Hi jblackston
About the GPIO_46, are you trying to access in to the Analog Input 2 (A2)? According to the Linux Pin Distribution?
If that is the case you should use the aio_functions . Here are some examples for c,c++, python and javascript. Please let me know if this is what you were trying to do, if not, could you be more detailed in which of the Shield's pins at are you trying to access with the GPIO_46?
Regards;
CMata