FlexCAN not work

lizheng887 · ‎2015-10-10

Posted on October 10, 2015 at 09:57

Hi,

I am testing SPC560P50L5 with spc5_studio, the built-in example for FlexCAN is loopback test. When I disable loopback and enable supervisor mode, there is nothing on the CAN_TXD pin. I do not know the problem, and I need your help.

Is there any good examples(FlexCAN) for me?

thanks.

Erwan YVIN · ‎2015-10-12

Posted on October 12, 2015 at 17:52

Hello Michael ,

the built-in example is using the Loopback mode.

if you are not using this loopback mode.

Configure correctly your pin (Cf reference Manual)

and you have to take care about TX Mailbox , RX Mailbox and your RX ID.

Best regards

Erwan

lizheng887 · ‎2015-10-13

Posted on October 13, 2015 at 09:55

Hi Erwan,

I configured the Flex_CAN0 PIN: TXD(B[0]) and RXD(B[1]), Supervisor mode. MB 8~31 are set to be TX mailbox.

But after I set the code field 0xc for transmission once, I read the code field back is still 0xc, and noting on the TXD pin.

I need your further help, thanks.

The transmission function is as below:

canmsg_t can_lld_transmit(CANDriver *canp,

canmbx_t mailbox,

const CANTxFrame *ctfp) {

CAN_TxMailBox_TypeDef *tmbp = NULL;

uint8_t mbid = 0;

/*check if mailbox is non empty */

if (!can_lld_is_tx_empty(canp,mailbox)){

return CAN_MSG_WAIT;

}

irqIsrDisable();

/* Pointer to a free transmission mailbox.*/

if (mailbox == CAN_ANY_MAILBOX) {

#if SPC5_CAN_USE_FLEXCAN0

if(&CAND1 == canp) {

for (mbid = 0; mbid < CAN_TX_MAILBOXES; mbid++) {

if ((canp->flexcan->BUF[mbid + CAN_RX_MAILBOXES].CS.B.CODE & 8U) == 1) {

tmbp = (CAN_TxMailBox_TypeDef *)&canp->flexcan->BUF[mbid + CAN_RX_MAILBOXES];

break;

}

#endif

}

else {

tmbp = (CAN_TxMailBox_TypeDef *)&canp->flexcan->BUF[mailbox + CAN_RX_MAILBOXES -1];

}

/* Preparing the message.*/

if (ctfp->IDE) {

tmbp->CS.B.IDE = 1U;

tmbp->CS.B.RTR = 0U;

tmbp->ID.R = ctfp->EID;

}

else {

tmbp->CS.B.IDE = 0U;

tmbp->CS.B.RTR = 0U;

tmbp->ID.R = ctfp->SID << 18;

}

tmbp->CS.B.LENGTH = ctfp->LENGTH;

tmbp->DATA[0] = ctfp->data32[0];

tmbp->DATA[1] = ctfp->data32[1];

tmbp->CS.B.SRR = 1;

tmbp->CS.B.CODE = 0x0C;

irqIsrEnable();

return CAN_MSG_OK;

}

Erwan YVIN · ‎2015-10-15

Posted on October 15, 2015 at 17:20

Hello Michael ,

Could you send me your Test application ?

Could you confirm me your SPC5Studio version ?

you should be on 3.7.0 version.

Best Regards

Erwan