MPC5xxxのトピックKIT33908MBEVBE CAN

KIT33908MBEVBE CAN

manuelaielo — Mon, 01 Aug 2016 10:41:07 GMT

Hello,

I'm using the KIT and I can configure the SBC and answer correctly to the WD

I noticed that the behavior of CAN is different with or without the debug jumper

The power of CAN CAN_5V is high in both mode

Without debug jumper the pin CANH and CANL are inactive and with level 0V while in the pin CAN_TX there is signals

With debug jumper the signal arrives correctly also to CANH and CANL

There is some other particular configuration on EVB or on SBC to apply?

Thank you in advance,

Best Regards

Manuela

Re: KIT33908MBEVBE CAN

PetrS — Tue, 02 Aug 2016 08:46:27 GMT

Hi,

When the Debug mode is activated (debug jumper set) the CAN transceiver is set to Normal operation mode and you are able to communicate normally.

Without this jumper the CAN transceiver is kept in Sleep mode by default. In that case, the CANH and CANL pins are pulled down to GND via the internal R_IN resistor, the TXD and RXD pins are pulled down to GND, both driver and receiver are OFF.

You need to write to the CAN_LIN MODE Register and set CAN_mode_1:0 bits to configure Normal operational mode.

BR, Petr

Re: KIT33908MBEVBE CAN

lmonologue — Wed, 21 Dec 2016 07:32:44 GMT

Hi, Petr

When the Debug mode is activated (debug jumper set) the CAN transceiver is set to Normal operation mode. Under the circumstances,do I need to initialize the SBC chip to enable transceiver by codes?

Thanks a lot.