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140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
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* Copyright (C) 2017 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup tests
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* @{
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*
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* @file
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* @brief Test application for the APA102 LED strip driver
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <string.h>
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#include <stdio.h>
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#include <stdint.h>
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#include "xtimer.h"
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#include "color.h"
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#include "apa102.h"
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#include "apa102_params.h"
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/**
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* @brief Switch to the next LED every 10ms
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*/
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#define STEP_MS (200 * US_PER_MS)
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/**
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* @brief Interval for dimming colors
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*/
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#define DIM (100 * US_PER_MS)
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/**
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* @brief Step through brightness levels (0-255) in 32 steps
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*/
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#define BSTEP (8U)
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/**
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* @brief Allocate the device descriptor
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*/
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static apa102_t dev;
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/**
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* @brief Allocate a color_rgb_t struct for each LED on the strip
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*/
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static color_rgba_t leds[APA102_PARAM_LED_NUMOF];
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static void setcolor(int color, uint8_t alpha)
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{
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for (int i = 0; i < (int)APA102_PARAM_LED_NUMOF; i++) {
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leds[i].alpha = alpha;
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memset(&leds[i].color, 0, sizeof(color_rgb_t));
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switch (color) {
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case 0:
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leds[i].color.r = 255;
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break;
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case 1:
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leds[i].color.g = 255;
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break;
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case 2:
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leds[i].color.b = 255;
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break;
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}
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}
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}
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int main(void)
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{
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int pos = 0;
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int step = 1;
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color_hsv_t col = { 0.0, 1.0, 1.0 };
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puts("APA102 Test App");
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/* initialize all LED color values to black (off) */
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memset(leds, 0, sizeof(color_rgba_t) * APA102_PARAM_LED_NUMOF);
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/* initialize the driver */
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apa102_init(&dev, &apa102_params[0]);
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puts("Initialization done.");
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/* set to each red, green, and blue, and fade each color in and out */
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for (int col = 0; col <= 2; col++) {
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int i = 0;
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for (; i <= (int)UINT8_MAX; i += BSTEP) {
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setcolor(col, (uint8_t)i);
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apa102_load_rgba(&dev, leds);
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xtimer_usleep(DIM);
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}
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i -= BSTEP;
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for (; i >= 0; i -= BSTEP) {
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setcolor(col, (uint8_t)i);
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apa102_load_rgba(&dev, leds);
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xtimer_usleep(DIM);
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}
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}
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puts("Color Fading done");
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/* reset color values */
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setcolor(-1, 255);
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apa102_load_rgba(&dev, leds);
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xtimer_ticks32_t now = xtimer_now();
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while (1) {
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/* change the active color by running around the hue circle */
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col.h += 1.0;
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if (col.h > 360.0) {
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col.h = 0.0;
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}
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/* set the active LED to the active color value */
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memset(&leds[pos].color, 0, sizeof(color_rgb_t));
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pos += step;
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color_hsv2rgb(&col, &leds[pos].color);
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/* apply the values to the LED strip */
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apa102_load_rgba(&dev, leds);
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/* switch direction once reaching an end of the strip */
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if ((pos == (APA102_PARAM_LED_NUMOF - 1)) || (pos == 0)) {
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step *= -1;
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}
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xtimer_periodic_wakeup(&now, STEP_MS);
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}
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return 0;
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}
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