main.c
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/*
* Copyright (C) 2016 Freie Universität 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.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Test application for the LPD8808 LED strip driver
*
* Refer to the accompanying README.md for more information.
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include <string.h>
#include <stdio.h>
#include "xtimer.h"
#include "lpd8808.h"
#include "lpd8808_params.h"
/**
* @brief Switch to the next LED every 10ms
*/
#define STEP (10 * 1000U)
/**
* @brief Allocate the device descriptor
*/
static lpd8808_t dev;
/**
* @brief Allocate a color_rgb_t struct for each LED on the strip
*/
static color_rgb_t leds[LPD8808_PARAM_LED_CNT];
int main(void)
{
xtimer_ticks32_t now = xtimer_now();
int pos = 0;
int step = 1;
color_hsv_t col = { 0.0, 1.0, 1.0 };
/* initialize all LED color values to black (off) */
memset(leds, 0, sizeof(color_rgb_t) * LPD8808_PARAM_LED_CNT);
/* initialize the driver */
lpd8808_init(&dev, &lpd8808_params[0]);
while (1) {
/* change the active color by running around the hue circle */
col.h += 1.0;
if (col.h > 360.0) {
col.h = 0;
}
/* set the active LED to the active color value */
memset(&leds[pos], 0, sizeof(color_rgb_t));
pos += step;
color_hsv2rgb(&col, &leds[pos]);
/* apply the values to the LED strip */
lpd8808_load_rgb(&dev, leds);
/* switch direction once reaching an end of the strip */
if ((pos == (LPD8808_PARAM_LED_CNT - 1)) || (pos == 0)) {
step *= -1;
}
xtimer_periodic_wakeup(&now, STEP);
}
return 0;
}