I'm trying to drive an LED with the pico-SAM9G45 board, and it appears that using GPIO is the way to go to drive a small LED/transistor circuit. I've never used GPIO, and I haven't found much documentation for it on the sam9. I've read up on it on other web sites for other devices, but is there anywhere I can get a more detailed description of how to use it? The pages on the wiki do not go into much detail either.
I followed the instructions in the "Working with GPIOs" section to set the output to 1, but I did not see where any voltage went high on the J14 connector. So I'm guessing that my understanding of how it works is wrong.
Also, could someone point me to a description of how the GPIO convention works? I would not have known that J14 pin 5 was PC19, for example.