GPIO

[jomoengineer]

I know this post is a bit old, I'm just getting started with the Pine64 board I purchased a bit ago and looking at the Pi-2 GPIO connections, these are similar to the Rapberry Pi and Beaglebone Black. Derek Molloy has a couple of books for each board, as well as a website for each, and the data in the books could be applied to the Pine64 board. One thing is that the data for the GPIO mappng can be obatined by looking under the '/sys/kernel/debug/pinctrl/' folder. The mappings for the Pi-2 can be found in '/sys/kernel/debug/pinctrl/1c20800.pinctrl/pinmux-pins'. This requires root access to get the pinctrl though.

Example:

# cat pinmux-pins

Pinmux settings per pin
Format: pin (name): mux_owner gpio_owner hog?
pin 32 (PB0): 1c28800.uart (GPIO UNCLAIMED) function uart2 group PB0
pin 33 (PB1): 1c28800.uart (GPIO UNCLAIMED) function uart2 group PB1
pin 34 (PB2): 1c28800.uart (GPIO UNCLAIMED) function uart2 group PB2
pin 35 (PB3): 1c28800.uart (GPIO UNCLAIMED) function uart2 group PB3
pin 36 (PB4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 37 (PB5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 38 (PB6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 39 (PB7): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 40 (PB8): 1c28000.uart (GPIO UNCLAIMED) function uart0 group PB8
pin 41 (PB9): 1c28000.uart (GPIO UNCLAIMED) function uart0 group PB9
pin 64 (PC0): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 65 (PC1): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 66 (PC2): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 67 (PC3): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 68 (PC4): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 69 (PC5): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 70 (PC6): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 71 (PC7): (MUX UNCLAIMED) 1c20800.pinctrl:71
pin 72 (PC8): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 73 (PC9): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 74 (PC10): (MUX UNCLAIMED) (GPIO UNCLAIMED)

I have configured Pin 71 so shows being claimed by '1c20800.pinctrl:71'

The User Guide is very cool.

Cheers