If using the hw SPI is the ss pin then free?

Guest · Posted: Tue Oct 13, 2009 1:42 pm

When using the SPI hardware module:

SDI,SDO,SCk 3 pin mode. Is the SS pin the free to use as normal I/O?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

It should be available for normal i/o.

ckielstra · Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands

As an additional note:
The Slave Select pin is only active when the SPI hardware is used as a slave. In a master this pin is never used and free for normal I/O operations.

Don't place the SS_DISABLED define in your spi_setup call for a SPI master or it will create an invalid setup.

Torello · Joined: 29 Sep 2006 Posts: 117

Hi Guest,

Beware when you want to use this pin as an input!!

http://www.ccsinfo.com/forum/viewtopic.php?t=31562&highlight=

Edwin.