initial

FIRMWARE/mandel_C.c

@@ -0,0 +1,99 @@
+/*
+ Computes and displays the Mandelbrot set on the OLED display.
+*/
+
+#include <stdio.h>
+
+#ifdef __linux__
+#include <unistd.h>
+#else
+#include "io.h"
+#endif
+
+#define W 46
+#define H 46
+
+#define mandel_shift 10
+#define mandel_mul (1 << mandel_shift)
+#define xmin -2*mandel_mul
+#define ymax  2*mandel_mul
+#define ymin -2*mandel_mul
+#define xmax  2*mandel_mul
+#define dx (xmax-xmin)/H
+#define dy (ymax-ymin)/H
+#define norm_max (4 << mandel_shift)
+
+
+#define ANSIRGB(R,G,B) "\033[48;2;" #R ";"  #G ";" #B "m  "
+
+
+const char* colormap[21] = {
+   ANSIRGB( 0, 0,  0),
+   ANSIRGB( 0, 0, 40),
+   ANSIRGB( 0, 0, 80),
+   ANSIRGB( 0, 0,120),
+   ANSIRGB( 0, 0,160),
+   ANSIRGB( 0, 0,200),
+   ANSIRGB( 0, 0,240),
+   
+   ANSIRGB( 0,  0, 0),
+   ANSIRGB( 0, 40, 0),
+   ANSIRGB( 0, 80, 0),
+   ANSIRGB( 0,120, 0),
+   ANSIRGB( 0,160, 0),
+   ANSIRGB( 0,200, 0),
+   ANSIRGB( 0,240, 0),
+
+   ANSIRGB(   0, 0, 0),
+   ANSIRGB(  40, 0, 0),
+   ANSIRGB(  80, 0, 0),
+   ANSIRGB( 120, 0, 0),
+   ANSIRGB( 160, 0, 0),
+   ANSIRGB( 200, 0, 0),
+   ANSIRGB( 240, 0, 0)
+};
+
+int main() {
+   int frame=0;
+   for(;;) {
+      IO_OUT(IO_LEDS,frame);
+      int last_color = -1;
+      printf("\033[H");
+      int Ci = ymin;
+      for(int Y=0; Y<H; ++Y) {
+	 int Cr = xmin;
+	 for(int X=0; X<W; ++X) {
+	    int Zr = Cr;
+	    int Zi = Ci;
+	    int iter = 20;
+	    while(iter > 0) {
+	       int Zrr = (Zr * Zr) >> mandel_shift;
+	       int Zii = (Zi * Zi) >> mandel_shift;
+	       int Zri = (Zr * Zi) >> (mandel_shift - 1);
+	       Zr = Zrr - Zii + Cr;
+	       Zi = Zri + Ci;
+	       if(Zrr + Zii > norm_max) {
+		  break;
+	       }
+	       --iter;
+	    }
+	    int color = (iter+frame)%21;
+	    printf(color == last_color ? "  " : colormap[color]);
+	    last_color = color;
+	    Cr += dx;
+	 }
+	 Ci += dy;
+	 printf("\033[49m\n");	 
+	 last_color = -1;
+      }
+      ++frame;
+#ifdef __linux__       
+        usleep(100000);
+#endif
+//      if(frame>4) break;
+   }
+   
+}
+
+
+