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/*
* Light_WS2812 library example - RGB_blinky
*
* cycles one LED through red, green, blue
*
* This example is configured for a ATtiny85 with PLL clock fuse set and
* the WS2812 string connected to PB4.
*/
#include "project.h"
#define N_COLORS 288
#define N_LEDS 24
struct RGB color[N_COLORS];
struct RGB led[N_LEDS];
static int
map (int j, int n)
{
j = (255UL * j) / n;
if (j > 255)
j = 255;
return j;
}
static int
ramp (int j, int n)
{
if ((j >= -n) && (j < 0))
return map (j + n, n);
if ((j >= 0) && (j <= n))
return map (n - j, n);
return 0;
}
static void
setup_colors (struct RGB *colors, int n)
{
int i;
int n3 = n / 3;
for (i = 0; i < n; ++i)
{
colors[i].r = ramp (((i) % n) - n3, n3);
colors[i].g = ramp (((i + n3) % n) - n3, n3);
colors[i].b = ramp (((i + n3 + n3) % n) - n3, n3);
printf ("%3d: %3d %3d %3d\n", i, colors[i].r, colors[i].g, colors[i].b);
}
}
int
main (void)
{
int i, j, k;
setup_clocks ();
stdio_init ();
setup_colors (color, N_COLORS);
i = 0;
while (1)
{
for (j = 0; j < N_LEDS; ++j)
{
k = (j * (N_COLORS - 1)) / (N_LEDS - 1);
k += i;
while (k >= N_COLORS)
k -= N_COLORS;
led[j] = color[k];
}
ws2812_setleds (led, N_LEDS);
delay_ms (5); // wait for 500ms.
i++;
i %= N_COLORS;
}
}
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