topic Re: mcf54415 flexcan doubts in ColdFire/68K Microcontrollers and Processors

mcf54415 flexcan doubts

angelo_d — Sun, 27 Sep 2020 22:26:28 GMT

Hi all,

trying to have flexcan working, actually enabling ColdFire on flexcan.c in mainline kernel.

I can actually see a data stream generated,

Both

ip link set can0 type can bitrate 500000
ip link set can0 type can bitrate 1000000

produce correct bitrate. On the other bus end i have a USB PEAK, both bus sides are terminated properly.

but "ip link set can0 up" just after produces a kernel frozen situation. I am investigating, if any idea, welcome.

Thanks, angelo

Re: mcf54415 flexcan doubts

Hui_Ma — Mon, 28 Sep 2020 01:46:08 GMT

If there with an issue when MCF54415 wake up from low power mode, FlexCAN0 can not work normally?

If my understanding is correct?

best regards,

Mike

Re: mcf54415 flexcan doubts

angelo_d — Tue, 29 Sep 2020 07:18:38 GMT

Hi mike,

thanks for your reply.

Well, i checked that flexcan0 is not in low power, keeping the other side PEAK usb at 500 Kbit, on "ip link set can0 up", kernel (or ip tool) hangs someway over netlink stuff. But, i can clearly see by oscilloscope flexcan0 sending out arbitration frame and a see remote side providing "ack".

One chance is that for some reason drivers interrupts are not working.

Re: mcf54415 flexcan doubts

Hui_Ma — Wed, 30 Sep 2020 03:25:47 GMT

Hi,

Please check this thread, which has similar issue about MCF54418 FlexCAN0 module.

Wish it helps.

best regards,

Mike