topic Re: FlexCan: individual masking does not work in Kinetis Microcontrollers

FlexCan: individual masking does not work

kilobyte — Wed, 08 Jul 2015 07:02:05 GMT

Hi community,

I want to use individual masking functionality of FlexCAN by setup a mask to received CAN Message.

My setup is the following:

- use MB1 as receive message box

- IDAM bit = Format A

- IRMQ bit = 1 (individual masking is enabled and FIFO is not used)

- RXIMR1 = 0x00000700 (I want to receive all IDs between 0x300 and 0x3FF)

- ID = 0x300 therfore in MB[1].ID it is 0xC000000

I verified that the RXIMR1 register is written correctly in FreezeMode

I also verified that MB[1].ID is also written correctly.

Why do I get all CAN ID´s with this Setup and the defined mask (0x700) has no effect ?

Is there any additional configuration which I missed ?

Thanks for your help.

Jochen

Re: FlexCan: individual masking does not work

Hui_Ma — Thu, 09 Jul 2015 04:34:03 GMT

Hi Jochen,

Please check below message buffer structure:

The standard frame ID is from bit 28 to bit 18.

So the RXIMR1 = 0x00000700 should change to RXIMR1 = 0x1C000000

Wish it helps.

Have a great day,
Ma Hui

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Re: FlexCan: individual masking does not work

kilobyte — Thu, 09 Jul 2015 07:58:58 GMT

Hi Ma Hui,

thanks a lot for your Support!

That was exactly the solution I needed.

Now it works perfect!

Regards

Jochen