FRDM-KL05Z SPI problem?

[nomora]

Hi all,

I used SPI to read a 12-bits device. Thus, the SPI read 2 bytes to finish the read.

However, something strange is, if I set the SPI clock rate faster than 0.333525us, then the "chip select" will still toggle even I set it as no.

It cause a wrong reading if CS was toggled between characters transmission.

Below waveform shown the result when set the clock rate to 0.333525us.

The SPI read 2 bytes data continually without CS toggling.

Below waveform shown the result when set the clock rate to 0.083381us.

The CS will be toggling between characters transmission.

Hope someone can help one this.

Thanks.

Gary.

[carloshass]

Gary,

I'm having the same problem using KE06Z Dev Board.

Did you solved it? How?

thanks for you attention!

Regards,

Carlos Hass

[jeremyzhou]

Hi Gary,

I've had a brief look through your question, could you please upload your project?

If I have your porject, it's convenience to me figure out the problem.

I'm looking forward to your reply.

Have a nice day!

Best regards,

Ping