Collaboration diagram for GPIO Interrupts:

Enumerations
enum	gpio_irq_mode_e { GPIO_IRQ_MODE_DISABLED, GPIO_IRQ_MODE_EDGE_FALLING, GPIO_IRQ_MODE_EDGE_RISING, GPIO_IRQ_MODE_EDGE_BOTH, GPIO_IRQ_MODE_LEVEL_LOW, GPIO_IRQ_MODE_LEVEL_HIGH }

Functions
status_e	gpio_irq_setup (const struct gpio_t gpio, uint32_t(handler)(const struct gpio_t *gpio), enum gpio_irq_mode_e mode, uint32_t prio)
	Setup interrupt on GPIO. More...

status_e	gpio_irq_disable (const struct gpio_t *gpio)
	Disable a gpio interrupt. More...

status_e	gpio_irq_restore (const struct gpio_t *gpio)
	Restore a gpio interrupt. More...

Detailed Description

Enumeration Type Documentation

enum gpio_irq_mode_e

Gpio IRQ modes

Enumerator
GPIO_IRQ_MODE_DISABLED	Disabled.
GPIO_IRQ_MODE_EDGE_FALLING	Falling edge.
GPIO_IRQ_MODE_EDGE_RISING	Rising edge.
GPIO_IRQ_MODE_EDGE_BOTH	Both edge.
GPIO_IRQ_MODE_LEVEL_LOW	Level low (emulated)
GPIO_IRQ_MODE_LEVEL_HIGH	Level high (emulated)

Definition at line 22 of file stm32_gpio_irq.h.

Function Documentation

status_e gpio_irq_setup	(	const struct gpio_t *	gpio,
		uint32_t()(const struct gpio_t gpio)	handler,
		enum gpio_irq_mode_e	mode,
		uint32_t	prio
	)

Setup interrupt on GPIO.

Parameters

gpio	the gpio to use (will be configured)
handler	handler's return value: see below
mode	gpio_irq_mode_e of the interrupt
prio	the priority for the NVIC

Returns: NO_ERROR for no problem

Warning: GPIO_IRQ_MODE_LEVEL_LOW and GPIO_IRQ_MODE_LEVEL_HIGH interrupts are emulated.

When using GPIO_IRQ_MODE_LEVEL_LOW and GPIO_IRQ_MODE_LEVEL_HIGH, the handler will be called continuously unless the pin level change to the inactive level. Deferred processing is possible, the handler can return true, and the loop will break. The deferred handler MUST call gpio_irq_restore() after the interrupt has been handled to restore normal behavior.

Definition at line 217 of file stm32_gpio_irq.c.

References ARRAY_SIZE, gpio_t::ctrl, ERROR_BAD_PARAM, ERROR_BAD_SWITCH, EXTI_InitTypeDef::EXTI_Line, EXTI_InitTypeDef::EXTI_LineCmd, EXTI_InitTypeDef::EXTI_Mode, EXTI_InitTypeDef::EXTI_Trigger, gpio_get(), GPIO_IRQ_MODE_DISABLED, GPIO_IRQ_MODE_EDGE_BOTH, GPIO_IRQ_MODE_EDGE_FALLING, GPIO_IRQ_MODE_EDGE_RISING, GPIO_IRQ_MODE_LEVEL_HIGH, GPIO_IRQ_MODE_LEVEL_LOW, gpio_setup(), NO_ERROR, gpio_t::nr, NVIC_InitTypeDef::NVIC_IRQChannel, NVIC_InitTypeDef::NVIC_IRQChannelCmd, NVIC_InitTypeDef::NVIC_IRQChannelPreemptionPriority, and NVIC_InitTypeDef::NVIC_IRQChannelSubPriority.