DESK-MX6-L/Pheripherals/CAN
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| History | |||
|---|---|---|---|
| ID# | Issue Date | Notes | |
| 16/07/2021 | First DESK release | ||
| 03/03/2022 | DESK 3.0.0 release | ||
| 11/04/2023 | DESK 4.0.0 release | ||
Contents
Peripheral CAN[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the AXEL Lite SOM:
From imx6qdl-sbcx-revb-common.dtsi :
&can1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_flexcan1_axel>;
status = "okay";
};
From imx6qdl-axelcommon.dtsi:
can1 {
pinctrl_flexcan1_axel: flexcan1axelgrp-1 {
fsl,pins = <
MX6QDL_PAD_GPIO_7__FLEXCAN1_TX 0x80000000
MX6QDL_PAD_GPIO_8__FLEXCAN1_RX 0x80000000
>;
};
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 4.455222] can: controller area network core [ 4.464472] can: raw protocol [ 4.467614] can: broadcast manager protocol [ 4.471816] can: netlink gateway - max_hops=1 ... ...
Enable the interface and check status[edit | edit source]
root@desk-mx6:~# ip link set can0 type can bitrate 500000
root@desk-mx6:~# ifconfig can0 up
[ 839.886499] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
root@desk-mx6:~# ifconfig can0
can0: flags=193<UP,RUNNING,NOARP> mtu 16
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 10 (UNSPEC)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 39
Usage with can-utils[edit | edit source]
root@desk-mx6:~# ip link set can0 type can bitrate 500000 triple-sampling on loopback on root@desk-mx6:~# ifconfig can0 up root@desk-mx6:~# candump can0 & [1] 321 interface = can0, family = 29, type = 3, proto = 1 root@desk-mx6:~# cansend can0 7ff#0001020304050607 can0 7FF [8] 00 01 02 03 04 05 06 07 can0 7FF [8] 00 01 02 03 04 05 06 07
Additional information[edit | edit source]
Each CAN port appears like a networking interface in the form canX where X is the port number.
Information about programming the CAN socket interface is given in the kernel tree under Documentation/networking/can.rst
