CAN filter - STM8AF5288

[Rx7TyreBurna]

Alright, I got my CAN stuff working in ID/mask mode, with 'all accepted' values.

I need to setup a CAN filter to only receive STD ID of 1512 (0x5e8).

I'm confused why this doesn't work.  Using SPL looking at the CAN examples.  I saw IDList, and this seemed appropriate because I only need 1 ID.  But, after setting to IDList, and entering 0x5e8, it doesn't work.

/* CAN filter init */
 CAN_FilterNumber = CAN_FilterNumber_0;
 CAN_FilterActivation = ENABLE;
 CAN_FilterMode = CAN_FilterMode_IdList;
 CAN_FilterScale = CAN_FilterScale_16Bit;
 CAN_FilterID1=0x5e8; 
 CAN_FilterID2=0;
 CAN_FilterID3=0;
 CAN_FilterID4=0;
 CAN_FilterIDMask1=0;
 CAN_FilterIDMask2=0;
 CAN_FilterIDMask3=0;
 CAN_FilterIDMask4=0; 
 CAN_FilterInit(CAN_FilterNumber, CAN_FilterActivation, CAN_FilterMode, 
 CAN_FilterScale,CAN_FilterID1, CAN_FilterID2, CAN_FilterID3,
 CAN_FilterID4,CAN_FilterIDMask1, CAN_FilterIDMask2, 
 CAN_FilterIDMask3, CAN_FilterIDMask4);

 I've seen mention of needing to include other bits, but I don't fully understand.  If it's an ID list, why would any bits other than the ID need to be included?

 

[Rx7TyreBurna]

Trying to think about it in binary....

0x5e8 - 010111101000

Appending RTR of 0, IDE of 0 to the end.

0x17a0 - 01011110100000

Now, in IdMask mode, this appears to work:

/* CAN filter init */
 CAN_FilterNumber = CAN_FilterNumber_0;
 CAN_FilterActivation = ENABLE;
 CAN_FilterMode = CAN_FilterMode_IdMask;
 CAN_FilterScale = CAN_FilterScale_16Bit;
 CAN_FilterID1=0x17a0; 
 CAN_FilterID2=0;
 CAN_FilterID3=0;
 CAN_FilterID4=0;
 CAN_FilterIDMask1=0x1FF0;
 CAN_FilterIDMask2=0;
 CAN_FilterIDMask3=0;
 CAN_FilterIDMask4=0; 
 CAN_FilterInit(CAN_FilterNumber, CAN_FilterActivation, CAN_FilterMode, 
 CAN_FilterScale,CAN_FilterID1, CAN_FilterID2, CAN_FilterID3,
 CAN_FilterID4,CAN_FilterIDMask1, CAN_FilterIDMask2, 
 CAN_FilterIDMask3, CAN_FilterIDMask4);

But, if I put it in IdList mode, with 0x17a0 as the only FilterID in the first spot, it doesn't work....

Why?  I could achieve 0x17a0 by bit shifting to the left 2 bits, right?

But, overall, why doesn't this seem to work in IdList mode? (With the 0x1FF0 mask removed)