Experimental WS2812 driver and pixel buffer

Revision:
2:57db905622ca
Parent:
1:bf4d674d3692
```--- a/main.cpp	Mon Aug 18 13:27:10 2014 +0000
+++ b/main.cpp	Mon Aug 18 13:55:20 2014 +0000
@@ -12,45 +12,34 @@
int main()
{

-    int ctr=0;
ws.useII(2); // use per-pixel intensity scaling

// set up the colours we want to draw with
int colorbuf[6] = {0x2f0000,0x2f2f00,0x002f00,0x002f2f,0x00002f,0x2f002f};

-
-    int h=0;
-
// for each of the colours (j) write out 10 of them
-    // the pixel get written at the rotation offset, plus the colour*10, plus the colour position
+    // the pixels are written at the colour*10, plus the colour position
// all modulus 60 so it wraps around
for (int i =0; i<6; i++) {
for (int j=0; j<10; j++) {
-            px.Set((h+(i*10)+j)%60,colorbuf[i]);
+            px.Set(((i*10)+j)%60,colorbuf[i]);
}
}

-    // now all the colours are computed, add a fade effect
+    // now all the colours are computed, add a fade effect using intensity scaling
// compute and write the II value for each pixel
for (int j=0; j<60; j++) {
// px.SetI(pixel position, II value)
-        px.SetI(    (h+j)%60,   0xf+(0xf*(j%10)));
+        px.SetI(j%60, 0xf+(0xf*(j%10)));
}

-    // the buffer is written
-    // rotate by writing it out with an increasing offset

-
+    // Now the buffer is written, rotate it
+    // by writing it out with an increasing offset
while (1) {
for (int z=59; z >= 0 ; z--) {
-            ws.write_offsets(px.getBuf(),z,z,z); // write out the buffer
+            ws.write_offsets(px.getBuf(),z,z,z);
wait(0.075);
-            if (ctr==1000) {
-                ctr=0;
-                led=!led;
-            } else {
-                ctr++;
-            }
}
}

```