How to receive multiple IDs in a single buffer on flexcan

Oido — Mon, 15 Apr 2024 05:46:46 GMT

I'm using S32K144W and I can only use up to 7 buffers with CAN FD and 64byte, but I have a lot of CAN IDs to use.
Is it possible to use multiple IDs with one buffer?
For example, CAN0->RAMn [1*MSG_BUF_SIZE + 0] = 0xC4000000;
CAN0->RAMn[ 1*MSG_BUF_SIZE + 1] = 0x100<<18;
With buffer one.
And when I receive data of various different IDs using buffer 1, should I initialize the buffer every time I receive it?

It's part of the code, but as buffer 1, I use buffer 0x100, buffer 2
You can receive up to 0x200-20F.

uint32_t RxCODE;

uint32_t RxID;

uint32_t RxLENGTH;

uint32_t RxDATA[16]={0,};

uint32_t RxDATA2[16]={0,};

uint32_t RxDATA3[16]={0,};

uint32_t RxTIMESTAMP;

void CAN0_Init(void)

{

#define MSG_BUF_SIZE 18

uint32_t i=0;

uint32_t k=0;

PCC->PCCn[PCC_FlexCAN0_INDEX] |= PCC_PCCn_CGC_MASK;

CAN0->MCR |= CAN_MCR_MDIS_MASK;

CAN0->CTRL1 |= CAN_CTRL1_CLKSRC_MASK;

CAN0->MCR &= ~CAN_MCR_MDIS_MASK; //CAN

while (!((CAN0->MCR & CAN_MCR_FRZACK_MASK) >> CAN_MCR_FRZACK_SHIFT)) {}

for(i=0; i<7; i++ )

{

for(k=0;k<16;k++)

{

CAN0->RAMn[i*MSG_BUF_SIZE +2+k] = 0;

}

CAN0->RXMGMASK = 0x1FFFFFFF;

CAN0->RAMn[ 1*MSG_BUF_SIZE + 0] = 0xC4000000;

CAN0->RAMn[ 1*MSG_BUF_SIZE + 1] = 0x100<<18;

CAN0->RAMn[ 3*MSG_BUF_SIZE + 0] = 0xC4000000;

CAN0->RAMn[ 3*MSG_BUF_SIZE + 1] = 0x200<<18;

CAN0->RXIMR[3] = 0x3F0<<18;

CAN0->FDCTRL = CAN_FDCTRL_FDRATE_MASK|CAN_FDCTRL_MBDSR0(3)|CAN_FDCTRL_TDCEN_MASK|CAN_FDCTRL_TDCOFF(5);

CAN0->CTRL2 = CAN_CTRL2_ISOCANFDEN_MASK; //ISO CANFD 온

CAN0->MCR =CAN_MCR_IRMQ_MASK|CAN_MCR_MAXMB(6)|CAN_MCR_FDEN_MASK;//CAN_MCR_IRMQ_MASK|

while ((CAN0->MCR && CAN_MCR_FRZACK_MASK) >> CAN_MCR_FRZACK_SHIFT) {}

while ((CAN0->MCR && CAN_MCR_NOTRDY_MASK) >> CAN_MCR_NOTRDY_SHIFT) {}

}

void CAN0RX(void)

{

uint8_t j;

RxCODE = (CAN0->RAMn[ 3*MSG_BUF_SIZE + 0] & 0x07000000) >> 24; //CODE 7

RxID = (CAN0->RAMn[ 3*MSG_BUF_SIZE + 1] & CAN_WMBn_ID_ID_MASK) >> CAN_WMBn_ID_ID_SHIFT ;

RxLENGTH = (CAN0->RAMn[ 3*MSG_BUF_SIZE + 0] & CAN_WMBn_CS_DLC_MASK) >> CAN_WMBn_CS_DLC_SHIFT;

for(j=0; j<16; j++ )

{

RxDATA[j]=CAN0->RAMn[1*MSG_BUF_SIZE +2+j];

RxDATA3[j]=CAN0->RAMn[3*MSG_BUF_SIZE +2+j];

}

CAN0->IFLAG1 = 0x00000010;

}

topic How to receive multiple IDs in a single buffer on flexcan in S32K

How to receive multiple IDs in a single buffer on flexcan