topic Re: LPC1778 - SSPn question in LPC Microcontrollers

LPC1778 - SSPn question

lpcware — Wed, 15 Jun 2016 17:31:24 GMT

Content originally posted in LPCWare by wwwenrico on Tue Apr 22 00:34:11 MST 2014
Hi,

I'm gonna use one of the three SSP interfaces of the LPC1778.

I need to use it as a SLAVE interface.

The external SSP master has a SSEL signal which works the opposite way:

- it goes high when a data transfer starts

- it goes low when the data transfer ends.

QUESTION
----------------
Is there any way to change the default polarity of the SSEL signal of the SSP interface?

Thanks,
Enrico Migliore

Re: LPC1778 - SSPn question

lpcware — Wed, 15 Jun 2016 17:31:25 GMT

Content originally posted in LPCWare by Pacman on Wed Apr 23 11:40:49 MST 2014
For master, you usually use the CPOL and CPHA bits.
I believe that would be the way to do it for slave mode as well, but I have not tried it.

Re: LPC1778 - SSPn question

lpcware — Wed, 15 Jun 2016 17:31:25 GMT

Content originally posted in LPCWare by leluno on Fri May 02 01:27:04 MST 2014
you need a nand logic chip

Re: LPC1778 - SSPn question

lpcware — Wed, 15 Jun 2016 17:31:26 GMT

Content originally posted in LPCWare by wwwenrico on Thu Oct 16 03:22:48 MST 2014

Quote: leluno
you need a nand logic chip

Ok, thank you.

I did that.

Enrico Migliore