View source for CAN bus Linux driver

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==
<pre class="host">
 $ make linux26-menuconfig
</pre>

<pre class="config">
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
</pre>

<pre class="host">
 $ make
</pre>
* Reflash kernel and rootfs

==Usage==
* load all the needed drivers:
<pre class="apf">
modprobe can
modprobe candev
modprobe can-raw
modprobe mcp251x
</pre>

==Quick test==
Once the driver installed, the CAN interface has to be started like a standard net interface
<pre class="apf">
 # ifconfig can0 up
</pre>
and can be stopped like that:
<pre class="apf">
 # ifconfig can0 down
</pre>
The socketCAN version can be retrieved like that:
<pre class="apf">
 # cat /proc/net/can/version
</pre>
The socketCAN statistics can be retrieved like that:
<pre class="apf">
 # cat /proc/net/can/stats
</pre>
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:
 [armadeus]$ make menuconfig
[[Image:Menuconfig_package.png]]
<br> <br>
[[Image:Menuconfig_package_net.png]]
<br> <br>
[[Image:Menuconfig_package_socketcan.png]]

==Links==
* http://developer.berlios.de/projects/socketcan/ (CAN Linux Driver)
* http://ww1.microchip.com/downloads/en/DeviceDoc/21801e.pdf (MCP2515 datasheet)
* http://www.kvaser.com/can/protocol/index.htm (CAN introduction)

[[Category:Linux drivers]]
[[Category:CAN bus]]