StarSBC-6ULL CAN bus example - Revision history

Piotrzbysinski: /* Loop test */

2022-12-13T08:58:23Z

Loop test

← Older revision		Revision as of 08:58, 13 December 2022
Line 5:		Line 5:
	=== Loop test ===		=== Loop test ===

	The extension board has two CAN buses available so they may be connected to perform the test in a loop. All signals are available on the J101 connector. They should be connected according to the following table:		The SLH2-comm extension board has two CAN buses available so they may be connected to perform the test in a loop. All signals are available on the J101 connector. They should be connected according to the following table:

	{\| class="wikitable"		{\| class="wikitable"
Line 61:		Line 61:
	can0 5E1 [8] 76 16 70 79 13 57 CB 02		can0 5E1 [8] 76 16 70 79 13 57 CB 02
	</pre>		</pre>


	=== CAN/USB converter test ===		=== CAN/USB converter test ===

Piotrzbysinski at 08:57, 13 December 2022

2022-12-13T08:57:02Z

← Older revision		Revision as of 08:57, 13 December 2022
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	{{PageHeader\|StarSBC-6ULL CAN bus example}} __toc__		{{PageHeader\|StarSBC-6ULL CAN bus example}} __toc__

	This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The default Yocto image contains all required software tools.		This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board SLH2-comm. The default Yocto image contains all required software tools.

	=== Loop test ===		=== Loop test ===

KrzysztofChojnowski at 15:23, 25 May 2022

2022-05-25T15:23:12Z

← Older revision		Revision as of 15:23, 25 May 2022
Line 1:		Line 1:
	{{PageHeader\|StarSBC-6ULL CAN bus example}} __toc__		{{PageHeader\|StarSBC-6ULL CAN bus example}} __toc__

	This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The default Yocto image ~~build according the tutorial [[VisionSOM_imx-meta-somlabs-hardknott]]~~ contains all required software tools.		This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The default Yocto image contains all required software tools.

	=== Loop test ===		=== Loop test ===

KrzysztofChojnowski at 14:45, 25 May 2022

2022-05-25T14:45:13Z

← Older revision		Revision as of 14:45, 25 May 2022
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	\| CAN2 H (pin 9)		\| CAN2 H (pin 9)
	\|}		\|}

			[[File:StarSBC-6ULL-SLH2-can-loop.jpg\|center\|500px]]

	Both CAN buses are already defined in the default module device-tree and are recognized as can0 and can1 network interfaces:		Both CAN buses are already defined in the default module device-tree and are recognized as can0 and can1 network interfaces:

KrzysztofChojnowski: Created page with "{{PageHeader|StarSBC-6ULL CAN bus example}} toc This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The def..."

2022-02-03T14:58:31Z

Created page with "{{PageHeader|StarSBC-6ULL CAN bus example}} __toc__ This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The def..."

New page

{{PageHeader|StarSBC-6ULL CAN bus example}} __toc__

This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The default Yocto image build according the tutorial [[VisionSOM_imx-meta-somlabs-hardknott]] contains all required software tools.

=== Loop test ===

The extension board has two CAN buses available so they may be connected to perform the test in a loop. All signals are available on the J101 connector. They should be connected according to the following table:

{| class="wikitable"
|-
! CAN1 signal
! CAN2 signal
|-
| CAN1 L (pin 8)
| CAN2 L (pin 10)
|-
| CAN1 H (pin 7)
| CAN2 H (pin 9)
|}

Both CAN buses are already defined in the default module device-tree and are recognized as can0 and can1 network interfaces:

<pre>
root@starsbc-6ull:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
3: can1: <NOARP,ECHO> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
4: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
link/ether 5a:2d:ed:e9:cb:e4 brd ff:ff:ff:ff:ff:ff
5: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
6: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether 74:7a:90:ca:e4:5d brd ff:ff:ff:ff:ff:ff
</pre>

The interfaces need to be configured by setting the bitrate and enabled:

<pre>
ip link set can0 type can bitrate 125000
ip link set can0 up

ip link set can1 type can bitrate 125000
ip link set can1 up
</pre>

The data may be generated and sent using can-utils tools: cansend, cangen, candump. The following example generates random data and sends it from can1 to can0:

<pre>
root@starsbc-6ull:~# candump can0 &
root@starsbc-6ull:~# cangen can1
can0 384 [8] A5 45 1E 74 C6 35 1A 27
can0 5E1 [8] 76 16 70 79 13 57 CB 02
</pre>

=== CAN/USB converter test ===

This example requires the [https://kamami.pl/konwertery-can/580286-uccb-konwerter-usb-can.html UCCB CAN/USB converter] connected to the StarSBC-6ULL board and PC with Linux host. The Linux host needs also the installed can-utils package, for Ubuntu Linux:

<pre>
sudo apt-get install can-utils
</pre>

After connecting the CAN1 H and CAN1 L signals to the converter, a new CAN interface need to be configured on the host side. In this example the converter is recognized in host system as /dev/ttyACM1:

<pre>
dev@somlabs:~$ dmesg | tail
[22206.563301] usb 1-4.1: new full-speed USB device number 58 using xhci_hcd
[22206.665197] usb 1-4.1: New USB device found, idVendor=0483, idProduct=5740, bcdDevice= 2.00
[22206.665200] usb 1-4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[22206.665202] usb 1-4.1: Product: CAN_USB_ConverterBasic
[22206.665203] usb 1-4.1: Manufacturer: CANDevices
[22206.665205] usb 1-4.1: SerialNumber: 00000000001A
[22206.674036] cdc_acm 1-4.1:1.0: ttyACM1: USB ACM device
</pre>

The following command registers a new CAN bus interface that is attached to the /dev/ttyACM1 device:

<pre>
sudo slcand -o -s4 -S 115200 /dev/ttyACM1
</pre>

it sets the bitrate to 125kb and the serial baud rate to 115200.

A new interface should be visible in the system:

<pre>
dev@somlabs:~$ ip a
8: slcan0: <NOARP> mtu 16 qdisc noop state DOWN group default qlen 10
link/can
</pre>

It should be set up and then may be used to transmit or receive data using can-utils tools.

On StarSBC-6ULL target:
<pre>
ip link set can0 type can bitrate 125000
ip link set can0 up
cangen can0
</pre>

On host:
<pre>
dev@somlabs:~$ sudo ip link set slcan0 up
dev@somlabs:~$ candump slcan0
slcan0 553 [1] 6B
slcan0 40E [2] DF D3
slcan0 2D2 [8] 39 21 3A 18 B5 26 E3 2F

</pre>

StarSBC-6ULL CAN bus example - Revision history

Piotrzbysinski: /* Loop test */

Piotrzbysinski at 08:57, 13 December 2022

KrzysztofChojnowski at 15:23, 25 May 2022

KrzysztofChojnowski at 14:45, 25 May 2022

KrzysztofChojnowski: Created page with "{{PageHeader|StarSBC-6ULL CAN bus example}} __toc__ This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The def..."

KrzysztofChojnowski: Created page with "{{PageHeader|StarSBC-6ULL CAN bus example}} toc This tutorial shows how to send and receive data using CAN bus on StarSBC-6ULL with communication extension board. The def..."