topic Re: Using FlexCAN with software ID filter in Kinetis Microcontrollers

Using FlexCAN with software ID filter

wolframwagner — Thu, 03 May 2018 12:10:58 GMT

I need some help for my actual project with the

-TWR-KE18F Board

I want to initialize the FlexCAN. My aim is to monitor the whole bitstream with the CAN0.

With every CAN-telegram an interrupt shall be triggered.

Then the ID`s and payload shall be analyzed by the ISR.

The examples from SDK 2.3 only show the filtering of the ID`s via the hardware. But I want to filter the ID`s via the software.

Do you have any tips or solutions for me?

Thank you very much.

Re: Using FlexCAN with software ID filter

Hui_Ma — Fri, 04 May 2018 03:21:47 GMT

Hi,

Customer need to set Rx Mailboxes Global Mask Registers value to 0x0.
Then the CAN master without ID filter and can receive all CAN data from slave.

Please keep Module Configuration Register (CANx_MCR) [IRMQ] bit with reset value (0b0).

Then, the hardware ID filter was ignored.

After CAN frame received, customer can use software to do further data processing.

Wish it helps.

Have a great day,
Mike

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Re: Using FlexCAN with software ID filter

wolframwagner — Mon, 07 May 2018 06:00:02 GMT

Hi Mike,

Thanks for the quick reply. My can now works as wanted

Have a gread day

Wolfram