def main():
'''
Main program function
'''
# Create an instance of the IOPi class with an I2C address of 0x20
iobus = IOPi(0x20)
# Set all pins on the IO bus to be inputs with internal pull-ups enabled.
iobus.set_port_pullups(0, 0xFF)
iobus.set_port_pullups(1, 0xFF)
iobus.set_port_direction(0, 0xFF)
iobus.set_port_direction(1, 0xFF)
# invert the ports so pulling a pin to ground will show as 1 instead of 0
iobus.invert_port(0, 0xFF)
iobus.invert_port(1, 0xFF)
# Set the interrupt polarity to be active high and mirroring enabled, so
# pin 1 will trigger both INT A and INT B when a pin is grounded
iobus.set_interrupt_polarity(1)
iobus.mirror_interrupts(1)
# Set the interrupts default value to 0
iobus.set_interrupt_defaults(0, 0x00)
iobus.set_interrupt_defaults(1, 0x00)
# Set the interrupt type to be 1 for ports A and B so an interrupt is
# fired when a state change occurs
iobus.set_interrupt_type(0, 0x00)
iobus.set_interrupt_type(1, 0x00)
# Enable interrupts for pin 1
iobus.set_interrupt_on_port(0, 0x01)
iobus.set_interrupt_on_port(1, 0x00)
timer = threading.Thread(target=background_thread(iobus))
timer.daemon = True # set thread to daemon ('ok' won't be printed)
timer.start()
while 1:
"""
Do something in the main program loop while the interrupt checking
is carried out in the background
"""
# wait 1 seconds
time.sleep(1)
def main():
'''
Main program function
'''
# Create two instances of the IOPi class with
# I2C addresses of 0x20 and 0x21
busin = IOPi(0x20)
busout = IOPi(0x21)
# Set port 0 on the busin bus to be inputs with internal pull-ups enabled.
busin.set_port_pullups(0, 0xFF)
busin.set_port_direction(0, 0xFF)
# Invert the port so pins will show 1 when grounded
busin.invert_port(0, 0xFF)
# Set port 0 on busout to be outputs and set the port to be off
busout.set_port_direction(0, 0x00)
busout.write_port(0, 0x00)
# Set the interrupts default value for port 0 to 0x00 so the interrupt
# will trigger when any pin registers as true
busin.set_interrupt_defaults(0, 0x00)
# Set the interrupt type to be 1 on each pin for port 0 so an interrupt is
# fired when the pin matches the default value
busin.set_interrupt_type(0, 0xFF)
# Enable interrupts for all pins on port 0
busin.set_interrupt_on_port(0, 0xFF)
# Reset the interrupts
busin.reset_interrupts()
while True:
# read the interrupt status for each port.
if (busin.read_interrupt_status(0) != 0):
# If the status is not 0 then an interrupt has occured
# on one of the pins so read the value from the interrupt capture
value = busin.read_interrupt_capture(0)
# write the value to port 0 on the busout bus
busout.write_port(0, value)
# sleep 200ms before checking the pin again
time.sleep(0.2)
def main():
'''
Main program function
'''
# Create two instances of the IOPi class with
# I2C addresses of 0x20 and 0x21
ioin = IOPi(0x20)
ioout = IOPi(0x21)
# Set port 0 on the ioin bus to be inputs with internal pull-ups enabled.
ioin.set_port_pullups(0, 0xFF)
ioin.set_port_direction(0, 0xFF)
# Invert the port so pins will show 1 when grounded
ioin.invert_port(0, 0xFF)
# Set port 0 on ioout to be outputs and set the port to be off
ioout.set_port_direction(0, 0x00)
ioout.write_port(0, 0x00)
# Set the interrupts default value for port 0 to 0x00 so the interrupt
# will trigger when any pin registers as true
ioin.set_interrupt_defaults(0, 0x00)
# Set the interrupt type to be 1 on each pin for port 0 so an interrupt is
# fired when the pin matches the default value
ioin.set_interrupt_type(0, 0xFF)
# Enable interrupts for all pins on port 0
ioin.set_interrupt_on_port(0, 0xFF)
# Reset the interrupts
ioin.reset_interrupts()
while True:
# read the interrupt status for each port.
if (ioin.read_interrupt_status(0) != 0):
# If the status is not 0 then an interrupt has occured
# on one of the pins so read the value from the interrupt capture
value = ioin.read_interrupt_capture(0)
# write the value to port 0 on the ioout bus
ioout.write_port(0, value)
# sleep 200ms before checking the pin again
time.sleep(0.2)
def main():
'''
Main program function
'''
# Create an instance of the IOPi class with an I2C address of 0x20
iobus = IOPi(0x20)
# Set all pins on the IO bus to be inputs with internal pull-ups enabled.
iobus.set_port_pullups(0, 0xFF)
iobus.set_port_pullups(1, 0xFF)
iobus.set_port_direction(0, 0xFF)
iobus.set_port_direction(1, 0xFF)
# Invert both ports so pins will show 1 when grounded
iobus.invert_port(0, 0xFF)
iobus.invert_port(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
iobus.set_interrupt_polarity(1)
iobus.mirror_interrupts(0)
# Set the interrupts default value to 0x00 so the interrupt will trigger when any pin registers as true
iobus.set_interrupt_defaults(0, 0x00)
iobus.set_interrupt_defaults(1, 0x00)
# Set the interrupt type to be 1 for ports A and B so an interrupt is
# fired when the pin matches the default value
iobus.set_interrupt_type(0, 0xFF)
iobus.set_interrupt_type(1, 0xFF)
# Enable interrupts for all pins
iobus.set_interrupt_on_port(0, 0xFF)
iobus.set_interrupt_on_port(1, 0xFF)
while True:
# read the interrupt status for each port.
# If the status is not 0 then an interrupt has occured on one of the pins
# so read the value from the interrupt capture.
if (iobus.read_interrupt_status(0) != 0):
print("Port 0: " + str(iobus.read_interrupt_capture(0)))
if (iobus.read_interrupt_status(1) != 0):
print("Port 1: " + str(iobus.read_interrupt_capture(1)))
time.sleep(2)
def main():
"""
Main program function
"""
passed = True
iopi = IOPi(0x20, False) # new iopi object without initialisation
iopi.invert_bus(0x0000)
# Check invert_port port for low out of bounds
try:
iopi.invert_port(-1, 0)
pass
except ValueError:
print("port low boundary check: PASSED")
pass
except IOError:
passed = False
print("I2C IOError")
else:
passed = False
print("port low boundary check: FAILED")
pass
# Check invert_port port for high out of bounds
try:
iopi.invert_port(2, 0)
pass
except ValueError:
print("port high boundary check: PASSED")
pass
except IOError:
passed = False
print("I2C IOError")
else:
passed = False
print("port high boundary check: FAILED")
pass
# Check invert_port value for low out of bounds
try:
iopi.invert_port(0, -1)
pass
except ValueError:
print("value low boundary check: PASSED")
pass
except IOError:
passed = False
print("I2C IOError")
else:
passed = False
print("value low boundary check: FAILED")
pass
# Check invert_port value for high out of bounds
try:
iopi.invert_port(0, 256)
pass
except ValueError:
print("value high boundary check: PASSED")
pass
except IOError:
passed = False
print("I2C IOError")
else:
passed = False
print("value high boundary check: FAILED")
pass
# Logic Analyser Check
print("Logic output Started")
for x in range(0, 256):
iopi.invert_port(0, x)
iopi.invert_port(1, x)
print("Logic output Ended")
if passed is False:
print("Test Failed")
def main():
"""
Main program function
"""
global bus
# Create an instance of the IOPi class called bus and
# set the I2C address to be 0x20 or Bus 1.
bus = IOPi(0x20)
# Set port 0 on the bus to be inputs with internal pull-ups enabled.
bus.set_port_pullups(0, 0xFF)
bus.set_port_direction(0, 0xFF)
# Inverting the port will allow a button connected to ground to
# register as 1 or on.
bus.invert_port(0, 0xFF)
# Set the interrupt polarity to be active low so Int A and IntB go low
# when an interrupt is triggered and mirroring disabled, so
# Int A is mapped to port 0 and Int B is mapped to port 1
bus.set_interrupt_polarity(0)
bus.mirror_interrupts(0)
# Set the interrupts default value to 0 so it will trigger when any of
# the pins on the port 0 change to 1
bus.set_interrupt_defaults(0, 0x00)
# Set the interrupt type to be 0xFF so an interrupt is
# fired when the pin matches the default value
bus.set_interrupt_type(0, 0xFF)
# Enable interrupts for all pins on port 0
bus.set_interrupt_on_port(0, 0xFF)
# reset the interrups on the IO Pi bus
bus.reset_interrupts()
# set the Raspberry Pi GPIO mode to be BCM
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 23 the function
# button_pressed will be run
GPIO.add_event_detect(23, GPIO.FALLING, callback=button_pressed)
# print out a message and wait for keyboard input before
# exiting the program
input("press enter to exit ")