pin is the pin on which to enable the interrupt (can be a pin object or any valid pin name).
mode can be one of: - - trigger on a rising edge; - - trigger on a falling edge; - - trigger on a rising or falling edge.ExtInt.IRQ_RISINGExtInt.IRQ_FALLINGExtInt.IRQ_RISING_FALLING
pull can be one of: - - no pull up or down resistors; - - enable the pull-up resistor; - - enable the pull-down resistor.pyb.Pin.PULL_NONEpyb.Pin.PULL_UPpyb.Pin.PULL_DOWN
callback is the function to call when the interrupt triggers. The callback function must accept exactly 1 argument, which is the line that triggered the interrupt.
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