User-Manual for Buttons
Version 0.2 (30-Jan-13)
This program will read the status of the three onboard buttons on the Gertboard
and optionally light the LEDs to reflect the button state. To use this program,
connect jumpers from B1, B2 and B3 in header J3 to pins GP25, GP24 and GP23 in
header J2 respectively. The jumpers on the 'out' area of U3 (U3-out-B1,
U3-out-B2, U3-out-B3) are optional: if they are installed, the leftmost three
LEDS will show the state of the switches.