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S12G SPI polarity control

Question asked by Thomas Dowad on Dec 22, 2014
Latest reply on Jan 9, 2015 by iggi

The SPI MOSI pin defaults to high. So when no data is being sent, it goes high. I would like it to be low.

 

So I had a look at the Port Integration section of the Reference Manual, and it seemed this should be possible. The settings would be: wire-or mode, pull enabled, pulldown i.e. for MOSI on port 0:

 

WOMS &= ~0b00100000;  // set PS5 to wire-or mode

PERS  |= 0b00100000; // enable pull resistor on PS5

PPSS |= 0b0010000; // pull down

 

I'm afraid this doesn't work. I assume that is because these configuration bits do not apply when using the pins as SPI.

 

Or have I made an error?

Any other way to make the default state of MOSI low?

 

TIA

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