GPIO: General Purpose I/O

Overview

The MCUXpresso SDK provides a peripheral driver for the General Purpose I/O (GPIO) module of MCUXpresso SDK devices.

Function groups

Initialization and deinitialization

The function GPIO_PinInit() initializes the GPIO with specified configuration.

Pin manipulation

The function GPIO_PinWrite() set output state of selected GPIO pin. The function GPIO_PinRead() read input value of selected GPIO pin.

Port manipulation

The function GPIO_PortSet() sets the output level of selected GPIO pins to the logic 1. The function GPIO_PortClear() sets the output level of selected GPIO pins to the logic 0. The function GPIO_PortToggle() reverse the output level of selected GPIO pins. The function GPIO_PortRead() read input value of selected port.

Port masking

The function GPIO_PortMaskedSet() set port mask, only pins masked by 0 will be enabled in following functions. The function GPIO_PortMaskedWrite() sets the state of selected GPIO port, only pins masked by 0 will be affected. The function GPIO_PortMaskedRead() reads the state of selected GPIO port, only pins masked by 0 are enabled for read, pins masked by 1 are read as 0.

Typical use case

Example use of GPIO API. Refer to the driver examples codes located at <SDK_ROOT>/boards/<BOARD>/driver_examples/gpio

Files
file	fsl_gpio.h

Data Structures
struct	gpio_pin_config_t
	The GPIO pin configuration structure. More...

Enumerations
enum	gpio_pin_direction_t {   kGPIO_DigitalInput = 0U,   kGPIO_DigitalOutput = 1U }
	LPC GPIO direction definition. More...

Functions
static void	GPIO_PortSet (GPIO_Type *base, uint32_t port, uint32_t mask)
	Sets the output level of the multiple GPIO pins to the logic 1. More...
static void	GPIO_PortClear (GPIO_Type *base, uint32_t port, uint32_t mask)
	Sets the output level of the multiple GPIO pins to the logic 0. More...
static void	GPIO_PortToggle (GPIO_Type *base, uint32_t port, uint32_t mask)
	Reverses current output logic of the multiple GPIO pins. More...

Driver version
#define	FSL_GPIO_DRIVER_VERSION   (MAKE_VERSION(2, 1, 7))
	LPC GPIO driver version. More...

GPIO Configuration
void	GPIO_PortInit (GPIO_Type *base, uint32_t port)
	Initializes the GPIO peripheral. More...
void	GPIO_PinInit (GPIO_Type *base, uint32_t port, uint32_t pin, const gpio_pin_config_t *config)
	Initializes a GPIO pin used by the board. More...

GPIO Output Operations
static void	GPIO_PinWrite (GPIO_Type *base, uint32_t port, uint32_t pin, uint8_t output)
	Sets the output level of the one GPIO pin to the logic 1 or 0. More...

GPIO Input Operations
static uint32_t	GPIO_PinRead (GPIO_Type *base, uint32_t port, uint32_t pin)
	Reads the current input value of the GPIO PIN. More...

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Data Structure Documentation

struct gpio_pin_config_t

Every pin can only be configured as either output pin or input pin at a time. If configured as a input pin, then leave the outputConfig unused.

Data Fields
gpio_pin_direction_t	pinDirection
	GPIO direction, input or output.
uint8_t	outputLogic
	Set default output logic, no use in input.

Macro Definition Documentation

#define FSL_GPIO_DRIVER_VERSION   (MAKE_VERSION(2, 1, 7))

Enumeration Type Documentation

enum gpio_pin_direction_t

Enumerator
kGPIO_DigitalInput	Set current pin as digital input.
kGPIO_DigitalOutput	Set current pin as digital output.

Function Documentation

void GPIO_PortInit	(	GPIO_Type *	base,
		uint32_t	port
	)

This function ungates the GPIO clock.

Parameters

base	GPIO peripheral base pointer.
port	GPIO port number.

void GPIO_PinInit	(	GPIO_Type *	base,
		uint32_t	port,
		uint32_t	pin,
		const gpio_pin_config_t *	config
	)

To initialize the GPIO, define a pin configuration, either input or output, in the user file. Then, call the GPIO_PinInit() function.

This is an example to define an input pin or output pin configuration:

* Define a digital input pin configuration,
* gpio_pin_config_t config =
* {
*   kGPIO_DigitalInput,
*   0,
* }
* Define a digital output pin configuration,
* gpio_pin_config_t config =
* {
*   kGPIO_DigitalOutput,
*   0,
* }
* 

Parameters

base	GPIO peripheral base pointer(Typically GPIO)
port	GPIO port number
pin	GPIO pin number
config	GPIO pin configuration pointer

static void GPIO_PinWrite ( GPIO_Type *  base, uint32_t  port, uint32_t  pin, uint8_t  output  )

inlinestatic

Parameters

base	GPIO peripheral base pointer(Typically GPIO)
port	GPIO port number
pin	GPIO pin number
output	GPIO pin output logic level. 0: corresponding pin output low-logic level. 1: corresponding pin output high-logic level.

static uint32_t GPIO_PinRead ( GPIO_Type *  base, uint32_t  port, uint32_t  pin  )

inlinestatic

Parameters

base	GPIO peripheral base pointer(Typically GPIO)
port	GPIO port number
pin	GPIO pin number

Return values

GPIO	port input value 0: corresponding pin input low-logic level. 1: corresponding pin input high-logic level.

static void GPIO_PortSet ( GPIO_Type *  base, uint32_t  port, uint32_t  mask  )

inlinestatic

Parameters

base	GPIO peripheral base pointer(Typically GPIO)
port	GPIO port number
mask	GPIO pin number macro

static void GPIO_PortClear ( GPIO_Type *  base, uint32_t  port, uint32_t  mask  )

inlinestatic

Parameters

base	GPIO peripheral base pointer(Typically GPIO)
port	GPIO port number
mask	GPIO pin number macro

static void GPIO_PortToggle ( GPIO_Type *  base, uint32_t  port, uint32_t  mask  )

inlinestatic

Parameters

base	GPIO peripheral base pointer(Typically GPIO)
port	GPIO port number
mask	GPIO pin number macro