Agorobots - Thursday plan
Using a switch as input.
Any pin on the PIC can also be used as an input, so that your robot
can get information about the world around it. By default, a port B
input (the A ports are harder to use because they don't have a
default) is at 5 volts, and the corresponding bit in memory will be
equal to 1 ("set"). If you connect it to ground, then the bit
in memory will change to a 0 ("clear"). Here's how you can read the
ports in a program:
useinput portb,2 ; use B2 as an input
btfss portb,2 ; skip the next line if B2 is "set" (1)
goto it_was_clear ; go to a different place if B2 is "clear" (0)
; ... anything in here will be run if B2 was "set" ...
goto done_with_test ; this skips the next section
; ... anything in here will be run if B2 was "clear" ...
; ... the rest of your program goes here ...
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