gpio.c File Reference

GPIO Driver. More...

#include <rtems/rtems/status.h>
#include <stdint.h>
#include <bsp/rpi-gpio.h>
#include <bsp/raspberrypi.h>

Macros
#define	BSP_GPIO_BASE   BCM2711_GPIO_BASE
#define	BSP_GPIO_SIZE   BCM2711_GPIO_SIZE
#define	BSP_GPIO_PIN_COUNT   BCM2711_GPIO_PIN_COUNT
#define	GPFSEL0   BCM2835_REG(BSP_GPIO_BASE + 0x00)
#define	GPSET0   BCM2835_REG(BSP_GPIO_BASE + 0x1c)
#define	GPCLR0   BCM2835_REG(BSP_GPIO_BASE + 0x28)
#define	GPIO_PUP_PDN_CTRL_REG0   BCM2835_REG(BSP_GPIO_BASE + 0xe4)
#define	FSELn_SIZE   3
#define	CLRn_SIZE   1
#define	SETn_SIZE   1
#define	REG_SET   1

Functions
rtems_status_code	raspberrypi_gpio_set_function (const unsigned int pin, const raspberrypi_gpio_function value)
	Set the operation of the general-purpose I/O pins. Each of the 58 GPIO pins has at least two alternative functions as defined.
rtems_status_code	raspberrypi_gpio_clear_pin (const unsigned int pin)
	Clear a GPIO pin.
rtems_status_code	raspberrypi_gpio_set_pin (const unsigned int pin)
	Set a GPIO pin.
rtems_status_code	raspberrypi_gpio_set_pull (const unsigned int pin, const raspberrypi_gpio_pull value)
	Control the actuation of the internal pull-up/down resistors.

Detailed Description

GPIO Driver.

Function Documentation

raspberrypi_gpio_clear_pin()

rtems_status_code raspberrypi_gpio_clear_pin

(

const unsigned int

pin

)

Clear a GPIO pin.

Parameters

pin	The GPIO pin.

Return values

RTEMS_SUCCESSFUL	GPIO pin clear successfully.
RTEMS_INVALID_NUMBER	This status code indicates that a specified number was invalid.

raspberrypi_gpio_set_function()

rtems_status_code raspberrypi_gpio_set_function	(	const unsigned int	pin,
		const raspberrypi_gpio_function	value
	)

Set the operation of the general-purpose I/O pins. Each of the 58 GPIO pins has at least two alternative functions as defined.

Parameters

pin	The GPIO pin.
value	The optional functions are GPIO_INPUT, GPIO_OUTPUT, GPIO_AF5, GPIO_AF4, GPIO_AF0, GPIO_AF1, GPIO_AF2, GPIO_AF3.

Return values

RTEMS_SUCCESSFUL	GPIO function successfully configured.
RTEMS_INVALID_NUMBER	This status code indicates that a specified number was invalid.

raspberrypi_gpio_set_pin()

rtems_status_code raspberrypi_gpio_set_pin

(

const unsigned int

pin

)

Set a GPIO pin.

Parameters

pin	The GPIO pin.

Return values

RTEMS_SUCCESSFUL	GPIO pin set successfully.
RTEMS_INVALID_NUMBER	This status code indicates that a specified number was invalid.

raspberrypi_gpio_set_pull()

rtems_status_code raspberrypi_gpio_set_pull	(	const unsigned int	pin,
		const raspberrypi_gpio_pull	value
	)

Control the actuation of the internal pull-up/down resistors.

Parameters

pin	The GPIO pin.
value	The optional value are GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN.

Return values

RTEMS_SUCCESSFUL	GPIO pull set successfully.
RTEMS_INVALID_NUMBER	This status code indicates that a specified number was invalid.