S32KのトピックRe: CAN FD BUS LOAD

CAN FD BUS LOAD

faress_mansouri — Fri, 24 Jul 2020 13:30:57 GMT

hello,

to calculate the bus load in CAN i use this equation :

=> per example for a baud rate of 500 kb/s :

i calculate the number of bits i have received (frames_size) and then to calculate the bus load for 1 second i use :

(frames_size * 100)/(500 * 10^3) = XX%

my question is how can i calculate the bus load in CAN FD since im using BRS(bit rate switch) : 500 kb/s for nominale phase and 2Mb/s for data phase ?

Thanks,

Re: CAN FD BUS LOAD

PetrS — Mon, 27 Jul 2020 11:35:25 GMT

Hi,

you can find formula here CAN FD - Wikipedia

BR, Petr

Re: CAN FD BUS LOAD

faress_mansouri — Mon, 27 Jul 2020 12:31:42 GMT

Thanks for your reply, i've already seen that formula in wikipedia but i can't understand it, it's not clear.
can you please share other pages that explains how to calculate the busload in CAN FD, or re-write that formula clearly.

Re: CAN FD BUS LOAD

PetrS — Tue, 28 Jul 2020 07:37:12 GMT

Hi,

I think it is quite clear. It added up bits in frame (in arbitration and data phases) and calculate a time of a message using different bitrates for both phases. Then this message time duration is divided by time of measurement, which should give bus load.

BR, Petr

Re: CAN FD BUS LOAD

faress_mansouri — Tue, 28 Jul 2020 08:46:09 GMT

Thanks for your help ^^