fiddler:
I use the onboard LED on pin 13 as a simple visual monitor, to see that, 1; the program is running and 2; how fast the it get around the loop.
fiddler:
I guess my question really is: What is the fastest way of switching an output pin ?
How fast is fast enough? I find it hard to believe you're actually going to notice the LED switching frequency if you're calling this code frequently enough for performance to be an issue.