Difference between revisions of "DESK-MX6UL-L/Peripherals/CAN"
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! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History | ! colspan="4" style="width:100%; text-align:left" ; border-bottom:solid 2px #ededed" |History | ||
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! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes | ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white" |Notes | ||
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| − | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" | | + | | style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000" |First DESK-MX6UL-L release |
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| + | ! style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#ededed; padding:5px; color:#000000" |DESK-MX6UL-L 4.0.0 release | ||
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... | ... | ||
... | ... | ||
| − | [ 3. | + | [ 3.047454] can: controller area network core |
| − | [ 3. | + | [ 3.057221] can: raw protocol |
| − | [ 3. | + | [ 3.069417] can: broadcast manager protocol |
| − | [ 3. | + | [ 3.073846] can: netlink gateway - max_hops=1 |
... | ... | ||
... | ... | ||
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<pre class="workstation-terminal"> | <pre class="workstation-terminal"> | ||
| − | root@desk-mx6ul-lynx:~# ip link set can0 type can bitrate 500000 triple-sampling on loopback on | + | root@desk-mx6ul-lynx:~# ip link set can0 type can bitrate 500000 triple-sampling on loopback on |
root@desk-mx6ul-lynx:~# ifconfig can0 up | root@desk-mx6ul-lynx:~# ifconfig can0 up | ||
root@desk-mx6ul-lynx:~# candump can0 & | root@desk-mx6ul-lynx:~# candump can0 & | ||
| − | [1] | + | [1] 291 |
interface = can0, family = 29, type = 3, proto = 1 | interface = can0, family = 29, type = 3, proto = 1 | ||
| − | root@desk-mx6ul-lynx:~# cansend can0 -i 0x7ff 00 01 02 03 04 05 06 07 | + | root@desk-mx6ul-lynx:~# cansend can0 -i 0x7ff 00 01 02 03 04 05 06 07 |
interface = can0, family = 29, type = 3, proto = 1 | interface = can0, family = 29, type = 3, proto = 1 | ||
<0x7ff> [8] 00 01 02 03 04 05 06 07 | <0x7ff> [8] 00 01 02 03 04 05 06 07 | ||
Latest revision as of 17:58, 11 January 2024
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| History | |||
|---|---|---|---|
| Issue Date | Notes | ||
| First DESK-MX6UL-L release | |||
| DESK-MX6UL-L 3.0.0 release | |||
| 2023/05/04 | DESK-MX6UL-L 4.0.0 release | ||
Contents
Peripheral CAN[edit | edit source]
 The CAN peripheral is not available on AXEL ULite EVK. This peripheral is available on the i.MX6UL standard product SBCLynx |
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the AXEL ULite SOM:
From imx6ul-lynx-som0013-cb002f.dts:
&can1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_flexcan1>;
status = "okay";
};
From imx6ul-lynx-som0013.dtsi:
&iomuxc {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hog_gpios>;
imx6ul-lynx {
...
...
pinctrl_flexcan1: flexcan1grp{
fsl,pins = <
MX6UL_PAD_LCD_DATA09__FLEXCAN1_RX 0x1b020
MX6UL_PAD_LCD_DATA08__FLEXCAN1_TX 0x1b020
>;
};
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 3.047454] can: controller area network core [ 3.057221] can: raw protocol [ 3.069417] can: broadcast manager protocol [ 3.073846] can: netlink gateway - max_hops=1 ... ...
Enable the interface and check status[edit | edit source]
root@desk-mx6ul-lynx:~# ip link set can0 type can bitrate 500000
root@desk-mx6ul-lynx:~# ifconfig can0 up
root@desk-mx6ul-lynx:~# 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 33
Usage with can-utils[edit | edit source]
root@desk-mx6ul-lynx:~# ip link set can0 type can bitrate 500000 triple-sampling on loopback on root@desk-mx6ul-lynx:~# ifconfig can0 up root@desk-mx6ul-lynx:~# candump can0 & [1] 291 interface = can0, family = 29, type = 3, proto = 1 root@desk-mx6ul-lynx:~# cansend can0 -i 0x7ff 00 01 02 03 04 05 06 07 interface = can0, family = 29, type = 3, proto = 1 <0x7ff> [8] 00 01 02 03 04 05 06 07 <0x7ff> [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
