def Init_IOPi():
global sensorbus
global buttonbus
i2c_helper = ABEHelpers()
i2c_bus = i2c_helper.get_smbus()
sensorbus = IoPi(i2c_bus, 0x20)
# set both rows of pins to input mode
sensorbus.set_port_direction(0, 0xFF)
sensorbus.set_port_direction(1, 0xFF)
#setup interrupts on bus 2, port 1
buttonbus = IoPi(i2c_bus, 0x21)
# Set all pins on the bus to be inputs with internal pull-ups enabled.
buttonbus.set_port_pullups(1, 0xFF)
buttonbus.set_port_direction(1, 0xFF)
# Inverting the ports will allow a button connected to ground to register as 1 or on.
buttonbus.invert_port(1, 0xFF) # invert port 1 so a button press will register as 1
# Set the interrupt polarity to be active low and mirroring enabled, so
# INT A and INT B go low when an interrupt is triggered
buttonbus.set_interrupt_polarity(0)
#buttonbus.mirror_interrupts(1)
# Set the interrupts default value to 0 so it will trigger when any of the pins on the bus change to 1
buttonbus.set_interrupt_defaults(1, 0x00)
# Set the interrupt type to be 0xFF for port B so an interrupt is
# fired when the pin matches the default value
buttonbus.set_interrupt_type(1, 0xFF)
# Enable interrupts for all pins on the port
buttonbus.set_interrupt_on_port(1, 0xFF)
# reset the interrups on the IO Pi bus
buttonbus.reset_interrupts()
GPIO.setmode(GPIO.BCM)
# Set up GPIO 23 as an input. The pull-up resistor is disabled as the level shifter will act as a pull-up.
GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_OFF)
# when a falling edge is detected on GPIO pin 23 the function button_pressed will be run
GPIO.add_event_detect(23, GPIO.FALLING, callback=hwbutton_pressed)
Initialise the IOPi device using the default addresses, you will need to
change the addresses if you have changed the jumpers on the IO Pi
"""
i2c_helper = ABEHelpers()
i2c_bus = i2c_helper.get_smbus()
# create two instances of the IoPi class called bus1 and bus2 and set the default i2c addresses
bus1 = IoPi(i2c_bus, 0x20) # bus 1 will be inputs
bus2 = IoPi(i2c_bus, 0x21) # bus 2 will be outputs
# Each bus is divided up two 8 bit ports. Port 0 controls pins 1 to 8, Port 1 controls pins 9 to 16.
# We will read the inputs on pin 1 of bus 1 so set port 0 to be inputs and
# enable the internal pull-up resistors
bus1.set_port_direction(0, 0xFF)
bus1.set_port_pullups(0, 0xFF)
# We will write to the output pin 1 on bus 2 so set port 0 to be outputs and
# turn off the pins on port 0
bus2.set_port_direction(0, 0x00)
bus2.write_port(0, 0x00)
while True:
# read pin 1 on bus 1. If pin 1 is high set the output on bus 2 pin 1 to high, otherwise set it to low.
# connect pin 1 on bus 1 to ground to see the output on bus 2 pin 1 change state.
if (bus1.read_pin(1) == 1):
bus2.write_pin(1, 1)
""" from ABE_helpers import ABEHelpers from ABE_IoPi import IoPi import time i2c_helper = ABEHelpers() newbus = i2c_helper.get_smbus() bus1 = IoPi(newbus, 0x20) bus2 = IoPi(newbus, 0x21) # Set all pins on bus 2 to be inputs with internal pull-ups disabled. bus2.set_port_pullups(0, 0x00) bus2.set_port_pullups(1, 0x00) bus2.set_port_direction(0, 0xFF) bus2.set_port_direction(1, 0xFF) # Set the interrupt polarity to be active high and mirroring disabled, so # pins 1 to 8 trigger INT A and pins 9 to 16 trigger INT B bus2.set_interrupt_polarity(1) bus2.mirror_interrupts(0) # Set the interrupts default value to trigger when 5V is applied to pins 1 # and 16 bus2.set_interrupt_defaults(0, 0x01) bus2.set_interrupt_defaults(0, 0x80) # Set the interrupt type to be 1 for ports A and B so an interrupt is # fired when the pin matches the default value bus2.set_interrupt_type(0, 1)
This example reads the first 8 pins of bus 1 on the IO Pi board. The
internal pull-up resistors are enabled so each pin will read as 1 unless
the pin is connected to ground.
Initialise the IOPi device using the default addresses, you will need to
change the addresses if you have changed the jumpers on the IO Pi
"""
i2c_helper = ABEHelpers()
i2c_bus = i2c_helper.get_smbus()
bus = IoPi(i2c_bus, 0x20)
# We will read the inputs 1 to 8 from bus 2 so set port 0 to be inputs and
# enable the internal pull-up resistors
bus.set_port_direction(0, 0xFF)
bus.set_port_pullups(0, 0xFF)
while True:
# clear the console
os.system("clear")
# read the pins 1 to 8 and print the results
print "Pin 1: " + str(bus.read_pin(1))
print "Pin 2: " + str(bus.read_pin(2))
print "Pin 3: " + str(bus.read_pin(3))
print "Pin 4: " + str(bus.read_pin(4))
print "Pin 5: " + str(bus.read_pin(5))
print "Pin 6: " + str(bus.read_pin(6))
print "Pin 7: " + str(bus.read_pin(7))
print "Pin 8: " + str(bus.read_pin(8))
# ledbus.set_pin_direction(8, 0) # set pin 8 as an ou tput
# ledbus.write_pin(8, 0) # turn off pin 8
# print "turn off pin 8"
# sensorbus.set_pin_pullup(1, 1) # enable the internal pull-up resistor on pin 1
# sensorbus.invert_pin(1, 1) # invert pin 1 so a button press will register as 1
# sensorbus.set_port_direction(0, 0xFF)
# sensorbus.set_port_pullups(0, 0xFF)
# sensorbus.invert_port(0, 0xFF)
sensorbus.set_port_direction(1, 0xFF)
sensorbus.set_port_pullups(1, 0xFF)
sensorbus.invert_port(1, 0xFF)
print "start"
vold = 99
while True:
v = sensorbus.read_port(1)
# print v
if v != vold:
print v
# print "CCC"
vold = v
time.sleep(0.1)
# if sensorbus.read_pin(1) == 1: # check to see if the button is pressed
# print 'button pressed' # print a message to the screen
"""
================================================
ABElectronics IO Pi 32-Channel Port Expander - Tutorial 1a
Version 1.1 Created 10/05/2014
Version 1.1 16/11/2014 updated code and functions to PEP8 format
Requires python smbus to be installed: sudo apt-get install python-smbus
run with: sudo python tutorial1a.py
================================================
This example uses the write_port method to count in binary using 8 LEDs
"""
from ABE_helpers import ABEHelpers
from ABE_IoPi import IoPi
import time
i2c_helper = ABEHelpers()
i2c_bus = i2c_helper.get_smbus()
bus = IoPi(i2c_bus, 0x20)
bus.set_port_direction(0, 0x00)
bus.write_port(0, 0x00)
while True:
for x in range(0, 255):
bus.write_port(0, x)
time.sleep(0.5)
bus.write_port(0, 0x00)
class App:
global i2c_helper
global newbus
global bus2
def __init__(self, master):
self.i2c_helper = ABEHelpers()
self.newbus = self.i2c_helper.get_smbus()
self.bus2 = IoPi(
self.newbus, 0x21
) # create an instance of Bus 2 which is on I2C address 0x21 by default
self.bus2.set_port_direction(
0, 0x00) # set pins 1 to 8 to be outputs and turn them off
self.bus2.write_port(0, 0x00)
self.bus2.set_port_direction(
1, 0x00) # set pins 9 to 16 to be outputs and turn them off
self.bus2.write_port(1, 0x00)
frame = Frame(master) # create a frame for the GUI
frame.pack()
# create 16 buttons which run the togglepin function when pressed
self.button = Button(frame,
text="Pin 1",
command=lambda: self.togglepin(1))
self.button.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 2",
command=lambda: self.togglepin(2))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 3",
command=lambda: self.togglepin(3))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 4",
command=lambda: self.togglepin(4))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 5",
command=lambda: self.togglepin(5))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 6",
command=lambda: self.togglepin(6))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 7",
command=lambda: self.togglepin(7))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 8",
command=lambda: self.togglepin(8))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 9",
command=lambda: self.togglepin(9))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 10",
command=lambda: self.togglepin(10))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 11",
command=lambda: self.togglepin(11))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 12",
command=lambda: self.togglepin(12))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 13",
command=lambda: self.togglepin(13))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 14",
command=lambda: self.togglepin(14))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 15",
command=lambda: self.togglepin(15))
self.slogan.pack(side=LEFT)
self.slogan = Button(frame,
text="Pin 16",
command=lambda: self.togglepin(16))
self.slogan.pack(side=LEFT)
def togglepin(self, pin):
# read the status from the selected pin, invert it and write it back to the pin
pinstatus = self.bus2.read_pin(pin)
if (pinstatus == 1):
pinstatus = 0
else:
pinstatus = 1
self.bus2.write_pin(pin, pinstatus)
on and off on the IO Pi.
Initialise the IOPi device using the default addresses, you will need to
change the addresses if you have changed the jumpers on the IO Pi
"""
from ABE_helpers import ABEHelpers
from ABE_IoPi import IoPi
import time
i2c_helper = ABEHelpers()
newbus = i2c_helper.get_smbus()
bus1 = IoPi(newbus, 0x20)
# We will write to the pins 9 to 16 from bus 1 so set port 1 to be outputs
# turn off the pins
bus1.set_port_direction(1, 0x00)
bus1.write_port(1, 0x00)
while True:
# count to 255 and display the value on pins 9 to 16 in binary format
for x in range(0, 255):
time.sleep(0.05)
bus1.write_port(1, x)
# turn off all of the pins on bank 1
bus1.writePort(1, 0x00)
# now turn on all of the leds in turn by writing to one pin at a time
bus1.write_pin(9, 1)
time.sleep(0.1)
