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CAN in STR910

E. U.

Hello,

I have a question around the ST CAN library. There is a function called GetFreeIF with this code:

static u32 GetFreeIF(void)
{ if ((CAN->sMsgObj[0].CRR & CAN_CRR_BUSY) == 0) return 0; else if ((CAN->sMsgObj[1].CRR & CAN_CRR_BUSY) == 0) return 1; else return 2;
}

I donÂ't understand. Why canÂ't I have, for example, 5 receive and 10 send objects? The function is reduced to exist only two send/receive objects.

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