MPC5xxxのトピックRe: mpc5748g canfd receive

mpc5748g canfd receive

chenxiubo — Mon, 03 Apr 2017 14:16:17 GMT

Hi,

I'm using mpc5748g canfd module to receive lots of messages. But canfd module can't use Receive FIFO function.

Now I am using one buf such as buf[3] to receive these messages(not rx interrupt), I found some messages that missing.

My project need to receive can2.0b messages and canfd messages from car's controllers through can bus. If there are not canfd messages, I can using RX FIFO interrupt function to receive messages in case of losing messages. But there are canfd messages(canfd cannot use FIFO function).

Here are my questions: Should I use Rx Interrupt function without FIFO? How can I configure registers?

Or if I don't need Rx Interrupt function to receive meesges,how can I configure registers?

Thank you!

Best Regards!

Tom_Chen

Re: mpc5748g canfd receive

PetrS — Wed, 05 Apr 2017 12:05:30 GMT

Hi Chen,

Yes, the Rx FIFO must not be enabled when CAN FD feature is enabled.

However using the RX interrupt is simple, each one of the Message buffers can be an interrupt source, if its corresponding IMASK bit is set. Assuming Interrupt controller is properly configured too.

So for your used MB3 set for RX, the interrupt is enabled when IMASK1 = 0x00000008;

BR, Petr

Re: mpc5748g canfd receive

chenxiubo — Thu, 06 Apr 2017 16:02:35 GMT

Hi,Petr Stancik

I followed your advice and write two mpc5748g demos for canfd module using S32 IDE: one is no interrupt and it works OK(CAN0 MB0 transmit and CAN1 MB0 receive. I checked the CAN1 MB0's buffer( or array for RxDATA[j] ) and it's right). The other demos I used CAN1 MB0 receive interrupt, but it's failed, it cannot enter into receive interrupt(1. I set interrupt core and priority ,2.enabled interrupt for CAN1 MB3( IMASK1 = 0x00000008;)

I cannot find the reason why it cannot be enter into receive interrupt.

Please see the attachment.

Best Regards,

Tom_Chen

Re: mpc5748g canfd receive

PetrS — Fri, 07 Apr 2017 12:17:31 GMT

Seems you do not configure INTC at all in your code. The xcptn_xmpl() should be called.

Look at this demo example https://community.nxp.com/docs/DOC-332504

BR, Petr

Re: mpc5748g canfd receive

chenxiubo — Wed, 12 Apr 2017 14:04:05 GMT

Hi,

I follwed your advice and added xcptn_xmpl(), But it cannot enter can receive interrupt.

First, I used CAN0 BUF[0] transmit message, CAN[1] BUF[0] receive interrupt, it could enter can receive interrupt.

Second,I used CAN0 BUF[0] transmit message, CAN[1] BUF[3] receive interrupt, it could not enter can receive interrupt.

I checked again and not find any problem,could you please help me?