# ================================================ # This example shows how to use the interrupt methods on the Expander Pi IO port. # The interrupts will be enabled and set so that a voltage applied to pins 1 and 16 will trigger INT A and B respectively. # using the read_interrupt_capture or read_port methods will reset the # interrupts. # Initialise the IOPi and create an instance called io. """ io = IO() # Set all pins on the IO bus to be inputs with internal pull-ups disabled. io.set_port_pullups(0, 0x00) io.set_port_pullups(1, 0x00) io.set_port_direction(0, 0xFF) io.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 io.set_interrupt_polarity(1) io.mirror_interrupts(0) # Set the interrupts default value to trigger when 5V is applied to pins 1 # and 16 io.set_interrupt_defaults(0, 0x01) io.set_interrupt_defaults(0, 0x80) # Set the interrupt type to be 1 for ports A and B so an interrupt is
run with: sudo python3 demo-ioread.py
================================================
This example reads the first 8 pins of on the Expander Pi Digital I/O
port. The internal pull-up resistors are enabled so each pin will read
as 1 unless the pin is connected to ground.
Initialise the IO class and create an instance called io.
"""
io = IO()
# We will read the inputs 1 to 16 from the I/O bus so set port 0 and port 1 to be
# inputs and enable the internal pull-up resistors
io.set_port_direction(0, 0xFF)
io.set_port_pullups(0, 0xFF)
io.set_port_direction(1, 0xFF)
io.set_port_pullups(1, 0xFF)
while True:
# clear the console
os.system('clear')
# read the pins 1 to 16 and print the results
print ('Pin 1: ' + str(io.read_pin(1)))
print ('Pin 2: ' + str(io.read_pin(2)))
print ('Pin 3: ' + str(io.read_pin(3)))
print ('Pin 4: ' + str(io.read_pin(4)))
print ('Pin 5: ' + str(io.read_pin(5)))
print ('Pin 6: ' + str(io.read_pin(6)))
# check the value of intA to see if an interrupt has occurred
if (intA != 0):
callback_function()
# sleep this thread for 0.5 seconds
time.sleep(0.5)
i2c_helper = ABEHelpers()
bus = i2c_helper.get_smbus()
io = IO(bus)
# Set all pins on the IO bus to be inputs with internal pull-ups enabled.
io.set_port_pullups(0, 0xFF)
io.set_port_pullups(1, 0xFF)
io.set_port_direction(0, 0xFF)
io.set_port_direction(1, 0xFF)
# invert the ports so pulling a pin to ground will show as 1 instead of 0
io.invert_port(0, 0xFF)
io.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
io.set_interrupt_polarity(1)
io.mirror_interrupts(1)
# Set the interrupts default value to 0
io.set_interrupt_defaults(0, 0x00)
# ================================================ # This example shows how to use the interrupt methods on the Expander Pi IO port. # The interrupts will be enabled and set so that a voltage applied to pins 1 and 16 will trigger INT A and B respectively. # using the read_interrupt_capture or read_port methods will reset the # interrupts. # Initialise the IOPi and create an instance called io. """ io = IO() # Set all pins on the IO bus to be inputs with internal pull-ups disabled. io.set_port_pullups(0, 0x00) io.set_port_pullups(1, 0x00) io.set_port_direction(0, 0xFF) io.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 io.set_interrupt_polarity(1) io.mirror_interrupts(0) # Set the interrupts default value to trigger when 5V is applied to pins 1 # and 16 io.set_interrupt_defaults(0, 0x01) io.set_interrupt_defaults(0, 0x80) # Set the interrupt type to be 1 for ports A and B so an interrupt is
