CRC value in CAN Loopback testing

[khushboosharma]

Hi,

    I am testing "Can" interface using "canutils" utility. Currently i am testing a can interface with "loopback" mode.

When i am capturing packets sent through cansend utility using tcpdump i can not see CRC field filled in packets i.e. its value is 0.

Also when i check "flexcan.c" file, i cannot find any code for filling CRC value.

Can anyone please help why no CRC value is filled?

Is it because of "loopback" mode?

At which point exaclty the "crc" field on CAN frame is filled?

Thanks

Khushboo

[igorpadykov]

Hi Khushboo

for crc usage one can look at sect.26.6.9.5 Arbitration and Matching Timing

i.MX6DQ Reference Manual

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf

Linux driver for i.mx6 flexcan mailbox

Best regards

igor

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