命令行中输入candump然后回车可以打印出该工具的详细用法
candump - dump CAN bus traffic.
Usage: candump [options] <CAN interface>+
(use CTRL-C to terminate candump)
Options:
-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)
-b <can> (bridge mode - send received frames to <can>)
-B <can> (bridge mode - like '-b' with disabled loopback)
-u <usecs> (delay bridge forwarding by <usecs> microseconds)
-l (log CAN-frames into file. Sets '-s 2' by default)
-L (use log file format on stdout)
-n <count> (terminate after receiption 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]*
Filters:
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 can_id and can_mask are both 8 digits, they are assumed to be 29 bit EFF.
Without any given filter all data frames are received ('0:0' default filter).
Use interface name 'any' to receive from all CAN interfaces.
Examples:
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 vcan2,92345678: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)
常用的几种情况
- 直接使用如下指令查看对应CAN设备总线上的所有数据：
candump can1
- 查看特定ID的CAN数据
candump can1,181:7FF,281:7FF // candump <can_devices>,<can_id>:<can_mask>
这里是只监听CANID为0x181,0x281的数据。（知识点：CAN标准帧ID为11位，对应的掩码为0x7FF。CAN扩展帧ID为29位，对应的掩码为0x1FFFFFFF）