GPIO

API for manipulating general-purpose input/output.

Defines

METAL_GPIO_INT_DISABLE
METAL_GPIO_INT_RISING
METAL_GPIO_INT_FALLING
METAL_GPIO_INT_BOTH_EDGE
METAL_GPIO_INT_LOW
METAL_GPIO_INT_HIGH
METAL_GPIO_INT_BOTH_LEVEL
METAL_GPIO_INT_MAX

Functions

struct metal_gpio *metal_gpio_get_device(unsigned int device_num)

Get a GPIO device handle.

Return

The GPIO device handle, or NULL if there is no device at that index

Parameters

  • device_num: The GPIO device index

__inline__ int metal_gpio_enable_input(struct metal_gpio *gpio, int pin)

enable input on a pin

Return

0 if the input is successfully enabled

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_disable_input(struct metal_gpio *gpio, int pin)

Disable input on a pin.

Return

0 if the input is successfully disabled

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_enable_output(struct metal_gpio *gpio, int pin)

Enable output on a pin.

Return

0 if the output is successfully enabled

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_disable_output(struct metal_gpio *gpio, int pin)

Disable output on a pin.

Return

0 if the output is successfully disabled

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_set_pin(struct metal_gpio *gpio, int pin, int value)

Set the output value of a GPIO pin.

Return

0 if the output is successfully set

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

  • value: The value to set the pin to

__inline__ int metal_gpio_get_input_pin(struct metal_gpio *gpio, int pin)

Get the value of the GPIO pin.

Return

The value of the GPIO pin

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_get_output_pin(struct metal_gpio *gpio, int pin)

Get the value of the GPIO pin.

Return

The value of the GPIO pin

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_clear_pin(struct metal_gpio *gpio, int pin)

Clears the value of the GPIO pin.

Return

0 if the pin is successfully cleared

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_toggle_pin(struct metal_gpio *gpio, int pin)

Toggles the value of the GPIO pin.

Return

0 if the pin is successfully toggled

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The pin number indexed from 0

__inline__ int metal_gpio_enable_pinmux(struct metal_gpio *gpio, int pin, int io_function)

Enables and sets the pinmux for a GPIO pin.

Return

0 if the pinmux is successfully set

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The bitmask for the pin to enable pinmux on

  • io_function: The IO function to set

__inline__ int metal_gpio_disable_pinmux(struct metal_gpio *gpio, int pin)

Disables the pinmux for a GPIO pin.

Return

0 if the pinmux is successfully set

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The bitmask for the pin to disable pinmux on

__inline__ int metal_gpio_config_interrupt(struct metal_gpio *gpio, int pin, int intr_type)

Config gpio interrupt type.

Return

0 if the interrupt mode is setup properly

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The bitmask for the pin to enable gpio interrupt

  • intr_type: The interrupt type

__inline__ int metal_gpio_clear_interrupt(struct metal_gpio *gpio, int pin, int intr_type)

Clear gpio interrupt status.

Return

0 if the interrupt is cleared

Parameters

  • gpio: The handle for the GPIO interface

  • pin: The bitmask for the pin to clear gpio interrupt

  • intr_type: The interrupt type to be clear

__inline__ struct metal_interrupt *metal_gpio_interrupt_controller(struct metal_gpio *gpio)

Get the interrupt controller for a gpio.

Return

A pointer to the interrupt controller responsible for handling gpio interrupts.

Parameters

  • gpio: The handle for the gpio

__inline__ int metal_gpio_get_interrupt_id(struct metal_gpio *gpio, int pin)

Get the interrupt id for a gpio.

Return

The interrupt id corresponding to a gpio.

Parameters

  • gpio: The handle for the gpio

  • pin: The bitmask for the pin to get gpio interrupt id

struct metal_gpio
#include <gpio.h>

The handle for a GPIO interface.