"""Callback function for EINT0.
"""
while not digitalRead(BTN):
sleep(0)
print "%s don't touch that!" % choice(responses)
state = digitalRead(LED)
digitalWrite(LED, state ^ 1)
EXTI_ClearEXTIFlag(0)
# control the LED manually
heartbeatOff()
pinMode(LED, OUTPUT)
# setup EINT0 on pin 2.10
PinCfg = PINSEL_CFG_Type()
PinCfg.Funcnum = 1
PinCfg.OpenDrain = 0
PinCfg.Pinmode = 0
PinCfg.Pinnum = 10
PinCfg.Portnum = 2
PINSEL_ConfigPin(PinCfg.ptr)
EXTI_Init()
# register the callback
registerCallback(IRQn_Type.EINT0_IRQn, EINT0Callback)
# enable EINT0
NVIC_EnableIRQ(IRQn_Type.EINT0_IRQn)
# the callback does everything from here
