KEA64 SPI Communication problem

[ahnjoseph]

Enviroment : KEA64 EVB Kit --> Onsemi LED Driver with SPI Communication

Tool : KDS with P.E

Problem : The SS pin just one byte continue low state

                 Must be "SS Pin" to continue Turn Low (until complete 2byte)

                 I know that is Clock phase setting "Change on leading edge"

                Then I can chip selecting togging " No"

                Unfortunately, My target PCB can`t read

                when I setup [Clock phase setting : “Change on leading edge"]     

                So I tried Clock phase setting “Capture on Leading edge”

                then [chip selecting togging " Yes" ]

                And Other a GPIO port setting Output

               A GPIO port use to connecting target B.D SS port 

              The GPIO port sync to SPI communication time domain

              then I can transferdata.

   I want to setup Clock phase setting "Change on leading edge" & chip selecting togging " No"

   How can I setting above my desire ?

   Please look below my picture

   Blue line : GPIO out

   Line No2 : SS pin

   Line No3 : MISO

   Line No1: MOSI

   Line No0: CLK

"

[isaacavila]

Hello Ahn,

In order to send more than 8 bits as the same transaction SS must not be controlled by SPI module, otherwise, SPI module will driver high this signal once 8 bits are sent. KEAxxx has the hability to manage SS signal by GPIO for these kind of use cases.

In this post, there is a similar issue (user wants to receive more than 8 bits per transaction) and SPI code for sending 16-bits data is provided: https://community.nxp.com/thread/358663

I hope this helps!

Regards,

Isaac