diff --git a/devel/cstruct.h b/devel/cstruct.h
deleted file mode 100644
index 845bd8c..0000000
--- a/devel/cstruct.h
+++ /dev/null
@@ -1,5 +0,0 @@
-#pragma once
-
-#define loop(varname, count) for(uint8_t varname = 0; varname < (count); varname++)
-#define repeat(count) for(uint8_t _repeat_i = 0; _repeat_i < (count); _repeat_i++)
-#define until(cond) while(!(cond))
diff --git a/devel/lcdsnake/main.c b/devel/lcdsnake/main.c
deleted file mode 100644
index e8f76a6..0000000
--- a/devel/lcdsnake/main.c
+++ /dev/null
@@ -1,182 +0,0 @@
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <avr/pgmspace.h>
-#include <util/delay.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#include "lib/meta.h"
-#include "lib/arduino_pins.h"
-#include "lib/calc.h"
-
-#define LCD_PIN_RS D10
-#define LCD_PIN_RW D11
-#define LCD_PIN_E  D12
-#define LCD_PIN_D4 D13
-#define LCD_PIN_D5 D14
-#define LCD_PIN_D6 D15
-#define LCD_PIN_D7 D16
-// D17 = A3 = source of entropy for random.
-
-#include "lib/hd44780.h"
-
-
-// Buttons (to ground)
-#define BTN_LEFT     D2
-#define BTN_RIGHT    D3
-#define BTN_UP       D4
-#define BTN_DOWN     D5
-#define BTN_SELECT   D6
-#define BTN_RESTART  D7
-
-// Debouncer channels for buttons
-// (Must be added in this order to debouncer)
-#define D_LEFT      0
-#define D_RIGHT     1
-#define D_UP        2
-#define D_DOWN      3
-#define D_SELECT    4
-#define D_RESTART   5
-
-#define DEBO_CHANNELS 6
-#define DEBO_TICKS 1  // in 0.01s
-
-#include "lib/debounce.h"
-
-// Board size (!!! rows = 2x number of display lines, max 2*4 = 8 !!!)
-#define ROWS 4
-#define COLS 20
-
-// proto
-void render();
-void update();
-
-
-void SECTION(".init8") init()
-{
-	// Randomize RNG
-	adc_init();
-	srand(adc_read_word(3));
-
-	// Init LCD
-	lcd_init();
-
-	// gamepad buttons
-	as_input_pu(BTN_LEFT);
-	as_input_pu(BTN_RIGHT);
-	as_input_pu(BTN_UP);
-	as_input_pu(BTN_DOWN);
-	as_input_pu(BTN_SELECT);
-	as_input_pu(BTN_RESTART);
-
-	// add buttons to debouncer
-	debo_add_rev(BTN_LEFT);
-	debo_add_rev(BTN_RIGHT);
-	debo_add_rev(BTN_UP);
-	debo_add_rev(BTN_DOWN);
-	debo_add_rev(BTN_SELECT);
-	debo_add_rev(BTN_RESTART);
-
-	// setup timer
-	TCCR0A = _BV(WGM01); // CTC
-	TCCR0B = _BV(CS02) | _BV(CS00);  // prescaler 1024
-	OCR0A = 156;  // interrupt every 10 ms
-	sbi(TIMSK0, OCIE0A);
-	sei();
-}
-
-
-/** timer 0 interrupt vector */
-ISR(TIMER0_COMPA_vect)
-{
-	debo_tick();  // poll debouncer
-	update();  // update game state
-	render();
-}
-
-
-
-// sub-glyphs
-#define _HEAD_ 31, 21, 21, 31
-#define _BODY_ 31, 31, 31, 31
-#define _FOOD_ 10, 21, 17, 14
-#define _NONE_  0,  0,  0,  0
-
-// complete glyphs for loading into memory
-
-// Only one food & one head glyph have to be loaded at a time.
-
-// Body - Body
-const uint8_t BB[] PROGMEM = {_BODY_, _BODY_};
-
-// Body - None
-const uint8_t BX[] PROGMEM = {_BODY_, _NONE_};
-const uint8_t XB[] PROGMEM = {_NONE_, _BODY_};
-
-// Head - None
-const uint8_t HX[] PROGMEM = {_HEAD_, _NONE_};
-const uint8_t XH[] PROGMEM = {_NONE_, _HEAD_};
-
-// Body - Head
-const uint8_t BH[] PROGMEM = {_BODY_, _HEAD_};
-const uint8_t HB[] PROGMEM = {_HEAD_, _BODY_};
-
-// Head - Food
-const uint8_t HF[] PROGMEM = {_HEAD_, _FOOD_};
-const uint8_t FH[] PROGMEM = {_FOOD_, _HEAD_};
-
-// Food - None
-const uint8_t FX[] PROGMEM = {_FOOD_, _NONE_};
-const uint8_t XF[] PROGMEM = {_NONE_, _FOOD_};
-
-// Body - Food
-const uint8_t BF[] PROGMEM = {_BODY_, _FOOD_};
-const uint8_t FB[] PROGMEM = {_FOOD_, _BODY_};
-
-// board block (snake, food...)
-typedef enum {
-	EMPTY = 0x00,
-	HEAD = 0x01,
-	FOOD = 0x02,
-	BODY_LEFT = 0x80;
-	BODY_RIGHT = 0x81,
-	BODY_UP = 0x82,
-	BODY_DOWN = 0x83,
-} block_t;
-
-typedef struct {
-	uint8_t x;
-	uint8_t y;
-} coord_t;
-
-#define is_body(blk) ((blk) & 0x80)
-
-// y, x indexing
-block_t board[ROWS][COLS];
-
-coord_t head_pos;
-coord_t food_pos;
-
-
-void main()
-{
-	lcd_define_glyph_pgm(0, BX);
-	lcd_define_glyph_pgm(1, BB);
-	lcd_define_glyph_pgm(2, XB);
-	lcd_define_glyph_pgm(3, XH);
-	lcd_define_glyph_pgm(4, XF);
-
-	// Test
-	lcd_char_xy(5, 0, 0);
-	lcd_char_xy(6, 0, 0);
-	lcd_char_xy(7, 0, 1);
-	lcd_char_xy(7, 1, 0);
-	lcd_char_xy(8, 1, 0);
-	lcd_char_xy(9, 1, 1);
-	lcd_char_xy(10, 1, 2);
-	lcd_char_xy(11, 1, 3);
-	lcd_char_xy(14, 1, 4);
-
-	while(1);
-}
diff --git a/devel/lib/hd44780.h b/devel/lib/lcd.h
similarity index 97%
rename from devel/lib/hd44780.h
rename to devel/lib/lcd.h
index b838f4c..8c45f85 100644
--- a/devel/lib/hd44780.h
+++ b/devel/lib/lcd.h
@@ -6,7 +6,6 @@
 #include <avr/pgmspace.h>
 #include <util/delay.h>
 
-#include "arduino_pins.h"
 #include "calc.h"
 #include "pins.h"
 #include "nsdelay.h"
@@ -103,6 +102,10 @@ void lcd_xy(const uint8_t x, const uint8_t y);
 void lcd_set_addr_cgram(const uint8_t acg);
 /** Set address in DDRAM */
 void lcd_set_addr(const uint8_t add);
+/** Go home */
+void lcd_home();
+/** Clear the screen */
+void lcd_clear();
 
 /** Set cursor */
 #define CURSOR_NONE  0b00
@@ -340,6 +343,20 @@ void lcd_enable()
 }
 
 
+/** Go home */
+void lcd_home()
+{
+	lcd_write_command(LCD_HOME);
+}
+
+
+/** Clear the screen */
+void lcd_clear()
+{
+	lcd_write_command(LCD_CLEAR);
+}
+
+
 /** Define a glyph */
 void lcd_define_glyph(const uint8_t index, const uint8_t* array)
 {
diff --git a/devel/lib/ws2812.h b/devel/lib/ws_rgb.h
similarity index 97%
rename from devel/lib/ws2812.h
rename to devel/lib/ws_rgb.h
index 3d6e0d6..80223c2 100644
--- a/devel/lib/ws2812.h
+++ b/devel/lib/ws_rgb.h
@@ -1,7 +1,7 @@
 #pragma once
 
 /**
-  Utils for driving a WS2812 (WS2812B) RGB LED strips.
+  Utils for driving a WS28xx (tested on WS2812B) RGB LED strips.
 
   It's implemented as macros to avoid overhead when passing values, and to
   enable driving multiple strips at once.
diff --git a/devel/lcdsnake/Makefile b/devel/moo2/Makefile
similarity index 100%
rename from devel/lcdsnake/Makefile
rename to devel/moo2/Makefile
diff --git a/devel/lcdsnake/lcd_default.asm b/devel/moo2/lcd_default.asm
similarity index 100%
rename from devel/lcdsnake/lcd_default.asm
rename to devel/moo2/lcd_default.asm
diff --git a/devel/lcdsnake/lib b/devel/moo2/lib
similarity index 100%
rename from devel/lcdsnake/lib
rename to devel/moo2/lib
diff --git a/devel/moo2/main.c b/devel/moo2/main.c
new file mode 100644
index 0000000..4b5c438
--- /dev/null
+++ b/devel/moo2/main.c
@@ -0,0 +1,426 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "lib/meta.h"
+#include "lib/arduino_pins.h"
+#include "lib/calc.h"
+#include "lib/adc.h"
+
+#define LCD_PIN_RS D10
+#define LCD_PIN_RW D11
+#define LCD_PIN_E  D12
+#define LCD_PIN_D4 D13
+#define LCD_PIN_D5 D14
+#define LCD_PIN_D6 D15
+#define LCD_PIN_D7 D16
+// D17 = A3 = source of entropy for random.
+
+#include "lib/lcd.h"
+
+
+// Buttons (to ground)
+#define BTN_LEFT     D2
+#define BTN_RIGHT    D3
+#define BTN_UP       D4
+#define BTN_DOWN     D5
+#define BTN_SELECT   D6
+#define BTN_RESTART  D7
+
+// Debouncer channels for buttons
+// (Must be added in this order to debouncer)
+#define D_LEFT      0
+#define D_RIGHT     1
+#define D_UP        2
+#define D_DOWN      3
+#define D_SELECT    4
+#define D_RESTART   5
+
+#define DEBO_CHANNELS 6
+#define DEBO_TICKS 1  // in 0.01s
+
+#include "lib/debounce.h"
+
+// Board size (!!! rows = 2x number of display lines, max 2*4 = 8 !!!)
+#define ROWS 4
+#define COLS 20
+
+// Delay between snake steps, in 10 ms
+#define STEP_DELAY 24
+
+// proto
+void update();
+void init_cgram();
+void init_gameboard();
+
+void SECTION(".init8") init()
+{
+	// Randomize RNG
+	adc_init();
+	srand(adc_read_word(3));
+
+	// Init LCD
+	lcd_init();
+	init_cgram();  // load default glyphs
+
+	// Init game board.
+	init_gameboard();
+
+	// gamepad buttons
+	as_input_pu(BTN_LEFT);
+	as_input_pu(BTN_RIGHT);
+	as_input_pu(BTN_UP);
+	as_input_pu(BTN_DOWN);
+	as_input_pu(BTN_SELECT);
+	as_input_pu(BTN_RESTART);
+
+	// add buttons to debouncer
+	debo_add_rev(BTN_LEFT);
+	debo_add_rev(BTN_RIGHT);
+	debo_add_rev(BTN_UP);
+	debo_add_rev(BTN_DOWN);
+	debo_add_rev(BTN_SELECT);
+	debo_add_rev(BTN_RESTART);
+
+	// setup timer
+	TCCR0A = _BV(WGM01); // CTC
+	TCCR0B = _BV(CS02) | _BV(CS00);  // prescaler 1024
+	OCR0A = 156;  // interrupt every 10 ms
+	sbi(TIMSK0, OCIE0A);
+	sei();
+}
+
+
+/** timer 0 interrupt vector */
+ISR(TIMER0_COMPA_vect)
+{
+	debo_tick();  // poll debouncer
+	update();  // update and display
+}
+
+
+
+// sub-glyphs
+#define _HEAD_ 15, 21, 21, 30
+#define _BODY_ 15, 31, 31, 30
+#define _FOOD_ 10, 21, 17, 14
+//14, 17, 17, 14
+#define _NONE_  0,  0,  0,  0
+
+// complete glyphs for loading into memory
+
+// Only one food & one head glyph have to be loaded at a time.
+
+// Body - Body
+const uint8_t SYMBOL_BB[] PROGMEM = {_BODY_, _BODY_};
+
+// Body - None
+const uint8_t SYMBOL_BX[] PROGMEM = {_BODY_, _NONE_};
+const uint8_t SYMBOL_XB[] PROGMEM = {_NONE_, _BODY_};
+
+// Head - None
+const uint8_t SYMBOL_HX[] PROGMEM = {_HEAD_, _NONE_};
+const uint8_t SYMBOL_XH[] PROGMEM = {_NONE_, _HEAD_};
+
+// Body - Head
+const uint8_t SYMBOL_BH[] PROGMEM = {_BODY_, _HEAD_};
+const uint8_t SYMBOL_HB[] PROGMEM = {_HEAD_, _BODY_};
+
+// Head - Food
+const uint8_t SYMBOL_HF[] PROGMEM = {_HEAD_, _FOOD_};
+const uint8_t SYMBOL_FH[] PROGMEM = {_FOOD_, _HEAD_};
+
+// Food - None
+const uint8_t SYMBOL_FX[] PROGMEM = {_FOOD_, _NONE_};
+const uint8_t SYMBOL_XF[] PROGMEM = {_NONE_, _FOOD_};
+
+// Body - Food
+const uint8_t SYMBOL_BF[] PROGMEM = {_BODY_, _FOOD_};
+const uint8_t SYMBOL_FB[] PROGMEM = {_FOOD_, _BODY_};
+
+
+// board block (snake, food...)
+typedef enum {
+	bEMPTY = 0x00,
+	bHEAD = 0x01,
+	bFOOD = 0x02,
+	bBODY_LEFT = 0x80,
+	bBODY_RIGHT = 0x81,
+	bBODY_UP = 0x82,
+	bBODY_DOWN = 0x83,
+} block_t;
+
+// Snake direction
+typedef enum {
+	dLEFT = 0x00,
+	dRIGHT = 0x01,
+	dUP = 0x02,
+	dDOWN = 0x03,
+} dir_t;
+
+// Coordinate on board
+typedef struct {
+	int8_t x;
+	int8_t y;
+} coord_t;
+
+#define is_body(blk) (((blk) & 0x80) != 0)
+#define mk_body_dir(dir) (0x80 + (dir))
+
+// compare two coords
+#define coord_eq(a, b) (((a).x == (b).x) && ((a).y == (b).y))
+
+
+bool crashed;
+uint8_t snake_len;
+
+// y, x indexing
+block_t board[ROWS][COLS];
+
+coord_t head_pos;
+coord_t tail_pos;
+dir_t head_dir;
+
+const uint8_t CODE_BB = 0;
+const uint8_t CODE_BX = 1;
+const uint8_t CODE_XB = 2;
+const uint8_t CODE_H = 3;  // glyph with head, dynamic
+const uint8_t CODE_F = 4;  // glyph with food, dynamic
+const uint8_t CODE_XX = 32; // space
+
+
+// Set a block in board
+#define set_block_xy(x, y, block) do { board[y][x] = (block); } while(0)
+#define get_block_xy(x, y) board[y][x]
+#define get_block(pos) get_block_xy((pos).x, (pos).y)
+#define set_block(pos, block) set_block_xy((pos).x, (pos).y, (block))
+
+
+void init_cgram()
+{
+	// those will be always the same
+	lcd_define_glyph_pgm(CODE_BB, SYMBOL_BB);
+	lcd_define_glyph_pgm(CODE_BX, SYMBOL_BX);
+	lcd_define_glyph_pgm(CODE_XB, SYMBOL_XB);
+						lcd_define_glyph_pgm(5, SYMBOL_XF);
+}
+
+
+void place_food()
+{
+	while(1) {
+		const uint8_t xx = rand() % COLS;
+		const uint8_t yy = rand() % ROWS;
+
+		if (get_block_xy(xx, yy) == bEMPTY) {
+			set_block_xy(xx, yy, bFOOD);
+			break;
+		}
+	}
+}
+
+
+void init_gameboard()
+{
+	//erase the board
+	for (uint8_t x = 0; x < COLS; x++) {
+		for (uint8_t y = 0; y < ROWS; y++) {
+			set_block_xy(x, y, bEMPTY);
+		}
+	}
+
+	lcd_clear();
+
+	tail_pos = (coord_t) {.x = 0, .y = 0};
+
+	set_block_xy(0, 0, bBODY_RIGHT);
+	set_block_xy(1, 0, bBODY_RIGHT);
+	set_block_xy(2, 0, bBODY_RIGHT);
+	set_block_xy(3, 0, bHEAD);
+
+	head_pos = (coord_t) {.x = 3, .y = 0};
+
+	snake_len = 4; // includes head
+
+	head_dir = dRIGHT;
+	crashed = false;
+
+	place_food();
+}
+
+
+uint8_t presc = 0;
+
+bool restart_held;
+void update()
+{
+	if (debo_get_pin(D_RESTART)) {
+
+		if (!restart_held) {
+			// restart
+			init_gameboard();
+			presc = 0;
+			restart_held = true;
+		}
+
+	} else {
+		restart_held = false;
+	}
+
+	if(!crashed) {
+
+		// resolve movement direction
+		if (debo_get_pin(D_LEFT))
+			head_dir = dLEFT;
+		else if (debo_get_pin(D_RIGHT))
+			head_dir = dRIGHT;
+		else if (debo_get_pin(D_UP))
+			head_dir = dUP;
+		else if (debo_get_pin(D_DOWN))
+			head_dir = dDOWN;
+
+		// time's up for a move
+		if (presc++ == STEP_DELAY) {
+			presc = 0;
+
+			// move snake
+			const coord_t oldpos = head_pos;
+
+			switch (head_dir) {
+				case dLEFT:  head_pos.x--; break;
+				case dRIGHT: head_pos.x++; break;
+				case dUP:    head_pos.y--; break;
+				case dDOWN:  head_pos.y++; break;
+			}
+
+			bool do_move = false;
+			bool do_grow = false;
+
+			if (head_pos.x < 0 || head_pos.x >= COLS || head_pos.y < 0 || head_pos.y >= ROWS) {
+				// ouch, a wall!
+				crashed = true;
+			} else {
+				// check if tile occupied or not
+				if (coord_eq(head_pos, tail_pos)) {
+					// head moved in previous tail, that's OK.
+					do_move = true;
+				} else {
+					// moved to other tile than tail
+					switch (get_block(head_pos)) {
+
+						case bFOOD:
+							do_grow = true;  // fall through
+						case bEMPTY:
+							do_move = true;
+							break;
+
+						default: // includes all BODY_xxx
+							crashed = true;  // snake crashed into some block
+					}
+				}
+			}
+
+			if (do_move) {
+				// Move tail
+				if (do_grow) {
+					// let tail as is
+					snake_len++; // grow the counter
+				} else {
+					// tail dir
+					dir_t td = get_block(tail_pos) & 0xF;
+
+					// clean tail
+					set_block(tail_pos, bEMPTY);
+
+					// move tail based on old direction of tail block
+					switch (td) {
+						case dLEFT:  tail_pos.x--; break;
+						case dRIGHT: tail_pos.x++; break;
+						case dUP:    tail_pos.y--; break;
+						case dDOWN:  tail_pos.y++; break;
+					}
+				}
+
+				// Move head
+				set_block(head_pos, bHEAD);  // place head in new pos
+				set_block(oldpos, mk_body_dir(head_dir));  // directional body in old head pos
+
+				if (do_grow) {
+					// food eaten, place new
+					place_food();
+				}
+			}
+		}
+	} // end !crashed
+
+
+	// Render the board
+	for (uint8_t r = 0; r < ROWS / 2; r++)	{
+		lcd_xy(0, r);
+		for (uint8_t c = 0; c < COLS; c++)	{
+			const block_t t1 = get_block_xy(c, r * 2);
+			const block_t t2 = get_block_xy(c, (r * 2) + 1);
+
+			uint8_t code = '!';  // ! marks fail
+
+			if ((t1 == bEMPTY) && (t2 == bEMPTY)) {
+				code = CODE_XX;
+				if (crashed) code = '*';
+			} else if (is_body(t1) && is_body(t2))
+				code = CODE_BB;
+			else if (is_body(t1) && (t2 == bEMPTY))
+				code = CODE_BX;
+			else if (t1 == bEMPTY && is_body(t2))
+				code = CODE_XB;
+			else if ((t1 == bFOOD) || (t2 == bFOOD)) {
+				// one is food
+
+				code = CODE_F;
+
+				if (t1 == bFOOD) {
+					if (t2 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_FX);
+					else if (t2 == bHEAD)
+						lcd_define_glyph_pgm(code, SYMBOL_FH);
+					else if (is_body(t2))
+						lcd_define_glyph_pgm(code, SYMBOL_FB);
+				} else { // t2 is food
+					if (t1 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_XF);
+					else if (t1 == bHEAD)
+						lcd_define_glyph_pgm(code, SYMBOL_HF);
+					else if (is_body(t1))
+						lcd_define_glyph_pgm(code, SYMBOL_BF);
+				}
+				lcd_xy(c,r);
+
+			} else if ((t1 == bHEAD )|| (t2 == bHEAD)) {
+				// one is head
+
+				code = CODE_H;
+
+				if (t1 == bHEAD) {
+					if (t2 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_HX);
+					else if (is_body(t2))
+						lcd_define_glyph_pgm(code, SYMBOL_HB);
+				} else { // t2 is head
+					if (t1 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_XH);
+					else if (is_body(t1))
+						lcd_define_glyph_pgm(code, SYMBOL_BH);
+				}
+
+				lcd_xy(c,r);
+			}
+
+			lcd_char(code);
+		}
+	}
+}
+
+void main() { while(1); } // timer does everything
diff --git a/projects/lcdsnake/Makefile b/projects/lcdsnake/Makefile
new file mode 100644
index 0000000..75b611d
--- /dev/null
+++ b/projects/lcdsnake/Makefile
@@ -0,0 +1,166 @@
+
+MCU	= atmega328p
+
+F_CPU = 16000000
+
+LFUSE = 0xFF
+HFUSE = 0xDE
+EFUSE = 0x05
+
+MAIN = main.c
+
+## If you've split your program into multiple files,
+## include the additional .c source (in same directory) here
+## (and include the .h files in your foo.c)
+LOCAL_SOURCE =
+
+## Here you can link to one more directory (and multiple .c files)
+# EXTRA_SOURCE_DIR = ../AVR-Programming-Library/
+EXTRA_SOURCE_DIR =
+EXTRA_SOURCE_FILES =
+
+
+
+##########------------------------------------------------------##########
+##########                 Programmer Defaults                  ##########
+##########          Set up once, then forget about it           ##########
+##########        (Can override.  See bottom of file.)          ##########
+##########------------------------------------------------------##########
+#19200
+PROGRAMMER_TYPE = arduino
+PROGRAMMER_ARGS = -b 57600 -P /dev/ttyUSB0
+
+
+##########------------------------------------------------------##########
+##########                   Makefile Magic!                    ##########
+##########         Summary:                                     ##########
+##########             We want a .hex file                      ##########
+##########        Compile source files into .elf                ##########
+##########        Convert .elf file into .hex                   ##########
+##########        You shouldn't need to edit below.             ##########
+##########------------------------------------------------------##########
+
+## Defined programs / locations
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+AVRSIZE = avr-size
+AVRDUDE = sudo avrdude
+
+## Compilation options, type man avr-gcc if you're curious.
+CFLAGS = -std=gnu99 -mmcu=$(MCU) -DF_CPU=$(F_CPU)UL -I. -I$(EXTRA_SOURCE_DIR)
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -Wall -Wno-main -Wno-strict-prototypes -Wno-comment
+CFLAGS += -g2 -Wextra -Wfatal-errors
+CFLAGS += -ffunction-sections -fdata-sections -Wl,--gc-sections -Wl,--relax
+
+CFLAGS_BUILD = $(CFLAGS) -Os
+
+# CFLAGS += -lm
+## CFLAGS += -Wl,-u,vfprintf -lprintf_flt -lm  ## for floating-point printf
+## CFLAGS += -Wl,-u,vfprintf -lprintf_min      ## for smaller printf
+
+## Lump target and extra source files together
+TARGET = $(strip $(basename $(MAIN)))
+SRC1 = $(TARGET).c
+SRC = $(SRC1)
+EXTRA_SOURCE = $(addprefix $(EXTRA_SOURCE_DIR), $(EXTRA_SOURCE_FILES))
+SRC += $(EXTRA_SOURCE)
+SRC += $(LOCAL_SOURCE)
+
+## List of all header files
+HEADERS = $(SRC:.c=.h)
+
+## For every .c file, compile an .o object file
+OBJ = $(SRC:.c=.o)
+
+## Generic Makefile targets.  (Only .hex file is necessary)
+all: $(TARGET).hex size
+pre: $(TARGET).pre
+
+%.hex: %.elf
+	$(OBJCOPY) -R .eeprom -O ihex $< $@
+
+%.elf: $(SRC)
+	$(CC) $(CFLAGS_BUILD) $(SRC) --output $@
+
+%.pre: $(SRC1)
+	$(CC) $(CFLAGS) -E $(SRC1) --output $@
+
+%.eeprom: %.elf
+	$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
+
+debug:
+	@echo
+	@echo "Source files:"   $(SRC)
+	@echo "MCU, F_CPU, BAUD:"  $(MCU), $(F_CPU), $(BAUD)
+	@echo
+
+# Optionally create listing file from .elf
+# This creates approximate assembly-language equivalent of your code.
+# Useful for debugging time-sensitive bits,
+# or making sure the compiler does what you want.
+disassemble: $(TARGET).lst
+
+dis: disassemble
+lst: disassemble
+
+eeprom: $(TARGET).eeprom
+
+%.lst: %.elf
+	$(OBJDUMP) -S $< > $@
+
+# Optionally show how big the resulting program is
+size:  $(TARGET).elf
+	$(AVRSIZE) -C --mcu=$(MCU) $(TARGET).elf
+
+clean:
+	rm -f $(TARGET).elf $(TARGET).hex $(TARGET).obj \
+	$(TARGET).o $(TARGET).d $(TARGET).eep $(TARGET).lst \
+	$(TARGET).lss $(TARGET).sym $(TARGET).map $(TARGET)~ \
+	$(TARGET).eeprom
+
+squeaky_clean:
+	rm -f *.elf *.hex *.obj *.o *.d *.eep *.lst *.lss *.sym *.map *~
+
+
+##########------------------------------------------------------##########
+##########              Programmer-specific details             ##########
+##########           Flashing code to AVR using avrdude         ##########
+##########------------------------------------------------------##########
+
+flash: $(TARGET).hex
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U flash:w:$<
+
+flash_eeprom: $(TARGET).eeprom
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U eeprom:w:$<
+
+terminal:
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nt
+
+
+flash_arduino: PROGRAMMER_TYPE = arduino
+flash_arduino: PROGRAMMER_ARGS =
+flash_arduino: flash
+
+flash_dragon_isp: PROGRAMMER_TYPE = dragon_isp
+flash_dragon_isp: PROGRAMMER_ARGS =
+flash_dragon_isp: flash
+
+
+##########------------------------------------------------------##########
+##########       Fuse settings and suitable defaults            ##########
+##########------------------------------------------------------##########
+
+## Generic
+FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
+
+fuses:
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) \
+	           $(PROGRAMMER_ARGS) $(FUSE_STRING)
+show_fuses:
+	$(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nv
+
+## Called with no extra definitions, sets to defaults
+set_default_fuses:  FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
+set_default_fuses:  fuses
diff --git a/projects/lcdsnake/README.md b/projects/lcdsnake/README.md
new file mode 100644
index 0000000..10be780
--- /dev/null
+++ b/projects/lcdsnake/README.md
@@ -0,0 +1,10 @@
+Snake for HD44780
+=================
+
+This is a Snake game (known from old Nokia phones) played on a character display with HD44780.
+
+Program tested on Arduino Pro Mini (flashed with avrdude using the Makefile).
+
+**Connections** are `#define`d in `main.c`, board size and snake speed can also be adjusted. No external parts except the display and buttons required.
+
+Best works with a gamepad, but any buttons will work.
diff --git a/projects/lcdsnake/lcd_default.asm b/projects/lcdsnake/lcd_default.asm
new file mode 100644
index 0000000..c092f27
--- /dev/null
+++ b/projects/lcdsnake/lcd_default.asm
@@ -0,0 +1,351 @@
+; Zapojeni (Připojen DMC-50399 v 4-bitovem modu):
+;                   +------u------+
+;    Vcc -> reset --+ /RST    Vcc +-- napajeni +5V
+;                 --+ PD0     PB7 +-- RS (0=instr W, BF+addr R; 1=data W/R)
+;                 --+ PD1     PB6 +-- R/W (1=read,0=write)
+;                 --+ PA1     PB5 +-- E (clock, active falling edge)
+;                 --+ PA0     PB4 +-- 
+;                 --+ PD2     PB3 +-- DATA 7
+;                 --+ PD3     PB2 +-- DATA 6
+;                 --+ PD4     PB1 +-- DATA 5
+;                 --+ PD5     PB0 +-- DATA 4
+;             GND --+ GND     PD6 +-- 
+;                   +-------------+
+
+;DMC-50399: 
+; 1 - GND
+; 2 - +5V
+; 3 - 0V (lcd driver)
+; 4 - RS
+; 5 - R/W
+; 6 - E
+; 7 - DATA 0
+; 8 - DATA 1
+;...
+;14 - DATA 7
+
+.device attiny2313
+;běží na 4MHz, ckdiv8=1 (vypnuto)
+;250x16=1ms=1000us
+
+;LFUSE: 0xE2 -U lfuse:w:0xE2:m
+;HFUSE: 0xDF -U hfuse:w:0xDF:m
+
+
+;K O N S T A N T Y   +   P R E Z D I V K Y   P O R T U   A   P I N U
+.equ LCDPORT = PORTB
+.equ LCDPIN = PINB
+.equ LCDDDR = DDRB
+
+.equ RS = 7
+.equ RW = 6
+.equ E = 5
+
+.equ LCD_CLEAR = 0b00000001
+.equ LCD_HOME = 0b00000010
+
+.equ LCD_MODE_INC_NOSHIFT = 0b00000110
+.equ LCD_MODE_INC_SHIFT = 0b00000111
+.equ LCD_MODE_DEC_NOSHIFT = 0b00000100
+.equ LCD_MODE_DEC_SHIFT = 0b00000101
+
+.equ LCD_DISPLAY_DISABLED = 0b00001000
+.equ LCD_DISPLAY_NOCURSOR = 0b00001100
+.equ LCD_DISPLAY_CURSOR = 0b00001110
+.equ LCD_DISPLAY_ALTER = 0b00001101
+.equ LCD_DISPLAY_CURSOR_ALTER = 0b00001111
+
+.equ LCD_CURSOR_LEFT = 0b00010000
+.equ LCD_CURSOR_RIGHT = 0b00010100
+.equ LCD_SHIFT_LEFT = 0b00011000
+.equ LCD_SHIFT_RIGHT = 0b00011100
+
+
+;5x7 font, 1-line
+.equ LCD_MODE_4BIT_1LINE = 0b00100000
+;.equ LCD_MODE_8BIT_1LINE = 0b00110000
+;5x7 font, 2-line
+.equ LCD_MODE_4BIT_2LINE = 0b00101000
+;.equ LCD_MODE_8BIT_2LINE = 0b00111000
+
+.equ ROW1_ADDR = 0x00
+.equ ROW2_ADDR = 0x40
+.equ ROW3_ADDR = 0x14
+.equ ROW4_ADDR = 0x54
+
+
+
+;aliases
+.def 	ZH		= r31
+.def 	ZL		= r30
+.def 	YH		= r29
+.def 	YL		= r28
+.def 	XH		= r27
+.def 	XL		= r26
+
+; Z A C A T E K   P R O G R A M U
+;vektory preruseni
+.org	0x0000				;RESET
+	rjmp RESET			;skok na start po resetu
+
+.org	0x0013
+
+;nastaveni po resetu
+.DB	"HD44780 INTERFACE"		;(nazev programu)
+RESET:
+	ldi r16,low(RAMEND)		;nastavi stack pointer
+	out SPL,r16
+	cli				;zakazat vsechna preruseni
+
+; Nastaveni portu
+	;PORTB = LCDPORT
+	ldi r16,0b11111111		;smer portu B
+	out LCDDDR,r16
+	ldi r16,0b00000000		;vypnout B
+	out LCDPORT,r16
+	
+	sei				;Global Interrupt Enable
+
+; == display init ==
+	rcall LCD_INIT
+
+	ldi r17,LCD_MODE_INC_NOSHIFT
+	rcall TX_INSTR
+
+	ldi r17,LCD_DISPLAY_NOCURSOR
+	rcall TX_INSTR
+
+; == load user-defined characters to CGRAM == (default, array label named MYCHARS, end-mark=0xFE)
+	ldi r17,0
+	rcall CGRAM_SET_ADDR
+
+	ldi ZH,high(MYCHARS*2)
+	ldi ZL,low(MYCHARS*2)
+CGRAM_loop:
+	lpm r17,Z+
+	cpi r17,0xFE
+	breq CGRAM_loop_end
+	rcall TX_DATA
+	rjmp CGRAM_loop
+CGRAM_loop_end:
+
+
+; == pgm body ==
+
+;load text to DDRAM
+	ldi r17,ROW1_ADDR
+	rcall DDRAM_SET_ADDR
+
+	ldi ZH,high(MYTEXT1*2)
+	ldi ZL,low(MYTEXT1*2)
+DDRAM_loop:
+	lpm r17,Z+
+	cpi r17,0xFE
+	breq DDRAM_loop_end
+	rcall TX_DATA
+	rjmp DDRAM_loop
+DDRAM_loop_end:
+
+;load text to DDRAM
+	ldi r17,ROW2_ADDR
+	rcall DDRAM_SET_ADDR
+
+	ldi ZH,high(MYTEXT2*2)
+	ldi ZL,low(MYTEXT2*2)
+DDRAM2_loop:
+	lpm r17,Z+
+	cpi r17,0xFE
+	breq DDRAM2_loop_end
+	rcall TX_DATA
+	rjmp DDRAM2_loop
+DDRAM2_loop_end:
+
+;direct write to X,Y - example
+	ldi r16,3	;Y, zacina 0 a roste smerem dolu
+	ldi r17,5	;X, zacina nulou a roste smerem doprava
+	rcall LCD_CURSOR_XY
+	ldi r17,"%"
+	rcall TX_DATA
+	ldi r17,"%"
+	rcall TX_DATA
+	ldi r17,"%"
+	rcall TX_DATA
+;infinite loop
+loop:	rjmp loop
+
+
+MYTEXT1:
+.DB	0,0,0," POKUSNY TEXT ",0,0,0,0xFE
+MYTEXT2:
+.DB	"Opravdu pekny text!",0xFE
+
+
+
+; == USER-DEFINED CHARS ==
+MYCHARS:
+; 5x8, first 3 bits are not used
+;end of mychars
+.DB	0xe,0x1f,0x15,0x1f,0x1f,0x1f,0x15	;smajlik
+
+;konec
+.DB	0xFE
+
+
+
+
+
+;r16=Y
+;r17=X
+LCD_CURSOR_XY:
+	cpi r16,0
+	brne test1
+fail:	ldi r16,ROW1_ADDR
+	rjmp addrdone
+test1:
+	cpi r16,1
+	brne test2
+	ldi r16,ROW2_ADDR
+	rjmp addrdone
+test2:
+	cpi r16,2
+	brne test3
+	ldi r16,ROW3_ADDR
+	rjmp addrdone
+test3:
+	cpi r16,3
+	brne fail
+	ldi r16,ROW4_ADDR
+addrdone:
+	add r17,r16
+	rcall DDRAM_SET_ADDR
+	ret
+
+;r16=počet ms (cca)
+delay:
+	push r17	;2
+	push r18	;2
+d1:
+	ldi r17,250	;1
+d2:
+	ldi r18,14	;1
+d3:
+	dec r18		;1
+	nop
+	brne d3		;2 (1
+	dec r17		;   +1)
+	brne d2		;2 (1
+	dec r16		;   +1)
+	brne d1		;2 (1)
+	
+	pop r18		;2
+	pop r17		;2
+	ret
+
+
+LCD_INIT:
+	ldi r16,16
+	rcall delay
+	ldi r16,0b00000010		;4bit
+	out PORTB,r16
+	rcall LCD_CLK
+	ldi r16,5
+	rcall delay
+	ldi r17,LCD_MODE_4BIT_2LINE		;set 4-bit mode
+	rcall TX_INSTR
+	ret
+
+;r17
+TX_INSTR:
+	swap r17			;send high nibble
+	mov r16,r17
+	andi r16,0b00001111
+	out LCDPORT,r16
+	rcall LCD_CLK
+
+	swap r17			;send low nibble
+	mov r16,r17
+	andi r16,0b00001111
+	out LCDPORT,r16
+	rcall LCD_CLK
+
+	ret
+
+;r17
+TX_DATA:
+	swap r17			;send high nibble
+	mov r16,r17
+	andi r16,0b00001111
+	sbr r16,(1<<RS)
+	out LCDPORT,r16
+	rcall LCD_CLK
+
+	swap r17			;send low nibble
+	mov r16,r17
+	andi r16,0b00001111
+	sbr r16,(1<<RS)
+	out LCDPORT,r16
+	rcall LCD_CLK
+
+	ret
+
+;r17 disabled to reduce code size
+;RX_DATA:
+;	;input
+;	ldi r16,0b11110000		;LCDPORT dirrection (RS RW E n.c.) output, (D7 D6 D5 D4) input
+;	out LCDDDR,r16
+;	ldi r16,0b00001111		;pullups to data pins enabled
+;	out LCDPORT,r16
+;
+;	clr r17
+;	ldi r16,(1<<RW)|(1<<RS)
+;	out LCDPORT,r16			;set LCD to read mode, for data
+;
+;	rcall LCD_CLK			;receive high nibble
+;	in r16,LCDPIN
+;	andi r16,0b00001111
+;	or r17,r16
+;	swap r17			;store high nibble
+;
+;	rcall LCD_CLK			;receive low nibble
+;	in r16,LCDPIN
+;	andi r16,0b00001111
+;	or r17,r16			;store low nibble
+;	
+;	;output
+;	ldi r16,0b11111111		;LCDPORT as output (RS RW E n.c. D7 D6 D5 D4)
+;	out LCDDDR,r16
+;	ldi r16,0b00000000		;LCDPORT off
+;	out LCDPORT,r16
+;	
+;	;r17=received value (D7 D6 D5 D4 D3 D2 D1 D0)
+;	ret
+
+LCD_CLK:
+	sbi LCDPORT,E			;EXECUTE on
+	nop
+	nop
+	nop
+	cbi LCDPORT,E			;EXECUTE off
+	ldi r16,150			;pause: 100 for 4MHZ
+clkw:
+	dec r16
+	brne clkw
+	ret
+
+;r17
+;7 bitu (1.radek zacina 00,druhej 40)
+DDRAM_SET_ADDR:
+	clr r16
+	sbr r16,0b10000000
+	or r17,r16
+	rcall TX_INSTR
+	ret
+
+;r17
+;6 bitu (5,4,3 = znak, 2,1,0 = radek - shora)
+CGRAM_SET_ADDR:
+	clr r16
+	sbr r16,0b01000000
+	or r17,r16
+	rcall TX_INSTR
+	ret
\ No newline at end of file
diff --git a/projects/lcdsnake/lib/README.md b/projects/lcdsnake/lib/README.md
new file mode 100644
index 0000000..7ac9922
--- /dev/null
+++ b/projects/lcdsnake/lib/README.md
@@ -0,0 +1,8 @@
+AVR utils library
+=================
+
+This is my ever-evolving library (not only) for AVR programming.
+
+When I'm done with a project, I copy the current library to the project, so it doesn't break when I do further improvements.
+
+Each library file contains a large comment block explaining it's function.
diff --git a/projects/lcdsnake/lib/adc.h b/projects/lcdsnake/lib/adc.h
new file mode 100644
index 0000000..41e855c
--- /dev/null
+++ b/projects/lcdsnake/lib/adc.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <avr/io.h>
+#include <stdbool.h>
+#include "calc.h"
+
+/** Initialize the ADC */
+void adc_init()
+{
+	ADCSRA |= _BV(ADPS2) | _BV(ADPS1) | _BV(ADPS0);  // 128 prescaler -> 125 kHz
+	ADMUX  |= _BV(REFS0);  // Voltage reference
+	sbi(ADCSRA, ADEN);  // Enable ADC
+}
+
+
+/** Sample analog pin with 8-bit precision */
+uint8_t adc_read_byte(uint8_t channel)
+{
+	write_low_nibble(ADMUX, channel);  // Select channel to sample
+	sbi(ADMUX, ADLAR);  // Align result to left
+	sbi(ADCSRA, ADSC);  // Start conversion
+
+	while(bit_is_high(ADCSRA, ADSC));  // Wait for it...
+
+	return ADCH;  // The upper 8 bits of ADC result
+}
+
+
+/** Sample analog pin with 10-bit precision */
+uint16_t adc_read_word(uint8_t channel)
+{
+	write_low_nibble(ADMUX, channel);  // Select channel to sample
+	cbi(ADMUX, ADLAR);  // Align result to right
+	sbi(ADCSRA, ADSC);  // Start conversion
+
+	while(get_bit(ADCSRA, ADSC));  // Wait for it...
+
+	return ADCW;  // The whole ADC word (10 bits)
+}
diff --git a/projects/lcdsnake/lib/arduino_pins.h b/projects/lcdsnake/lib/arduino_pins.h
new file mode 100644
index 0000000..ca4f4c6
--- /dev/null
+++ b/projects/lcdsnake/lib/arduino_pins.h
@@ -0,0 +1,42 @@
+#pragma once
+
+/**
+  Pin definitions for Arduino (Pro Mini with ATmega328P)
+*/
+
+#include "pins.h"
+
+#define D0 D,0
+#define D1 D,1
+#define D2 D,2
+#define D3 D,3
+#define D4 D,4
+#define D5 D,5
+#define D6 D,6
+#define D7 D,7
+#define D8 B,0
+#define D9 B,1
+#define D10 B,2
+
+// MOSI MISO SCK - not good for input
+#define D11 B,3
+#define D12 B,4
+#define D13 B,5
+
+#define D14 C,0
+#define D15 C,1
+#define D16 C,2
+#define D17 C,3
+#define D18 C,4
+#define D19 C,5
+#define D20 C,6
+#define D21 C,7
+
+#define A0 C,0
+#define A1 C,1
+#define A2 C,2
+#define A3 C,3
+#define A4 C,4
+#define A5 C,5
+#define A6 C,6
+#define A7 C,7
diff --git a/projects/lcdsnake/lib/calc.h b/projects/lcdsnake/lib/calc.h
new file mode 100644
index 0000000..750e173
--- /dev/null
+++ b/projects/lcdsnake/lib/calc.h
@@ -0,0 +1,89 @@
+#pragma once
+
+/**
+  Bit and byte manipulation utilities
+*/
+
+
+// --- Increment in range ---
+// when overflown, wraps within range. Lower bound < upper bound.
+// ..., upper bound excluded
+#define inc_wrap(var, min, max)  do { if ((var) >= (max - 1)) { (var) = (min); } else { (var)++; } } while(0)
+// ..., upper bound included
+#define inc_wrapi(var, min, max) inc_wrap((var), (min), (max) + 1)
+
+
+// --- Decrement in range ---
+// when underflown, wraps within range. Lower bound < upper bound.
+// ..., upper bound excluded
+#define dec_wrap(var, min, max)  do { if ((var) <= (min)) { (var) = (max) - 1; } else { (var)--; } } while(0)
+// ..., upper bound included
+#define dec_wrapi(var, min, max) dec_wrap((var), (min), (max) + 1)
+
+
+// --- Bit manipulation --
+
+// Set bit
+#define sbi(reg, bit) do { (reg) |=  (1 << (uint8_t)(bit)); } while(0)
+
+// Clear bit
+#define cbi(reg, bit) do { (reg) &= ~(1 << (uint8_t)(bit)); } while(0)
+
+// Get n-th bit
+#define read_bit(reg, bit) (((reg) >> (uint8_t)(bit)) & 0x1)
+#define get_bit(reg, bit)  read_bit(reg, bit)
+
+// Test n-th bit (Can't use bit_is_set, as it's redefined in sfr_def.h)
+#define bit_is_high(reg, bit) read_bit(reg, bit)
+#define bit_is_low(reg, bit)  (!read_bit(reg, bit))
+
+// Write value to n-th bit
+#define write_bit(reg, bit, value) do { (reg) = ((reg) & ~(1 << (uint8_t)(bit))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
+#define set_bit(reg, bit, value)   write_bit(reg, bit, value)
+
+// Invert n-th bit
+#define toggle_bit(reg, bit)       do { (reg) ^= (1 << (uint8_t)(bit)); } while(0)
+
+
+// --- Bit manipulation with pointer to variable ---
+
+// Set n-th bit in pointee
+#define sbi_p(reg_p, bit) do { (*(reg_p)) |=  (1 << (uint8_t)(bit)); } while(0)
+// Clear n-th bit in pointee
+#define cbi_p(reg_p, bit) do { (*(reg_p)) &= ~(1 << (uint8_t)(bit)); } while(0)
+
+// Get n-th bit in pointee
+#define read_bit_p(reg_p, bit) ((*(reg_p) >> (uint8_t)(bit)) & 0x1)
+#define get_bit_p(reg_p, bit)  read_bit_p(reg_p, bit)
+
+// Test n-th bit in pointee (Can't use bit_is_set, as it's redefined in sfr_def.h)
+#define bit_is_high_p(reg_p, bit) read_bit_p(reg_p, bit)
+#define bit_is_low_p(reg_p, bit)  (!read_bit_p(reg_p, bit))
+
+// Write value to a bit in pointee
+#define write_bit_p(reg_p, bit, value) do { *(reg_p) = (*(reg_p) & ~(1 << ((uint8_t)(bit) & 0x1))) | (((uint8_t)(value) & 0x1) << (uint8_t)(bit)); } while(0)
+#define set_bit_p(reg_p, bit, value)     write_bit_p(reg_p, bit, value)
+#define toggle_bit_p(reg_p, bit)       do { *(reg_p) ^= (1 << (uint8_t)(bit)); } while(0)
+
+
+// --- Nibble manipulation ---
+
+// Replace nibble in a byte
+#define write_low_nibble(reg, value)  do { (reg) = ((reg) & 0xF0) | ((uint8_t)(value) & 0xF); } while(0)
+#define write_high_nibble(reg, value) do { (reg) = ((reg) & 0x0F) | (((uint8_t)(value) & 0xF) << 4); } while(0)
+
+#define write_low_nibble_p(reg_p, value)  do { *(reg_p) = (*(reg_p) & 0xF0) | ((uint8_t)(value) & 0xF); } while(0)
+#define write_high_nibble_p(reg_p, value) do { *(reg_p) = (*(reg_p) & 0x0F) | (((uint8_t)(value) & 0xF) << 4); } while(0)
+
+
+// --- Range tests ---
+
+// Test if X is within low..high, regardless of bounds order
+#define in_range(x, low, high)  ((((low)  < (high)) && ((x) >= (low) && (x)  < (high))) || (((low) > (high)) && ((x) >= (high) && (x)  < (low))))
+// ..., include greater bound
+#define in_rangei(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (high) && (x) <= (low))))
+
+// Test if X in low..high, wrap around ends if needed.
+#define in_range_wrap(x, low, high)  ((((low)  < (high)) && ((x) >= (low) && (x) < (high)))  || (((low) > (high)) && ((x) >= (low) || (x)  < (high))))
+// ..., include upper bound
+#define in_range_wrapi(x, low, high) ((((low) <= (high)) && ((x) >= (low) && (x) <= (high))) || (((low) > (high)) && ((x) >= (low) || (x) <= (high))))
diff --git a/projects/lcdsnake/lib/colors.h b/projects/lcdsnake/lib/colors.h
new file mode 100644
index 0000000..9b45110
--- /dev/null
+++ b/projects/lcdsnake/lib/colors.h
@@ -0,0 +1,83 @@
+#pragma once
+
+/*
+  Some useful utilities for RGB color manipulation
+
+  The XXXc macros don't use cast, so they can be used in array initializers.
+
+  xrgb ... 3-byte true-color RGB (8 bits per component)
+  rgbXX ... XX-bit color value, with equal nr of bits per component
+
+  XX_r (_g, _b) ... extract component from the color, and convert it to 0..255
+*/
+
+typedef struct {
+	uint8_t r;
+	uint8_t g;
+	uint8_t b;
+} xrgb_t;
+
+typedef uint32_t rgb24_t;
+typedef uint16_t rgb16_t;
+typedef uint16_t rgb12_t;
+typedef uint8_t rgb6_t;
+
+
+#define xrgb(rr, gg, bb) ((xrgb_t)xrgbc(rr, gg, bb))
+// xrgb for constant array declarations
+#define xrgbc(rr, gg, bb) { .r = ((uint8_t)(rr)), .g = ((uint8_t)(gg)), .b = ((uint8_t)(bb)) }
+#define xrgb_r(c) ((uint8_t)(c.r))
+#define xrgb_g(c) ((uint8_t)(c.g))
+#define xrgb_b(c) ((uint8_t)(c.b))
+#define xrgb_rgb24(c) ((((rgb24_t)c.r) << 16) | (((rgb24_t)c.g) << 8) | (((rgb24_t)c.b)))
+#define xrgb_rgb15(c) (((((rgb15_t)c.r) & 0xF8) << 7) | ((((rgb15_t)c.g) & 0xF8) << 2) | ((((rgb15_t)c.b) & 0xF8) >> 3))
+#define xrgb_rgb12(c) (((((rgb12_t)c.r) & 0xF0) << 4) | ((((rgb12_t)c.g) & 0xF0)) | ((((rgb12_t)c.b) & 0xF0) >> 4))
+#define xrgb_rgb6(c)  (((((rgb6_t)c.r) & 0xC0) >> 2)  | ((((rgb6_t)c.g) & 0xC0) >> 4) | ((((rgb6_t)c.b) & 0xC0) >> 6))
+
+
+#define rgb24c(r,g,b) (((((rgb24_t)r) & 0xFF) << 16) | ((((rgb24_t)g) & 0xFF) << 8) | (((rgb24_t)b) & 0xFF))
+#define rgb24(r,g,b) ((rgb24_t) rgb24(r,g,b))
+
+#define rgb24_r(c) ((((rgb24_t) (c)) >> 16) & 0xFF)
+#define rgb24_g(c) ((((rgb24_t) (c)) >> 8) & 0xFF)
+#define rgb24_b(c) ((((rgb24_t) (c)) >> 0) & 0xFF)
+#define rgb24_xrgb(c) xrgb(rgb24_r(c), rgb24_g(c), rgb24_b(c))
+#define rgb24_xrgbc(c) xrgbc(rgb24_r(c), rgb24_g(c), rgb24_b(c))
+
+
+#define rgb15(r,g,b) ((rgb16_t) rgb15c(r,g,b))
+#define rgb15c(r,g,b) (((r & 0x1F) << 10) | ((g & 0x1F) << 5) | (b & 0x1F))
+
+#define rgb15_r(c) ((((rgb15_t) (c)) & 0x7C00) >> 7)
+#define rgb15_g(c) ((((rgb15_t) (c)) & 0x3E0) >> 2)
+#define rgb15_b(c) ((((rgb15_t) (c)) & 0x1F) << 3)
+#define rgb15_xrgb(c)  xrgb(rgb15_r(c), rgb15_g(c), rgb15_b(c))
+#define rgb15_rgb24(c) rgb24(rgb15_r(c), rgb15_g(c), rgb15_b(c))
+#define rgb15_rgb24c(c) rgb24c(rgb15_r(c), rgb15_g(c), rgb15_b(c))
+
+
+#define rgb12(r,g,b) ((rgb12_t) rgb12c(r,g,b))
+#define rgb12c(r,g,b) (((r & 0xF) << 8) | ((g & 0xF) << 4) | (b & 0xF))
+
+#define rgb12_r(c) ((((rgb12_t) (c)) & 0xF00) >> 4)
+#define rgb12_g(c) (((rgb12_t) (c)) & 0xF0)
+#define rgb12_b(c) (((r(rgb12_t) (c)gb) & 0x0F) << 4)
+#define rgb12_xrgb(c)  xrgb(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+#define rgb12_xrgbc(c)  xrgbc(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+#define rgb12_rgb24(c) rgb24(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+#define rgb12_rgb24c(c) rgb24c(rgb12_r(c), rgb12_g(c), rgb12_b(c))
+
+
+#define rgb6(r,g,b) ((rgb6_t) rgb6c(r,g,b))
+#define rgb6c(r,g,b) (((r & 3) << 4) | ((g & 3) << 2) | (b & 3))
+
+#define rgb6_r(c) ((((rgb6_t) (c)) & 0x30) << 2)
+#define rgb6_g(c) ((((rgb6_t) (c)) & 0xC) << 4)
+#define rgb6_b(c) ((((rgb6_t) (c)) & 0x3) << 6)
+#define rgb6_xrgb(c)  xrgb(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+#define rgb6_xrgbc(c)  xrgbc(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+#define rgb6_rgb24(c) rgb24(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+#define rgb6_rgb24c(c) rgb24c(rgb6_r(c), rgb6_g(c), rgb6_b(c))
+
+
+#define add_xrgb(x, y) ((xrgb_t) { (((y).r > (255 - (x).r)) ? 255 : ((x).r + (y).r)), (((y).g > (255 - (x).g)) ? 255 : ((x).g + (y).g)), (((y).b > 255 - (x).b) ? 255 : ((x).b + (y).b)) })
diff --git a/projects/lcdsnake/lib/debounce.h b/projects/lcdsnake/lib/debounce.h
new file mode 100644
index 0000000..00c0587
--- /dev/null
+++ b/projects/lcdsnake/lib/debounce.h
@@ -0,0 +1,103 @@
+#pragma once
+
+/**
+  An implementation of button debouncer.
+
+  First, the system must be initialized - even before including:
+
+      #define DEBO_CHANNELS 2
+      #define DEBO_TICKS 5
+
+      #inclue "lib/debounce.h"
+
+  A pin is registered like this:
+
+      #define BTN1 B,0
+      #define BTN2 B,1
+
+      debo_add(BTN0);  // The function returns number assigned to the pin (0, 1, ...)
+      debo_add_rev(BTN1);  // active low
+      debo_register(&PINB, PB2, 0);  // direct access - register, pin & invert
+
+  Then periodically call the tick function (perhaps in a timer interrupt):
+
+      debo_tick();
+
+  To check if input is active, use
+
+      debo_get_pin(0); // state of input registered as #0
+      debo_get_pin(1); // state of input registered as #1
+*/
+
+#include <avr/io.h>
+#include <stdbool.h>
+
+#include "calc.h"
+#include "pins.h"
+
+
+// Number of pins to debounce
+#ifndef DEBO_CHANNELS
+# error "DEBO_CHANNELS not defined!"
+#endif
+
+#ifndef DEBO_TICKS
+# warning "DEBO_TICKS not defined, defaulting to 5!"
+# define DEBO_TICKS 5
+#endif
+
+
+/* Internal deboucer entry */
+typedef struct {
+	PORT_P reg;    // pointer to IO register
+	uint8_t bit;   // bits 6 and 7 of this hold "state" & "invert" flag
+	uint8_t count; // number of ticks this was in the new state
+} debo_slot_t;
+
+/** Debounce data array */
+debo_slot_t debo_slots[DEBO_CHANNELS];
+uint8_t debo_next_slot = 0;
+
+/** Define a debounced pin (must be IO!) */
+
+#define debo_add_rev(io) debo_register(&io2pin(io_pack(io)), io2n(io_pack(io)), 1)
+#define debo_add(io)  debo_register(&io2pin(io_pack(io)), io2n(io_pack(io)), 0)
+
+uint8_t debo_register(PORT_P reg, uint8_t bit, bool invert)
+{
+	debo_slots[debo_next_slot] = (debo_slot_t){
+		.reg = reg,
+		.bit = bit | ((invert & 1) << 7) | (get_bit_p(reg, bit) << 6), // bit 7 = invert, bit 6 = state
+		.count = 0,
+	};
+
+	return debo_next_slot++;
+}
+
+
+/** Check debounced pins, should be called periodically. */
+void debo_tick()
+{
+	for (uint8_t i = 0; i < debo_next_slot; i++) {
+		// current pin value (right 3 bits, xored with inverse bit)
+		bool value = get_bit_p(debo_slots[i].reg, debo_slots[i].bit & 0x7);
+
+		if (value != get_bit(debo_slots[i].bit, 6)) {
+
+			// different pin state than last recorded state
+			if (debo_slots[i].count < DEBO_TICKS) {
+				debo_slots[i].count++;
+			} else {
+				// overflown -> latch value
+				set_bit(debo_slots[i].bit, 6, value); // set state bit
+				debo_slots[i].count = 0;
+			}
+		} else {
+			debo_slots[i].count = 0; // reset the counter
+		}
+	}
+}
+
+
+/** Get a value of debounced pin */
+#define debo_get_pin(i) (get_bit(debo_slots[i].bit, 6) ^ get_bit(debo_slots[i].bit, 7))
diff --git a/projects/lcdsnake/lib/lcd.h b/projects/lcdsnake/lib/lcd.h
new file mode 100644
index 0000000..8c45f85
--- /dev/null
+++ b/projects/lcdsnake/lib/lcd.h
@@ -0,0 +1,391 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+
+#include "calc.h"
+#include "pins.h"
+#include "nsdelay.h"
+
+/*
+  HD44780 LCD display driver - 4-bit mode
+
+  Required macros - pin settings (eg. B,3 or D,0)
+
+      LCD_PIN_RS
+      LCD_PIN_RW
+      LCD_PIN_E
+      LCD_PIN_D7
+      LCD_PIN_D6
+      LCD_PIN_D5
+      LCD_PIN_D4
+
+  Define those before including the header file.
+*/
+
+// Commands for user
+
+// Clear screen (reset)
+#define LCD_CLEAR 0b00000001
+// Move cursor to (0,0), unshift...
+#define LCD_HOME  0b00000010
+
+// Set mode: Increment + NoShift
+#define LCD_MODE_INC         0b00000110
+// Set mode: Increment + Shift
+#define LCD_MODE_INC_SHIFT   0b00000111
+
+// Set mode: Decrement + NoShift
+#define LCD_MODE_DEC         0b00000100
+// Set mode: Decrement + Shift
+#define LCD_MODE_DEC_SHIFT   0b00000101
+
+// Disable display (data remains untouched)
+#define LCD_DISABLE          0b00001000
+
+// Disable cursor
+#define LCD_CURSOR_NONE      0b00001100
+// Set cursor to still underscore
+#define LCD_CURSOR_BAR       0b00001110
+// Set cursor to blinking block
+#define LCD_CURSOR_BLINK     0b00001101
+// Set cursor to both of the above at once
+#define LCD_CURSOR_BOTH      (LCD_CURSOR_BAR | LCD_CURSOR_BLINK)
+
+// Move cursor
+#define LCD_MOVE_LEFT  0b00010000
+#define LCD_MOVE_RIGHT 0b00010100
+
+// Shift display
+#define LCD_SHIFT_LEFT  0b00011000
+#define LCD_SHIFT_RIGHT 0b00011100
+
+// Set iface to 5x7 font, 1-line
+#define LCD_IFACE_4BIT_1LINE 0b00100000
+#define LCD_IFACE_8BIT_1LINE 0b00110000
+// Set iface to 5x7 font, 2-line
+#define LCD_IFACE_4BIT_2LINE 0b00101000
+#define LCD_IFACE_8BIT_2LINE 0b00111000
+
+
+// Start address of rows
+const uint8_t LCD_ROW_ADDR[] = {0x00, 0x40, 0x14, 0x54};
+
+// prototypes
+
+// --- PUBLIC API ---
+
+/** Init the display */
+void lcd_init();
+/** Write a command */
+void lcd_write_command(const uint8_t bb);
+/** Write data byte */
+void lcd_write_data(const uint8_t bb);
+/** Read busy flag & address */
+uint8_t lcd_read_bf_addr();
+/** Read byte from ram */
+uint8_t lcd_read_ram();
+/** Show string */
+void lcd_str(char* str);
+/** Show string at X, Y */
+#define lcd_str_xy(x, y, str_p) do { lcd_xy((x), (y)); lcd_str((str_p)); } while(0)
+/** Show char */
+void lcd_char(const char c);
+/** Show char at X, Y */
+#define lcd_char_xy(x, y, c) do { lcd_xy((x), (y)); lcd_char((c)); } while(0)
+/** Move cursor to X, Y */
+void lcd_xy(const uint8_t x, const uint8_t y);
+/** Set address in CGRAM */
+void lcd_set_addr_cgram(const uint8_t acg);
+/** Set address in DDRAM */
+void lcd_set_addr(const uint8_t add);
+/** Go home */
+void lcd_home();
+/** Clear the screen */
+void lcd_clear();
+
+/** Set cursor */
+#define CURSOR_NONE  0b00
+#define CURSOR_BAR   0b10
+#define CURSOR_BLINK 0b01
+#define CURSOR_BOTH  0b11
+void lcd_cursor(uint8_t type);
+
+/** Disable / enable, preserving cursor */
+void lcd_disable();
+void lcd_enable();
+
+/** Define a custom glyph */
+void lcd_define_glyph(const uint8_t index, const uint8_t* array);
+
+
+// Internals
+void _lcd_mode_r();
+void _lcd_mode_w();
+void _lcd_clk();
+void _lcd_wait_bf();
+void _lcd_write_byte(uint8_t bb);
+uint8_t _lcd_read_byte();
+
+
+// Write utilities
+#define _lcd_write_low(bb)  _lcd_write_nibble((bb) & 0x0F)
+#define _lcd_write_high(bb) _lcd_write_nibble(((bb) & 0xF0) >> 4)
+#define _lcd_write_nibble(nib) do {                \
+	write_pin(LCD_PIN_D7, get_bit((nib), 3));     \
+	write_pin(LCD_PIN_D6, get_bit((nib), 2));     \
+	write_pin(LCD_PIN_D5, get_bit((nib), 1));     \
+	write_pin(LCD_PIN_D4, get_bit((nib), 0));     \
+} while(0)
+
+
+
+// 0 W, 1 R
+bool _lcd_mode;
+
+/** Initialize the display */
+void lcd_init()
+{
+	// configure pins as output
+	as_output(LCD_PIN_E);
+	as_output(LCD_PIN_RW);
+	as_output(LCD_PIN_RS);
+	_lcd_mode = 1;  // force data pins to output
+	_lcd_mode_w();
+
+	// Magic sequence to enter 4-bit mode
+	_delay_ms(16);
+	_lcd_write_nibble(0b0011);
+	_lcd_clk();
+	_delay_ms(5);
+	_lcd_clk();
+	_delay_ms(5);
+	_lcd_clk();
+	_delay_ms(5);
+	_lcd_write_nibble(0b0010);
+	_lcd_clk();
+	_delay_us(100);
+
+	// Configure the display
+	lcd_write_command(LCD_IFACE_4BIT_2LINE);
+	lcd_write_command(LCD_DISABLE);
+	lcd_write_command(LCD_CLEAR);
+	lcd_write_command(LCD_MODE_INC);
+
+	lcd_enable();
+}
+
+
+
+/** Send a pulse on the ENABLE line */
+void _lcd_clk()
+{
+	pin_up(LCD_PIN_E);
+	delay_ns(420);
+	pin_down(LCD_PIN_E);
+}
+
+
+/** Enter READ mode */
+void _lcd_mode_r()
+{
+	if (_lcd_mode == 1) return;  // already in R mode
+
+	pin_up(LCD_PIN_RW);
+
+	as_input_pu(LCD_PIN_D7);
+	as_input_pu(LCD_PIN_D6);
+	as_input_pu(LCD_PIN_D5);
+	as_input_pu(LCD_PIN_D4);
+
+	_lcd_mode = 1;
+}
+
+
+/** Enter WRITE mode */
+void _lcd_mode_w()
+{
+	if (_lcd_mode == 0) return;  // already in W mode
+
+	pin_down(LCD_PIN_RW);
+
+	as_output(LCD_PIN_D7);
+	as_output(LCD_PIN_D6);
+	as_output(LCD_PIN_D5);
+	as_output(LCD_PIN_D4);
+
+	_lcd_mode = 0;
+}
+
+
+/** Read a byte */
+uint8_t _lcd_read_byte()
+{
+	_lcd_mode_r();
+
+	uint8_t res = 0;
+
+	_lcd_clk();
+	res = (read_pin(LCD_PIN_D7) << 7) | (read_pin(LCD_PIN_D6) << 6) | (read_pin(LCD_PIN_D5) << 5) | (read_pin(LCD_PIN_D4) << 4);
+
+	_lcd_clk();
+	res |= (read_pin(LCD_PIN_D7) << 3) | (read_pin(LCD_PIN_D6) << 2) | (read_pin(LCD_PIN_D5) << 1) | (read_pin(LCD_PIN_D4) << 0);
+
+	return res;
+}
+
+
+/** Write an instruction byte */
+void lcd_write_command(uint8_t bb)
+{
+	_lcd_wait_bf();
+	pin_down(LCD_PIN_RS);  // select instruction register
+	_lcd_write_byte(bb);    // send instruction byte
+}
+
+
+/** Write a data byte */
+void lcd_write_data(uint8_t bb)
+{
+	_lcd_wait_bf();
+	pin_up(LCD_PIN_RS);  // select data register
+	_lcd_write_byte(bb);  // send data byte
+}
+
+
+/** Read BF & Address */
+uint8_t lcd_read_bf_addr()
+{
+	pin_down(LCD_PIN_RS);
+	return _lcd_read_byte();
+}
+
+
+/** Read CGRAM or DDRAM */
+uint8_t lcd_read_ram()
+{
+	pin_up(LCD_PIN_RS);
+	return _lcd_read_byte();
+}
+
+
+/** Write a byte using the 8-bit interface */
+void _lcd_write_byte(uint8_t bb)
+{
+	_lcd_mode_w();  // enter W mode
+
+	_lcd_write_high(bb);
+	_lcd_clk();
+
+	_lcd_write_low(bb);
+	_lcd_clk();
+}
+
+
+
+/** Wait until the device is ready */
+void _lcd_wait_bf()
+{
+	while(lcd_read_bf_addr() & _BV(7));
+}
+
+
+/** Send a string to LCD */
+void lcd_str(char* str_p)
+{
+	while (*str_p)
+		lcd_char(*str_p++);
+}
+
+
+/** Sedn a char to LCD */
+void lcd_char(const char c)
+{
+	lcd_write_data(c);
+}
+
+
+/** Set cursor position */
+void lcd_xy(const uint8_t x, const uint8_t y)
+{
+	lcd_set_addr(LCD_ROW_ADDR[y] + (x));
+}
+
+
+uint8_t _lcd_old_cursor = CURSOR_NONE;
+bool _lcd_enabled = false;
+
+/** Set LCD cursor. If not enabled, only remember it. */
+void lcd_cursor(uint8_t type)
+{
+	_lcd_old_cursor = (type & CURSOR_BOTH);
+
+	if (_lcd_enabled) lcd_write_command(LCD_CURSOR_NONE | _lcd_old_cursor);
+}
+
+
+/** Display display (preserving cursor) */
+void lcd_disable()
+{
+	lcd_write_command(LCD_DISABLE);
+	_lcd_enabled = false;
+}
+
+
+/** Enable display (restoring cursor) */
+void lcd_enable()
+{
+	_lcd_enabled = true;
+	lcd_cursor(_lcd_old_cursor);
+}
+
+
+/** Go home */
+void lcd_home()
+{
+	lcd_write_command(LCD_HOME);
+}
+
+
+/** Clear the screen */
+void lcd_clear()
+{
+	lcd_write_command(LCD_CLEAR);
+}
+
+
+/** Define a glyph */
+void lcd_define_glyph(const uint8_t index, const uint8_t* array)
+{
+	lcd_set_addr_cgram(index * 8);
+	for (uint8_t i = 0; i < 8; ++i)	{
+		lcd_write_data(array[i]);
+	}
+}
+
+
+/** Define a glyph */
+void lcd_define_glyph_pgm(const uint8_t index, const uint8_t* array)
+{
+	lcd_set_addr_cgram(index * 8);
+	for (uint8_t i = 0; i < 8; ++i)	{
+		lcd_write_data(pgm_read_byte(&array[i]));
+	}
+}
+
+
+/** Set address in CGRAM */
+void lcd_set_addr_cgram(const uint8_t acg)
+{
+	lcd_write_command(0b01000000 | ((acg) & 0b00111111));
+}
+
+
+/** Set address in DDRAM */
+void lcd_set_addr(const uint8_t add)
+{
+	lcd_write_command(0b10000000 | ((add) & 0b01111111));
+}
diff --git a/projects/lcdsnake/lib/loops.h b/projects/lcdsnake/lib/loops.h
new file mode 100644
index 0000000..4fa963e
--- /dev/null
+++ b/projects/lcdsnake/lib/loops.h
@@ -0,0 +1,22 @@
+#pragma once
+
+/**
+  Custom loops
+*/
+
+// Repeat code n times (uint8_t counter)
+#define repeat(count) repeat_aux(count, _repeat_##__COUNTER__)
+#define repeat_aux(count, cntvar) for (uint8_t cntvar = 0; cntvar < (count); cntvar++)
+
+// Repeat code n times (uint16_t counter)
+#define repeatx(count) repeatx_aux(count, _repeatx_##__COUNTER__)
+#define repeatx_aux(count, cntvar) for (uint16_t cntvar = 0; cntvar < (count); cntvar++)
+
+// Repeat with custom counter name (uint8_t)
+#define loop(var, count) repeat_aux(count, var)
+// ..., uint16_t
+#define loopx(var, count) repeatx_aux(count, var)
+
+// Do until condition is met
+#define until(what) while(!(what))
+
diff --git a/projects/lcdsnake/lib/meta.h b/projects/lcdsnake/lib/meta.h
new file mode 100644
index 0000000..ec16799
--- /dev/null
+++ b/projects/lcdsnake/lib/meta.h
@@ -0,0 +1,6 @@
+#pragma once
+
+/** Weird constructs for the compiler */
+
+// general macros
+#define SECTION(pos) __attribute__((naked, used, section(pos)))
diff --git a/projects/lcdsnake/lib/nsdelay.h b/projects/lcdsnake/lib/nsdelay.h
new file mode 100644
index 0000000..73fd667
--- /dev/null
+++ b/projects/lcdsnake/lib/nsdelay.h
@@ -0,0 +1,21 @@
+#pragma once
+
+/**
+  Functions for precise delays (nanoseconds / cycles)
+*/
+
+#include <avr/io.h>
+#include <util/delay_basic.h>
+#include <stdint.h>
+
+/* Convert nanoseconds to cycle count */
+#define ns2cycles(ns)  ( (ns) / (1000000000L / (signed long) F_CPU) )
+
+/** Wait c cycles */
+#define delay_c(c)  (((c) > 0) ? __builtin_avr_delay_cycles(c) :  __builtin_avr_delay_cycles(0))
+
+/** Wait n nanoseconds, plus c cycles  */
+#define delay_ns_c(ns, c)  delay_c(ns2cycles(ns) + (c))
+
+/** Wait n nanoseconds  */
+#define delay_ns(ns)  delay_c(ns2cycles(ns))
diff --git a/projects/lcdsnake/lib/pins.h b/projects/lcdsnake/lib/pins.h
new file mode 100644
index 0000000..93960b4
--- /dev/null
+++ b/projects/lcdsnake/lib/pins.h
@@ -0,0 +1,107 @@
+#pragma once
+
+/**
+  This file provides macros for pin manipulation.
+
+  You can define your application pins like so:
+
+      // Led at PORTB, pin 1
+      #define LED B,1
+
+      // Switch at PORTD, pin 7
+      #define SW1 D,7
+
+  Now you can use macros from this file to wirh with the pins, eg:
+
+      as_output(LED);
+      as_input(SW1);
+      pullup_on(SW1);
+
+      toggle_pin(LED);
+      while (pin_is_low(SW1));
+
+  - The macros io2XXX() can be used to get literal name of register associated with the pin.
+  - io2n() provides pin number.
+  - The XXX_aux() macros are internal and should not be used elsewhere.
+  - The io_pack() macro is used to pass pin (io) to other macro without expanding it.
+*/
+
+#include <avr/io.h>
+#include "calc.h"
+
+
+// Get particular register associated with the name X (eg. D -> PORTD)
+#define reg_ddr(X) DDR ## X
+#define reg_port(X) PORT ## X
+#define reg_pin(X) PIN ## X
+
+#define io2ddr_aux(reg, bit) reg_ddr(reg)
+#define io2ddr(io) io2ddr_aux(io)
+#define io2port_aux(reg, bit) reg_port(reg)
+#define io2port(io) io2port_aux(io)
+#define io2pin_aux(reg, bit) reg_pin(reg)
+#define io2pin(io) io2pin_aux(io)
+#define io2n_aux(reg, bit) bit
+#define io2n(io) io2n_aux(io)
+
+#define io_pack(port, bit) port, bit
+
+
+// pointer to port
+typedef volatile uint8_t* PORT_P;
+// number of bit in port
+typedef uint8_t BIT_N;
+
+
+// === pin manipulation ===
+#define set_pin_aux(port, bit) sbi(reg_port(port), (bit))
+#define clear_pin_aux(port, bit) cbi(reg_port(port), (bit))
+#define read_pin_aux(port, bit) get_bit(reg_pin(port), (bit))
+#define write_pin_aux(port, bit, value) set_bit(reg_port(port), (bit), (value))
+#define toggle_pin_aux(port, bit) sbi(reg_pin(port), (bit))
+
+
+#define pin_up(io) set_pin_aux(io)
+#define pin_high(io) set_pin_aux(io)
+
+#define pin_down(io) clear_pin_aux(io)
+#define pin_low(io) clear_pin_aux(io)
+
+#define get_pin(io) read_pin_aux(io)
+#define read_pin(io) read_pin_aux(io)
+
+#define pin_is_low(io) !read_pin_aux(io)
+#define pin_is_high(io) read_pin_aux(io)
+
+#define set_pin(io, value) write_pin_aux(io, (value))
+#define write_pin(io, value) write_pin_aux(io, (value))
+#define toggle_pin(io) toggle_pin_aux(io)
+
+
+
+// setting pin direction
+#define as_input_aux(port, bit) cbi(reg_ddr(port), (bit))
+#define as_output_aux(port, bit) sbi(reg_ddr(port), (bit))
+#define set_dir_aux(port, bit, dir) write_bit(reg_ddr(port), (bit), (dir))
+
+
+#define as_input(io) as_input_aux(io)
+#define as_input_pu(io) do { as_input_aux(io); pullup_enable_aux(io); } while(0)
+
+#define as_output(io) as_output_aux(io)
+#define set_dir(io, dir) set_dir_aux(io, (dir))
+
+
+// setting pullup
+#define pullup_enable_aux(port, bit) sbi(reg_port(port), (bit))
+#define pullup_disable_aux(port, bit) cbi(reg_port(port), (bit))
+#define set_pullup_aux(port, bit, on) write_bit(reg_port(port), (bit), (on))
+
+
+#define pullup_enable(io) pullup_enable_aux(io)
+#define pullup_on(io) pullup_enable_aux(io)
+
+#define pullup_disable(io) pullup_disable_aux(io)
+#define pullup_off(io) pullup_disable_aux(io)
+
+#define set_pullup(io, on) set_pullup_aux(io, on)
diff --git a/projects/lcdsnake/lib/ws_rgb.h b/projects/lcdsnake/lib/ws_rgb.h
new file mode 100644
index 0000000..80223c2
--- /dev/null
+++ b/projects/lcdsnake/lib/ws_rgb.h
@@ -0,0 +1,98 @@
+#pragma once
+
+/**
+  Utils for driving a WS28xx (tested on WS2812B) RGB LED strips.
+
+  It's implemented as macros to avoid overhead when passing values, and to
+  enable driving multiple strips at once.
+
+  To avoid bloating your code, try to reduce the number of invocations -
+  compute color and then send it.
+
+  [IMPORTANT]
+
+  Some seemingly random influences can ruin the communication.
+  If you have enough memory, consider preparing the colors in array,
+  and sending this array using one of the "ws_send_XXX_array" macros.
+
+*/
+
+#include <avr/io.h>
+
+#include "pins.h"
+#include "nsdelay.h"
+#include "colors.h"
+
+/* Driver code for WS2812B */
+
+// --- timing constraints (NS) ---
+
+#ifndef WS_T_1H
+# define WS_T_1H  700
+#endif
+
+#ifndef WS_T_1L
+# define WS_T_1L  150
+#endif
+
+#ifndef WS_T_0H
+# define WS_T_0H  150
+#endif
+
+#ifndef WS_T_0L
+# define WS_T_0L  700
+#endif
+
+#ifndef WS_T_LATCH
+# define WS_T_LATCH 7000
+#endif
+
+
+/** Wait long enough for the colors to show */
+#define ws_show() do {delay_ns_c(WS_T_LATCH, 0); } while(0)
+
+
+/** Send one byte to the RGB strip */
+#define ws_send_byte(io, bb) do {										\
+	for (volatile int8_t __ws_tmp = 7; __ws_tmp >= 0; --__ws_tmp) {		\
+		if ((bb) & (1 << __ws_tmp)) {									\
+			pin_high(io_pack(io)); delay_ns_c(WS_T_1H, -2);				\
+			pin_low(io_pack(io)); delay_ns_c(WS_T_1L, -10);				\
+		} else {														\
+			pin_high(io_pack(io)); delay_ns_c(WS_T_0H, -2);				\
+			pin_low(io_pack(io)); delay_ns_c(WS_T_0L, -10);				\
+		}																\
+	}																	\
+} while(0)
+
+
+/** Send R,G,B color to the strip */
+#define ws_send_rgb(io, r, g, b) do {			\
+	ws_send_byte(io_pack(io), g);				\
+	ws_send_byte(io_pack(io), r);				\
+	ws_send_byte(io_pack(io), b);				\
+} while(0)
+
+/** Send a RGB struct */
+#define ws_send_xrgb(io, xrgb) ws_send_rgb(io_pack(io), (xrgb).r, (xrgb).g, (xrgb).b)
+
+/** Send color hex */
+#define ws_send_rgb24(io, rgb) ws_send_rgb(io_pack(io), rgb24_r(rgb), rgb24_g(rgb), rgb24_b(rgb))
+#define ws_send_rgb15(io, rgb) ws_send_rgb(io_pack(io), rgb15_r(rgb), rgb15_g(rgb), rgb15_b(rgb))
+#define ws_send_rgb12(io, rgb) ws_send_rgb(io_pack(io), rgb12_r(rgb), rgb12_g(rgb), rgb12_b(rgb))
+#define ws_send_rgb6(io, rgb)  ws_send_rgb(io_pack(io), rgb6_r(rgb),  rgb6_g(rgb),  rgb6_b(rgb))
+
+/** Send array of colors */
+#define ws_send_xrgb_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), xrgb)
+#define ws_send_rgb24_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb24)
+#define ws_send_rgb15_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb15)
+#define ws_send_rgb12_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb12)
+#define ws_send_rgb6_array(io, rgbs, length) __ws_send_array_proto(io_pack(io), (rgbs), (length), rgb6)
+
+// prototype for sending array. it's ugly, sorry.
+#define __ws_send_array_proto(io, rgbs, length, style) do {								\
+	for (uint8_t __ws_tmp_sap_i = 0; __ws_tmp_sap_i < length; __ws_tmp_sap_i++) {		\
+		style ## _t __ws_tmp_sap2 = (rgbs)[__ws_tmp_sap_i];								\
+		ws_send_ ## style(io_pack(io), __ws_tmp_sap2);									\
+	}																					\
+} while(0)
diff --git a/projects/lcdsnake/lib/yeolde.h b/projects/lcdsnake/lib/yeolde.h
new file mode 100644
index 0000000..cbdb863
--- /dev/null
+++ b/projects/lcdsnake/lib/yeolde.h
@@ -0,0 +1,31 @@
+#pragma once
+
+/**
+  Ye Olde Control Structures
+*/
+
+#include "loops.h"
+
+#define whilst(what) while((what))
+#define when(what) if((what))
+#define otherwise else
+#define commence {
+#define then {
+#define cease }
+#define choose(what) switch((what))
+#define option case
+#define shatter break
+#define replay continue
+#define equals ==
+#define is ==
+#define be =
+#define over >
+#define above >
+#define under <
+#define below <
+#define let /**/
+#define raise(what) (what)++
+
+#define number int
+
+#warning "This is a joke. Do not use YeOlde.h in serious code!"
diff --git a/projects/lcdsnake/main.c b/projects/lcdsnake/main.c
new file mode 100644
index 0000000..4b5c438
--- /dev/null
+++ b/projects/lcdsnake/main.c
@@ -0,0 +1,426 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/pgmspace.h>
+#include <util/delay.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "lib/meta.h"
+#include "lib/arduino_pins.h"
+#include "lib/calc.h"
+#include "lib/adc.h"
+
+#define LCD_PIN_RS D10
+#define LCD_PIN_RW D11
+#define LCD_PIN_E  D12
+#define LCD_PIN_D4 D13
+#define LCD_PIN_D5 D14
+#define LCD_PIN_D6 D15
+#define LCD_PIN_D7 D16
+// D17 = A3 = source of entropy for random.
+
+#include "lib/lcd.h"
+
+
+// Buttons (to ground)
+#define BTN_LEFT     D2
+#define BTN_RIGHT    D3
+#define BTN_UP       D4
+#define BTN_DOWN     D5
+#define BTN_SELECT   D6
+#define BTN_RESTART  D7
+
+// Debouncer channels for buttons
+// (Must be added in this order to debouncer)
+#define D_LEFT      0
+#define D_RIGHT     1
+#define D_UP        2
+#define D_DOWN      3
+#define D_SELECT    4
+#define D_RESTART   5
+
+#define DEBO_CHANNELS 6
+#define DEBO_TICKS 1  // in 0.01s
+
+#include "lib/debounce.h"
+
+// Board size (!!! rows = 2x number of display lines, max 2*4 = 8 !!!)
+#define ROWS 4
+#define COLS 20
+
+// Delay between snake steps, in 10 ms
+#define STEP_DELAY 24
+
+// proto
+void update();
+void init_cgram();
+void init_gameboard();
+
+void SECTION(".init8") init()
+{
+	// Randomize RNG
+	adc_init();
+	srand(adc_read_word(3));
+
+	// Init LCD
+	lcd_init();
+	init_cgram();  // load default glyphs
+
+	// Init game board.
+	init_gameboard();
+
+	// gamepad buttons
+	as_input_pu(BTN_LEFT);
+	as_input_pu(BTN_RIGHT);
+	as_input_pu(BTN_UP);
+	as_input_pu(BTN_DOWN);
+	as_input_pu(BTN_SELECT);
+	as_input_pu(BTN_RESTART);
+
+	// add buttons to debouncer
+	debo_add_rev(BTN_LEFT);
+	debo_add_rev(BTN_RIGHT);
+	debo_add_rev(BTN_UP);
+	debo_add_rev(BTN_DOWN);
+	debo_add_rev(BTN_SELECT);
+	debo_add_rev(BTN_RESTART);
+
+	// setup timer
+	TCCR0A = _BV(WGM01); // CTC
+	TCCR0B = _BV(CS02) | _BV(CS00);  // prescaler 1024
+	OCR0A = 156;  // interrupt every 10 ms
+	sbi(TIMSK0, OCIE0A);
+	sei();
+}
+
+
+/** timer 0 interrupt vector */
+ISR(TIMER0_COMPA_vect)
+{
+	debo_tick();  // poll debouncer
+	update();  // update and display
+}
+
+
+
+// sub-glyphs
+#define _HEAD_ 15, 21, 21, 30
+#define _BODY_ 15, 31, 31, 30
+#define _FOOD_ 10, 21, 17, 14
+//14, 17, 17, 14
+#define _NONE_  0,  0,  0,  0
+
+// complete glyphs for loading into memory
+
+// Only one food & one head glyph have to be loaded at a time.
+
+// Body - Body
+const uint8_t SYMBOL_BB[] PROGMEM = {_BODY_, _BODY_};
+
+// Body - None
+const uint8_t SYMBOL_BX[] PROGMEM = {_BODY_, _NONE_};
+const uint8_t SYMBOL_XB[] PROGMEM = {_NONE_, _BODY_};
+
+// Head - None
+const uint8_t SYMBOL_HX[] PROGMEM = {_HEAD_, _NONE_};
+const uint8_t SYMBOL_XH[] PROGMEM = {_NONE_, _HEAD_};
+
+// Body - Head
+const uint8_t SYMBOL_BH[] PROGMEM = {_BODY_, _HEAD_};
+const uint8_t SYMBOL_HB[] PROGMEM = {_HEAD_, _BODY_};
+
+// Head - Food
+const uint8_t SYMBOL_HF[] PROGMEM = {_HEAD_, _FOOD_};
+const uint8_t SYMBOL_FH[] PROGMEM = {_FOOD_, _HEAD_};
+
+// Food - None
+const uint8_t SYMBOL_FX[] PROGMEM = {_FOOD_, _NONE_};
+const uint8_t SYMBOL_XF[] PROGMEM = {_NONE_, _FOOD_};
+
+// Body - Food
+const uint8_t SYMBOL_BF[] PROGMEM = {_BODY_, _FOOD_};
+const uint8_t SYMBOL_FB[] PROGMEM = {_FOOD_, _BODY_};
+
+
+// board block (snake, food...)
+typedef enum {
+	bEMPTY = 0x00,
+	bHEAD = 0x01,
+	bFOOD = 0x02,
+	bBODY_LEFT = 0x80,
+	bBODY_RIGHT = 0x81,
+	bBODY_UP = 0x82,
+	bBODY_DOWN = 0x83,
+} block_t;
+
+// Snake direction
+typedef enum {
+	dLEFT = 0x00,
+	dRIGHT = 0x01,
+	dUP = 0x02,
+	dDOWN = 0x03,
+} dir_t;
+
+// Coordinate on board
+typedef struct {
+	int8_t x;
+	int8_t y;
+} coord_t;
+
+#define is_body(blk) (((blk) & 0x80) != 0)
+#define mk_body_dir(dir) (0x80 + (dir))
+
+// compare two coords
+#define coord_eq(a, b) (((a).x == (b).x) && ((a).y == (b).y))
+
+
+bool crashed;
+uint8_t snake_len;
+
+// y, x indexing
+block_t board[ROWS][COLS];
+
+coord_t head_pos;
+coord_t tail_pos;
+dir_t head_dir;
+
+const uint8_t CODE_BB = 0;
+const uint8_t CODE_BX = 1;
+const uint8_t CODE_XB = 2;
+const uint8_t CODE_H = 3;  // glyph with head, dynamic
+const uint8_t CODE_F = 4;  // glyph with food, dynamic
+const uint8_t CODE_XX = 32; // space
+
+
+// Set a block in board
+#define set_block_xy(x, y, block) do { board[y][x] = (block); } while(0)
+#define get_block_xy(x, y) board[y][x]
+#define get_block(pos) get_block_xy((pos).x, (pos).y)
+#define set_block(pos, block) set_block_xy((pos).x, (pos).y, (block))
+
+
+void init_cgram()
+{
+	// those will be always the same
+	lcd_define_glyph_pgm(CODE_BB, SYMBOL_BB);
+	lcd_define_glyph_pgm(CODE_BX, SYMBOL_BX);
+	lcd_define_glyph_pgm(CODE_XB, SYMBOL_XB);
+						lcd_define_glyph_pgm(5, SYMBOL_XF);
+}
+
+
+void place_food()
+{
+	while(1) {
+		const uint8_t xx = rand() % COLS;
+		const uint8_t yy = rand() % ROWS;
+
+		if (get_block_xy(xx, yy) == bEMPTY) {
+			set_block_xy(xx, yy, bFOOD);
+			break;
+		}
+	}
+}
+
+
+void init_gameboard()
+{
+	//erase the board
+	for (uint8_t x = 0; x < COLS; x++) {
+		for (uint8_t y = 0; y < ROWS; y++) {
+			set_block_xy(x, y, bEMPTY);
+		}
+	}
+
+	lcd_clear();
+
+	tail_pos = (coord_t) {.x = 0, .y = 0};
+
+	set_block_xy(0, 0, bBODY_RIGHT);
+	set_block_xy(1, 0, bBODY_RIGHT);
+	set_block_xy(2, 0, bBODY_RIGHT);
+	set_block_xy(3, 0, bHEAD);
+
+	head_pos = (coord_t) {.x = 3, .y = 0};
+
+	snake_len = 4; // includes head
+
+	head_dir = dRIGHT;
+	crashed = false;
+
+	place_food();
+}
+
+
+uint8_t presc = 0;
+
+bool restart_held;
+void update()
+{
+	if (debo_get_pin(D_RESTART)) {
+
+		if (!restart_held) {
+			// restart
+			init_gameboard();
+			presc = 0;
+			restart_held = true;
+		}
+
+	} else {
+		restart_held = false;
+	}
+
+	if(!crashed) {
+
+		// resolve movement direction
+		if (debo_get_pin(D_LEFT))
+			head_dir = dLEFT;
+		else if (debo_get_pin(D_RIGHT))
+			head_dir = dRIGHT;
+		else if (debo_get_pin(D_UP))
+			head_dir = dUP;
+		else if (debo_get_pin(D_DOWN))
+			head_dir = dDOWN;
+
+		// time's up for a move
+		if (presc++ == STEP_DELAY) {
+			presc = 0;
+
+			// move snake
+			const coord_t oldpos = head_pos;
+
+			switch (head_dir) {
+				case dLEFT:  head_pos.x--; break;
+				case dRIGHT: head_pos.x++; break;
+				case dUP:    head_pos.y--; break;
+				case dDOWN:  head_pos.y++; break;
+			}
+
+			bool do_move = false;
+			bool do_grow = false;
+
+			if (head_pos.x < 0 || head_pos.x >= COLS || head_pos.y < 0 || head_pos.y >= ROWS) {
+				// ouch, a wall!
+				crashed = true;
+			} else {
+				// check if tile occupied or not
+				if (coord_eq(head_pos, tail_pos)) {
+					// head moved in previous tail, that's OK.
+					do_move = true;
+				} else {
+					// moved to other tile than tail
+					switch (get_block(head_pos)) {
+
+						case bFOOD:
+							do_grow = true;  // fall through
+						case bEMPTY:
+							do_move = true;
+							break;
+
+						default: // includes all BODY_xxx
+							crashed = true;  // snake crashed into some block
+					}
+				}
+			}
+
+			if (do_move) {
+				// Move tail
+				if (do_grow) {
+					// let tail as is
+					snake_len++; // grow the counter
+				} else {
+					// tail dir
+					dir_t td = get_block(tail_pos) & 0xF;
+
+					// clean tail
+					set_block(tail_pos, bEMPTY);
+
+					// move tail based on old direction of tail block
+					switch (td) {
+						case dLEFT:  tail_pos.x--; break;
+						case dRIGHT: tail_pos.x++; break;
+						case dUP:    tail_pos.y--; break;
+						case dDOWN:  tail_pos.y++; break;
+					}
+				}
+
+				// Move head
+				set_block(head_pos, bHEAD);  // place head in new pos
+				set_block(oldpos, mk_body_dir(head_dir));  // directional body in old head pos
+
+				if (do_grow) {
+					// food eaten, place new
+					place_food();
+				}
+			}
+		}
+	} // end !crashed
+
+
+	// Render the board
+	for (uint8_t r = 0; r < ROWS / 2; r++)	{
+		lcd_xy(0, r);
+		for (uint8_t c = 0; c < COLS; c++)	{
+			const block_t t1 = get_block_xy(c, r * 2);
+			const block_t t2 = get_block_xy(c, (r * 2) + 1);
+
+			uint8_t code = '!';  // ! marks fail
+
+			if ((t1 == bEMPTY) && (t2 == bEMPTY)) {
+				code = CODE_XX;
+				if (crashed) code = '*';
+			} else if (is_body(t1) && is_body(t2))
+				code = CODE_BB;
+			else if (is_body(t1) && (t2 == bEMPTY))
+				code = CODE_BX;
+			else if (t1 == bEMPTY && is_body(t2))
+				code = CODE_XB;
+			else if ((t1 == bFOOD) || (t2 == bFOOD)) {
+				// one is food
+
+				code = CODE_F;
+
+				if (t1 == bFOOD) {
+					if (t2 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_FX);
+					else if (t2 == bHEAD)
+						lcd_define_glyph_pgm(code, SYMBOL_FH);
+					else if (is_body(t2))
+						lcd_define_glyph_pgm(code, SYMBOL_FB);
+				} else { // t2 is food
+					if (t1 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_XF);
+					else if (t1 == bHEAD)
+						lcd_define_glyph_pgm(code, SYMBOL_HF);
+					else if (is_body(t1))
+						lcd_define_glyph_pgm(code, SYMBOL_BF);
+				}
+				lcd_xy(c,r);
+
+			} else if ((t1 == bHEAD )|| (t2 == bHEAD)) {
+				// one is head
+
+				code = CODE_H;
+
+				if (t1 == bHEAD) {
+					if (t2 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_HX);
+					else if (is_body(t2))
+						lcd_define_glyph_pgm(code, SYMBOL_HB);
+				} else { // t2 is head
+					if (t1 == bEMPTY)
+						lcd_define_glyph_pgm(code, SYMBOL_XH);
+					else if (is_body(t1))
+						lcd_define_glyph_pgm(code, SYMBOL_BH);
+				}
+
+				lcd_xy(c,r);
+			}
+
+			lcd_char(code);
+		}
+	}
+}
+
+void main() { while(1); } // timer does everything