Interrupt on driver station digital input

[willson.thomas]

Originally Posted by Nameless

Is it possible to attach an interrupt to a digital input on the driver station? I would like to use an encoder as an input device, and I don't believe there is any other way use them than with interrupts. I looked through the WPILib beta 5 code and didn't see anything about driver station interrupts in DriverStation.h/cpp and FRCComm.h.

If this isn't possible, I'm considering using a microprocessor to take in the encoder readings, keep track of the encoder offset, and output that as a PWM signal to the driver station analog input. For example, if the encoder is turned halfway around, the microprocessor would send a 50% PWM to the driver station. Would this work correctly? Also, does the driver station have a power source I could use? (As I understand it, external power is not allowed.)

Have we been allowed to create custom processing circuits and attach them to the OI in past years?

Portable computing devices
must not be connected to joystick input ports on the Operator Interface.

Where do they draw the line?