How to use the external interrupt of pcDuino

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Key interrupt-poll mechanism

We try to make the keystroke have such a function that if no one presses the button within a certain period of time, the kernel alerts us, and then our application is reminded to print time out.

Driver program

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# define GPIO_IRQ 28

# define GPIO_TEST_BASE 0xf1c20800

# define PH_CFG2 (GPIO_TEST_BASE + 0x104)

# define PIO_INT_CFG2 (GPIO_TEST_BASE+ 0x208)

# define PIO_INT_CTL (GPIO_TEST_BASE+ 0x210)

# define PH17_SELECT (6