Difference between revisions of "Transclusion: Debian: iMX7: CAN Bus"

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imported>Uri.mashiach
 
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* Software to install {{filename|can-utils}}
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===== Software installation =====
 +
* Use the following command to install {{filename|can-utils}}:
 
<pre>
 
<pre>
 
root@cl-rootfs:~# apt-get install --no-install-recommends can-utils
 
root@cl-rootfs:~# apt-get install --no-install-recommends can-utils

Latest revision as of 15:17, 10 December 2018

Software installation
  • Use the following command to install can-utils:
root@cl-rootfs:~# apt-get install --no-install-recommends can-utils
Loading CAN modules

If the FLEXCAN driver and/or Raw CAN protocol compiled as module(s), they must be loaded prior to enabling CAN interface.

  • The FLEXCAN driver gets loaded automatically. Make sure it is loaded:
root@cl-rootfs:~# lsmod | grep can
flexcan                102  0
The FLEXCAN driver can be loaded manually:
root@cl-rootfs:~# modprobe flexcan
30a00000.can supply xceiver not found, using dummy regulator
flexcan 30a00000.can: device registered (reg_base=f5a00000, irq=277)
30a10000.can supply xceiver not found, using dummy regulator
flexcan 30a10000.can: device registered (reg_base=f5a10000, irq=278)
  • Load Raw CAN protocol module:
root@cl-rootfs:~# modprobe can-raw
can: raw protocol (rev 20120528)
CAN interface configuration

It is recommended configure the CAN interface, with the iproute2 utilities.

  • To make sure the right ip utility is used, run:
root@cl-rootfs:~# ip -V
ip utility, iproute2-ss151103
  • Configure the CAN interface bit-rate to 125 Kbits/sec (values of up to 1Mbit/sec are supported):
root@cl-rootfs:~# ip link set can0 type can bitrate 125000
  • Enable the CAN interface:
root@cl-rootfs:~# ip link set can0 up
flexcan 30a00000.can can0: writing ctrl=0x0b312005
Send/Receive packets

Use cansend and candump utilities to send and receive packets via CAN interface.

  • Send standard CAN frame (on the first device):
root@cl-rootfs:~# cansend can0 111#1122334455667788
  • Send extended CAN frame (on the first device):
root@cl-rootfs:~# cansend can0 11111111#1122334455667788
  • Dump all received data frames as well as error frames (on the second device):
root@cl-rootfs:~# candump any,0:0,#FFFFFFFF
  can0  111  [8] 11 22 33 44 55 66 77 88
  can0  11111111  [8] 11 22 33 44 55 66 77 88