SJA1105QEL config

[BravoEven]

Hello Everyone

      I am configing my SJA1105QEL via a SPI interface, I'v got the static config stream via tools like figure shows, but I cannot get the "CONFIGS" flag set at address 0x0001:bit 31 after writing the stream into the core. Are there any point I'v missed? Help please.

      Thanks.  #SJA1105 

[Jack22]

HI ,Lukas

I want to use the SJA1105 Ethernet switching chip to realize the time synchronization function based on the 1588 protocol, how should I proceed in the design stage, can give the implementation method from both hardware design and software design; if I need to configure the software, I will choose the SPI interface, the current reference data sheet is the SJA1105PQRS, but it is not enough to support me to complete the configuration of the The current reference data sheet is SJA1105PQRS, but it is not enough to support me to complete the understanding of how to realize the above function, please give help, thank you very much!

[BravoEven]

By the way ,I just write the stream into the SPI interface one by one(for example: first word is the Device ID) and haven't cared about the structure of write fram shown in chapter3 of UM11040

[lukaszadrapa · Accepted solution]

Hi @BravoEven 

you need to send control word first before the stream. Did you send it? It's also mentioned in the user manual:

There's a sample code for this board:

https://www.nxp.com/design/development-boards/automotive-development-platforms/hardware-tools-access...

Link to the code is:

https://www.nxp.com/webapp/Download?colCode=SJA1105SMBEVM-SDK-FIRMWARE&appType=license

And here you can find a function which prepares data to be sent via SPI. As you can see, it creates control word at the beginning and then it appends the byte stream:

The function can be found in enet_app.c file.

I guess that this could be the source of problem.

Regards,

Lukas

[BravoEven]

Dear Lukaszadrapa：

     Your advice is very helpful！ Thank you very much for the demo code!

      Have a good day!