candump - manual page for candump 2020.11.0-1
candump [options] <CAN interface>+
candump - dump CAN bus traffic.
- (use CTRL-C to terminate candump)
- -t <type>
- (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)
- -H
- (read hardware timestamps instead of system timestamps)
- -c
- (increment color mode level)
- -i
- (binary output - may exceed 80 chars/line)
- -a
- (enable additional ASCII output)
- -S
- (swap byte order in printed CAN data[] - marked with '`' )
- -s <level>
- (silent mode - 0: off (default) 1: animation 2: silent)
- -l
- (log CAN-frames into file. Sets '-s 2' by default)
- -L
- (use log file format on stdout)
- -n <count>
- (terminate after reception of <count> CAN frames)
- -r <size>
- (set socket receive buffer to <size>)
- -D
- (Don't exit if a "detected" can device goes down.
- -d
- (monitor dropped CAN frames)
- -e
- (dump CAN error frames in human-readable format)
- -x
- (print extra message infos, rx/tx brs esi)
- -T <msecs>
- (terminate after <msecs> without any reception)
Up to 16 CAN interfaces with optional filter sets can be specified
on the commandline in the form: <ifname>[,filter]*
- Comma separated filters can be specified for each given CAN
interface:
- <can_id>:<can_mask>
- (matches when <received_can_id> & mask == can_id &
mask)
- <can_id>~<can_mask>
- (matches when <received_can_id> & mask != can_id &
mask)
- #<error_mask>
- (set error frame filter, see include/linux/can/error.h)
- [j|J]
- (join the given CAN filters - logical AND semantic)
CAN IDs, masks and data content are given and expected in
hexadecimal values. When the can_id is 8 digits long the CAN_EFF_FLAG is set
for 29 bit EFF format. Without any given filter all data frames are received
('0:0' default filter).
Use interface name 'any' to receive from all CAN interfaces.
candump -c -c -ta can0,123:7FF,400:700,#000000FF can2,400~7F0 can3
can8
candump -l any,0~0,#FFFFFFFF
- (log only error frames but no(!) data frames)
candump -l any,0:0,#FFFFFFFF
- (log error frames and also all data frames)
candump vcan2,12345678:DFFFFFFF
- (match only for extended CAN ID 12345678)
candump vcan2,123:7FF
- (matches CAN ID 123 - including EFF and RTR frames)
candump vcan2,123:C00007FF
- (matches CAN ID 123 - only SFF and non-RTR frames)