topic FlexCAN example for DEVKIT MPC5744P using CAN0 in S32 Design Studio

FlexCAN example for DEVKIT MPC5744P using CAN0

vernonhawes — Tue, 21 Aug 2018 14:55:39 GMT

I'm trying to send and receive CAN signals periodically using the DEVKIT MPC5744P on the CAN0 port. The FlexCAN example program included with the S32 Design Studio for this DEVKIT sends signals on CAN2 with loopback. I've tried to modify the same code to send and receive on CAN0 since this port has the transceiver signals with CANH, CANL and Gnd output pins with which I can monitor the CAN communication. I'm trying to monitor the CAN bus using a Vector CANcase HW and Vector CANoe software. But all I see is error frames even though I've connected a termination resistance of 120 ohm across the CANH and CANL.

I'm not sure what is wrong with my code.

Could someone please share example code for the above scenario?

Also are there any hardware/jumper pin settings that need to be taken care on the DEVKIT?

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

mikedoidge — Wed, 22 Aug 2018 20:25:23 GMT

Hello vernonhawes@gmail.com‌,

There are 3 possible examples that you could be working from. 2 are from the SDK, and one is without SDK.

Which example are you using as your reference?

Would you mind providing your project from the workspace so we could examine it?

If you are using the SDK, then perhaps there are some settings in the SDK which you need to change, but missed.

There's no jumpers which directly affect the CAN. You can check for yourself. https://www.nxp.com/downloads/en/schematics/SCH-29333.pdf

Best Regards,

Mike

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

arthur_grondine — Tue, 30 Mar 2021 00:01:13 GMT

Hello - this question was never answered and I have the same problem.

How to use CAN0 - don't want loop back ok. Just want CAN0.

This should be easy - but it isn't. There has to be something simple - not sure why there isn't a demo for this as it seems the pins for CAN0 are designed for easy using.

Thanks,

={> Art

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

jiri_kral — Tue, 30 Mar 2021 06:21:52 GMT

Hi,

For CAN bus functionality you need to connect external 12V power supply to your board, are you using it or your board is powered from USB?

Jiri

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

arthur_grondine — Tue, 30 Mar 2021 10:33:31 GMT

Ah Ha! Any jumpers I need to set for external power? Can I still debug with the USB interface to PC?

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

arthur_grondine — Tue, 30 Mar 2021 11:11:31 GMT

I added the 12V power supply still no CAN0 activity.

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

arthur_grondine — Tue, 30 Mar 2021 14:11:28 GMT

I made some progress - the directions are incomplete. I found the 4 jumpers and was able to debug with the usb little connection while using the 12V source for the analog. But this debugger isn't well behaved - can't reliably single step - jumps around, not good.

So I tried to use the USBMultilinkFx - on the JTAG port. But how to power up the digital section (CPU). I tried various jumper configurations ... no luck.

This is so frustrating ..... please provide clear directions on how to actually use this board to debug in real time CAN bus application.

Thanks,

={> Art

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

jiri_kral — Tue, 30 Mar 2021 14:21:45 GMT

Hi,

here are details related to power settings:

What about optimizations? If optimizations are enabled, the debug may behave in strange way.

Jiri

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

arthur_grondine — Tue, 30 Mar 2021 14:46:03 GMT

Hi - This doesn't explain how to use the JTAG port. It covers using the built in port only.

Re: FlexCAN example for DEVKIT MPC5744P using CAN0

arthur_grondine — Tue, 30 Mar 2021 14:54:56 GMT

Turning of optimizations helped. Still no CAN0 working yet. The sample project doesn't work either: