topic Re: flexcan automatic retransmission config in S32K

flexcan automatic retransmission config

78621251 — Tue, 12 Apr 2022 09:31:45 GMT

s32k144， witch register should be configed to disable automatic retransmission when send a can message.

Re: flexcan automatic retransmission config

Senlent — Wed, 13 Apr 2022 06:12:51 GMT

I searched some registers but found nothing useful，I'm not sure if there is such a register, can you describe the requirements of your function clearly, maybe I can help you in this regard.

Re: flexcan automatic retransmission config

78621251 — Wed, 13 Apr 2022 06:44:31 GMT

such as when CANL and CANH short circuit together，start send a can message，it will send fail，but it will automatic retransmit ceaselessly，untill CANL and CANH not short circuit no longer, then the message send out successful.

Now, I want to the message be sended once whether successful or not.

Re: flexcan automatic retransmission config

Senlent — Wed, 13 Apr 2022 07:01:54 GMT

Hi@78621251

The recovery of bus-off is somewhat different from the requirement you mentioned. I don’t think it can be achieved. What you can do is to judge whether the data you send is sent ok or not.

BR!

Jim,

Re: flexcan automatic retransmission config

78621251 — Wed, 13 Apr 2022 07:10:07 GMT

because of automatic retransmission，it will enter bus-off soon.but if then message be sended once, the TEC counter will not add too much to be the condition of bus-off.

Re: flexcan automatic retransmission config

Senlent — Wed, 13 Apr 2022 08:09:21 GMT

Hi@78621251

I understand what you mean, but this is not possible to achieve, and secondly it is not standard to do so

回复： flexcan automatic retransmission config

xinliwang — Sun, 04 Sep 2022 15:13:24 GMT

Hi, @78621251

I meet the same problem and did you solve it? How to disable the can retransmission?