DESK-MX6-L/Pheripherals/CAN
< DESK-MX6-L
Revision as of 14:23, 16 July 2021 by U0009 (talk | contribs) (U0009 moved page AXEL Lite SOM/DESK-MX6-L/Pheripherals/CAN to DESK-MX6-L/Pheripherals/CAN: modifica gestione DESK come prodotto a se stante)
| HOME | SOMs | SBCs | ToloMEO Embedded Assistant |  GET A QUOTE
|
 ONLINE HELPDESK
|
| Roadmap | IoT Services | ML/AI services | Embedded Design Services |
| History | |||
|---|---|---|---|
| Version | Issue Date | Notes | |
| 1.0.0 | Oct 2020 | First DESK 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]
... ... [ 2.354147] flexcan 2090000.flexcan: 2090000.flexcan supply xceiver not found, using dummy regulator [ 2.363991] flexcan 2090000.flexcan: device registered (reg_base=c0ad0000, irq=34) ... ... [ 4.731593] can: controller area network core (rev 20170425 abi 9) [ 4.742342] can: raw protocol (rev 20170425) [ 4.746641] can: broadcast manager protocol (rev 20170425 t) [ 4.752317] can: netlink gateway (rev 20170425) 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
root@desk-mx6:~# ifconfig can0
can0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
UP RUNNING NOARP MTU:16 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:10
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:31
root@desk-mx6:~#
Usage with can-utils[edit | edit source]
root@desk-mx6:~# ip link set can0 type can bitrate 500000 triple-sampling on root@desk-mx6:~# ifconfig can0 up root@desk-mx6:~# cansend can0 01a#11223344AABBCCDD root@desk-mx6:~# candump can0
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.txt
