topic S32144-CAN_SRXDIS in S32K

S32144-CAN_SRXDIS

Junkie — Fri, 21 Oct 2022 10:32:19 GMT

I try to use FlexCAN MB0 to receive CAN frames transmitted by itself-MB1, just like describled in RM "when MCR[SRXDIS] is deasserted, FlexCAN can receive frames transmitted by itself if a matching Rx mailbox exists. "

i initlization CAN0 normally and corrsponding pin, and clear MCR_SRXDIS, configure MB0 with ID 0x3AA, MB_CS_CODE = EMPTY, and then configure MB1 with ID 0x3AA, data0~8 bytes, MB_CS_CODE = DATA.But it does not work, PTB1 does not stop transmit frames, but FlexCAN can not received.

(CAN transceiver is connected)

Re: S32144-CAN_SRXDIS

PetrS — Fri, 21 Oct 2022 13:19:54 GMT

Hi,

be sure SRXDIS is really cleared, can be written in Freeze mode only.
Also note that only successfully transmitted message without error will be self-received. So for example if other node does not ACK a message it is repeated still and it is not received. Which is probably you have.

BR, Petr

Re: S32144-CAN_SRXDIS

Junkie — Wed, 26 Oct 2022 08:26:27 GMT

yes, your are right !
Thank you very much !