LPD8808 based LED Strip

Driver for LPD8808 based LED strips. More...

Detailed Description

Driver for LPD8808 based LED strips.

LPD8808 based LED strips consist of a number of LEDs driven by LPD8808 chips. In these strips, each LED can be controlled individually. For this, every two LEDs are driven by a LPD8808 chip, which are chained and form a long shift register. To control a certain LED, the target color value needs to be shifted to the LEDs position on the strip.

This driver implementation does not buffer the current values for each LED. It expects the application to take care of this.

Files
file	lpd8808.h
	Interface definition for the LPD8808 LED strip driver.
file	lpd8808_params.h
	Default configuration for LPD8808 based LED strips.

Data Structures
struct	lpd8808_params_t
	Parameters needed for configuration. More...

Typedefs
typedef lpd8808_params_t	lpd8808_t
	Device descriptor, same as the configuration parameters.

Functions
int	lpd8808_init (lpd8808_t *dev, const lpd8808_params_t *params)
	Initialize the given LPD8808 based LED strip.
void	lpd8808_load_rgb (const lpd8808_t *dev, color_rgb_t vals[])
	Set the color value of each LED on the strip.

Typedef Documentation

lpd8808_t

typedef lpd8808_params_t lpd8808_t

Device descriptor, same as the configuration parameters.

Definition at line 52 of file lpd8808.h.

Function Documentation

lpd8808_init()

int lpd8808_init	(	lpd8808_t *	dev,
		const lpd8808_params_t *	params
	)

Initialize the given LPD8808 based LED strip.

Parameters

[out]	dev	device to initialize
[in]	params	parameters used for initialization

Returns

0 on success

<0 on error

lpd8808_load_rgb()

void lpd8808_load_rgb	(	const lpd8808_t *	dev,
		color_rgb_t	vals[]
	)

Set the color value of each LED on the strip.

This function sets the color value of each LED on the strip by shifting out the corresponding color values one after the other. The function expects an array of color_rgb_t values of the same length as LEDs on the strip.

Parameters

[in]	dev	device to load color values to
[in]	vals	array of color values, MUST be of same length as LEDs on the strip