Diff: LedStrip.cpp

Revision:

0:a8535703f23b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LedStrip.cpp	Sat Jan 04 00:40:08 2014 +0000
@@ -0,0 +1,80 @@
+#include "LedStrip.h"
+
+LedStrip::LedStrip(int n)
+{
+   // Allocate 3 bytes per pixel:
+    numLEDs = n;
+    pixels = (uint8_t *)malloc(numPixelBytes());
+    if (pixels) {
+        memset(pixels, 0x00, numPixelBytes()); // Init to RGB 'off' state
+    }
+}
+
+LedStrip::~LedStrip()
+{
+    free(pixels);
+}
+ 
+uint32_t LedStrip::total_luminance(void)
+{
+    uint32_t running_total;
+    running_total = 0;
+    for (int i=0; i< numPixelBytes(); i++)
+        running_total += pixels[i];
+    return running_total;
+}
+
+// Convert R,G,B to combined 32-bit color
+uint32_t LedStrip::Color(uint8_t r, uint8_t g, uint8_t b)
+{
+    // Take the lowest 7 bits of each value and append them end to end
+    // We have the top bit set high (its a 'parity-like' bit in the protocol
+    // and must be set!)
+    return ((uint32_t)g << 16) | ((uint32_t)r << 8) | (uint32_t)b;
+}
+
+// store the rgb component in our array
+void LedStrip::setPixelColor(uint16_t n, uint8_t r, uint8_t g, uint8_t b)
+{
+    if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
+
+    pixels[n*3  ] = g;
+    pixels[n*3+1] = r;
+    pixels[n*3+2] = b;
+}
+
+void LedStrip::setPixelR(uint16_t n, uint8_t r)
+{
+    if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
+
+    pixels[n*3+1] = r;
+}
+
+void LedStrip::setPixelG(uint16_t n, uint8_t g)
+{
+    if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
+
+    pixels[n*3] = g;
+}
+
+void LedStrip::setPixelB(uint16_t n, uint8_t b)
+{
+    if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
+
+    pixels[n*3+2] = b;
+}
+
+void LedStrip::setPackedPixels(uint8_t * buffer, uint32_t n)
+{
+    if (n >= numLEDs) return;
+    memcpy(pixels, buffer, (size_t) (n*3));
+}
+
+void LedStrip::setPixelColor(uint16_t n, uint32_t c)
+{
+    if (n >= numLEDs) return; // '>=' because arrays are 0-indexed
+
+    pixels[n*3  ] = (c >> 16);
+    pixels[n*3+1] = (c >>  8);
+    pixels[n*3+2] =  c;
+}