L9963E BMS Eval Board SPI data on the bus

[VP.6]

Hi,

I am trying to communicate with BMS IC on our developed board and I donot see the communication happening with BMS IC despite of following all the instructions 

I have a L9963E BMS Eval board for reference,

I have tapped out the SPI frames on the bus to see the data

I could see for the 5 byte of frame data 4 bytes are going first and 2 byte is going after a delay of around 2.2 us

when I have fed the SPI  API spi_lld_exchange with 5 bytes the data goes out in one after the other continously

Is there any specific reason why the data is send in this way?

I do not see any specific section mentioning any where in L9963E data sheet regarding this?

Kindly let me know what could be the reason for this do I need to send the data in this way?

Also I could see the clock frequency is varying in between 8MHz and 12MHz if see the clock in the image it is not pulsated at same frequency

[Erwan YVIN]

Hello ,

sorry for the delay.

Did you solve your issue?

Do you RLA drivers SPI ?

            Best regards

                         Erwan

[prathap_07]

did you solved that issue .

How you developed that spi communication from externel mcu ?

[Max VIZZINI · Accepted solution]

if you are using an SPC5 microcontroller you can refer to the BMS example in AutoDevKit by importing existing example. You can then compare with your code.

www.st.com/autodevkitsw