Data Sheet

ManualsBrands4D Systems ManualsRaspberry Pi Accessories / HATs3.2" Primary Display for Raspberry Pi A+/B+/2

4D SYSTEMS 4DPi-32-II Primary Display – Raspberry Pi Compatible

4DPi

-32

-II Primary Display

– Raspberry

Example for Shutdown and Reset buttons, for Python

#!/usr/bin/python

import array, fcntl, os

from time import sleep

# test program to Shutdown or Restart Pi using buttons on 4D Systems 4DPi displays

#LCD4DPI_GET_KEYS = -2147202303

_IOC_NRBITS = 8

_IOC_TYPEBITS = 8

_IOC_SIZEBITS = 14

_IOC_DIRBITS = 2

_IOC_DIRMASK = (1 << _IOC_DIRBITS) - 1

_IOC_NRMASK = (1 << _IOC_NRBITS) - 1

_IOC_TYPEMASK = (1 << _IOC_TYPEBITS ) - 1

_IOC_NRSHIFT = 0

_IOC_TYPESHIFT = _IOC_NRSHIFT+_IOC_NRBITS

_IOC_SIZESHIFT = _IOC_TYPESHIFT+_IOC_TYPEBITS

_IOC_DIRSHIFT = _IOC_SIZESHIFT+_IOC_SIZEBITS

_IOC_NONE = 0

_IOC_WRITE = 1

_IOC_READ = 2

def _IOC(dir, type, nr, size):

# print 'dirshift {}, typeshift {}, nrshift {}, sizeshift

{}'.format(_IOC_DIRSHIFT, _IOC_TYPESHIFT, _IOC_NRSHIFT, _IOC_SIZESHIFT)

ioc = (dir << _IOC_DIRSHIFT ) | (type << _IOC_TYPESHIFT ) | (nr << _IOC_NRSHIFT

) | (size << _IOC_SIZESHIFT)

if ioc > 2147483647: ioc -= 4294967296

return ioc

#def _IO(type, nr):

# return _IOC(_IOC_NONE, type, nr, 0)

def _IOR(type,nr,size):

return _IOC(_IOC_READ, type, nr, size)

#def _IOW(type,nr,size):

# return _IOC(_IOC_WRITE, type, nr, sizeof(size))

LCD4DPI_GET_KEYS = _IOR(ord('K'), 1, 4)

#print 'ssd {} {:12} {:0>8x} {:0>32b}'.format(ssd1289, hex(ssd1289), ssd1289,

ssd1289)

buf = array.array('h',[0])

with open('/dev/fb1', 'rw') as fd:

while True:

fcntl.ioctl(fd, LCD4DPI_GET_KEYS, buf, 1) # execute ioctl call to read the

keys

keys = buf[0]

if not keys & 0b00001:

break

if not keys & 0b10000:

os.system("sudo shutdown -h now")

break

if not keys & 0b01000:

os.system("sudo reboot")

break;

sleep(0.1)