Erik Tryggvason
Displays a gradient between two colors
Dependencies: PixelArray WS2812 mbed
Revision 0:3bb97062a703, committed 2017-03-12
- Comitter:
- theros
- Date:
- Sun Mar 12 23:02:59 2017 +0000
- Commit message:
- First Commit
Changed in this revision
diff -r 000000000000 -r 3bb97062a703 PixelArray.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PixelArray.lib Sun Mar 12 23:02:59 2017 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/chris/code/PixelArray/#b45a70faaa83
diff -r 000000000000 -r 3bb97062a703 WS2812.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/WS2812.lib Sun Mar 12 23:02:59 2017 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/bridadan/code/WS2812/#6e647820f587
diff -r 000000000000 -r 3bb97062a703 main.cpp
--- /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;
+}
diff -r 000000000000 -r 3bb97062a703 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sun Mar 12 23:02:59 2017 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e1686b8d5b90 \ No newline at end of file