S12X CAN bus timing

[Pascalfm]

Hi,

I'm currently setting up the CANbus on a S12XEP100. I've use the code coming with the dev board to start with and see how everything work. i'm using a kvaser CanKing as logger. I achieve to get clear data at 125 kb/s and 250 kb/s but when i tried to increase the speed I only get error frame...

For 125 kb/s I used those value :

BTR0=0x07

BTR1=0x3a

For 250kb/s I used those value :

BTR0=0x03

BTR1=0x3a

i tried 500 kb/s with those value

BTR0=0x01

BTR1=0x3a

i also tried the using the setting from the device inituialization tools but get the same problem.

[kef · Accepted solution]

Maybe your bus driver is too slow for 500kbps, or maybe bus is not properly terminated?

[Pascalfm]

you are right, it's the transceiver speed I totally forgot about that one

I change the chip and everything is right now

thanks