Applibs gpio.h

Article
08/08/2023

Header: #include <applibs/gpio.h>

The Applibs gpio header contains functions and types that interact with GPIOs.

Note

The following are listed and described in this section but are currently defined in the linux/gpio.h header file.

   Struct:
      gpiopin_request

    Enum:
      pin_config_param_type

    IOCTL:
      GPIO_SET_PIN_CONFIG_IOCTL

To use them in your application, be sure to add this line to your code:

#include <linux/gpio.h>

Application manifest requirements

To access individual GPIOs, your application must identify them in the Gpio field of the application manifest.

Thread safety

GPIO functions are thread-safe between calls to different GPIOs; however, it is the caller's responsibility to ensure thread safety for accesses to the same GPIO.

Hardware dependent IDs

Some GPIO functions reference identifiers that are hardware dependent. Hardware dependent IDs are constants that are defined in the hardware definition files for a device. For more information, see Manage target hardware dependencies.

Concepts and samples

Functions

Function	Description
GPIO_GetValue	Gets the current value of a GPIO.
GPIO_OpenAsInput	Opens a GPIO as an input.
GPIO_OpenAsOutput	Opens a GPIO as an output.
GPIO_SetValue	Sets the output value for an output GPIO.

Structs

Struct	Description
gpiopin_request	The drive strength configuration for one or more GPIO pins.

Enums

Enum	Description
GPIO_OutputMode	The options for the output mode of a GPIO.
GPIO_Value	The possible read/write values for a GPIO.
pin_config_param_type	The possible units for the current that drives a GPIO pin.

Typedefs

Typedef	Description
GPIO_Id	Specifies the type of a GPIO ID, which is used to specify a GPIO peripheral instance.
GPIO_OutputMode_Type	Specifies the type of the GPIO output mode.
GPIO_Value_Type	Specifies the type of a GPIO value.

I/O Controls (IOCTLs)

IOCTL	Description
GPIO_SET_PIN_CONFIG_IOCTL	Sets the drive strength of one or more GPIO pins, as specified in the gpiopin_request structure.

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