topic Re: Dynamic Config in SJA1110 in S32G

Dynamic Config in SJA1110

Abrar_23 — Thu, 03 Jul 2025 07:33:03 GMT

Hi

I am looking to configure the L2 Lookup table in the SJA1110 Switch via Dynamically how can i configure it Dynamically whether it is possible to make dynamic configuration directly
any example ??

Regards
Abrar

Re: Dynamic Config in SJA1110

PavelL — Thu, 03 Jul 2025 10:09:23 GMT

Hello @Abrar_23 ,

This topic has come up a few times recently, so let me provide a brief summary of the available options for dynamically configuring the L2 Lookup Table on the SJA1110 switch.

Both the ECT firmware and the Python script (write_l2_lookup_table.py) are valid and supported approaches. The method you choose depends on your use case — dynamic configuration can be performed either by the internal M7 core or externally via SPI.

1. ECT (Ethernet Control Tool)

Dynamic configuration via external Ethernet (UDP) frames. The internal firmware running on the M7 core receives the configuration and applies it to the switch core.

2. Modified ECT
The ECT source code can be adapted to accept any Ethernet frame format (not just UDP). This allows integration into custom protocols or systems. The internal logic remains the same — the M7 core performs the actual register updates.

3. SPI_HAP (Host Access Protocol)
The write_l2_lookup_table.py script from the host tools demonstrates how to configure the L2 table dynamically via SPI. This approach can be used by any external MCU or host processor. The logic from this script can also be ported to run directly on the internal M7 core if needed.

All of the above methods follow the same principle described in AN12925, section 5.1.3.2. The register-level flow is identical and includes polling the control register, writing to the entry registers, and triggering the update via the control register.

Best regards,

Pavel

Re: Dynamic Config in SJA1110

Abrar_23 — Wed, 09 Jul 2025 09:13:59 GMT

Hello @PavelL

I am trying to configure via SPI_HAP (Host Access Protocol) Can you share me the write_l2_lookup_table.py

Re: Dynamic Config in SJA1110

PavelL — Wed, 09 Jul 2025 13:11:16 GMT

Hello @Abrar_23 ,

the file write_l2_lookup_table.py is a part of SJA1110-EVM Host Tools which can be downloaded from the page SJA1110-EVM Evaluation Board | NXP Semiconductors , in Software section, under Secure files:

Best regards,

Pavel