Diff: main.cpp

Revision:

0:3bb97062a703

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Mar 12 23:02:59 2017 +0000
@@ -0,0 +1,67 @@
+#include "mbed.h"
+#include "WS2812.h"
+#include "PixelArray.h"
+
+#define WS2812_BUF 77   //number of LEDs in the array
+#define NUM_COLORS 2    //number of colors to store in the array
+
+DigitalOut usrLed(LED1);
+PixelArray px(WS2812_BUF);
+
+// See the program page for information on the timing numbers
+WS2812 ws(D9, WS2812_BUF, 6,17,9,14);   //nucleo-f411re
+
+int color_set(uint8_t red,uint8_t green, uint8_t blue)
+{
+  return ((red<<16) + (green<<8) + blue);   
+}
+
+// 0 <= stepNumber <= lastStepNumber
+int interpolate(int startValue, int endValue, int stepNumber, int lastStepNumber)
+{
+    return (endValue - startValue) * stepNumber / lastStepNumber + startValue;
+}
+
+int main()
+{    
+    uint8_t ir = 0;
+    uint8_t ig = 0;
+    uint8_t ib = 0;
+    
+    ws.useII(WS2812::PER_PIXEL); // use per-pixel intensity scaling
+    
+    // set up the colours we want to draw with
+    int colorbuf[NUM_COLORS] = {0xff0000,0x0000ff};
+    
+    //get starting RGB components for interpolation
+    std::size_t c1 = colorbuf[0];
+    std::size_t r1 = (c1 & 0xff0000) >> 16;
+    std::size_t g1 = (c1 & 0x00ff00) >> 8;
+    std::size_t b1 = (c1 & 0x0000ff);
+    
+    //get ending RGB components for interpolation
+    std::size_t c2 = colorbuf[1];
+    std::size_t r2 = (c2 & 0xff0000) >> 16;
+    std::size_t g2 = (c2 & 0x00ff00) >> 8;
+    std::size_t b2 = (c2 & 0x0000ff);
+    
+    for (int i = 0; i <= WS2812_BUF; i++)
+    {
+        ir = interpolate(r1, r2, i, WS2812_BUF);
+        ig = interpolate(g1, g2, i, WS2812_BUF);
+        ib = interpolate(b1, b2, i, WS2812_BUF);
+        
+        //write the color value for each pixel
+        px.Set(i, color_set(ir,ig,ib));
+        
+        //write the II value for each pixel
+        px.SetI(i, 32);
+    }
+    
+    for (int i = WS2812_BUF; i >= 0; i--) 
+    {
+        ws.write(px.getBuf());
+    }
+    
+    usrLed = 1;
+}