upsd33xx spi interface problem

wdcai · ‎2004-05-20

Posted on May 20, 2004 at 23:06

wdcai · ‎2011-05-17

Posted on May 17, 2011 at 12:00

Hi,All

There is a host spi controller in upsd33xx series,but only one spi slave chip select signal is provided, how can I connect another spi device? I can use cd4051 cmos swicth to do this, but I want to know whethwer GPIO pins such like P1 port can be used as chip select signals?

Thanks!

sjo · ‎2011-05-17

Posted on May 17, 2011 at 12:00

just clear SSEL bit to disable the CS line, then you can use GPIO to manually set the CS line of your choice before loading the data.

Regards

sjo

wdcai · ‎2011-05-17

Posted on May 17, 2011 at 12:00

that is to say those signal spicclk,spirxd,spitxd will run normally in SPI interrupt mode using GPIO as chipselect signals of other spi slave device! is it OK?