GPIO_INTPOL=falling
GPIO Interrupt Polarity Register. Each bit in this register controls the interrupt polarity setting for one GPIO pin in the associated port.
GPIO_INTPOL | Mask of all of the pins on the port. 0 (falling): Interrupts are latched on a falling edge or low level condition for this pin. 1 (rising): Interrupts are latched on a rising edge or high condition for this pin. |