GPIO Interface driver

GPIO Interrupt Setting
GPIO interrupt level and edge trigger types
int	board_gpio_config (uint32_t pin, int mode, bool input, bool drive, int pull)
int	board_gpio_status (uint32_t pin, bool *input, bool *output, bool *drive, int *pull)
void	board_gpio_write (uint32_t pin, int value)
int	board_gpio_read (uint32_t pin)
int	board_gpio_intconfig (uint32_t pin, int mode, bool filter, xcpt_t isr)
int	board_gpio_intstatus (uint32_t pin, int *mode, bool *filter, bool *enabled)
int	board_gpio_int (uint32_t pin, bool enable)
#define	INT_HIGH_LEVEL   (2) /* High Level */
#define	INT_LOW_LEVEL   (3) /* Low Level */
#define	INT_RISING_EDGE   (4) /* Rising Edge */
#define	INT_FALLING_EDGE   (5) /* Falling Edge */
#define	INT_BOTH_EDGE   (7) /* Both Edge */

Pin Pull Setting
Pin floating, pull up, pull down definitions
#define	PIN_FLOAT   (0) /* Floating */
#define	PIN_PULLUP   (1) /* Internal Weak Pull Up */
#define	PIN_PULLDOWN   (2) /* Internal Weak Pull Down */
#define	PIN_BUSKEEPER   (3) /* Internal Bus-Keeper */

Detailed Description

Function Documentation

board_gpio_config()

int board_gpio_config	(	uint32_t	pin,
		int	mode,
		bool	input,
		bool	drive,
		int	pull
	)

GPIO Configure

Parameters

[in]	pin	Pin number
[in]	mode	Function mode 0=GPIO
[in]	input	Input Enable true=enable, false=disable
[in]	drive	Drive Strength true=High Drive(4mA), false=Normal(2mA)
[in]	pull	0=float, 1=pullup, 2=pulldown, 3=buskeeper #PIN_FLOAT #PIN_PULLUP #PIN_PULLDOWN #PIN_BUSKEEPER

Returns

OK(0) is success. negative value is failure.

board_gpio_status()

int board_gpio_status	(	uint32_t	pin,
		bool *	input,
		bool *	output,
		bool *	drive,
		int *	pull
	)

GPIO Status

Parameters

[in]	pin	Pin number
[out]	input	Input Enable true=enable, false=disable
[out]	output	Output Enable true=enable, false=disable
[out]	drive	Drive Strength true=HighDrive(4mA), false=Normal(2mA)
[out]	pull	0=float, 1=pullup, 2=pulldown, 3=buskeeper #PIN_FLOAT #PIN_PULLUP #PIN_PULLDOWN #PIN_BUSKEEPER

Returns

Pin function mode. negative value is failure.

board_gpio_write()

void board_gpio_write	(	uint32_t	pin,
		int	value
	)

GPIO Write

Parameters

[in]	pin	Pin number
[in]	value	Write Value 0<high, 0=low, 0>hiz

board_gpio_read()

int board_gpio_read

(

uint32_t

pin

)

GPIO Read

Parameters

[in]

pin

Pin number

Returns

read value 1=high, 0=low

board_gpio_intconfig()

int board_gpio_intconfig	(	uint32_t	pin,
		int	mode,
		bool	filter,
		xcpt_t	isr
	)

GPIO Interrupt Configure

Parameters

[in]	pin	Pin number
[in]	mode	Interrupt polarity #INT_HIGH_LEVEL #INT_LOW_LEVEL #INT_RISING_EDGE #INT_FALLING_EDGE #INT_BOTH_EDGE
[in]	filter	Noise Filter true=enable, false=disable
[in]	isr	Interrupt Service Routine

Returns

IRQ number. negative value is failure.

board_gpio_intstatus()

int board_gpio_intstatus	(	uint32_t	pin,
		int *	mode,
		bool *	filter,
		bool *	enabled
	)

GPIO Interrupt Configure

Parameters

[in]	pin	Pin number
[out]	mode	Interrupt polarity #INT_HIGH_LEVEL #INT_LOW_LEVEL #INT_RISING_EDGE #INT_FALLING_EDGE #INT_BOTH_EDGE
[out]	filter	Noise Filter true=enable, false=disable
[out]	enabled	Interrupt true=enable, false=disable

Returns

IRQ number. negative value is failure.

board_gpio_int()

int board_gpio_int	(	uint32_t	pin,
		bool	enable
	)

GPIO Interrupt Enable/Disable

Parameters

[in]	pin	Pin number
[in]	enable	Interrupt true=enable, false=disable

Returns

IRQ number. negative value is failure.