LPC1778 - SSPn question

[lpcware]

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



Thanks,
Enrico Migliore

[lpcware]

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

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Quote: leluno
you need a nand logic chip

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Ok, thank you.

I did that.

Enrico Migliore

[lpcware]

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

[lpcware]

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.