Diff: main.cpp

Revision:

0:647dde9749db

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jan 16 20:47:05 2012 +0000
@@ -0,0 +1,125 @@
+#include "mbed.h"
+#include "lut.h"
+
+SPI spi(p11, p12, p13);
+DigitalOut latchpin(p10);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+InterruptIn hall(p7);
+
+#define LEDS 96
+#define MAX_BRIGHTNESS 4095
+
+void HSVtoRGB( int  *r, int *g,int *b, int h, int s, int v );
+
+
+void hall_fall() {
+    led1 = 1;
+}
+
+void hall_rise() {
+    led1 = 0;
+}
+
+void latch() {
+    latchpin = 1;
+    latchpin = 1;
+    latchpin = 1;
+    latchpin = 1;
+    latchpin = 1;
+    latchpin = 1;
+    latchpin = 0;
+}
+
+int main() {
+    // When magnet goes near Hall-effect sensor, its output will go LOW
+    hall.fall(&hall_fall);
+    hall.rise(&hall_rise);
+
+    spi.format(12, 0);
+    spi.frequency(16 * 1000 * 1000);
+
+    int brightness = 0;
+    int dir = 0;
+    int r, g, b;
+
+    latchpin = 0;
+    while (1) {
+        for (int h = 3599; h >= 0; h--) {
+            for (int i = LEDS-1; i >= 0; i--) {
+                HSVtoRGB(&r, &g, &b, h + i*150/4, 4095, brightness / 4);
+
+                spi.write(gamma[b]);
+                spi.write(gamma[g]);
+                spi.write(gamma[r]);
+            }
+            latch();
+
+            if (dir == 0) {
+                brightness += 1;
+                if (brightness >= 4096) {
+                    brightness = 4095;
+                    dir = 1;
+                }
+            } else {
+                brightness -= 1;
+                if (brightness < 0) {
+                    brightness = 0;
+                    dir = 0;
+                }
+            }
+        }
+    }
+}
+
+void HSVtoRGB( int  *r, int *g,int *b, int h, int s, int v ) {
+    int f;
+    int p, q, t;
+
+    if ( s == 0 ) {
+        *r = *g = *b = v;
+        return;
+    }
+
+    h = h % 3600;
+
+    f = ((h%600)*4095)/600;
+    h /= 600;
+
+    p = (v * (4096-s))/4096;
+    q = (v * (4096 - (s*f)/4096))/4096;
+    t = (v * (4096 - (s*(4096-f))/4096))/4096;
+
+    switch ( h ) {
+        case 0:
+            *r = v;
+            *g = t;
+            *b = p;
+            break;
+        case 1:
+            *r = q;
+            *g = v;
+            *b = p;
+            break;
+        case 2:
+            *r = p;
+            *g = v;
+            *b = t;
+            break;
+        case 3:
+            *r = p;
+            *g = q;
+            *b = v;
+            break;
+        case 4:
+            *r = t;
+            *g = p;
+            *b = v;
+            break;
+        default:        // case 5:
+            *r = v;
+            *g = p;
+            *b = q;
+            break;
+    }
+}
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