Python script to control/open a Partner Tech SP-850 cash drawer

drawer_control_SP-850.py

# Control a Partner Tech SP-850 cash drawer
# Needs root

import portio
import time

# request permission to I/O port range
portio.ioperm(0x5a8, 4, 1)

# Has to be 32bit access, otherwise the EC won't respond
def open_drawer():
    portio.outl(0xFF, 0x5a8)  # (val, port)
    time.sleep(0.05)
    portio.outl(0xFE, 0x5a8)  # bit 0 -> 0 open drawer A, bit 1 -> B
    time.sleep(0.05)
    portio.outl(0xFF, 0x5a8)  # reset to 1 according to manual

def is_drawer_open():
    return not (portio.inl(0x5a8) & 0x40)

if __name__ == "__main__":
    open_drawer()