Where can I find what TRISxxxx and LATxxxx are doing? I'm using them but have no idea what I'm doing.
@Kentj: Basically, TRIS determines if the I/O pin is an input or output. A 1 means the port pin is an input. A zero makes the port pin an output.
LAT is short for LATCH. LAT is always associated with an output pin. For instance, you write to LATDbits.LATD0 and read from PORTDbits.RD5. You set LATDbit.LATD0 to an output by writing a zero to TRISDbits.TRISD0. Conversely, you assign RD5 as an input by writing a 1 to TRISDbits.TRISD5.
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