LED Interface

LED Interface. More...

Data Structures
struct	led_info
	LED information structure. More...
struct	led_driver_api
	LED driver API. More...

Typedefs
typedef int(*	led_api_blink) (const struct device *dev, uint32_t led, uint32_t delay_on, uint32_t delay_off)
	Callback API for blinking an LED.
typedef int(*	led_api_get_info) (const struct device *dev, uint32_t led, const struct led_info **info)
	Optional API callback to get LED information.
typedef int(*	led_api_set_brightness) (const struct device *dev, uint32_t led, uint8_t value)
	Callback API for setting brightness of an LED.
typedef int(*	led_api_set_color) (const struct device *dev, uint32_t led, uint8_t num_colors, const uint8_t *color)
	Optional API callback to set the colors of a LED.
typedef int(*	led_api_on) (const struct device *dev, uint32_t led)
	Callback API for turning on an LED.
typedef int(*	led_api_off) (const struct device *dev, uint32_t led)
	Callback API for turning off an LED.
typedef int(*	led_api_write_channels) (const struct device *dev, uint32_t start_channel, uint32_t num_channels, const uint8_t *buf)
	Callback API for writing a strip of LED channels.

Functions
int	led_blink (const struct device *dev, uint32_t led, uint32_t delay_on, uint32_t delay_off)
	Blink an LED.
int	led_get_info (const struct device *dev, uint32_t led, const struct led_info **info)
	Get LED information.
int	led_set_brightness (const struct device *dev, uint32_t led, uint8_t value)
	Set LED brightness.
int	led_write_channels (const struct device *dev, uint32_t start_channel, uint32_t num_channels, const uint8_t *buf)
	Write/update a strip of LED channels.
int	led_set_channel (const struct device *dev, uint32_t channel, uint8_t value)
	Set a single LED channel.
int	led_set_color (const struct device *dev, uint32_t led, uint8_t num_colors, const uint8_t *color)
	Set LED color.
int	led_on (const struct device *dev, uint32_t led)
	Turn on an LED.
int	led_off (const struct device *dev, uint32_t led)
	Turn off an LED.

Detailed Description

LED Interface.

Since

1.12

Version

1.0.0

Typedef Documentation

led_api_blink

led_api_blink

#include <zephyr/drivers/led.h>

Callback API for blinking an LED.

See also

led_blink() for argument descriptions.

led_api_get_info

led_api_get_info

#include <zephyr/drivers/led.h>

Optional API callback to get LED information.

See also

led_get_info() for argument descriptions.

led_api_off

led_api_off

#include <zephyr/drivers/led.h>

Callback API for turning off an LED.

See also

led_off() for argument descriptions.

led_api_on

led_api_on

#include <zephyr/drivers/led.h>

Callback API for turning on an LED.

See also

led_on() for argument descriptions.

led_api_set_brightness

led_api_set_brightness

#include <zephyr/drivers/led.h>

Callback API for setting brightness of an LED.

See also

led_set_brightness() for argument descriptions.

led_api_set_color

led_api_set_color

#include <zephyr/drivers/led.h>

Optional API callback to set the colors of a LED.

See also

led_set_color() for argument descriptions.

led_api_write_channels

led_api_write_channels

#include <zephyr/drivers/led.h>

Callback API for writing a strip of LED channels.

See also

led_api_write_channels() for arguments descriptions.

Function Documentation

led_blink()

int led_blink	(	const struct device *	dev,
		uint32_t	led,
		uint32_t	delay_on,
		uint32_t	delay_off
	)

#include <zephyr/drivers/led.h>

Blink an LED.

This optional routine starts blinking a LED forever with the given time period.

Parameters

dev	LED device
led	LED number
delay_on	Time period (in milliseconds) an LED should be ON
delay_off	Time period (in milliseconds) an LED should be OFF

Returns

0 on success, negative on error

led_get_info()

int led_get_info	(	const struct device *	dev,
		uint32_t	led,
		const struct led_info **	info
	)

#include <zephyr/drivers/led.h>

Get LED information.

This optional routine provides information about a LED.

Parameters

dev	LED device
led	LED number
info	Pointer to a pointer filled with LED information

Returns

0 on success, negative on error

led_off()

int led_off	(	const struct device *	dev,
		uint32_t	led
	)

#include <zephyr/drivers/led.h>

Turn off an LED.

This routine turns off an LED

Parameters

dev	LED device
led	LED number

Returns

0 on success, negative on error

led_on()

int led_on	(	const struct device *	dev,
		uint32_t	led
	)

#include <zephyr/drivers/led.h>

Turn on an LED.

This routine turns on an LED

Parameters

dev	LED device
led	LED number

Returns

0 on success, negative on error

led_set_brightness()

int led_set_brightness	(	const struct device *	dev,
		uint32_t	led,
		uint8_t	value
	)

#include <zephyr/drivers/led.h>

Set LED brightness.

This optional routine sets the brightness of a LED to the given value. Calling this function after led_blink() won't affect blinking.

LEDs which can only be turned on or off may provide this function. These should simply turn the LED on if value is nonzero, and off if value is zero.

Parameters

dev	LED device
led	LED number
value	Brightness value to set in percent

Returns

0 on success, negative on error

led_set_channel()

int led_set_channel	(	const struct device *	dev,
		uint32_t	channel,
		uint8_t	value
	)

#include <zephyr/drivers/led.h>

Set a single LED channel.

This optional routine sets a single LED channel to the given value.

Calling this function after led_blink() won't affect blinking.

Parameters

dev	LED device
channel	Absolute channel number (i.e. not relative to a LED)
value	Value to configure the channel with

Returns

0 on success, negative on error

led_set_color()

int led_set_color	(	const struct device *	dev,
		uint32_t	led,
		uint8_t	num_colors,
		const uint8_t *	color
	)

#include <zephyr/drivers/led.h>

Set LED color.

This routine configures all the color channels of a LED with the given color array.

Calling this function after led_blink() won't affect blinking.

Parameters

dev	LED device
led	LED number
num_colors	Number of colors in the array.
color	Array of colors. It must be ordered following the color mapping of the LED controller. See the color_mapping member in struct led_info.

Returns

0 on success, negative on error

led_write_channels()

int led_write_channels	(	const struct device *	dev,
		uint32_t	start_channel,
		uint32_t	num_channels,
		const uint8_t *	buf
	)

#include <zephyr/drivers/led.h>

Write/update a strip of LED channels.

This optional routine writes a strip of LED channels to the given array of levels. Therefore it can be used to configure several LEDs at the same time.

Calling this function after led_blink() won't affect blinking.

Parameters

dev	LED device
start_channel	Absolute number (i.e. not relative to a LED) of the first channel to update.
num_channels	The number of channels to write/update.
buf	array of values to configure the channels with. num_channels entries must be provided.

Returns

0 on success, negative on error