Running out of I/O - HELP! | Arduino Compatible Compiler for LabVIEW Discussions | Forum

I'm already using the following I/O lines on my PWS Stamp board:

GPIO5/GPIO13 = Soft Serial Tx/Rx

GPIO12 = 1-wire Temperature Sensor Input

GPIO14 = I2C Clock Output

GPIO2 = I2C Data In/Out

GPIO1/GPIO3 = USB Programming Port Tx/Rx

So this leave me with only two I/O lines left

GPIO16 = Used to control a LED on the board and cannot be used as an interrupt so I cannot use this.

This leaves only pin GPIO15 to monitor the Open drain output Interrupt output from a MAX7318 IC.  I have a 10K tie-up resistor to 3.3V on this line, but according to the PWS schematics there is a 12K Pull-down to ground and sure enough I end up with a voltage divider on this line of about 1V.  Also this seems to affect the programming of the PWS Stamp and this line is labelled "CS" so can I use it as a general purpose input or is it used by the PWS Stamp for something else?

Have a run out of I/O?

Chris