topic Re: S32G3 LLCE CAN2CAN Fail in S32G

S32G3 LLCE CAN2CAN Fail

canhe — Tue, 23 Dec 2025 08:33:28 GMT

各位NXP专家，大家好！

背景信息：我的项目现在需要使用 LLCE 的 CAN2CAN 路由功能，从 BCAN1 接收消息将其路由到 BCAN2，绕过 Autosar CAN 通信协议栈。我已经按照手册配置了 EB，但测试后发现没有消息被转发。我的 LLCE 固件版本为 S32G_LLCE_1_0_7。

调试后发现，CAN驱动初始化正常，路由表也设置正确，TXMB也足够。LLCE固定也已成功加载。所以我不知道问题出在哪里。请问您能否指导我如何进行故障修复，以及是否有任何合理的建议？

Re: S32G3 LLCE CAN2CAN Fail

chenyin_h — Wed, 24 Dec 2025 10:51:06 GMT

您好

1. 请问您使用的RTD版本是多少？

2. 您使用的是参考板还是自己设计的板卡？

3. 您试过默认的CAN2CAN 示例程序吗？是否也有问题呢？

Chenyin

Re: S32G3 LLCE CAN2CAN Fail

canhe — Thu, 25 Dec 2025 11:26:29 GMT

Hi,
1.We are using MCAL version RTD_4.4_4.0.2 and our own design board.
2.Thank you for your reply. The problem has been solved. Reducing the TXMB value used for routing on the target controller solved the issue; 16 appears to be the maximum TXMB value for each CAN controller.
3.I'd like to ask further: is there a way to disable the routing function of a specific CAN controller? Could you provide a relevant function or EB configuration option?

Re: S32G3 LLCE CAN2CAN Fail

chenyin_h — Fri, 26 Dec 2025 10:35:31 GMT

Hello, @canhe

很高兴问题得到了解决。

关于您的新问题，disable the routing function of a specific CAN controller，请问您是想在CAN2CAN操作中停止对某个端口的转发？还是某种其他的操作，，麻烦您详细描述一下需求

Chenyin

Re: S32G3 LLCE CAN2CAN Fail

canhe — Fri, 26 Dec 2025 10:48:17 GMT

Hi,Chenyin
Yes, I want to stop the forwarding of a certain port in the CAN2CAN operation. Normally, after receiving the 0x123 message on BCAN1, it is directly routed to BCAN2 for transmission. Now (assuming there is such a switch), if the routing is turned off, BCAN1 stops forwarding the 0x123 message, but BCAN1 can still receive other messages normally. Simply turning off its routing function is sufficient.

Re: S32G3 LLCE CAN2CAN Fail

chenyin_h — Tue, 30 Dec 2025 02:24:46 GMT

Hello, @canhe

Thanks for the clarification.

Sorry that there is not a similar out-of-box example for your direct reference, I suggest referencing the LLCE Firmware User Guide, it is with detailed description of the APIs implemented from the FW perspective, for example, the

LLCE_CAN_CMD_REMOVE_AF_DESTINATION command could be sent to the LLCE to remove an existing destination rule, you may check the corresponding APIs to check which one best fill your specific requirements。

Chenyin

Re: S32G3 LLCE CAN2CAN Fail

canhe — Wed, 31 Dec 2025 02:58:13 GMT

Hi,Chenyin
Thank you for your reply. I will give it a try.
There is one more point that needs to be confirmed. The internal selection method of HRH in LLCE is as follows: first, search in the ordinary filter table based on the index; second, search in the advanced filter table based on the index, right?

For example, I created two HRHs on BCAN1. HRH1 does not associate with any routing options and does not filter packets. The generated code is a regular filter. HRH2 is associated with routing options and has a filter ID of 0x32. The generated code is an advanced filter. The object ID of HRH2 is smaller than that of HRH1. After testing, when 0x32 packets are received, they are always processed by HRH1, resulting in a routing failure.

Re: S32G3 LLCE CAN2CAN Fail

chenyin_h — Mon, 05 Jan 2026 06:28:47 GMT

Hello, @canhe

Thanks for your reply.

A CAN message can only have one CAN ID, so it can only match one filter(In situation without CAN ID overlap), so the two filters are with CANID overlap? May I know the detailed settings of the two filters defined for one channel?

Chenyin

Re: S32G3 LLCE CAN2CAN Fail

canhe — Wed, 07 Jan 2026 09:47:57 GMT

Hello,Chenyin

Yes, the two filters currently configured have overlapping messages.

HRH1:HRH1

HRH2:HRH2

We know that it is best to configure a filter for each message ID. However, since the project is acting as a gateway ECU, there are many messages and thus many HRHs need to be configured. This makes the work very tedious. So, it is sufficient to establish two separate HRHs for the routing messages and the host messages. However, from the results, the messages are always received and processed by the HRHs that do not have the relevant routing options.

Re: S32G3 LLCE CAN2CAN Fail

chenyin_h — Fri, 09 Jan 2026 08:32:26 GMT

Hello, @canhe

Thanks for your reply.

For the situation you mentioned, the filter without advanced feature enabled will be firstly matched, which matches your testing results.

Generally, it is not recommended to have such overlaps in the configuration. It is better for each ID to have a fixed filtering rule.

Chenyin