MCX MicrocontrollersのトピックRe: MCXN947 canbus activation

MCXN947 canbus activation

stevenlutz — Fri, 10 Jan 2025 03:10:28 GMT

I'm using the FRDM-MCXN947 canbus loop back example as a starting point for sending and receiving canbus data.

However, when I disable loopback and mix the pins, the mcu still doesn't seem to be connected to the canbus pins.

Data output doesn't get detected on the oscilloscope.

Is there something else that I'm missing g for the loopback example to be able to communicate with other can nodes?

Re: MCXN947 canbus activation

Harry_Zhang — Fri, 10 Jan 2025 07:43:18 GMT

Hi @stevenlutz

If you want to communicate with other CAN nodes using FRDM-MCXN947 board,

You can refer to flexcan interrupt demo.

Hope this will help you.

Harry

Re: MCXN947 canbus activation

stevenlutz — Fri, 10 Jan 2025 23:54:16 GMT

I've looked at all 3 CAN demos.
Getting the loopback demos to be active on the wire doesn't work when disabling the loopback mode.
Can you advise why?

The interrupt demo also doesn't put data on the wire when switching to extended can and disabling can FD.

Re: MCXN947 canbus activation

Harry_Zhang — Mon, 13 Jan 2025 03:47:39 GMT

Hi @stevenlutz

I changed the interrupt demo.

I switched the extended can and disable can FD.

You can see that there is data transmission on the CAN bus.

Harry

Re: MCXN947 canbus activation

stevenlutz — Sun, 19 Jan 2025 01:26:06 GMT

I did the same thing, but there was a bit of code earlier in the demo that I didn't understand.
After lookingat the datasheet for the can Tranciever I saw that the initialization function needed to stay in.