Overview

The MCUXpresso SDK provides 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_WritePinOutput() set output state of selected GPIO pin. The function GPIO_ReadPinInput() read input value of selected GPIO pin.

Port manipulation

The function GPIO_SetPinsOutput() sets the output level of selected GPIO pins to the logic 1. The function GPIO_ClearPinsOutput() sets the output level of selected GPIO pins to the logic 1. The function GPIO_TogglePinsOutput() reverse the output level of selected GPIO pins. The function GPIO_ReadPinsInput() read input value of selected port.

Port masking

The function GPIO_SetPortMask() set port mask, only pins masked by 0 will be enabled in following functions. The function GPIO_WriteMPort() sets the state of selected GPIO port, only pins masked by 0 will be affected. The function GPIO_ReadMPort() 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.

int main(void)
{
    uint32_t port_state = 0;
    /* Define the init structure for the output LED pin*/
    gpio_pin_config_t led_config = {
        kGPIO_DigitalOutput, 0,
    };
    /* Board pin, clock, debug console init */
    BOARD_InitHardware();
    /* Init output LED GPIO. */
    GPIO_PinInit(GPIO, BOARD_LED_GREEN_GPIO_PORT, BOARD_LED_GREEN_GPIO_PIN, &led_config);
    GPIO_WritePinOutput(GPIO, BOARD_LED_GREEN_GPIO_PORT, BOARD_LED_GREEN_GPIO_PIN, 1);
    GPIO_PinInit(GPIO, BOARD_LED_GPIO_PORT, BOARD_LED_GPIO_PIN, &led_config);
    GPIO_WritePinOutput(GPIO, BOARD_LED_GPIO_PORT, BOARD_LED_GPIO_PIN, 1);
    GPIO_PinInit(GPIO, BOARD_LED_BLUE_GPIO_PORT, BOARD_LED_BLUE_GPIO_PIN, &led_config);
    GPIO_WritePinOutput(GPIO, BOARD_LED_BLUE_GPIO_PORT, BOARD_LED_BLUE_GPIO_PIN, 1);
    GPIO_ClearPinsOutput(GPIO, 1, 1 << BOARD_LED_GREEN_GPIO_PIN | 1 << BOARD_LED_BLUE_GPIO_PIN);
    GPIO_SetPinsOutput(GPIO, 1, 1 << BOARD_LED_GREEN_GPIO_PIN | 1 << BOARD_LED_BLUE_GPIO_PIN);
    GPIO_ClearPinsOutput(GPIO, 1, 1 << BOARD_LED_BLUE_GPIO_PIN);
    GPIO_SetPinsOutput(GPIO, 1, 1 << BOARD_LED_BLUE_GPIO_PIN);
    GPIO_TogglePinsOutput(GPIO, 1, 1 << BOARD_LED_GREEN_GPIO_PIN | 1 << BOARD_LED_BLUE_GPIO_PIN);
    GPIO_TogglePinsOutput(GPIO, 1, 1 << BOARD_LED_GREEN_GPIO_PIN | 1 << BOARD_LED_BLUE_GPIO_PIN);
    GPIO_TogglePinsOutput(GPIO, 1, 1 << BOARD_LED_GREEN_GPIO_PIN);
    GPIO_TogglePinsOutput(GPIO, 1, 1 << BOARD_LED_GREEN_GPIO_PIN);
    GPIO_TogglePinsOutput(GPIO, BOARD_LED_GPIO_PORT, 1 << BOARD_LED_GPIO_PIN);
    GPIO_TogglePinsOutput(GPIO, BOARD_LED_GPIO_PORT, 1 << BOARD_LED_GPIO_PIN);
    /* Port masking */
    GPIO_SetPortMask(GPIO, BOARD_LED_GPIO_PORT, 0x0000ffff);
    GPIO_WriteMPort(GPIO, BOARD_LED_GPIO_PORT, 0xffffffff);
    port_state = GPIO_ReadPinsInput(GPIO, 0);
    port_state = GPIO_ReadMPort(GPIO, 0);
    while (1)
    {
        port_state = GPIO_ReadPinsInput(GPIO, 0);
        if (!(port_state & (1 << BOARD_SW1_GPIO_PIN)))
        {
            GPIO_TogglePinsOutput(GPIO, BOARD_LED_GPIO_PORT, 1u << BOARD_LED_GPIO_PIN);
        }
        if (!GPIO_ReadPinInput(GPIO, BOARD_SW2_GPIO_PORT, BOARD_SW2_GPIO_PIN))
        {
            GPIO_TogglePinsOutput(GPIO, BOARD_LED_GREEN_GPIO_PORT, 1u << BOARD_LED_GREEN_GPIO_PIN);
        }
        delay();
    }
}

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_SetPinsOutput (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_ClearPinsOutput (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_TogglePinsOutput (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, 0, 0))
	LPC GPIO driver version 2.0.0. More...

GPIO Configuration
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_WritePinOutput (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_ReadPinInput (GPIO_Type *base, uint32_t port, uint32_t pin)
	Reads the current input value of the GPIO PIN. More...

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, 0, 0))

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_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_WritePinOutput	(	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_ReadPinInput	(	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_SetPinsOutput	(	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_ClearPinsOutput	(	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_TogglePinsOutput	(	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

Overview

Function groups

Initialization and deinitialization

Pin manipulation

Port manipulation

Port masking

Typical use case

Files

Data Structures

Enumerations

Functions

Driver version

GPIO Configuration

GPIO Output Operations

GPIO Input Operations

Data Structure Documentation

Data Fields

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation