KEA64 SPI Communication problem

ahnjoseph — Tue, 23 Aug 2016 06:48:23 GMT

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

Re: KEA64 SPI Communication problem

isaacavila — Thu, 25 Aug 2016 21:31:12 GMT

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

topic KEA64 SPI Communication problem in Kinetis Microcontrollers

KEA64 SPI Communication problem

Re: KEA64 SPI Communication problem