topic Re: SPI enable lead time in Kinetis Microcontrollers

SPI enable lead time

vincentchou — Thu, 21 Nov 2013 15:57:52 GMT

Hi! Friend,

Has anyone had any idea about how to adjust the enable lead time for the SPI bus on Kinetis KL25 Freedom Board? We have to enlarge the enable lead time in order to activate the SPI device correctly. Any suggestion is greatly appreciated!

Vincent

Re: SPI enable lead time

Hui_Ma — Fri, 22 Nov 2013 09:33:19 GMT

KL25 without register to add delay to chip select to SCK. Kinetis K series product use DSPI module, which supports set delay between SPI CS to SCK signal.

Thank you for the attention.

Re: SPI enable lead time

vincentchou — Fri, 22 Nov 2013 12:06:18 GMT

Hi! Hui,

Thanks! I got it. I removed the SS pin in the SPI component and use a GPIO to run as a SS pin. In that case, I tried to estimate the potential delay time required to drive the SS line. Do you think there is a potential problem if I used this way?

Vincent

Re: SPI enable lead time

Hui_Ma — Mon, 25 Nov 2013 02:28:59 GMT

Hi Vincent,

Using a GPIO pin to emulate SPI SS pin signal is a good solution way. I also see many customers use that way. There will bring no problem about SPI communication.

Best regards,

Ma Hui

Re: SPI enable lead time

vincentchou — Mon, 25 Nov 2013 04:56:16 GMT

Hi! Mr. Hui,

Thanks a lot for your help!

Vincent