Diff: main.cpp

Revision:

0:61c89e1770be

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Nov 15 10:29:31 2015 +0000
@@ -0,0 +1,64 @@
+#include "mbed.h"
+#include "neopixel.h"
+ 
+// This must be an SPI MOSI pin.
+#define DATA_PIN dp2
+
+#define N_COL   8
+#define N_ROW   8
+#define N_LED   (N_COL * N_ROW)
+
+#define N_WAVE  128
+
+float wave[N_WAVE];
+int   gSpeed;
+
+void generate(neopixel::Pixel * out, uint32_t index, uintptr_t extra)
+{
+    uint8_t red, green, blue;
+    
+    int x = index % N_COL;
+
+    red = green = blue = 0;
+    uint8_t val = 8.0 * wave[((x+extra)*gSpeed) % N_WAVE] + 16.0 * wave[extra % N_WAVE] + 16.0;
+    val = val / 2;
+    if (x <= 2) {
+        blue = val;
+    } else if (x <= 5) {
+        red = green = blue = val / 2;
+    } else {
+        red = val;
+    }
+
+    out->red   = red;
+    out->green = green;
+    out->blue  = blue;
+}
+ 
+int main()
+{
+    // Create a temporary DigitalIn so we can configure the pull-down resistor.
+    // (The mbed API doesn't provide any other way to do this.)
+    // An alternative is to connect an external pull-down resistor.
+    DigitalIn(DATA_PIN, PullDown);
+ 
+    // The pixel array control class.
+    neopixel::PixelArray array(DATA_PIN);
+ 
+    for (int i = 0; i < N_WAVE; i++) {
+        wave[i] = sin((float)i / (float)N_WAVE * 3.14159265 * 2.0) * 0.5 + 0.5;
+    }
+    
+    int offset = 0;
+    gSpeed = 8;
+    
+    while(1) {
+        array.update(generate, N_LED, offset++);
+        if (offset >= N_WAVE) {
+            offset = 0;
+            gSpeed = (rand() % 8) + 4;
+        }
+        
+        wait_ms(20);
+    }                
+}