GPIO

Compiling Python gpio library:

This part is pretty easy. In lib/ run build_lib.sh. This will compile the gpio.so shared object file and move it to lib/gpiolib/.

Odroid-XU Pin IO:

With the directory structure (copy gpiolib/ from lib/).

parent
    ├── gpiolib/
    │    ├── __init__.py
    │    ├── gpio.so
    │    └── gpiolib.py
    └── test.py

You can do pin IO with the following code in test.py

#!/usr/bin/env python
from gpiolib import *


def main():
    sys_init()
    pinMode(27, OUTPUT)
    pinMode(24, INPUT)

    digitalWrite(27, ON)
    print(str(digitalRead(24)) # str() converts to string
    sys_clean()

if __name__ == '__main__':
    main()

You can only read/write to the GPIO/interrupt pins 13-27. Writing to even-numbered pins did not act predictably. However, reading in from even-numbered pins worked just fine.

The pinout is found here and is laid out like this:

                         ^
                         |                        
                        CPU
==========================================================
29..27...................................................1
==========================================================
30..28...................................................2
==========================================================

Also, input_test.py and output_test.py do exactly what their names imply. They ask for a pin to test, and will read/write to itself.