S32KのトピックRe: set flexcan to Listen-Only mode, RX interrupt abnormal

set flexcan to Listen-Only mode, RX interrupt abnormal

liuning_neu — Fri, 15 May 2020 07:41:40 GMT

hi nxp S32K expert :

I use S32K148, for flexcan module,I want to Switch off transmit path, because i can not find the right way to do it, so i choose set flexcan to Listen-Only mode. after i set flexcan to Listen-Only mode, when flexcan receive a can message, it enter FLEXCAN_Error_IRQHandler, not enter FLEXCAN_IRQHandler. my destination is set flexcan to Listen-Only mode, when flexcan receive a can message, it enter FLEXCAN_IRQHandler. in my opinion ,the result identify RX interrupt are functional in LOM mode abnormally.

my question:

1: I want to konw the result is right or wrong? if it is wrong , what is the right way to realize it?

2: Is there other way to realize Switch off transmit path of flexcan

my codes as following:

/* enter freeze mode */

FLEXCAN_EnterFreezeMode(base);
/* Select mode */
FLEXCAN_SetOperationMode(base, FLEXCAN_LISTEN_ONLY_MODE);

/* exit freeze mode*/
FLEXCAN_ExitFreezeMode(base);

Re: set flexcan to Listen-Only mode, RX interrupt abnormal

PetrS — Fri, 15 May 2020 10:41:45 GMT

Hi,

it could be expected behavior, if a message is not acknowledged by other node

BR, Petr

Re: set flexcan to Listen-Only mode, RX interrupt abnormal

liuning_neu — Mon, 18 May 2020 00:48:35 GMT

hi Petr Stancik:

how to realize a message is acknowledged by other node? could you tell me the specific operation or where i can get it ?

Re: set flexcan to Listen-Only mode, RX interrupt abnormal

PetrS — Mon, 18 May 2020 18:24:55 GMT

Hi,

you should have another active CAN node on the bus, which acknowledges the message. Every active node, that is able to transmit/receive, acknowledge a message on the bus, this is autonomous behavior as per CAN standard.

BR, Petr

Re: set flexcan to Listen-Only mode, RX interrupt abnormal

liuning_neu — Tue, 19 May 2020 01:05:10 GMT

thank you very muchPetr Stancik