ip: either "dev" is duplicate, or "type" is garbage
Driver installation
- Nothing has to be done for the APF51Dev, the APF28Dev and the APF6Dev.
- For the APF27DevFull:
$ make linux-menuconfig
Networking support ---> <M> CAN bus subsystem support ---> --- CAN bus subsystem support <M> Raw CAN Protocol (raw access with CAN-ID filtering) <M> Broadcast Manager CAN Protocol (with content filtering) CAN Device Drivers ---> <M> Virtual Local CAN Interface (vcan) <M> Platform CAN drivers with Netlink support [*] CAN bit-timing calculation <M> Microchip 251x series SPI CAN Controller
$ make linux $ make
- Reflash kernel and rootfs
Usage
- Load all the needed drivers:
# modprobe can # modprobe can-dev # modprobe can-raw
APF27 & APF51 | APF6 |
---|---|
# modprobe mcp251x |
# modprobe flexcan |
- Set the bitrate before all operations
Example: Set the bitrate of the can0 interface to 125kbps:
# ip link set can0 up type can bitrate 125000
- If the following error occurs when you do the last instruction :
ip: either "dev" is duplicate, or "type" is garbage
check that this command:
# which ip
return this message:
/sbin/ip
and not this one :
/bin/ip
If the binary is installed in /bin instead of /sbin, the executable file is a link to busybox and the command to set the bitrate doesn't work on busybox, so try the following instructions:
$ make busybox-clean $ make busybox-dirclean $ make menuconfig
Package Selection for the target ---> Networking applications ---> [*] iproute2
$ make
Then, reflash your rootfs.
Quick test
- Once the driver is installed and the bitrate is set, the CAN interface has to be started like a standard net interface:
# ifconfig can0 up
- and can be stopped like that:
# ifconfig can0 down
- The socketCAN version can be retrieved this way:
# cat /proc/net/can/version
- The socketCAN statistics can be retrieved this way:
# cat /proc/net/can/stats
Userspace tools
Several tools are provided by socketCAN:
- candump: dump traffic on a CAN network
The following command shows the received message from the CAN bus
candump can0
- cansend: simple command line tool to send CAN-frames via CAN_RAW sockets
exemple : The following command sends 3 bytes on the bus (0x1E, 0x10, 0x10) with the identifier 500.
cansend can0 500#1E.10.10
You can send a remote request message
cansend can0 500#R
The information with the identifier 500 will be available on the bus when the device receive the remote request message
- cangen: CAN frames generator for testing purpose
- canplayer: send CAN frames from a file to a CAN interface
These tools can be compiled and installed on the target by means of the Buildroot menuconfig:
$ make menuconfig
Package Selection for the target ---> Networking ---> [*] Socket CAN
$ make
then, reflash your rootfs.
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