Difference between revisions of "CAN bus Linux driver"

From ArmadeusWiki
Jump to: navigation, search
(Driver installation)
(Userspace tools)
Line 58: Line 58:
 
**'''canplayer''': send CAN frames from a file to a CAN interface
 
**'''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:
+
*These tools can be compiled and installed on the target by means of the Buildroot menuconfig:
[armadeus]$ make menuconfig
+
<pre class="host">
[[Image:Menuconfig_package.png]]
+
$ make menuconfig
<br> <br>
+
</pre>
[[Image:Menuconfig_package_net.png]]
+
<pre class="config">
<br> <br>
+
Package Selection for the target  --->
[[Image:Menuconfig_package_socketcan.png]]
+
    Networking  --->
 +
        [*]  Socket CAN
 +
        [*]     install test tools
 +
</pre>
 +
<pre class="host">
 +
$ make
 +
</pre>
 +
then, reflash your rootfs.
  
 
==Links==
 
==Links==

Revision as of 13:28, 25 August 2010

The current CAN bus driver uses SocketCAN API which is now the official CAN API for Linux. SocketCAN is based on the Linux socket. Further details can be found on the links at the bottom of this page.

Driver installation

 $ make linux26-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> Microchip 251x series SPI CAN Controller
 $ make
  • Reflash kernel and rootfs

Usage

  • load all the needed drivers:
modprobe can
modprobe candev
modprobe can-raw
modprobe mcp251x

Quick test

Once the driver installed, 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 like that:

 # cat /proc/net/can/version

The socketCAN statistics can be retrieved like that:

 # cat /proc/net/can/stats

The default baud rate is 250kbauds

Userspace tools

  • Several tools are provided by socketCAN:
    • candump: dump traffic on a CAN network
    • cansend: simple command line tool to send CAN-frames via CAN_RAW sockets
    • 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
        [*]     install test tools
$ make

then, reflash your rootfs.

Links