Adding a very small tron/snake like game

firmware/l0dable/tron.c

@@ -0,0 +1,98 @@
+#include <sysinit.h>
+#include <stdio.h>
+
+#include "basic/basic.h"
+#include "basic/random.h"
+#include "lcd/display.h"
+#include "usetable.h"
+
+void randomizeCoin(int* x, int* y);
+
+void ram() {
+	int key;
+
+	int d = 0;
+	int x = RESX / 2;
+	int y = RESY / 2;
+
+	int p = 0;
+	int q, r;
+
+	randomizeCoin(&q, &r);
+
+	lcdClear();
+
+	while (1) {
+		// display
+		lcdSetPixel(q, r, p % 3);
+		lcdSetPixel(x, y, 1);
+		lcdDisplay();
+
+		// wait
+
+		delayms(20);
+
+		// input
+
+		key=getInputRaw();
+
+		switch(key) {
+			case BTN_RIGHT:
+				d = 3;
+				break;
+			case BTN_LEFT:
+				d = 2;
+				break;
+			case BTN_UP:
+				d = 0;
+				break;
+			case BTN_DOWN:
+				d = 1;
+				break;
+			case BTN_ENTER:
+				return;
+		}
+
+		// step
+
+		if(d > 1) {
+			x = (RESX + x + (d & 1) * 2 - 1) % RESX;
+		} else {
+			y = (RESY + y + d * 2 - 1) % RESY;
+		}
+
+		p += 1;
+
+		// collision
+
+		if(x == q && y == r) {
+			p += 99;
+			randomizeCoin(&q, &r);
+		} else if(lcdGetPixel(x, y)) {
+			lcdClear();
+			lcdPrintln("You lost!");
+			lcdNl();
+			lcdPrintInt(p);
+			lcdPrintln(" points");
+			lcdDisplay();
+
+			while(getInputRaw() != BTN_ENTER);
+
+			return;
+		}
+	}
+	return;
+}
+
+void randomizeCoin(int* x, int* y) {
+	// WARNING: if you are really got at this the game freezes :D
+	for(;;) {
+		*x = getRandom() % RESX;
+		*y = getRandom() % RESY;
+
+		if(!lcdGetPixel(*x, *y)) {
+			return;
+		}
+	}
+}
+