Kinetis MicrocontrollersのトピックRe: EA 24-bit SPI

EA 24-bit SPI

rmaier — Wed, 06 Jun 2018 21:15:59 GMT

Hello,

Is it possible to work with 24-bit words via the SPI port on the KEA64? I am able to read 24-bits no problem, but when I send, there is always a clock cycle break between bytes.

If this is possible, then I will try harder.

Thanks.

Re: EA 24-bit SPI

kerryzhou — Thu, 07 Jun 2018 05:52:50 GMT

Hi Robert,

It's easy to realize it, just don't use the hardware SPI SSEL function.

Use the GPIO function instead of the hardware SPI ssel function.

You can configure C2[MODFEN] as 0:

Or you also can use the other GPIO pin as the SSEL pin.

Before your send the SPI data, pull the SSEL low at first, after the SPI data send finished, then pull the SSEL high.

Wish it helps you!

Have a great day,
Kerry

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Re: EA 24-bit SPI

rmaier — Thu, 07 Jun 2018 13:29:34 GMT

Kerry,

Thanks for the sanity check. I was able to make it work. Now, I just can't clear any faults on the slave. It looks like the message is sent nicely on the oscilloscope. The Kinetis is working just fine, I think I need to sort out some things on the slave side.

Thanks again,

Robert

Re: EA 24-bit SPI

kerryzhou — Fri, 08 Jun 2018 03:04:42 GMT

Hi Robert，

Do you use both the KEA as SPI master and slave?

In the Slave side, please enable the SSEL function, don't do it like master.

Have a great day,
Kerry