Hi @chintan.patel2,
Below are the connection pictures used at our setup to test can loopback
I ran below commands to test can loopback
sudo -s
ip link set can1 type can bitrate 500000
ip link set up can1
ip link set can0 type can bitrate 500000
ip link set up can0
candump -x any &
root@tegra-ubuntu:/home/nvidia# cansend can1 01a#123456789ABC
root@tegra-ubuntu:/home/nvidia# can1 01A [6] 12 34 56 78 9A BC
can1 TX - - 01A [6] 12 34 56 78 9A BC
can0 RX - - 01A [6] 12 34 56 78 9A BC
root@tegra-ubuntu:/home/nvidia# cansend can0 01a#123456789ABC
root@tegra-ubuntu:/home/nvidia# can0 TX - - 01A [6] 12 34 56 78 9A BC
can1 RX - - 01A [6] 12 34 56 78 9A BC
can1 01A [6] 12 34 56 78 9A BC
From above, we can see loopback between can0 and can1 is working.
I also tested send/receive data from PCAN. For this test, the connection should be like below
I used below setting for PCAN view and tested sending CAN message
After selecting Transmit and send, I see below message on tegra terminal
root@tegra-ubuntu:/home/nvidia# can0 RX - - 123 [8] 01 02 03 04 05 06 07 08
can1 RX - - 123 [8] 01 02 03 04 05 06 07 08
can1 123 [8] 01 02 03 04 05 06 07 08
Now I tested sending data from tegra like below and CAN message is noticed on PCAN receive window.
root@tegra-ubuntu:/home/nvidia# cansend can0 234#87654321
can0 TX - - 234 [4] 87 65 43 21
can1 RX - - 234 [4] 87 65 43 21
can1 234 [4] 87 65 43 21
For P14 only one 120 resister between 1 and 8 is enough.
Please double check your connections per shared images.