I just received my board. Very exciting!
Looking at the Schematic, there are only 9 pins labeled GPIO, but a bunch of other pins that have designations for I2C, SPI, PWM on them. Can I use all of these pins as GPIO... in fact how many GPIO pins are available on this board for me to use?
Also, how quickly can I access these pins from my C-code: for instance, if I wanted to implement a software I2C or something like that?