SK-AM62: CAN Send-Receive Data Issue

TI-CSC

Part Number: SK-AM62

Hello E2E Experts,

Good day.

The CAN can't send and receive data:

root@am62xx-evm:~# ip link set can0 type can bitrate 1000000
root@am62xx-evm:~# ip link set can0 up
[ 79.081593] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
root@am62xx-evm:~#
can0: flags=193<UP,RUNNING,NOARP> mtu 16 metric 1
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 42

Regards,

CSC

over 3 years ago

0 Judith Mendez over 3 years ago

TI__Expert 8520 points

Hello,

1. What is the error?

2. How are you sending CAN packets?

3. How are you verifying packages are sent?

4. What is your hardware setup?

regards,

Judith

0 TI-CSC over 3 years ago in reply to Judith Mendez

TI__Genius 16070 points

Hello Judith,

Good day.

My error is m_can_platform 20701000.can can0: bus-off

root@am62xx-evm:~# cansend can0 123#DEADBEEF
[ 731.360613] can: controller area network core
[ 731.365131] NET: Registered protocol family 29
[ 731.405226] can: raw protocol
[ 731.409973] m_can_platform 20701000.can can0: bus-off

I Refer to this link https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/08_06_00_42/exports/docs/linux/How_to_Guides/Target/How_to_test_MCAN_on_AM62x.html

root@am62xx-evm:~# ip link set can0 type can bitrate 1000000
root@am62xx-evm:~# ip link set can0 up
[ 714.901900] IPv6: ADDRCONF(NETDEV_CHANGE): can0: link becomes ready
root@am62xx-evm:~# cansend can0 123#DEADBEEF
[ 731.360613] can: controller area network core
[ 731.365131] NET: Registered protocol family 29
[ 731.405226] can: raw protocol
[ 731.409973] m_can_platform 20701000.can can0: bus-off

root@am62xx-evm:~# ifconfig
can0: flags=129 mtu 16 metric 1
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 10 (UNSPEC)
RX packets 10 bytes 80 (80.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 1 overruns 0 carrier 1 collisions 0
device interrupt 43

When I input ifconfig, I can find device can0, but it can't send or receive data.

Regards,

CSC

0 Judith Mendez over 3 years ago in reply to TI-CSC

TI__Expert 8520 points

Hello,

It seems like some connections might be incorrect or there is an issue with the CAN transceiver.

1. What external CAN transceiver are you using?

2. How are you powering the external CAN transceiver?

3. How are you connecting the CAN transceiver to MCAN (MAIN domain) on AM62x?

On the User expansion (j3), pin 8 on AM62x is MCAN RX and pin 10 is MCAN TX.

~ Judith

0 TI-CSC over 3 years ago in reply to Judith Mendez

TI__Genius 16070 points

Hello Judith,

Good day.

I Reference this article:

https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/08_06_00_42/exports/docs/linux/How_to_Guides/Target/How_to_test_MCAN_on_AM62x.html#mcan-on-am62x

On the User expansion (j3), pin 8 on AM62x is MCAN RX and pin 10 is MCAN TX.

Regards,

CSC

0 Judith Mendez over 3 years ago in reply to TI-CSC

TI__Expert 8520 points

Hi,

These pins should be correct.
How are you powering the external CAN transceiver?

~ Judith

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SK-AM62: CAN Send-Receive Data Issue