TMS320F28375D: DCAN dont drive TX pin in Normal mode

RusElProm

Prodigy 75 points

Part Number: TMS320F28375D

Hi all.

I am face to face with next problem.

I am using TMS320F28375D chip and and can_loopback_interrupts example for CAN module.

Its test Interrupts loopback and TX pin of harware.

I set up bit timings to achive 1mbs for CAN, see good CAn message in TX pin by oscilloscope.

Loopback working with out errors

But if puts controller to normal states without test bit no TX activity on pin. But interrupt driving work fine with out error.

Any idia?

over 5 years ago

0 Joseph Casuga over 5 years ago

TI__Mastermind 37760 points

Hi,

One possible cause is that CAN had many errors since probably CANRX pin is not connected to the transceiver. If error reaches a threshold, then transmission will stop. Try connecting the CAN to a transceiver, or put a jumper between CANTX and CANRX pin (but configure the mux for CANRX as well) and you should be able to scope the frames externally.

Regards,

Joseph

0 Joseph Casuga over 5 years ago in reply to Joseph Casuga

TI__Mastermind 37760 points

Hi,

Are you still not seeing bus activity on the TX pin after recommendation above?

Thanks and regards,

Joseph

0 Joseph Casuga over 5 years ago in reply to Joseph Casuga

TI__Mastermind 37760 points

Hi RusElProm,

Any feedback on this after trying the recommendation?

Regards,

Joseph

0 RusElProm over 5 years ago in reply to Joseph Casuga

Prodigy 75 points

Hi Joseph , It really work but problem was with internal wires on PCB.=) Some signal error/

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TMS320F28375D: DCAN dont drive TX pin in Normal mode