main.c
3.15 KB
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/*
* Copyright (C) 2017 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 APA102 LED strip driver
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include "xtimer.h"
#include "color.h"
#include "apa102.h"
#include "apa102_params.h"
/**
* @brief Switch to the next LED every 10ms
*/
#define STEP (200 * US_PER_MS)
/**
* @brief Interval for dimming colors
*/
#define DIM (100 * US_PER_MS)
/**
* @brief Step through brightness levels (0-255) in 32 steps
*/
#define BSTEP (8U)
/**
* @brief Allocate the device descriptor
*/
static apa102_t dev;
/**
* @brief Allocate a color_rgb_t struct for each LED on the strip
*/
static color_rgba_t leds[APA102_PARAM_LED_NUMOF];
static void setcolor(int color, uint8_t alpha)
{
for (int i = 0; i < (int)APA102_PARAM_LED_NUMOF; i++) {
leds[i].alpha = alpha;
memset(&leds[i].color, 0, sizeof(color_rgb_t));
switch (color) {
case 0:
leds[i].color.r = 255;
break;
case 1:
leds[i].color.g = 255;
break;
case 2:
leds[i].color.b = 255;
break;
}
}
}
int main(void)
{
int pos = 0;
int step = 1;
color_hsv_t col = { 0.0, 1.0, 1.0 };
puts("APA102 Test App");
/* initialize all LED color values to black (off) */
memset(leds, 0, sizeof(color_rgba_t) * APA102_PARAM_LED_NUMOF);
/* initialize the driver */
apa102_init(&dev, &apa102_params[0]);
puts("Initialization done.");
/* set to each red, green, and blue, and fade each color in and out */
for (int col = 0; col <= 2; col++) {
int i = 0;
for (; i <= (int)UINT8_MAX; i += BSTEP) {
setcolor(col, (uint8_t)i);
apa102_load_rgba(&dev, leds);
xtimer_usleep(DIM);
}
i -= BSTEP;
for (; i >= 0; i -= BSTEP) {
setcolor(col, (uint8_t)i);
apa102_load_rgba(&dev, leds);
xtimer_usleep(DIM);
}
}
puts("Color Fading done");
/* reset color values */
setcolor(-1, 255);
apa102_load_rgba(&dev, leds);
xtimer_ticks32_t now = xtimer_now();
while (1) {
/* change the active color by running around the hue circle */
col.h += 1.0;
if (col.h > 360.0) {
col.h = 0.0;
}
/* set the active LED to the active color value */
memset(&leds[pos].color, 0, sizeof(color_rgb_t));
pos += step;
color_hsv2rgb(&col, &leds[pos].color);
/* apply the values to the LED strip */
apa102_load_rgba(&dev, leds);
/* switch direction once reaching an end of the strip */
if ((pos == (APA102_PARAM_LED_NUMOF - 1)) || (pos == 0)) {
step *= -1;
}
xtimer_periodic_wakeup(&now, STEP);
}
return 0;
}