 'Nominal Bitrate (bits/s)', 'default': 1000000}, - {'id': 'fast_bitrate', 'desc': 'Fast Bitrate (bits/s)', 'default': 2000000}, + {'id': 'nominal_bitrate', 'desc': 'Nominal bitrate (bits/s)', 'default': 1000000}, + {'id': 'fast_bitrate', 'desc': 'Fast bitrate (bits/s)', 'default': 2000000}, {'id': 'sample_point', 'desc': 'Sample point (%)', 'default': 70.0}, ) annotations = ( @@ -172,7 +172,6 @@ class Decoder(srd.Decoder): # Remember start of CRC sequence (see below). if bitnum == (self.last_databit + 1): self.ss_block = self.samplenum - if self.fd: if self.dlc2len(self.dlc) < 16: self.crc_len = 27 # 17 + SBC + stuff bits @@ -184,12 +183,12 @@ class Decoder(srd.Decoder): # CRC sequence (15 bits, 17 bits or 21 bits) elif bitnum == (self.last_databit + self.crc_len): if self.fd: - if self.dlc2len(self.dlc) < 16: - crc_type = "CRC-17" - else: - crc_type = "CRC-21" + if self.dlc2len(self.dlc) < 16: + crc_type = "CRC-17" + else: + crc_type = "CRC-21" else: - crc_type = "CRC" # TODO: CRC-15 (will break existing tests) + crc_type = "CRC" # TODO: CRC-15 (will break existing tests) x = self.last_databit + 1 crc_bits = self.bits[x:x + self.crc_len + 1] @@ -235,23 +234,21 @@ class Decoder(srd.Decoder): # Returns True if the frame ended (EOF), False otherwise. def decode_standard_frame(self, can_rx, bitnum): - # Bit 14: FDF (Flexible Data Format) - # Has to be sent dominant when FD frame, has to be sent recessive when classic CAN frame. + # Bit 14: FDF (Flexible data format) + # Has to be sent dominant when FD frame, has to be sent recessive + # when classic CAN frame. if bitnum == 14: self.fd = True if can_rx else False - if self.fd: - self.putx([7, ['Flexible Data Format: %d' % can_rx, - 'FDF: %d' % can_rx, - 'FDF']]) + self.putx([7, ['Flexible data format: %d' % can_rx, + 'FDF: %d' % can_rx, 'FDF']]) else: self.putx([7, ['Reserved bit 0: %d' % can_rx, - 'RB0: %d' % can_rx, - 'RB0']]) + 'RB0: %d' % can_rx, 'RB0']]) - # SRR Substitute Remote Request if self.fd: - self.put12([8, ['Substitute Remote Request', 'SRR']]) + # Bit 12: Substitute remote request (SRR) bit + self.put12([8, ['Substitute remote request', 'SRR']]) self.dlc_start = 18 else: # Bit 12: Remote transmission request (RTR) bit @@ -262,17 +259,14 @@ class Decoder(srd.Decoder): 'RTR: %s frame' % rtr, 'RTR']]) self.dlc_start = 15 - if bitnum == 15: - if self.fd: - self.putx([7, ['Reserved: %d' % can_rx, 'R0: %d' % can_rx, 'R0']]) + if bitnum == 15 and self.fd: + self.putx([7, ['Reserved: %d' % can_rx, 'R0: %d' % can_rx, 'R0']]) - if bitnum == 16: - if self.fd: - self.putx([7, ['Bit rate switch: %d' % can_rx, 'BRS: %d' % can_rx, 'BRS']]) + if bitnum == 16 and self.fd: + self.putx([7, ['Bit rate switch: %d' % can_rx, 'BRS: %d' % can_rx, 'BRS']]) - if bitnum == 17: - if self.fd: - self.putx([7, ['Error state indicator: %d' % can_rx, 'ESI: %d' % can_rx, 'ESI']]) + if bitnum == 17 and self.fd: + self.putx([7, ['Error state indicator: %d' % can_rx, 'ESI: %d' % can_rx, 'ESI']]) # Remember start of DLC (see below). elif bitnum == self.dlc_start: @@ -282,7 +276,7 @@ class Decoder(srd.Decoder): elif bitnum == self.dlc_start + 3: self.dlc = int(''.join(str(d) for d in self.bits[self.dlc_start:self.dlc_start + 4]), 2) self.putb([10, ['Data length code: %d' % self.dlc, - 'DLC: %d' % self.dlc, 'DLC']]) + 'DLC: %d' % self.dlc, 'DLC']]) self.last_databit = self.dlc_start + 3 + (self.dlc2len(self.dlc) * 8) if self.dlc > 8 and not self.fd: self.putb([16, ['Data length code (DLC) > 8 is not allowed']]) @@ -351,12 +345,10 @@ class Decoder(srd.Decoder): # Bit 33: RB1 (reserved bit) elif bitnum == 33: self.fd = True if can_rx else False - if self.fd: self.dlc_start = 37 - self.putx([7, ['Flexible Data Format: %d' % can_rx, + self.putx([7, ['Flexible data format: %d' % can_rx, 'FDF: %d' % can_rx, 'FDF']]) - self.put32([7, ['Reserved bit 1: %d' % self.rtr, 'RB1: %d' % self.rtr, 'RB1']]) else: |