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/*
* Copyright (C) 2016 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup drivers_lpd8808 LPD8808 based LED Strip
* @ingroup drivers
* @brief 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.
*
* @{
* @file
* @brief Interface definition for the LPD8808 LED strip driver
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef LPD8808_H
#define LPD8808_H
#include "color.h"
#include "periph/gpio.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Parameters needed for configuration
*/
typedef struct {
int led_cnt; /**< number of LEDs on the strip */
gpio_t pin_clk; /**< pin connected to the strip's clock signal */
gpio_t pin_dat; /**< pin connected to the strip's data signal */
} lpd8808_params_t;
/**
* @brief Device descriptor, same as the configuration parameters
*/
typedef lpd8808_params_t lpd8808_t;
/**
* @brief Initialize the given LPD8808 based LED strip
*
* @param[out] dev device to initialize
* @param[in] params parameters used for initialization
*
* @return 0 on success
* @return <0 on error
*/
int lpd8808_init(lpd8808_t *dev, const lpd8808_params_t *params);
/**
* @brief 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 @p color_rgb_t values of the same length as LEDs on the strip.
*
* @param[in] dev device to load color values to
* @param[in] vals array of color values, MUST be of same length as LEDs on
* the strip
*/
void lpd8808_load_rgb(lpd8808_t *dev, color_rgb_t vals[]);
#ifdef __cplusplus
}
#endif
#endif /* LPD8808_H */
/** @} */
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