from time import sleep
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(2, GPIO.OUT)
while 1:
GPIO.output(2, False)
sleep(2)
GPIO.output(2, True)
Perhaps I'm not understanding what you want exactly, you seem to know what you're doing.
The problem is in pinmuxing. If you want to change the pins from their default modes, you're in for a world of pain. Systems on a chips (SoCs, basically run everything portable these days) are optimized to the point where different die pins can have different modes (GPIO, LCD framing, USB framing, might all be available, one at a time, on the same pin). Switching between them requires mucking about in the kernel and reconfiguring hardware and is, at least in my experience, incredibly painful.
