topic Re: S32K312 FLEXCAN NORMAL MODE PROBLEM in S32K

S32K312 FLEXCAN NORMAL MODE PROBLEM

rexoplans — Tue, 28 Nov 2023 18:53:08 GMT

Hello, I'm working on the FlexCAN of the S32K312 microcontroller. I'm trying to send data using the CAN 2.0A frame. In LOOPBACK mode, I am able to enter the TX_COMPLETE and RX_FIFO_COMPLETE interrupts as desired. However, when I switch to NORMAL mode, I don't receive TX_COMPLETE (except for any configuration issues aside from baud rate mismatch). I'm hoping for a frame error, but it doesn't trigger my Error Callback either. I'm using the TJA1055T transceiver, and when I set the en-stb pins to 1, the RTL pin matches the voltage of the VCC pin as expected. On the other end, I'm using the PEAK p-can-usb. If there's a problem due to speed, I expect the pcan-usb status to switch to 'busheavy.' I suspect that the issue might be related to my pin configurations, but I'm not certain. I'm configuring the pins through s32ds. Can you help? Below, I'm providing the version information.

* Autosar Version : 4.7.0
* Autosar Revision : ASR_REL_4_7_REV_0000
* Autosar Conf.Variant :
* SW Version : 3.0.0

Re: S32K312 FLEXCAN NORMAL MODE PROBLEM

PetrS — Wed, 29 Nov 2023 08:30:50 GMT

Hi,

but TJA1055T is low speed fault-tolerant CAN transceiver while PCAN USB is using TJA1044GT which is HS CAN interface. Those two cannot be connected at same bus, it will not work.

BR, Petr

Re: S32K312 FLEXCAN NORMAL MODE PROBLEM

rexoplans — Wed, 29 Nov 2023 10:54:53 GMT

Would it not work even if I use 125kbps speed?

Re: S32K312 FLEXCAN NORMAL MODE PROBLEM

rexoplans — Wed, 29 Nov 2023 11:00:51 GMT

Are you sure about the transceiver? Different explanations have been provided on internet websites

Peak description site : https://www.peak-system.com/PCAN-USB.199.0.html?&L=1

Re: S32K312 FLEXCAN NORMAL MODE PROBLEM

PetrS — Wed, 29 Nov 2023 12:27:39 GMT

Hi,

I have referred to PCAN USB FD interface, but similarly for the one you mentioned. PCA82C251 is HS CAN interface as well.
Due to the different types of termination, you cannot use high speed and low speed/fault tolerant CAN devices in the same network.

BR, Petr