#88 segmentation fult

[PeterC]

When I create a class and define a callback, it results in a segmentation fault:

class xx():
  def hwtrig(self,channel):
    pass

  def __init__(self):
    GPIO.setwarnings(False)
    GPIO.setmode(GPIO.BOARD)            ## Pin Numbers

    GPIO.PIN = 16
    GPIO.setup(GPIO.PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)   ## Pin 16 (GPIO.22)  
    GPIO.add_event_detect(GPIO.PIN, GPIO.FALLING, callback=self.hwtrig, bouncetime=100)

    GPIO.LCD = 7  #GPIO.4
    GPIO.setup(GPIO.LCD, GPIO.OUT)

    self.BL = GPIO.PWM(GPIO.LCD,2000)        ## PIN.7, GPIO.4 @ 2khz
    self.BL.start(99)

if I comment out the following line then the fault goes away:

GPIO.add_event_detect(GPIO.PIN, GPIO.FALLING, callback=self.hwtrig, bouncetime=100)