Diff: main.cpp

Revision:

0:02f4f92c778a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jun 19 00:10:54 2016 +0000
@@ -0,0 +1,103 @@
+#include "mbed.h"
+#include "ws2811BitBang.h"
+#include "ColorConversion.h"
+
+#define NLED (50*6)
+
+DigitalIn button(USER_BUTTON);
+
+DigitalOut boardLED(LED1);
+
+DigitalOut ws2811Data(PA_8);
+
+uint8_t bufferRGB[NLED*3];
+
+int bufferHS0[NLED*2]; //hue & saturation; value is constant. all variables are fixed precision with scale factor 1000.
+int bufferHS1[NLED*2]; //double buffer, for manipulation & swap
+#define CVALUE 1000
+
+
+#define max(a,b) ((a)>=(b)?(a):(b))
+
+    
+void fillHS0(int hue, int saturation,int hinc){
+    int hadd=0;
+    for(size_t i=0;i<NLED;i++){
+        bufferHS0[2*i]=(hue+hadd)%360000;
+        bufferHS0[2*i+1]=saturation;
+        hadd+=hinc;
+    }
+}
+
+/*
+I made up this shimmer function as I went along; the idea is to make the lights whiteish (low saturation) most of the time
+but occasionally have local patches of lights shimmer with color in a way that travels along the string of lights in a wave
+and slowly settles down. 1/splashArrival is the probability that a splash of color will be added to the chain during this
+call.
+*/
+void shimmer(int *buf0, int *buf1, size_t len, 
+             int splashArrival = 10,
+             int restingSaturation=0,
+             int restingWeight=1,
+             int neighborWeight=99){
+    int totalWeight = restingWeight+neighborWeight;
+    int event = rand() % splashArrival;
+    if(event==0){
+        int led = rand() % (len-5);
+        int hue = rand() % (10*360000);
+        int sat = 600;//rand() % 1000;
+        for(size_t i=0;i<5;i++){
+            buf0[2*(led+i)] = hue;
+            buf0[2*(led+i)+1]=sat;
+        }
+    }
+    for(size_t i=0;i<len;i++){
+        int hl,hc,hr,sl,sc,sr;
+        if(i==0){
+            hl=buf0[2*(len-1)];
+            sl=restingSaturation;
+            hr=buf0[2*(i+1)];
+            sr=buf0[2*(i+1)+1];
+        }else if(i==len-1){
+            hl=buf0[2*(i-1)];
+            sl=buf0[2*(i-1)+1];
+            hr=buf0[0];
+            sr=restingSaturation;
+        }else{
+            hl=buf0[2*(i-1)];
+            sl=buf0[2*(i-1)+1];
+            hr=buf0[2*(i+1)];
+            sr=buf0[2*(i+1)+1];
+        }
+        hc = buf0[2*i];
+        sc = buf0[2*i+1];
+        buf1[2*i] = (((2*hl+hc+2*hr)/5)*99+300000*1)/100;
+        //printf("baz: %d\n\r",buf1[2*i]);
+        buf1[2*i+1]=(max(sl,max(sc,sr))*neighborWeight+restingSaturation*restingWeight)/totalWeight;
+    }
+}
+
+int main() {
+    
+    int hue = 0;
+    int arrival=1;
+    fillHS0(hue,1000,60000);
+    while(true){
+        if(!button){
+            arrival=1;
+        }
+        shimmer(bufferHS0,bufferHS1,NLED,arrival);
+        convertHSVtoRGB(bufferHS1,bufferRGB,NLED,CVALUE);
+        sendBuffer(bufferRGB,NLED,ws2811Data);
+        boardLED = !boardLED;
+    
+        shimmer(bufferHS1,bufferHS0,NLED,arrival);
+        convertHSVtoRGB(bufferHS0,bufferRGB,NLED,CVALUE);
+        sendBuffer(bufferRGB,NLED,ws2811Data);
+        boardLED = !boardLED;
+        
+        if(arrival < 10){
+            arrival++;
+        }
+    }
+}