topic Re: CAN FD Interrupts on MPC5748G in MPC5xxx

CAN FD Interrupts on MPC5748G

OwenH — Tue, 24 Aug 2021 10:54:47 GMT

Hello,

I'm implementing CAN FD on the MPC5748G and I don't seem to be getting an interrupt when a message is sent or received. I can successfully send messages as well as receive them from checking the memory and CANAlyser and I can see that the corresponding bits are set in the IFLAG registers. Whether I set or clear the corresponding bits in the IMASK registers for that buffer however the ISR doesn't seem to fire.

I'm calling xcptn_xmpl() so the ISRs should be enabled and have my routines in the vector table for the buffers on that CAN port. Is there anything else I should check as to why the interrupts might not be happening? Other interrupts are working so it seems to just be something with my CAN FD code.

Many thanks,

Owen

Re: CAN FD Interrupts on MPC5748G

BenMW — Tue, 24 Aug 2021 11:01:06 GMT

Do you enable the interrupts and assign the callback function?

void FLEXCAN_DRV_InstallEventCallback(uint8_t instance, flexcan_callback_t callback, void *callbackParam)

and (if needed)

void FLEXCAN_DRV_InstallErrorCallback(uint8_t instance, flexcan_error_callback_t callback, void *callbackParam)

Re: CAN FD Interrupts on MPC5748G

OwenH — Tue, 24 Aug 2021 11:07:55 GMT

I enable the interrupts by setting the bits in the IMASK registers for the CAN Port and I've referenced the callback directly in the vector table. Do I also need to set them up using those function calls? If so where is that function defined?

Re: CAN FD Interrupts on MPC5748G

BenMW — Tue, 24 Aug 2021 11:13:04 GMT

You can find the functions in flexcan_driver.c/.h files. I'm new to NXP so I cannot give you information if your vector table is correct. But you can compare your settings with the implementation of the driver functions.

Re: CAN FD Interrupts on MPC5748G

PetrS — Tue, 24 Aug 2021 11:34:52 GMT

Hi,

set also interrupt core and priority for each vector using INTC PSR register e.g.

INTC.PSR[604].R = 0x8001;

BR, Petr

Re: CAN FD Interrupts on MPC5748G

OwenH — Tue, 24 Aug 2021 13:36:43 GMT

That was it! Thank you for your help!

Owen