Legal Removal Request

Post: Hello The problem you are having is due to the GPIO event listener and your test function running within the same thread. The time.sleep() call is pausing the thread for 2 seconds during which the event listener can not respond to any button presses. What you will need to do is split your code into two threads with the gpio event listener in one thread and your other program code in a second thread. I have modified your program in the code below to show how you can use threads to make your program more responsive. [pre][code]import time from threading import Thread from threading import Event import RPi.GPIO as GPIO from IOPi import IOPi bus1 = None def button_pressed(interrupt_pin): global bus1 """ this function will be called when GPIO 23 falls low """ # read the interrupt capture for port 0 and store it in variable intval intval = bus1.read_interrupt_capture(0) # compare the value of intval with the IO Pi port 0 # using read_port(). wait until the port changes which will indicate # the button has been released. # without this while loop the function will keep repeating. while (intval == bus1.read_port(0)): time.sleep(0.2) # loop through each bit in the intval variable and check if the bit is 1 # which will indicate a button has been pressed for num in range(0, 8): if (intval & (1 << num)): # print("Pin " + str(num + 1) + " pressed") if str(num + 1) == '1': return state0() elif str(num + 1) == '2': return state1() elif str(num + 1) == '3': return state2() elif str(num + 1) == '4': return state3() def state0(): print("Pyano: Main Menu") bus1.write_pin(9, 1) bus1.write_pin(11, 0) bus1.write_pin(13, 0) bus1.write_pin(15, 0) def state1(): print("Mode 1: midi_player") bus1.write_pin(9, 0) bus1.write_pin(11, 1) bus1.write_pin(13, 0) bus1.write_pin(15, 0) def state2(): print("Mode 2: midi_maker") bus1.write_pin(9, 0) bus1.write_pin(11, 0) bus1.write_pin(13, 1) bus1.write_pin(15, 0) def state3(): print("Mode 3: midi_live") bus1.write_pin(9, 0) bus1.write_pin(11, 0) bus1.write_pin(13, 0) bus1.write_pin(15, 1) def test(): i = 0 while i < 100: print(i) e = Event() e.wait(timeout=2) i = i + 1 def gpio_thread(): # 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, bouncetime=300) def main(): """ Main program function """ global bus1 # Create an instance of the IOPi class called bus1 and # set the I2C address to be 0x20 or Bus 1. bus1 = IOPi(0x20) # State LED indicator setup bus1.set_port_direction(1, 0x00) bus1.write_port(1, 0x00) # Set port 0 on the bus1 to be inputs with internal pull-ups enabled. bus1.set_port_pullups(0, 0xFF) bus1.set_port_direction(0, 0xFF) # Inverting the port will allow a button connected to ground to # register as 1 or on. bus1.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 bus1.set_interrupt_polarity(0) bus1.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 bus1.set_interrupt_defaults(0, 0x00) # Set the interrupt type to be 0xFF so an interrupt is # fired when the pin matches the default value bus1.set_interrupt_type(0, 0xFF) # Enable interrupts for all pins on port 0 bus1.set_interrupt_on_port(0, 0xFF) # reset the interrups on the IO Pi bus1 bus1.reset_interrupts() #make sure all LEDs are turned off bus1.write_port(1, 0x00) thread1 = Thread(target=gpio_thread()) thread1.start() thread2 = Thread(target=test()) thread2.start() input("Press enter to exit program \n") if __name__ == "__main__": main()[/code][/pre]