S9KEAZ64AMLK the AcceptanceMask and IDFilter do not work

[vmedvedev]

KDS 3.2.0 project built by ProcessorExpert. When initializing CANBus I install a mask and a filter:

void InitCAN()

{

     MyCANPtr = CAN1_Init(NULL);

     CAN1_Disable(MyCANPtr);

     Error = CAN1_SetAcceptanceMaskTable(MyCANPtr, 0U, 0xFFFF0000 );

     Error = CAN1_SetRxIDFilterTable(MyCANPtr, 0U, 0xFFFFF102);  // not work with ID: 0x18DAF102

     Error = CAN1_SetRxIDFilterTable(MyCANPtr, 0U, 0xFFFFE204);  // that's how it works, but why?

     CAN1_Enable(MyCANPtr);

}

Does not work. I found a solution, but it only works on the last two bytes. In the debate registers, I see the correct values I set.

This seems to be a microcontroller problem. But I haven't found any errata on this topic anywhere.
Perhaps the specialists from Freescale can clarify something?

[Alexis_A]

Hello Vladimir,

Bellow I will try to explain how the filters work.

If you check the table in the 32-77 it explains how to use the 32 bit mode filtering:

So if you want to filter 0x18DAF102 you will need to write the register IDAR with the following values:

IDAR0									IDAR1									IDAR2									IDAR3
28	27	26	25	24	23	22	21		20	19	18	SRR	IDE	17	16	15		14	13	12	11	10	9	8	7		6	5	4	3	2	1	0	RTR
1	1	0	0	0	1	1	0		1	1	0	1	1	1	0	1		1	1	1	0	0	0	1	0		0	0	0	0	0	1	0	0
C6									DD									E2									4

The IDMR register is to select which bits of the IDARx filter will be marked as "don't care". So for example if you want to allow more than 1 ID with a single filter, for example, 0x18DAF103 and 0x18DAF102, you will need to write the IDMrx registers with the following values.

IDMR0									IDMR1									IDMR2									IDMR3
28	27	26	25	24	23	22	21		20	19	18	SRR	IDE	17	16	15		14	13	12	11	10	9	8	7		6	5	4	3	2	1	0	RTR
0	0	0	0	0	0	0	0		0	0	0	0	0	0	0	0		0	0	0	0	0	0	0	0		0	0	0	0	0	0	1	0
0									0									0									2

Let me know if this helps you..

Best Regards,

Alexis Andalon

[vmedvedev]

Hello Alexis,

Thank you so much!

You helped me a lot. I get it now.

Best Regards,

Vladimir Medvedev