GPIO

gpio functions More...

Ameba Common
void	gpio_init (gpio_t *obj, PinName pin)
	Initializes the GPIO device, include mode/direction/pull control registers. More...
uint32_t	gpio_set (PinName pin)
	Set the given pin as GPIO. More...
void	gpio_mode (gpio_t *obj, PinMode mode)
	Set GPIO mode. More...
void	gpio_dir (gpio_t *obj, PinDirection direction)
	Set GPIO direction. More...
void	gpio_write (gpio_t *obj, int value)
	Sets value to the selected output port pin. More...
int	gpio_read (gpio_t *obj)
	Reads the specified gpio port pin. More...

Detailed Description

gpio functions

Function Documentation

void gpio_dir	(	gpio_t *	obj,
		PinDirection	direction
	)

Set GPIO direction.

Parameters

obj	gpio object define in application software.
direction	this parameter can be one of the following values: PIN_INPUT: this pin is input PIN_OUTPUT: this pin is output

Return values

none

void gpio_init	(	gpio_t *	obj,
		PinName	pin
	)

Initializes the GPIO device, include mode/direction/pull control registers.

Parameters

obj	gpio object define in application software.
pin	PinName according to pinmux spec.

Return values

none

void gpio_mode	(	gpio_t *	obj,
		PinMode	mode
	)

Set GPIO mode.

Parameters

obj	gpio object define in application software.
mode	this parameter can be one of the following values: PullNone: HighZ, user can input high or low use this pin OpenDrain(is OpenDrain output): no pull + OUT + GPIO[gpio_bit] = 0 PullDown: pull down PullUp: pull up

Return values

none

int gpio_read

(

gpio_t *

obj

)

Reads the specified gpio port pin.

Parameters

obj	gpio object define in application software.

Return values

1	pin state is high
0	pin state is low

uint32_t gpio_set

(

PinName

pin

)

Set the given pin as GPIO.

Parameters

pin	PinName according to pinmux spec.

Return values

The given pin with GPIO function

void gpio_write	(	gpio_t *	obj,
		int	value
	)

Sets value to the selected output port pin.

Parameters

obj	gpio object define in application software.
value	specifies the value to be written to the selected pin This parameter can be one of the following values: 0: Pin state set to low 1: Pin state set to high

Return values

none