topic Re: Simple FlexCAN receive example using RTDs in S32 Design Studio

Simple FlexCAN receive example using RTDs

hns80 — Wed, 01 Feb 2023 23:02:33 GMT

After verifying the FlexCAN_Ip_Example_S32K344 example can reach the end of the code, I modified it from loopback to Normal mode and assigned the pins to the CAN transceiver.

I then verified the message was transmitted correctly onto the CAN bus using a bus analyzer.

I removed the call to FlexCAN_Ip_Send() and tested again, this time using the CAN bus analyzer to transmit an 8 byte message to CAN ID 0x14. I expected to see FlexCAN_Ip_GetTransferStatus() succeed, but it never sees the message. I can see the message data reaching the CAN RX pin on the micro.

Is there anything else in the example that needs to change to successfully receive a CAN message?

Re: Simple FlexCAN receive example using RTDs

PetrS — Thu, 02 Feb 2023 08:28:13 GMT

Hi,

you can refer to below example
https://community.nxp.com/t5/S32K-Knowledge-Base/Example-S32K344-FlexCAN-Ip-TX-RX-EnhanceRXFIFO-test-S32DS3-4/ta-p/1536225

BR, Petr

Re: Simple FlexCAN receive example using RTDs

hns80 — Thu, 02 Feb 2023 21:59:54 GMT

I tried to convert this example to use CAN1 instead of CAN0 but get a hard fault at line FlexCAN_Ip_ConfigEnhancedRxFifo_Privileged(INST_FLEXCAN_1, &CAN1_EnhanceFIFO_IdFilterTable[0]);

I changed the following declarations INST_FLEXCAN_0, FlexCAN0_1_IRQn, flexCAN0_Callback, FlexCAN_Config0 to all use FlexCAN1 instead of FlexCAN0. I also updated the payload to use 8 bits instead of 64 bits.

What else do I need to change to make this work with CAN1?

Re: Simple FlexCAN receive example using RTDs

PetrS — Mon, 06 Feb 2023 10:41:12 GMT

Hi,

enhanced RXFIFO is only available on FlexCAN0, so most probably the hard fault comes from this, accessing reserved space.

BR, Petr