From da77ed14ee19be9f3cf0fabe1eb1efb0085bcf04 Mon Sep 17 00:00:00 2001
From: Michel Pollet <buserror@gmail.com>
Date: Mon, 21 Feb 2011 18:05:44 +0000
Subject: [PATCH] board_hd44780: New sample code

Emulated a complete HD44780 LCd screen, and uses a standard
AVR driver to write on it.

Signed-off-by: Michel Pollet <buserror@gmail.com>
---
 examples/board_charlcd/ac_input.c             |   18 -
 examples/board_charlcd/ac_input.h             |   23 -
 examples/board_charlcd/atmega48_charlcd.c     |   62 -
 examples/board_charlcd/atmega48_lcd.c         |  146 ---
 examples/board_charlcd/atmega48_lcd.h         |   33 -
 examples/board_charlcd/charlcd.c              |  228 ----
 examples/board_charlcd/hd44780.c              |  185 ---
 examples/board_charlcd/hd44780.h              |   69 --
 examples/board_charlcd/hd44780_glut.c         |   94 --
 examples/board_charlcd/hd44780_glut.h         |   10 -
 .../{board_charlcd => board_hd77480}/Makefile |   29 +-
 examples/board_hd77480/README                 |   21 +
 examples/board_hd77480/atmega48_charlcd.c     |  114 ++
 examples/board_hd77480/avr_hd44780.c          |  216 ++++
 examples/board_hd77480/avr_hd44780.h          |  105 ++
 examples/board_hd77480/avr_hd44780_conf.h     |   23 +
 examples/board_hd77480/charlcd.c              |  246 ++++
 .../data/blu.tiff                             |  Bin
 .../data}/font.tiff                           |  Bin
 .../data/processblu.py                        |    0
 examples/board_hd77480/font.h                 | 1070 +++++++++++++++++
 examples/parts/ac_input.c                     |   45 +
 examples/parts/ac_input.h                     |   49 +
 examples/parts/hd44780.c                      |  374 ++++++
 examples/parts/hd44780.h                      |  137 +++
 examples/parts/hd44780_glut.c                 |  151 +++
 examples/parts/hd44780_glut.h                 |   38 +
 27 files changed, 2596 insertions(+), 890 deletions(-)
 delete mode 100644 examples/board_charlcd/ac_input.c
 delete mode 100644 examples/board_charlcd/ac_input.h
 delete mode 100644 examples/board_charlcd/atmega48_charlcd.c
 delete mode 100644 examples/board_charlcd/atmega48_lcd.c
 delete mode 100644 examples/board_charlcd/atmega48_lcd.h
 delete mode 100644 examples/board_charlcd/charlcd.c
 delete mode 100644 examples/board_charlcd/hd44780.c
 delete mode 100644 examples/board_charlcd/hd44780.h
 delete mode 100644 examples/board_charlcd/hd44780_glut.c
 delete mode 100644 examples/board_charlcd/hd44780_glut.h
 rename examples/{board_charlcd => board_hd77480}/Makefile (63%)
 create mode 100644 examples/board_hd77480/README
 create mode 100644 examples/board_hd77480/atmega48_charlcd.c
 create mode 100644 examples/board_hd77480/avr_hd44780.c
 create mode 100644 examples/board_hd77480/avr_hd44780.h
 create mode 100644 examples/board_hd77480/avr_hd44780_conf.h
 create mode 100644 examples/board_hd77480/charlcd.c
 rename examples/{board_charlcd => board_hd77480}/data/blu.tiff (100%)
 rename examples/{board_charlcd => board_hd77480/data}/font.tiff (100%)
 rename examples/{board_charlcd => board_hd77480}/data/processblu.py (100%)
 create mode 100644 examples/board_hd77480/font.h
 create mode 100644 examples/parts/ac_input.c
 create mode 100644 examples/parts/ac_input.h
 create mode 100644 examples/parts/hd44780.c
 create mode 100644 examples/parts/hd44780.h
 create mode 100644 examples/parts/hd44780_glut.c
 create mode 100644 examples/parts/hd44780_glut.h

diff --git a/examples/board_charlcd/ac_input.c b/examples/board_charlcd/ac_input.c
deleted file mode 100644
index 29447f5..0000000
--- a/examples/board_charlcd/ac_input.c
+++ /dev/null
@@ -1,18 +0,0 @@
-
-#include "sim_avr.h"
-#include "ac_input.h"
-#include "stdio.h"
-
-static avr_cycle_count_t switch_auto( struct avr_t * avr, avr_cycle_count_t when, void * param){
-    ac_input_t * b = (ac_input_t *)param;
-    b->value = b->value == 0 ? 1 : 0;
-    avr_raise_irq( b->irq + IRQ_AC_OUT, b->value );
-    return when + avr_usec_to_cycles(avr,10000);
-}
-
-void ac_input_init(struct avr_t *avr, ac_input_t *b){
-    b->irq = avr_alloc_irq(0,IRQ_AC_COUNT);
-    b->avr = avr;
-    b->value = 0;
-    avr_cycle_timer_register_usec(avr, 10000, switch_auto, b);
-}
diff --git a/examples/board_charlcd/ac_input.h b/examples/board_charlcd/ac_input.h
deleted file mode 100644
index 07c2c4b..0000000
--- a/examples/board_charlcd/ac_input.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#ifndef __AC_INPUT_H__
-#define __AC_INPUT_H__
-
-#include "sim_irq.h"
-
-/*
- * Simulates a 50hz changing signal
- */
-
-enum {
-    IRQ_AC_OUT = 0,
-    IRQ_AC_COUNT
-};
-
-typedef struct ac_input_t {
-    avr_irq_t * irq;
-    struct avr_t * avr;
-    uint8_t value;
-} ac_input_t;
-
-void ac_input_init(struct avr_t * avr, ac_input_t * b);
-
-#endif
diff --git a/examples/board_charlcd/atmega48_charlcd.c b/examples/board_charlcd/atmega48_charlcd.c
deleted file mode 100644
index 993190a..0000000
--- a/examples/board_charlcd/atmega48_charlcd.c
+++ /dev/null
@@ -1,62 +0,0 @@
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <util/delay.h>
-#include "stdlib.h"
-#include "string.h"
-
-#include "atmega48_lcd.h"
-
-#include "avr_mcu_section.h"
-AVR_MCU(F_CPU, "atmega48");
-
-static uint8_t subsecct = 0;
-static uint8_t hour = 0;
-static uint8_t minute = 0;
-static uint8_t second = 0;
-static volatile uint8_t update_needed = 0;
-
-ISR( INT0_vect ){
-    /* External interrupt on pin D2 */
-    subsecct++;
-    if( subsecct == 50 ){
-        second++;
-        update_needed = 1;
-        if(second ==60){
-            minute++;
-            second = 0;
-            if(minute==60){
-                minute =0;
-                hour++;
-                if(hour==24) hour =0;
-            }
-        }
-    }
-}
-
-int main(){
-    lcd_init();
-   
-
-    EICRA = (1<<ISC00);
-    EIMSK = (1<<INT0);
- 
-    sei();
-
-    while(1)
-    {
-          while(!update_needed);
-          update_needed = 0;
-          char buffer[16];
-          lcd_clear();
-          set_cursor(4,1);
-          itoa(hour,buffer,10);
-          lcd_string(buffer);
-          lcd_data(':');
-          itoa(minute,buffer,10);
-          lcd_string(buffer);
-          lcd_data(':');
-          itoa(second,buffer,10);
-          lcd_string(buffer);
-    }
-
-}
diff --git a/examples/board_charlcd/atmega48_lcd.c b/examples/board_charlcd/atmega48_lcd.c
deleted file mode 100644
index 9822188..0000000
--- a/examples/board_charlcd/atmega48_lcd.c
+++ /dev/null
@@ -1,146 +0,0 @@
-// Ansteuerung eines HD44780 kompatiblen LCD im 4-Bit-Interfacemodus
-// http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial/LCD-Ansteuerung
-//
-// Die Pinbelegung ist über defines in lcd-routines.h einstellbar
- 
-#include <avr/io.h>
-#include "atmega48_lcd.h"
-#include <util/delay.h>
- 
-// sendet ein Datenbyte an das LCD
- 
-void lcd_data(unsigned char temp1)
-{
-   unsigned char temp2 = temp1;
- 
-   LCD_PORT |= (1<<LCD_RS);        // RS auf 1 setzen
- 
-   temp1 = temp1 >> 4;
-   temp1 = temp1 & 0x0F;
-   LCD_PORT &= 0xF0;
-   LCD_PORT |= temp1;               // setzen
-   lcd_enable();
- 
-   temp2 = temp2 & 0x0F;
-   LCD_PORT &= 0xF0;
-   LCD_PORT |= temp2;               // setzen
-   lcd_enable();
-   
-   _delay_us(42);
-}
- 
-// sendet einen Befehl an das LCD
- 
-void lcd_command(unsigned char temp1)
-{
-   unsigned char temp2 = temp1;
- 
-   LCD_PORT &= ~(1<<LCD_RS);        // RS auf 0 setzen
- 
-   temp1 = temp1 >> 4;              // oberes Nibble holen
-   temp1 = temp1 & 0x0F;            // maskieren
-   LCD_PORT &= 0xF0;
-   LCD_PORT |= temp1;               // setzen
-   lcd_enable();
- 
-   temp2 = temp2 & 0x0F;            // unteres Nibble holen und maskieren
-   LCD_PORT &= 0xF0;
-   LCD_PORT |= temp2;               // setzen
-   lcd_enable();
-   
-   _delay_us(42);
-}
- 
-// erzeugt den Enable-Puls
-void lcd_enable(void)
-{
-   // Bei Problemen ggf. Pause gemäß Datenblatt des LCD Controllers einfügen
-   // http://www.mikrocontroller.net/topic/81974#685882
-   LCD_PORT |= (1<<LCD_EN);
-    _delay_us(1);                   // kurze Pause
-   // Bei Problemen ggf. Pause gemäß Datenblatt des LCD Controllers verlängern
-   // http://www.mikrocontroller.net/topic/80900
-   LCD_PORT &= ~(1<<LCD_EN);
-}
- 
-// Initialisierung: 
-// Muss ganz am Anfang des Programms aufgerufen werden.
- 
-void lcd_init(void)
-{
-   LCD_DDR = LCD_DDR | 0x0F | (1<<LCD_RS) | (1<<LCD_EN);   // Port auf Ausgang schalten
- 
-   // muss 3mal hintereinander gesendet werden zur Initialisierung
- 
-   _delay_ms(15);
-   LCD_PORT &= 0xF0;
-   LCD_PORT |= 0x03;            
-   LCD_PORT &= ~(1<<LCD_RS);      // RS auf 0
-   lcd_enable();
- 
-   _delay_ms(5);
-   lcd_enable();
- 
-   _delay_ms(1);
-   lcd_enable();
-   _delay_ms(1);
- 
-   // 4 Bit Modus aktivieren 
-   LCD_PORT &= 0xF0;
-   LCD_PORT |= 0x02;
-   lcd_enable();
-   _delay_ms(1);
- 
-   // 4Bit / 2 Zeilen / 5x7
-   lcd_command(0x28);
-    
-   // Display ein / Cursor aus / kein Blinken
-   lcd_command(0x0C); 
- 
-   // inkrement / kein Scrollen
-   lcd_command(0x06);
- 
-   lcd_clear();
-}
- 
-// Sendet den Befehl zur Löschung des Displays
- 
-void lcd_clear(void)
-{
-   lcd_command(CLEAR_DISPLAY);
-   _delay_ms(5);
-}
- 
-// Sendet den Befehl: Cursor Home
- 
-void lcd_home(void)
-{
-   lcd_command(CURSOR_HOME);
-   _delay_ms(5);
-}
- 
-// setzt den Cursor in Zeile y (1..4) Spalte x (0..15)
- 
-void set_cursor(uint8_t x, uint8_t y)
-{
-  uint8_t tmp;
- 
-  switch (y) {
-    case 1: tmp=0x80+0x00+x; break;    // 1. Zeile
-    case 2: tmp=0x80+0x40+x; break;    // 2. Zeile
-    case 3: tmp=0x80+0x10+x; break;    // 3. Zeile
-    case 4: tmp=0x80+0x50+x; break;    // 4. Zeile
-    default: return;                   // für den Fall einer falschen Zeile
-  }
-  lcd_command(tmp);
-}
- 
-// Schreibt einen String auf das LCD
- 
-void lcd_string(char *data)
-{
-    while(*data) {
-        lcd_data(*data);
-        data++;
-    }
-}
diff --git a/examples/board_charlcd/atmega48_lcd.h b/examples/board_charlcd/atmega48_lcd.h
deleted file mode 100644
index ebb6909..0000000
--- a/examples/board_charlcd/atmega48_lcd.h
+++ /dev/null
@@ -1,33 +0,0 @@
-#ifndef LCD_H
-#define LCD_H
-
-// Ansteuerung eines HD44780 kompatiblen LCD im 4-Bit-Interfacemodus
-// http://www.mikrocontroller.net/articles/AVR-GCC-Tutorial/LCD-Ansteuerung
-//
-void lcd_data(unsigned char temp1);
-void lcd_string(char *data);
-void lcd_command(unsigned char temp1);
-void lcd_enable(void);
-void lcd_init(void);
-void lcd_home(void);
-void lcd_clear(void);
-void set_cursor(uint8_t x, uint8_t y);
- 
-// Hier die verwendete Taktfrequenz in Hz eintragen, wichtig!
- 
-#define F_CPU 8000000
- 
-// LCD Befehle
- 
-#define CLEAR_DISPLAY 0x01
-#define CURSOR_HOME   0x02
- 
-// Pinbelegung für das LCD, an verwendete Pins anpassen
- 
-#define LCD_PORT      PORTB
-#define LCD_DDR       DDRB
-#define LCD_RS        PB4
-#define LCD_EN        PB5
-// DB4 bis DB7 des LCD sind mit PD0 bis PD3 des AVR verbunden
-
-#endif //LCD_H
diff --git a/examples/board_charlcd/charlcd.c b/examples/board_charlcd/charlcd.c
deleted file mode 100644
index 3692754..0000000
--- a/examples/board_charlcd/charlcd.c
+++ /dev/null
@@ -1,228 +0,0 @@
-#include <stdlib.h>
-#include <stdio.h>
-#include <libgen.h>
-
-#include "sim_avr.h"
-#include "avr_ioport.h"
-#include "sim_elf.h"
-#include "sim_gdb.h"
-#include "sim_vcd_file.h"
-
-#include <GL/gl.h>
-#include <GL/glu.h>
-#include <pthread.h>
-
-#include "SDL.h"
-#include "SDL_image.h"
-
-#include "ac_input.h"
-#include "hd44780.h"
-#include "hd44780_glut.h"
-
-/* screen width, height, and bit depth */
-#define SCREEN_WIDTH  800
-#define SCREEN_HEIGHT 600
-#define SCREEN_BPP     16
-
-int window;
-avr_t * avr = NULL;
-avr_vcd_t vcd_file;
-ac_input_t ac_input;
-hd44780_t hd44780;
-
-SDL_Surface *surface;
-
-static void * avr_run_thread( ){
-    while(1){
-        avr_run(avr);
-    }
-}
-
-void Quit( int returnCode )
-{
-    SDL_Quit( );
-    exit( returnCode );
-}
-
-int resizeWindow( int width, int height )
-{
-    if ( height == 0 ) height = 1;
-    glViewport( 0, 0, ( GLsizei )width, ( GLsizei )height );
-    glMatrixMode( GL_PROJECTION );
-    glLoadIdentity( );
-	glOrtho(0, 800, 0, 600, 0, 10);
-
-    glMatrixMode( GL_MODELVIEW );
-    glLoadIdentity( );
-
-    return 1;
-}
-
-void handleKeyPress( SDL_keysym *keysym )
-{
-    switch ( keysym->sym )
-	{
-	case SDLK_ESCAPE:
-	    Quit( 0 );
-	    break;
-	case SDLK_F1:
-	    SDL_WM_ToggleFullScreen( surface );
-	    break;
-	default:
-	    break;
-	}
-}
-
-int initGL( GLvoid )
-{
-    glEnable( GL_TEXTURE_2D );
-    glShadeModel( GL_SMOOTH );
-
-    glClearColor( 0.8f, 0.8f, 0.8f, 1.0f );
-    glColor4f( 1.0f,1.0f,1.0f,1.0f);
-    glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
-    glEnable( GL_BLEND);
-
-    glClearDepth( 1.0f );
-
-    glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
-
-    hd44780_gl_init();
-
-    return 1;
-}
-
-int drawGLScene( GLvoid )
-{
-    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
-	glMatrixMode(GL_MODELVIEW); // Select modelview matrix
-    glPushMatrix();
-	glLoadIdentity(); // Start with an identity matrix
-    glScalef(3,3,1);
-    glTranslatef( 89.66f,150,0);
-    hd44780_gl_draw( &hd44780 );
-    glPopMatrix();
-    SDL_GL_SwapBuffers();
-    return 1;
-}
-
-
-int main(int argc, char *argv[])
-{
-	elf_firmware_t f;
-	const char * fname =  "atmega48_charlcd.axf";
-	char path[256];
-	sprintf(path, "%s/%s", dirname(argv[0]), fname);
-	printf("Firmware pathname is %s\n", path);
-	elf_read_firmware(path, &f);
-
-	printf("firmware %s f=%d mmcu=%s\n", fname, (int)f.frequency, f.mmcu);
-
-	avr = avr_make_mcu_by_name(f.mmcu);
-	if (!avr) {
-		fprintf(stderr, "%s: AVR '%s' now known\n", argv[0], f.mmcu);
-		exit(1);
-	}
-
-    avr_init(avr);
-    avr_load_firmware(avr,&f);
-    ac_input_init(avr, &ac_input);
-    avr_connect_irq(
-        ac_input.irq + IRQ_AC_OUT,
-        avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('D'),2));
-
-    hd44780_init(avr, &hd44780);
-/*    hd44780_print2x16(&hd44780); */
-
-    /* Connect Data Lines to Port B, 0-3 */
-    for( int i =0; i<4;i++){ 
-        avr_irq_register_notify(
-            avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), i),
-            hd44780_data_changed_hook,
-            &hd44780);
-    }
-    /* Connect Cmd Lines */
-    for( int i =4; i<7;i++){ 
-        avr_irq_register_notify(
-            avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), i),
-            hd44780_cmd_changed_hook,
-            &hd44780);
-    }
-
-	avr_vcd_init(avr, "gtkwave_output.vcd", &vcd_file, 100 /* usec */);
-	avr_vcd_add_signal(&vcd_file, 
-		avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), IOPORT_IRQ_PIN_ALL), 8 /* bits */ ,
-		"portb" );
-
-    avr_vcd_add_signal(&vcd_file,
-        ac_input.irq + IRQ_AC_OUT, 1, "ac_input");
-
-    avr_vcd_start(&vcd_file);
-
-    //avr_gdb_init(avr);
-    //avr->state = cpu_Stopped;
-
-
-    avr_vcd_stop(&vcd_file);
-
-
-    if ( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
-	    fprintf( stderr, "Video initialization failed: %s\n",SDL_GetError( ) );
-	    Quit( 1 );
-	}
-    int done =0, isActive=1;
-    SDL_Event event;
-    int videoFlags = SDL_OPENGL | SDL_GL_DOUBLEBUFFER | SDL_HWPALETTE | SDL_RESIZABLE | SDL_HWSURFACE | SDL_HWACCEL;
-    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
-    surface = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP, videoFlags );
-    SDL_WM_SetCaption("HD44780 Simulation","");
-    if( !surface ) {
-        fprintf( stderr,  "Video mode set failed: %s\n", SDL_GetError( ) );
-	    Quit( 1 );
-	}
-    initGL( );
-    resizeWindow( SCREEN_WIDTH, SCREEN_HEIGHT);
-
-    pthread_t run;
-    pthread_create(&run, NULL, avr_run_thread, NULL);
-
-    while(!done){
-	    while ( SDL_PollEvent( &event ) )
-		{
-		    switch( event.type )
-			{
-			case SDL_ACTIVEEVENT:
-			    if ( event.active.gain == 0 )
-				isActive = 0;
-			    else
-				isActive = 1;
-			    break;			    
-			case SDL_VIDEORESIZE:
-			    /* handle resize event */
-			    surface = SDL_SetVideoMode( event.resize.w,
-							event.resize.h,
-							16, videoFlags );
-			    if ( !surface )
-				{
-				    fprintf( stderr, "Could not get a surface after resize: %s\n", SDL_GetError( ) );
-				    Quit( 1 );
-				}
-			    resizeWindow( event.resize.w, event.resize.h );
-			    break;
-			case SDL_KEYDOWN:
-			    /* handle key presses */
-			    handleKeyPress( &event.key.keysym );
-			    break;
-			case SDL_QUIT:
-			    /* handle quit requests */
-			    done = 1;
-			    break;
-			default:
-			    break;
-			}
-		}
-        drawGLScene();
-    }
-    return 0;
-
-}
diff --git a/examples/board_charlcd/hd44780.c b/examples/board_charlcd/hd44780.c
deleted file mode 100644
index 46178e8..0000000
--- a/examples/board_charlcd/hd44780.c
+++ /dev/null
@@ -1,185 +0,0 @@
-#include "hd44780.h"
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdarg.h>
-
-void debug_print( const char* format, ... ) {
-
-    va_list args;
-    va_start( args, format );
-    #ifdef HD44780_DEBUG
-    vprintf( format, args );
-    #endif
-    va_end( args );
-}
-
-int check_flag( hd44780_t *b, int flag){
-    return (b->flags>>flag)&1;
-}
-
-void reset_cursor( hd44780_t *b){
-    b->cursor = b->ddram;
-}
-
-void clear_screen( hd44780_t *b){
-    memset(b->ddram,' ',80);
-}
-
-void handle_function_8bit( hd44780_t *b, int realportstate ){
-    debug_print("handle_function_8bit  realportstate 0x%x\n",realportstate);
-    /*
-    if( realportstate == 0x22){
-        debug_print("Activating 4Bit Mode\n");
-        b->mode_4bit = 1;
-    }
-    */
-    if( realportstate == 1) {
-        clear_screen(b);
-        debug_print("Clear Screen\n");
-    }
-    if( realportstate >> 1 == 1) {
-        debug_print("Move Cursor to startpos\n");
-        reset_cursor(b);
-    }
-    if( realportstate >> 2 == 1) {
-        debug_print("Setting I/S mode\n");
-        b->flags &= ~(3<<HD44780_FLAG_S); //Clear S, I/D bits
-        b->flags |= (realportstate & 3)<<HD44780_FLAG_S;
-    }
-    if( realportstate >> 3 == 1) {
-        debug_print("Setting Display/Cursor Mode\n");
-        b->flags &= ~(7<<HD44780_FLAG_B); //Clear B,C,D bits
-        b->flags |= realportstate&7 << HD44780_FLAG_B; // Set B,C,D bits
-    }
-    if( realportstate >> 4 == 1) {
-        debug_print("Moving Display/Cursor Mode\n");
-        b->flags &= ~(3<<HD44780_FLAG_R_L); //Clear R/L,S/C
-        b->flags |= (realportstate & 3)<<HD44780_FLAG_R_L;
-    }
-    if( realportstate >> 5 == 1) {
-        debug_print("Functions\n");
-        b->flags &= ~(7<<HD44780_FLAG_F); //Clear F,N,DL bits
-        b->flags |= (realportstate>>2)&7 << HD44780_FLAG_F; // Set F,N,DL bits
-        if( !check_flag(b, HD44780_FLAG_D_L) ){
-            debug_print("Enabling 4Bit Mode\n");
-            b->mode_4bit = 1;  
-        }
-    }
-    if( realportstate >> 6 == 1) printf("Set CGRAM Address\n");
-    if( realportstate >> 7 == 1) {
-        debug_print("Set DDRAM Address\n");
-        b->cursor = b->ddram + (realportstate & 0x7f);
-    }
-    debug_print("Flags are 0x%x\n",b->flags);
-}
-
-void handle_data_8bit( hd44780_t *b, int realportstate ){
-    /* printf("handle_data_8bit realportstate 0x%x\n",realportstate); */
-    *(b->cursor) = realportstate & 0xff;
-    if( !check_flag(b, HD44780_FLAG_S_C) ){
-        // Move Cursor
-        if( check_flag(b, HD44780_FLAG_I_D) ){
-            b->cursor++;
-        }
-        else{
-            b->cursor--;
-        }
-    }
-    else {
-        printf("!! NOT IMPLEMENTED\n");
-        // Move Display
-        if( check_flag(b, HD44780_FLAG_R_L) ){
-            //Move right
-            
-        }
-        else {
-            // Move left
-        }
-    }
-    if( b->cursor < b->ddram || b->cursor > b->ddram+80){
-        debug_print("Cursor out of range!\n");
-        reset_cursor(b);
-    }
-    #ifdef HD44780_DEBUG
-    hd44780_print2x16( b );
-    #endif 
-}
-
-void hd44780_init( struct avr_t *avr, struct hd44780_t * b) {
-    b->irq = avr_alloc_irq(0,IRQ_HD44780_COUNT);
-    b->portstate = 0x00;
-    b->mode_4bit = 0;
-    b->four_bit_cache = 0;
-    b->inits_recv = 0;
-    b->flags = 0;
-    reset_cursor(b);
-    clear_screen(b);
-}
-
-void hd44780_print2x16( struct hd44780_t *b){
-    printf("/******************\\\n| ");
-    fwrite( b->ddram, 1, 16, stdout);
-    printf(" |\n| ");
-//    fputc('\n',stdout);
-    fwrite( b->ddram + 0x40, 1, 16, stdout);
-    printf(" |\n\\******************/\n");
-}
-
-void hd44780_data_changed_hook( struct avr_irq_t * irq, uint32_t value, void *param){
-    hd44780_t *b = (hd44780_t *)param;
-    int datapos = -1;
-    if( irq->irq == DATA_PIN_0) datapos = 0;
-    if( irq->irq == DATA_PIN_1) datapos = 1;
-    if( irq->irq == DATA_PIN_2) datapos = 2;
-    if( irq->irq == DATA_PIN_3) datapos = 3;
-    if( irq->irq == DATA_PIN_4) datapos = 4;
-    if( irq->irq == DATA_PIN_5) datapos = 5;
-    if( irq->irq == DATA_PIN_6) datapos = 6;
-    if( irq->irq == DATA_PIN_7) datapos = 7;
-    if( datapos >= 0){
-        if( value == 1) b->portstate |= 1<<datapos;
-        else b->portstate &= ~(1<<datapos);
-    }
-}
-
-
-void hd44780_cmd_changed_hook( struct avr_irq_t * irq, uint32_t value, void *param){
-    hd44780_t *b = (hd44780_t *)param;
-    if( irq->irq == RS_PIN){
-        b->rs=value;
-    }
-    if( irq->irq == RW_PIN){
-        b->rw=value;
-    }
-    if( irq->irq == ENABLE_PIN && value == 0){
-        debug_print("enable pulse! portstate 0x%x\n", b->portstate);
-        if( b->inits_recv < 3 ){
-            if( b->portstate == 0x30 ){
-                debug_print("Init received\n");
-                b->inits_recv++;
-            }
-            else debug_print("Uuups, received command before fully initialized?\n");
-        }
-        else {
-            int realportstate=0;
-            int received = 1;
-            if( b->mode_4bit == 1) b->four_bit_cache = b->portstate, b->mode_4bit++,received=0;
-            else if( b->mode_4bit == 2) {
-                realportstate = (b->four_bit_cache&0xf0) | (b->portstate&0xf0)>>4;
-                b->mode_4bit=1;
-            }
-            else realportstate = b->portstate;
-            debug_print("four bit cache is 0x%x\n",b->four_bit_cache);
-
-            if(received){
-                if( !b->rs ) handle_function_8bit( b, realportstate );
-                else handle_data_8bit( b, realportstate );
-            }
-        }
-    }
-//    printf("pin %i is now %i, portstate 0x%x\n", irq->irq, value, b->portstate);
-}
-
-
-
diff --git a/examples/board_charlcd/hd44780.h b/examples/board_charlcd/hd44780.h
deleted file mode 100644
index 4b4ce12..0000000
--- a/examples/board_charlcd/hd44780.h
+++ /dev/null
@@ -1,69 +0,0 @@
-#ifndef __HD44780_H__
-#define __HD44780_H__
-
-#include "sim_irq.h"
-
-/******************
- * Simulates a HD44780 controlled character LED.
- * All the Data Pins have to be on the same Port.
- * All the Cmd Pins have to be on the same Port. In 4 Bit mode,
- * they can share one Port.
- * For output of the display contents, use hd44780_print2x16 or a opengl function.
- ******************/
-
-#define ENABLE_PIN 5
-#define RW_PIN 6
-#define RS_PIN 4
-/* Use -1 for not connected */
-#define DATA_PIN_0 -1
-#define DATA_PIN_1 -1
-#define DATA_PIN_2 -1
-#define DATA_PIN_3 -1
-#define DATA_PIN_4 0
-#define DATA_PIN_5 1
-#define DATA_PIN_6 2
-#define DATA_PIN_7 3
-
-/* #define HD44780_DEBUG */
-
-enum {
-    HD44780_FLAG_F = 0,         //5x7 Font, 5x10 Font
-    HD44780_FLAG_N,             //1-zeiliges Display, 2/4-zeiliges Display
-    HD44780_FLAG_D_L,           //4-Bit Interface, 8-Bit Interface
-    HD44780_FLAG_R_L,           // Nach links schieben,Nach rechts schieben
-    HD44780_FLAG_S_C,           //Cursor bewegen, Displayinhalt schieben
-    HD44780_FLAG_B,             //Cursor blinkt nicht, Cursor blinkt
-    HD44780_FLAG_C,             //Cursor aus,Cursor an
-    HD44780_FLAG_D,             //Display aus,Display an
-    HD44780_FLAG_S,             //Displayinhalt fest, Displayinhalt weiterschieben
-    HD44780_FLAG_I_D 
-};
-
-enum {
-    IRQ_HD44780_IN = 0,
-    IRQ_HD44780_COUNT
-};
-
-
-typedef struct hd44780_t {
-    avr_irq_t * irq;
-    struct avr_t * avr;
-    char *cursor;
-    char ddram[80];
-    char cgram[64];
-    uint32_t rw;            /* R/W pin */
-    uint32_t rs;            /* RS pin */
-    int portstate;
-    char mode_4bit;     /* 0=disabled, 1=waitingforfirstnibble, 2=waitingforsecondnibble */
-    uint32_t flags;
-    int four_bit_cache;
-    char inits_recv;    /* num of init sequences received */
-} hd44780_t;
-
-void hd44780_init( struct avr_t *avr, struct hd44780_t * b);
-void hd44780_print2x16( struct hd44780_t *b);
-
-void hd44780_data_changed_hook( struct avr_irq_t * irq, uint32_t value, void *param);
-void hd44780_cmd_changed_hook( struct avr_irq_t * irq, uint32_t value, void *param);
-
-#endif 
diff --git a/examples/board_charlcd/hd44780_glut.c b/examples/board_charlcd/hd44780_glut.c
deleted file mode 100644
index 4f9dee8..0000000
--- a/examples/board_charlcd/hd44780_glut.c
+++ /dev/null
@@ -1,94 +0,0 @@
-#include "hd44780_glut.h"
-
-#include "SDL.h"
-#include "SDL_image.h"
-#include <GL/gl.h>
-#include <GL/glu.h>
-
-static GLuint font_texture;
-static int charwidth = 5;
-static int charheight = 7;
-
-void hd44780_gl_init(){
-    SDL_Surface *image;
-    image = IMG_Load("font.tiff");
-    if( !image) {
-        printf("Problem loading texture\n");
-        return;
-    }
-    glGenTextures(1,&font_texture);
-    glBindTexture(GL_TEXTURE_2D, font_texture);
-/*    printf("imagew %i, imageh %i, bytesperpixel %i\n", image->w, image->h, image->format->BytesPerPixel); */
-    glTexImage2D( GL_TEXTURE_2D, 0, 4, image->w, image->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
-	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-
-    glMatrixMode(GL_TEXTURE);
-    glLoadIdentity();
-    glScalef( 1.0f/(GLfloat)image->w, 1.0f/(GLfloat)image->h,1.0f);
-
-    SDL_FreeSurface(image);
-    glMatrixMode(GL_MODELVIEW);
-}
-
-void glputchar(char c){
-    int index = c;
-    int left = index * charwidth;
-    int right = index*charwidth+charwidth;
-    int top = 0;
-    int bottom =7;
-    
-    glDisable(GL_TEXTURE_2D);
-    glColor3f( 0.0f, 1.0f, 0.0f);
-    glBegin( GL_QUADS);
-       glVertex3i(  5, 7, 0 ); 
-       glVertex3i(  0, 7, 0 ); 
-       glVertex3i(  0, 0, 0 ); 
-      glVertex3i(   5, 0, 0 ); 
-    glEnd( );                           
-
-    glEnable(GL_TEXTURE_2D);
-    glColor3f( 1.0f, 1.0f, 1.0f);
-    glBindTexture(GL_TEXTURE_2D, font_texture);
-    glBegin( GL_QUADS);
-      glTexCoord2i(right,top);      glVertex3i(  5, 7, 0 ); 
-      glTexCoord2i(left, top);      glVertex3i(  0, 7, 0 ); 
-      glTexCoord2i(left, bottom);   glVertex3i(  0, 0, 0 ); 
-      glTexCoord2i(right,bottom);  glVertex3i(   5, 0, 0 ); 
-    glEnd( );                           
-
-}
-
-void glputstr( char *str){
-    while( *(++str) != 0 ){
-        glputchar(*str);
-        glTranslatef(6,0,0);
-    }
-}
-
-void hd44780_gl_draw( hd44780_t *b){
-    int rows = 16;
-    int lines = 2;
-    int border = 3;
-    glDisable(GL_TEXTURE_2D);
-    glColor3f(0.0f,0.4f,0.0f);
-    glTranslatef(0,-8,0);
-    glBegin(GL_QUADS);
-        glVertex3f( rows*charwidth + (rows-1) + border, -border,0);
-        glVertex3f( - border, -border,0);
-        glVertex3f( - border, lines*charheight + (lines-1)+border,0);
-        glVertex3f( rows*charwidth + (rows-1) + border, lines*charheight + (lines-1)+border,0);
-    glEnd();
-    glTranslatef(0,8,0);
-    glColor3f(1.0f,1.0f,1.0f);
-    for( int i=0; i<16; i++) {
-        glputchar( b->ddram[i] );
-        glTranslatef(6,0,0);
-    }
-    glTranslatef(-96,-8,0);
-    for( int i=0; i<16; i++) {
-        glputchar( b->ddram[i+0x40] );
-        glTranslatef(6,0,0);
-    }
-    
-}
diff --git a/examples/board_charlcd/hd44780_glut.h b/examples/board_charlcd/hd44780_glut.h
deleted file mode 100644
index 53d9403..0000000
--- a/examples/board_charlcd/hd44780_glut.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef __HD44780_GLUT_H__
-#define __HD44780_GLUT_H__
-
-#include "hd44780.h"
-
-void hd44780_gl_draw( hd44780_t *b);
-
-void hd44780_gl_init();
-
-#endif
diff --git a/examples/board_charlcd/Makefile b/examples/board_hd77480/Makefile
similarity index 63%
rename from examples/board_charlcd/Makefile
rename to examples/board_hd77480/Makefile
index 8da9583..04a18d5 100644
--- a/examples/board_charlcd/Makefile
+++ b/examples/board_hd77480/Makefile
@@ -1,5 +1,5 @@
 # 
-# 	Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
+# 	Copyright 2008-2011 Michel Pollet <buserror@gmail.com>
 #
 #	This file is part of simavr.
 #
@@ -32,30 +32,15 @@ VPATH = .
 VPATH += ../parts
 
 LDFLAGS += -lpthread
-LDFLAGS += -lGLU
-LDFLAGS += -lGL
-LDFLAGS += `sdl-config --libs`
-LDFLAGS += -lSDL_image
+ifneq (${shell uname}, Darwin)
+LDFLAGS += -lGL -lglut
+else
+LDFLAGS += -framework GLUT -framework OpenGL 
+endif
 
-CFLAGS = `sdl-config --cflags`
-#ifneq (${shell uname}, Darwin)
-#else
-#LDFLAGS += -framework GLUT -framework OpenGL 
-#endif
 all: obj atmega48_charlcd.axf ${board} 
 
-atmega48_charlcd.axf: atmega48_charlcd.c atmega48_lcd.c atmega48_lcd.h
-	@echo AVR-CC ${<}
-	${AVR}gcc -Wall -gdwarf-2 -Os -std=gnu99 \
-			-mmcu=atmega48 \
-			-DF_CPU=8000000 \
-			-fno-inline-small-functions \
-			-ffunction-sections -fdata-sections \
-			-Wl,--relax,--gc-sections \
-			-Wl,--undefined=_mmcu,--section-start=.mmcu=0x910000 \
-			-I../include -I../../include \
-			atmega48_charlcd.c atmega48_lcd.c -o atmega48_charlcd.axf
-	@${AVR}size ${@}|sed '1d'
+atmega48_charlcd.axf: atmega48_charlcd.c
 
 include ${simavr}/Makefile.common
 
diff --git a/examples/board_hd77480/README b/examples/board_hd77480/README
new file mode 100644
index 0000000..0ef3b59
--- /dev/null
+++ b/examples/board_hd77480/README
@@ -0,0 +1,21 @@
+board_hd44780
+
+(C) 2011 Michel Pollet <buserror@gmail.com>
+With thanks to Luki <humbell@ethz.ch>
+
+This sample code is derivated from a patch sent by Luki, however it was mostly
+in german, and was usinf the SDL library. Also the implementation of the LCD
+itself had several shortcomings.
+
+Therefore it was almost entirely rewritten from scratch the LCD was extended
+and made as compliant as it is practical, and the sample code itself was
+stripped of SDL. Also the german AVR LCD driver was replaced with the 
+avr-libc one, a much more complete one.
+
+This example demonstrated how to write a "part' that provide both a way to
+visualize what your code is doing, but also provide extra data you can
+visualize in gtkwave; so the LCD "part" exports quite a few IRQs that can
+be used to help you trace and debug your own code.
+
+Make sure to run this program and visualize the pretty curves.
+ 
\ No newline at end of file
diff --git a/examples/board_hd77480/atmega48_charlcd.c b/examples/board_hd77480/atmega48_charlcd.c
new file mode 100644
index 0000000..95c1e96
--- /dev/null
+++ b/examples/board_hd77480/atmega48_charlcd.c
@@ -0,0 +1,114 @@
+/*
+	atmega48_charlcd.c
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#undef F_CPU
+#define F_CPU 10000000
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/sleep.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+//#include "avr_defines.h"
+
+#include "avr_mcu_section.h"
+AVR_MCU(F_CPU, "atmega48");
+
+static uint8_t subsecct = 0;
+static uint8_t hour = 0;
+static uint8_t minute = 0;
+static uint8_t second = 0;
+static volatile uint8_t update_needed = 0;
+
+#include "avr_hd44780.c"
+
+ISR( INT0_vect )
+{
+	/* External interrupt on pin D2 */
+	subsecct++;
+	if (subsecct == 50) {
+		second++;
+		subsecct = 0;
+		update_needed = 1;
+		if (second == 60) {
+			minute++;
+			second = 0;
+			if (minute == 60) {
+				minute = 0;
+				hour++;
+				if (hour == 24)
+					hour = 0;
+			}
+		}
+	}
+}
+
+int main()
+{
+	hd44780_init();
+	/*
+	 * Clear the display.
+	 */
+	hd44780_outcmd(HD44780_CLR);
+	hd44780_wait_ready(1); // long wait
+
+	/*
+	 * Entry mode: auto-increment address counter, no display shift in
+	 * effect.
+	 */
+	hd44780_outcmd(HD44780_ENTMODE(1, 0));
+	hd44780_wait_ready(0);
+
+	/*
+	 * Enable display, activate non-blinking cursor.
+	 */
+	hd44780_outcmd(HD44780_DISPCTL(1, 1, 0));
+	hd44780_wait_ready(0);
+
+	EICRA = (1 << ISC00);
+	EIMSK = (1 << INT0);
+
+	sei();
+
+	while (1) {
+		while (!update_needed)
+			sleep_mode();
+		update_needed = 0;
+		char buffer[16];
+
+		hd44780_outcmd(HD44780_CLR);
+		hd44780_wait_ready(1); // long wait
+		hd44780_outcmd(HD44780_DDADDR(4));
+		hd44780_wait_ready(0);
+		sprintf(buffer, "%2d:%02d:%02d", hour, minute, second);
+
+		char *s = buffer;
+		while (*s) {
+			hd44780_outdata(*s++);
+			hd44780_wait_ready(0);
+		}
+	}
+
+}
diff --git a/examples/board_hd77480/avr_hd44780.c b/examples/board_hd77480/avr_hd44780.c
new file mode 100644
index 0000000..7901fa5
--- /dev/null
+++ b/examples/board_hd77480/avr_hd44780.c
@@ -0,0 +1,216 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <joerg@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.        Joerg Wunsch
+ * ----------------------------------------------------------------------------
+ *
+ * HD44780 LCD display driver
+ *
+ * The LCD controller is used in 4-bit mode with a full bi-directional
+ * interface (i.e. R/~W is connected) so the busy flag can be read.
+ *
+ * $Id: hd44780.c 2002 2009-06-25 20:21:16Z joerg_wunsch $
+ */
+
+#include "avr_hd44780_conf.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <avr/io.h>
+#include <util/delay.h>
+
+#include "avr_hd44780.h"
+
+#define GLUE(a, b)     a##b
+
+/* single-bit macros, used for control bits */
+#define SET_(what, p, m) GLUE(what, p) |= (1 << (m))
+#define CLR_(what, p, m) GLUE(what, p) &= ~(1 << (m))
+#define GET_(/* PIN, */ p, m) GLUE(PIN, p) & (1 << (m))
+#define SET(what, x) SET_(what, x)
+#define CLR(what, x) CLR_(what, x)
+#define GET(/* PIN, */ x) GET_(x)
+
+/* nibble macros, used for data path */
+#define ASSIGN_(what, p, m, v) GLUE(what, p) = (GLUE(what, p) & \
+						~((1 << (m)) | (1 << ((m) + 1)) | \
+						  (1 << ((m) + 2)) | (1 << ((m) + 3)))) | \
+					        ((v) << (m))
+#define READ_(what, p, m) (GLUE(what, p) & ((1 << (m)) | (1 << ((m) + 1)) | \
+					    (1 << ((m) + 2)) | (1 << ((m) + 3)))) >> (m)
+#define ASSIGN(what, x, v) ASSIGN_(what, x, v)
+#define READ(what, x) READ_(what, x)
+
+#define HD44780_BUSYFLAG 0x80
+
+/*
+ * Send one pulse to the E signal (enable).  Mind the timing
+ * constraints.  If readback is set to true, read the HD44780 data
+ * pins right before the falling edge of E, and return that value.
+ */
+static inline uint8_t
+hd44780_pulse_e(bool readback) __attribute__((always_inline));
+
+static inline uint8_t
+hd44780_pulse_e(bool readback)
+{
+  uint8_t x;
+
+  SET(PORT, HD44780_E);
+  /*
+   * Guarantee at least 500 ns of pulse width.  For high CPU
+   * frequencies, a delay loop is used.  For lower frequencies, NOPs
+   * are used, and at or below 1 MHz, the native pulse width will
+   * already be 1 us or more so no additional delays are needed.
+   */
+#if F_CPU > 4000000UL
+  _delay_us(0.5);
+#else
+  /*
+   * When reading back, we need one additional NOP, as the value read
+   * back from the input pin is sampled close to the beginning of a
+   * CPU clock cycle, while the previous edge on the output pin is
+   * generated towards the end of a CPU clock cycle.
+   */
+  if (readback)
+    __asm__ volatile("nop");
+#  if F_CPU > 1000000UL
+  __asm__ volatile("nop");
+#    if F_CPU > 2000000UL
+  __asm__ volatile("nop");
+  __asm__ volatile("nop");
+#    endif /* F_CPU > 2000000UL */
+#  endif /* F_CPU > 1000000UL */
+#endif
+  if (readback)
+    x = READ(PIN, HD44780_D4);
+  else
+    x = 0;
+  CLR(PORT, HD44780_E);
+
+  return x;
+}
+
+/*
+ * Send one nibble out to the LCD controller.
+ */
+static void
+hd44780_outnibble(uint8_t n, uint8_t rs)
+{
+  CLR(PORT, HD44780_RW);
+  if (rs)
+    SET(PORT, HD44780_RS);
+  else
+    CLR(PORT, HD44780_RS);
+  ASSIGN(PORT, HD44780_D4, n);
+  (void)hd44780_pulse_e(false);
+}
+
+/*
+ * Send one byte to the LCD controller.  As we are in 4-bit mode, we
+ * have to send two nibbles.
+ */
+void
+hd44780_outbyte(uint8_t b, uint8_t rs)
+{
+  hd44780_outnibble(b >> 4, rs);
+  hd44780_outnibble(b & 0xf, rs);
+}
+
+/*
+ * Read one nibble from the LCD controller.
+ */
+static uint8_t
+hd44780_innibble(uint8_t rs)
+{
+  uint8_t x;
+
+  SET(PORT, HD44780_RW);
+  ASSIGN(DDR, HD44780_D4, 0x00);
+  if (rs)
+    SET(PORT, HD44780_RS);
+  else
+    CLR(PORT, HD44780_RS);
+  x = hd44780_pulse_e(true);
+  ASSIGN(DDR, HD44780_D4, 0x0F);
+  CLR(PORT, HD44780_RW);
+
+  return x;
+}
+
+/*
+ * Read one byte (i.e. two nibbles) from the LCD controller.
+ */
+uint8_t
+hd44780_inbyte(uint8_t rs)
+{
+  uint8_t x;
+
+  x = hd44780_innibble(rs) << 4;
+  x |= hd44780_innibble(rs);
+
+  return x;
+}
+
+/*
+ * Wait until the busy flag is cleared.
+ */
+void
+hd44780_wait_ready(bool longwait)
+{
+#if USE_BUSY_BIT
+  while (hd44780_incmd() & HD44780_BUSYFLAG) ;
+#else
+  if (longwait)
+    _delay_ms(1.52);
+  else
+    _delay_us(37);
+#endif
+}
+
+/*
+ * Initialize the LCD controller.
+ *
+ * The initialization sequence has a mandatory timing so the
+ * controller can safely recognize the type of interface desired.
+ * This is the only area where timed waits are really needed as
+ * the busy flag cannot be probed initially.
+ */
+void
+hd44780_init(void)
+{
+  SET(DDR, HD44780_RS);
+  SET(DDR, HD44780_RW);
+  SET(DDR, HD44780_E);
+  ASSIGN(DDR, HD44780_D4, 0x0F);
+
+  _delay_ms(15);		/* 40 ms needed for Vcc = 2.7 V */
+  hd44780_outnibble(HD44780_FNSET(1, 0, 0) >> 4, 0);
+  _delay_ms(4.1);
+  hd44780_outnibble(HD44780_FNSET(1, 0, 0) >> 4, 0);
+  _delay_ms(0.1);
+  hd44780_outnibble(HD44780_FNSET(1, 0, 0) >> 4, 0);
+  _delay_us(40); /* 37 is too short */
+
+  hd44780_outnibble(HD44780_FNSET(0, 1, 0) >> 4, 0);
+  hd44780_wait_ready(false);
+  hd44780_outcmd(HD44780_FNSET(0, 1, 0));
+  hd44780_wait_ready(false);
+  hd44780_outcmd(HD44780_DISPCTL(0, 0, 0));
+  hd44780_wait_ready(false);
+}
+
+/*
+ * Prepare the LCD controller pins for powerdown.
+ */
+void
+hd44780_powerdown(void)
+{
+  ASSIGN(PORT, HD44780_D4, 0);
+  CLR(PORT, HD44780_RS);
+  CLR(PORT, HD44780_RW);
+  CLR(PORT, HD44780_E);
+}
diff --git a/examples/board_hd77480/avr_hd44780.h b/examples/board_hd77480/avr_hd44780.h
new file mode 100644
index 0000000..6d3d978
--- /dev/null
+++ b/examples/board_hd77480/avr_hd44780.h
@@ -0,0 +1,105 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <joerg@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.        Joerg Wunsch
+ * ----------------------------------------------------------------------------
+ *
+ * HD44780 LCD display driver
+ *
+ * $Id: hd44780.h 2002 2009-06-25 20:21:16Z joerg_wunsch $
+ */
+
+/*
+ * Send byte b to the LCD.  rs is the RS signal (register select), 0
+ * selects instruction register, 1 selects the data register.
+ */
+void	hd44780_outbyte(uint8_t b, uint8_t rs);
+
+/*
+ * Read one byte from the LCD controller.  rs is the RS signal, 0
+ * selects busy flag (bit 7) and address counter, 1 selects the data
+ * register.
+ */
+uint8_t	hd44780_inbyte(uint8_t rs);
+
+/*
+ * Wait for the busy flag to clear.
+ */
+void	hd44780_wait_ready(bool islong);
+
+/*
+ * Initialize the LCD controller hardware.
+ */
+void	hd44780_init(void);
+
+/*
+ * Prepare the LCD controller pins for powerdown.
+ */
+void	hd44780_powerdown(void);
+
+
+/* Send a command to the LCD controller. */
+#define hd44780_outcmd(n)	hd44780_outbyte((n), 0)
+
+/* Send a data byte to the LCD controller. */
+#define hd44780_outdata(n)	hd44780_outbyte((n), 1)
+
+/* Read the address counter and busy flag from the LCD. */
+#define hd44780_incmd()		hd44780_inbyte(0)
+
+/* Read the current data byte from the LCD. */
+#define hd44780_indata()	hd44780_inbyte(1)
+
+
+/* Clear LCD display command. */
+#define HD44780_CLR \
+	0x01
+
+/* Home cursor command. */
+#define HD44780_HOME \
+	0x02
+
+/*
+ * Select the entry mode.  inc determines whether the address counter
+ * auto-increments, shift selects an automatic display shift.
+ */
+#define HD44780_ENTMODE(inc, shift) \
+	(0x04 | ((inc)? 0x02: 0) | ((shift)? 1: 0))
+
+/*
+ * Selects disp[lay] on/off, cursor on/off, cursor blink[ing]
+ * on/off.
+ */
+#define HD44780_DISPCTL(disp, cursor, blink) \
+	(0x08 | ((disp)? 0x04: 0) | ((cursor)? 0x02: 0) | ((blink)? 1: 0))
+
+/*
+ * With shift = 1, shift display right or left.
+ * With shift = 0, move cursor right or left.
+ */
+#define HD44780_SHIFT(shift, right) \
+	(0x10 | ((shift)? 0x08: 0) | ((right)? 0x04: 0))
+
+/*
+ * Function set.  if8bit selects an 8-bit data path, twoline arranges
+ * for a two-line display, font5x10 selects the 5x10 dot font (5x8
+ * dots if clear).
+ */
+#define HD44780_FNSET(if8bit, twoline, font5x10) \
+	(0x20 | ((if8bit)? 0x10: 0) | ((twoline)? 0x08: 0) | \
+		((font5x10)? 0x04: 0))
+
+/*
+ * Set the next character generator address to addr.
+ */
+#define HD44780_CGADDR(addr) \
+	(0x40 | ((addr) & 0x3f))
+
+/*
+ * Set the next display address to addr.
+ */
+#define HD44780_DDADDR(addr) \
+	(0x80 | ((addr) & 0x7f))
+
diff --git a/examples/board_hd77480/avr_hd44780_conf.h b/examples/board_hd77480/avr_hd44780_conf.h
new file mode 100644
index 0000000..b01bc7d
--- /dev/null
+++ b/examples/board_hd77480/avr_hd44780_conf.h
@@ -0,0 +1,23 @@
+/*
+ * ----------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <joerg@FreeBSD.ORG> wrote this file.  As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return.        Joerg Wunsch
+ * ----------------------------------------------------------------------------
+ *
+ * General stdiodemo defines
+ *
+ * $Id: defines.h 2186 2010-09-22 10:25:15Z aboyapati $
+ */
+
+/* HD44780 LCD port connections */
+#define HD44780_RW B, 6
+#define HD44780_E  B, 5
+#define HD44780_RS B, 4
+/* The data bits have to be not only in ascending order but also consecutive. */
+#define HD44780_D4 B, 0
+
+/* Whether to read the busy flag, or fall back to
+   worst-time delays. */
+#define USE_BUSY_BIT 1
diff --git a/examples/board_hd77480/charlcd.c b/examples/board_hd77480/charlcd.c
new file mode 100644
index 0000000..a7c118d
--- /dev/null
+++ b/examples/board_hd77480/charlcd.c
@@ -0,0 +1,246 @@
+/*
+	charlcd.c
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <libgen.h>
+
+#include "sim_avr.h"
+#include "avr_ioport.h"
+#include "sim_elf.h"
+#include "sim_gdb.h"
+#include "sim_vcd_file.h"
+
+#if __APPLE__
+#include <GLUT/glut.h>
+#else
+#include <GL/glut.h>
+#endif
+#include <pthread.h>
+
+#include "ac_input.h"
+#include "hd44780_glut.h"
+
+
+//float pixsize = 16;
+int window;
+
+avr_t * avr = NULL;
+avr_vcd_t vcd_file;
+ac_input_t ac_input;
+hd44780_t hd44780;
+
+int color = 0;
+uint32_t colors[][4] = {
+		{ 0x00aa00ff, 0x00cc00ff, 0x000000ff, 0x00000055 },	// fluo green
+		{ 0xaa0000ff, 0xcc0000ff, 0x000000ff, 0x00000055 },	// red
+};
+
+static void *
+avr_run_thread(
+		void * ignore)
+{
+	while (1) {
+		avr_run(avr);
+	}
+}
+
+void keyCB(
+		unsigned char key, int x, int y)	/* called on key press */
+{
+	switch (key) {
+		case 'q':
+			avr_vcd_stop(&vcd_file);
+			exit(0);
+			break;
+		case 'r':
+			printf("Starting VCD trace; press 's' to stop\n");
+			avr_vcd_start(&vcd_file);
+			break;
+		case 's':
+			printf("Stopping VCD trace\n");
+			avr_vcd_stop(&vcd_file);
+			break;
+	}
+}
+
+
+void displayCB(void)		/* function called whenever redisplay needed */
+{
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glMatrixMode(GL_MODELVIEW); // Select modelview matrix
+	glPushMatrix();
+	glLoadIdentity(); // Start with an identity matrix
+	glScalef(3, 3, 1);
+
+	hd44780_gl_draw(
+		&hd44780,
+			colors[color][0], /* background */
+			colors[color][1], /* character background */
+			colors[color][2], /* text */
+			colors[color][3] /* shadow */ );
+	glPopMatrix();
+    glutSwapBuffers();
+}
+
+// gl timer. if the lcd is dirty, refresh display
+void timerCB(int i)
+{
+	static int oldstate = -1;
+	// restart timer
+	glutTimerFunc(1000/64, timerCB, 0);
+	glutPostRedisplay();
+}
+
+int
+initGL(int w, int h)
+{
+	// Set up projection matrix
+	glMatrixMode(GL_PROJECTION); // Select projection matrix
+	glLoadIdentity(); // Start with an identity matrix
+	glOrtho(0, w, 0, h, 0, 10);
+	glScalef(1,-1,1);
+	glTranslatef(0, -1 * h, 0);
+
+	glutDisplayFunc(displayCB);		/* set window's display callback */
+	glutKeyboardFunc(keyCB);		/* set window's key callback */
+	glutTimerFunc(1000 / 24, timerCB, 0);
+
+	glEnable(GL_TEXTURE_2D);
+	glShadeModel(GL_SMOOTH);
+
+	glClearColor(0.8f, 0.8f, 0.8f, 1.0f);
+	glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
+
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glEnable(GL_BLEND);
+
+	hd44780_gl_init();
+
+	return 1;
+}
+
+int
+main(
+		int argc,
+		char *argv[])
+{
+	elf_firmware_t f;
+	const char * fname = "atmega48_charlcd.axf";
+	char path[256];
+	sprintf(path, "%s/%s", dirname(argv[0]), fname);
+	printf("Firmware pathname is %s\n", path);
+	elf_read_firmware(path, &f);
+
+	printf("firmware %s f=%d mmcu=%s\n", fname, (int) f.frequency, f.mmcu);
+
+	avr = avr_make_mcu_by_name(f.mmcu);
+	if (!avr) {
+		fprintf(stderr, "%s: AVR '%s' now known\n", argv[0], f.mmcu);
+		exit(1);
+	}
+
+	avr_init(avr);
+	avr_load_firmware(avr, &f);
+	ac_input_init(avr, &ac_input);
+	avr_connect_irq(ac_input.irq + IRQ_AC_OUT, avr_io_getirq(avr,
+	        AVR_IOCTL_IOPORT_GETIRQ('D'), 2));
+
+	hd44780_init(avr, &hd44780, 20, 4);
+
+	/* Connect Data Lines to Port B, 0-3 */
+	/* These are bidirectional too */
+	for (int i = 0; i < 4; i++) {
+		avr_irq_t * iavr = avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), i);
+		avr_irq_t * ilcd = hd44780.irq + IRQ_HD44780_D4 + i;
+		// AVR -> LCD
+		avr_connect_irq(iavr, ilcd);
+		// LCD -> AVR
+		avr_connect_irq(ilcd, iavr);
+	}
+	avr_connect_irq(
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 4),
+			hd44780.irq + IRQ_HD44780_RS);
+	avr_connect_irq(
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 5),
+			hd44780.irq + IRQ_HD44780_E);
+	avr_connect_irq(
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 6),
+			hd44780.irq + IRQ_HD44780_RW);
+
+
+	avr_vcd_init(avr, "gtkwave_output.vcd", &vcd_file, 10 /* usec */);
+	avr_vcd_add_signal(&vcd_file,
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), IOPORT_IRQ_PIN_ALL),
+			4 /* bits */, "D4-D7");
+	avr_vcd_add_signal(&vcd_file,
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 4),
+			1 /* bits */, "RS");
+	avr_vcd_add_signal(&vcd_file,
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 5),
+			1 /* bits */, "E");
+	avr_vcd_add_signal(&vcd_file,
+			avr_io_getirq(avr, AVR_IOCTL_IOPORT_GETIRQ('B'), 6),
+			1 /* bits */, "RW");
+	avr_vcd_add_signal(&vcd_file,
+			hd44780.irq + IRQ_HD44780_BUSY,
+			1 /* bits */, "LCD_BUSY");
+	avr_vcd_add_signal(&vcd_file,
+			hd44780.irq + IRQ_HD44780_ADDR,
+			7 /* bits */, "LCD_ADDR");
+	avr_vcd_add_signal(&vcd_file,
+			hd44780.irq + IRQ_HD44780_DATA_IN,
+			8 /* bits */, "LCD_DATA_IN");
+	avr_vcd_add_signal(&vcd_file,
+			hd44780.irq + IRQ_HD44780_DATA_OUT,
+			8 /* bits */, "LCD_DATA_OUT");
+
+	avr_vcd_add_signal(&vcd_file, ac_input.irq + IRQ_AC_OUT, 1, "ac_input");
+
+	avr_vcd_start(&vcd_file);
+
+	printf( "Demo : This is HD44780 LCD demo\n"
+			"   You can configure the width&height of the LCD in the code\n"
+			"   Press 'r' to start recording a 'wave' file - with a LOT of data\n"
+			"   Press 's' to stop recording\n"
+			);
+
+	/*
+	 * OpenGL init, can be ignored
+	 */
+	glutInit(&argc, argv);		/* initialize GLUT system */
+
+	int w = 5 + hd44780.w * 6;
+	int h = 5 + hd44780.h * 8;
+	int pixsize = 3;
+
+	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+	glutInitWindowSize(w * pixsize, h * pixsize);		/* width=400pixels height=500pixels */
+	window = glutCreateWindow("Press 'q' to quit");	/* create window */
+
+	initGL(w * pixsize, h * pixsize);
+
+	pthread_t run;
+	pthread_create(&run, NULL, avr_run_thread, NULL);
+
+	glutMainLoop();
+}
diff --git a/examples/board_charlcd/data/blu.tiff b/examples/board_hd77480/data/blu.tiff
similarity index 100%
rename from examples/board_charlcd/data/blu.tiff
rename to examples/board_hd77480/data/blu.tiff
diff --git a/examples/board_charlcd/font.tiff b/examples/board_hd77480/data/font.tiff
similarity index 100%
rename from examples/board_charlcd/font.tiff
rename to examples/board_hd77480/data/font.tiff
diff --git a/examples/board_charlcd/data/processblu.py b/examples/board_hd77480/data/processblu.py
similarity index 100%
rename from examples/board_charlcd/data/processblu.py
rename to examples/board_hd77480/data/processblu.py
diff --git a/examples/board_hd77480/font.h b/examples/board_hd77480/font.h
new file mode 100644
index 0000000..7384839
--- /dev/null
+++ b/examples/board_hd77480/font.h
@@ -0,0 +1,1070 @@
+/* GIMP RGBA C-Source image dump (font.c) */
+
+static const struct {
+  unsigned int 	 width;
+  unsigned int 	 height;
+  unsigned int 	 bytes_per_pixel; /* 3:RGB, 4:RGBA */ 
+  char         	*comment;
+  unsigned char	 pixel_data[1280 * 7 * 4 + 1];
+} lcd_font = {
+  1280, 7, 4,
+  "generated with gimp from font,tiff",
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
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+  "\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0"
+  "\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0"
+  "\0\0\377\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0"
+  "\0\0\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0"
+  "\377\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0"
+  "\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0"
+  "\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0"
+  "\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\377\0"
+  "\0\0\377\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0"
+  "\0\377\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0"
+  "\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0"
+  "\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\377"
+  "\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377"
+  "\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377"
+  "\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\0\0"
+  "\0\0\377\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\0"
+  "\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0"
+  "\0\0\377\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377"
+  "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377"
+  "\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0"
+  "\0\0\377\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\377\0\0\0\377\0\0\0\377\0\0"
+  "\0\377\0\0\0\377\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\377\0\0\0\0\0\0"
+  "\0\0\0\0\0\377\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+  "\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377\0\0\0\377",
+};
+
diff --git a/examples/parts/ac_input.c b/examples/parts/ac_input.c
new file mode 100644
index 0000000..a363f6b
--- /dev/null
+++ b/examples/parts/ac_input.c
@@ -0,0 +1,45 @@
+/*
+	ac_input.c
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "sim_avr.h"
+#include "ac_input.h"
+#include "stdio.h"
+
+static avr_cycle_count_t
+switch_auto(struct avr_t * avr,
+        avr_cycle_count_t when, void * param)
+{
+	ac_input_t * b = (ac_input_t *) param;
+	b->value = !b->value;
+	avr_raise_irq(b->irq + IRQ_AC_OUT, b->value);
+	return when + avr_usec_to_cycles(avr, 100000 / 50);
+}
+
+void ac_input_init(struct avr_t *avr, ac_input_t *b)
+{
+	b->irq = avr_alloc_irq(0, IRQ_AC_COUNT);
+	b->avr = avr;
+	b->value = 0;
+	avr_cycle_timer_register_usec(avr, 100000 / 50, switch_auto, b);
+	printf("ac_input_init period %duS or %d cycles\n",
+			100000 / 50, avr_usec_to_cycles(avr, 100000 / 50));
+}
diff --git a/examples/parts/ac_input.h b/examples/parts/ac_input.h
new file mode 100644
index 0000000..1a8b3a5
--- /dev/null
+++ b/examples/parts/ac_input.h
@@ -0,0 +1,49 @@
+/*
+	ac_input.h
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Simulates a 50hz changing signal
+ */
+
+#ifndef __AC_INPUT_H__
+#define __AC_INPUT_H__
+
+#include "sim_irq.h"
+
+
+enum {
+    IRQ_AC_OUT = 0,
+    IRQ_AC_COUNT
+};
+
+typedef struct ac_input_t {
+    avr_irq_t * irq;
+    struct avr_t * avr;
+    uint8_t value;
+} ac_input_t;
+
+void
+ac_input_init(
+			struct avr_t * avr,
+			ac_input_t * b);
+
+#endif
diff --git a/examples/parts/hd44780.c b/examples/parts/hd44780.c
new file mode 100644
index 0000000..f5ed19b
--- /dev/null
+++ b/examples/parts/hd44780.c
@@ -0,0 +1,374 @@
+/*
+	hd44780.c
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "sim_cycle_timers.h"
+
+#include "hd44780.h"
+
+void
+hd44780_print(
+		hd44780_t *b)
+{
+	printf("/******************\\\n");
+	const uint8_t offset[] = { 0, 0x40, 0x20, 0x60 };
+	for (int i = 0; i < b->h; i++) {
+		printf("| ");
+		fwrite(b->vram + offset[i], 1, b->w, stdout);
+		printf(" |\n");
+	}
+	printf("\\******************/\n");
+}
+
+
+static void
+_hd44780_reset_cursor(
+		hd44780_t *b)
+{
+	b->cursor = 0;
+	hd44780_set_flag(b, HD44780_FLAG_DIRTY, 1);
+	avr_raise_irq(b->irq + IRQ_HD44780_ADDR, b->cursor);
+}
+
+static void
+_hd44780_clear_screen(
+		hd44780_t *b)
+{
+	memset(b->vram, ' ', 80);
+	hd44780_set_flag(b, HD44780_FLAG_DIRTY, 1);
+	avr_raise_irq(b->irq + IRQ_HD44780_ADDR, b->cursor);
+}
+
+
+
+/*
+ * This is called when the delay between operation is triggered
+ * without the AVR firmware 'reading' the status byte. It
+ * automatically clears the BUSY flag for the next command
+ */
+static avr_cycle_count_t
+_hd44780_busy_timer(
+		struct avr_t * avr,
+        avr_cycle_count_t when, void * param)
+{
+	hd44780_t *b = (hd44780_t *) param;
+//	printf("%s called\n", __FUNCTION__);
+	hd44780_set_flag(b, HD44780_FLAG_BUSY, 0);
+	avr_raise_irq(b->irq + IRQ_HD44780_BUSY, 0);
+	return 0;
+}
+
+static void
+hd44780_kick_cursor(
+	hd44780_t *b)
+{
+	if (hd44780_get_flag(b, HD44780_FLAG_I_D)) {
+		if (b->cursor < 79)
+			b->cursor++;
+		else if (b->cursor < 80+64-1)
+			b->cursor++;
+	} else {
+		if (b->cursor < 80 && b->cursor)
+			b->cursor--;
+		else if (b->cursor > 80)
+			b->cursor--;
+		hd44780_set_flag(b, HD44780_FLAG_DIRTY, 1);
+		avr_raise_irq(b->irq + IRQ_HD44780_ADDR, b->cursor);
+	}
+}
+
+/*
+ * current data byte is ready in b->datapins
+ */
+static uint32_t
+hd44780_write_data(
+		hd44780_t *b)
+{
+	uint32_t delay = 37; // uS
+	b->vram[b->cursor] = b->datapins;
+	printf("hd44780_write_data %02x\n", b->datapins);
+	if (hd44780_get_flag(b, HD44780_FLAG_S_C)) {	// display shift ?
+		// TODO display shift
+	} else {
+		hd44780_kick_cursor(b);
+	}
+	hd44780_set_flag(b, HD44780_FLAG_DIRTY, 1);
+	return delay;
+}
+
+/*
+ * current command is ready in b->datapins
+ */
+static uint32_t
+hd44780_write_command(
+		hd44780_t *b)
+{
+	uint32_t delay = 37; // uS
+	int top = 7;	// get highest bit set'm
+	while (top)
+		if (b->datapins & (1 << top))
+			break;
+		else top--;
+	printf("hd44780_write_command %02x\n", b->datapins);
+
+	switch (top) {
+		// Set	DDRAM address
+		case 7:		// 1 ADD ADD ADD ADD ADD ADD ADD
+			b->cursor = b->datapins & 0x7f;
+			break;
+		// Set	CGRAM address
+		case 6:		// 0 1 ADD ADD ADD ADD ADD ADD ADD
+			b->cursor = 64 + (b->datapins & 0x3f);
+			break;
+		// Function	set
+		case 5:	{	// 0 0 1 DL N F x x
+			int four = !hd44780_get_flag(b, HD44780_FLAG_D_L);
+			hd44780_set_flag(b, HD44780_FLAG_D_L, b->datapins & 16);
+			hd44780_set_flag(b, HD44780_FLAG_N, b->datapins & 8);
+			hd44780_set_flag(b, HD44780_FLAG_F, b->datapins & 4);
+			if (!four && !hd44780_get_flag(b, HD44780_FLAG_D_L)) {
+				printf("%s activating 4 bits mode\n", __FUNCTION__);
+				hd44780_set_flag(b, HD44780_FLAG_LOWNIBBLE, 0);
+			}
+		}	break;
+		// Cursor display shift
+		case 4:		// 0 0 0 1 S/C R/L x x
+			hd44780_set_flag(b, HD44780_FLAG_S_C, b->datapins & 8);
+			hd44780_set_flag(b, HD44780_FLAG_R_L, b->datapins & 4);
+			break;
+		// Display on/off control
+		case 3:		// 0 0 0 0 1 D C B
+			hd44780_set_flag(b, HD44780_FLAG_D, b->datapins & 4);
+			hd44780_set_flag(b, HD44780_FLAG_C, b->datapins & 2);
+			hd44780_set_flag(b, HD44780_FLAG_B, b->datapins & 1);
+			hd44780_set_flag(b, HD44780_FLAG_DIRTY, 1);
+			break;
+		// Entry mode set
+		case 2:		// 0 0 0 0 0 1 I/D S
+			hd44780_set_flag(b, HD44780_FLAG_I_D, b->datapins & 2);
+			hd44780_set_flag(b, HD44780_FLAG_S, b->datapins & 1);
+			break;
+		// Return home
+		case 1:		// 0 0 0 0 0 0 1 x
+			_hd44780_reset_cursor(b);
+			delay = 1520;
+			break;
+		// Clear display
+		case 0:		// 0 0 0 0 0 0 0 1
+			_hd44780_clear_screen(b);
+			break;
+	}
+	return delay;
+}
+
+/*
+ * the E pin went low, and it's a write
+ */
+static uint32_t
+hd44780_process_write(
+		hd44780_t *b )
+{
+	uint32_t delay = 0; // uS
+	int four = !hd44780_get_flag(b, HD44780_FLAG_D_L);
+	int comp = four && hd44780_get_flag(b, HD44780_FLAG_LOWNIBBLE);
+	int write = 0;
+
+	if (four) { // 4 bits !
+		if (comp)
+			b->datapins = (b->datapins & 0xf0) | ((b->pinstate >>  IRQ_HD44780_D4) & 0xf);
+		else
+			b->datapins = (b->datapins & 0xf) | ((b->pinstate >>  IRQ_HD44780_D4-4) & 0xf0);
+		write = comp;
+		b->flags ^= (1 << HD44780_FLAG_LOWNIBBLE);
+	} else {	// 8 bits
+		b->datapins = (b->pinstate >>  IRQ_HD44780_D0) & 0xff;
+		write++;
+	}
+	avr_raise_irq(b->irq + IRQ_HD44780_DATA_IN, b->datapins);
+
+	// write has 8 bits to process
+	if (write) {
+		if (hd44780_get_flag(b, HD44780_FLAG_BUSY)) {
+			printf("%s command %02x write when still BUSY\n", __FUNCTION__, b->datapins);
+		}
+		if (b->pinstate & (1 << IRQ_HD44780_RS))	// write data
+			delay = hd44780_write_data(b);
+		else										// write command
+			delay = hd44780_write_command(b);
+	}
+	return delay;
+}
+
+static uint32_t
+hd44780_process_read(
+		hd44780_t *b )
+{
+	uint32_t delay = 0; // uS
+	int four = !hd44780_get_flag(b, HD44780_FLAG_D_L);
+	int comp = four && hd44780_get_flag(b, HD44780_FLAG_LOWNIBBLE);
+	int done = 0;	// has something on the datapin we want
+
+	if (comp) {
+		// ready the 4 final bits on the 'actual' lcd pins
+		b->readpins <<= 4;
+		done++;
+		b->flags ^= (1 << HD44780_FLAG_LOWNIBBLE);
+	}
+
+	if (!done) { // new read
+
+		if (b->pinstate & (1 << IRQ_HD44780_RS)) {	// read data
+			delay = 37;
+			b->readpins = b->vram[b->cursor];
+			hd44780_kick_cursor(b);
+		} else {	// read 'command' ie status register
+			delay = 0;	// no raising busy when reading busy !
+
+			// low bits are the current cursor
+			b->readpins = b->cursor < 80 ? b->cursor : b->cursor-64;
+			int busy = hd44780_get_flag(b, HD44780_FLAG_BUSY);
+			b->readpins |= busy ? 0x80 : 0;
+
+		//	if (busy) printf("Good boy, guy's reading status byte\n");
+			// now that we're read the busy flag, clear it and clear
+			// the timer too
+			hd44780_set_flag(b, HD44780_FLAG_BUSY, 0);
+			avr_raise_irq(b->irq + IRQ_HD44780_BUSY, 0);
+			avr_cycle_timer_cancel(b->avr, _hd44780_busy_timer, b);
+		}
+		avr_raise_irq(b->irq + IRQ_HD44780_DATA_OUT, b->readpins);
+
+		done++;
+		if (four)
+			b->flags |= (1 << HD44780_FLAG_LOWNIBBLE); // for next read
+	}
+
+	// now send the prepared output pins to send as IRQs
+	if (done) {
+		avr_raise_irq(b->irq + IRQ_HD44780_ALL, b->readpins >> 4);
+		for (int i = four ? 4 : 0; i < 8; i++)
+			avr_raise_irq(b->irq + IRQ_HD44780_D0 + i, (b->readpins >> i) & 1);
+	}
+	return delay;
+}
+
+static avr_cycle_count_t
+_hd44780_process_e_pinchange(
+		struct avr_t * avr,
+        avr_cycle_count_t when, void * param)
+{
+	hd44780_t *b = (hd44780_t *) param;
+
+	hd44780_set_flag(b, HD44780_FLAG_REENTRANT, 1);
+
+#if 0
+	uint16_t touch = b->oldstate ^ b->pinstate;
+	printf("LCD: %04x %04x %c %c %c %c\n", b->pinstate, touch,
+			b->pinstate & (1 << IRQ_HD44780_RW) ? 'R' : 'W',
+			b->pinstate & (1 << IRQ_HD44780_RS) ? 'D' : 'C',
+			hd44780_get_flag(b, HD44780_FLAG_LOWNIBBLE) ? 'L' : 'H',
+			hd44780_get_flag(b, HD44780_FLAG_BUSY) ? 'B' : ' ');
+#endif
+	int delay = 0; // in uS
+
+	if (b->pinstate & (1 << IRQ_HD44780_RW))	// read !?!
+		delay = hd44780_process_read(b);
+	else										// write
+		delay = hd44780_process_write(b);
+
+	if (delay) {
+		hd44780_set_flag(b, HD44780_FLAG_BUSY, 1);
+		avr_raise_irq(b->irq + IRQ_HD44780_BUSY, 1);
+		avr_cycle_timer_register_usec(b->avr, delay,
+			_hd44780_busy_timer, b);
+	}
+//	b->oldstate = b->pinstate;
+	hd44780_set_flag(b, HD44780_FLAG_REENTRANT, 0);
+	return 0;
+}
+
+static void
+hd44780_pin_changed_hook(
+		struct avr_irq_t * irq,
+		uint32_t value,
+        void *param)
+{
+	hd44780_t *b = (hd44780_t *) param;
+
+	uint16_t old = b->pinstate;
+
+	switch (irq->irq) {
+		/*
+		 * Update all the pins in one go by calling ourselves
+		 * This is a shortcut for firmware that respects the conventions
+		 */
+		case IRQ_HD44780_ALL:
+			for (int i = 0; i < 4; i++)
+				hd44780_pin_changed_hook(b->irq + IRQ_HD44780_D4 + i,
+						((value >> i) & 1), param);
+			hd44780_pin_changed_hook(b->irq + IRQ_HD44780_RS, (value >> 4), param);
+			hd44780_pin_changed_hook(b->irq + IRQ_HD44780_E, (value >> 5), param);
+			hd44780_pin_changed_hook(b->irq + IRQ_HD44780_RW, (value >> 6), param);
+			return; // job already done!
+		case IRQ_HD44780_D0 ... IRQ_HD44780_D7:
+			// don't update these pins in read mode
+			if (hd44780_get_flag(b, HD44780_FLAG_REENTRANT))
+				return;
+			break;
+	}
+	b->pinstate = (b->pinstate & ~(1 << irq->irq)) | (value << irq->irq);
+	int eo = old & (1 << IRQ_HD44780_E);
+	int e = b->pinstate & (1 << IRQ_HD44780_E);
+	// on the E pin rising edge, do stuff otherwise just exit
+	if (!eo && e)
+		avr_cycle_timer_register(b->avr, 1, _hd44780_process_e_pinchange, b);
+}
+
+void
+hd44780_init(
+		struct avr_t *avr,
+		struct hd44780_t * b,
+		int width,
+		int height )
+{
+	memset(b, 0, sizeof(*b));
+	b->avr = avr;
+	b->w = width;
+	b->h = height;
+	/*
+	 * Register callbacks on all our IRQs
+	 */
+	b->irq = avr_alloc_irq(0, IRQ_HD44780_COUNT);
+	for (int i = 0; i < IRQ_HD44780_INPUT_COUNT; i++)
+		avr_irq_register_notify(b->irq + i, hd44780_pin_changed_hook, b);
+
+	_hd44780_reset_cursor(b);
+	_hd44780_clear_screen(b);
+
+	printf("LCD: %duS is %d cycles for your AVR\n",
+			37, (int)avr_usec_to_cycles(avr, 37));
+	printf("LCD: %duS is %d cycles for your AVR\n",
+			1, (int)avr_usec_to_cycles(avr, 1));
+}
+
diff --git a/examples/parts/hd44780.h b/examples/parts/hd44780.h
new file mode 100644
index 0000000..e3f1dd0
--- /dev/null
+++ b/examples/parts/hd44780.h
@@ -0,0 +1,137 @@
+/*
+	hd44780.h
+
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This "Part" simulates the business end of a HD44780 LCD display
+ * It supports from 8x1 to 20x4 or even 40x4 (not sure that exists)
+ *
+ * It works both in 4 bits and 8 bits mode and supports a "quicky" method
+ * of driving that is commonly used on AVR, namely
+ * (msb) RW:E:RS:D7:D6:D5:D4 (lsb)
+ *
+ * + As usual, the "RW" pin is optional if you are willing to wait for the
+ *   specific number of cycles as per the datasheet (37uS between operations)
+ * + If you decide to use the RW pin, the "busy" flag is supported and will
+ *   be automaticly cleared on the second read, to exercisee the code a bit.
+ * + Cursor is supported, but now "display shift"
+ * + The Character RAM is supported, but is not currently drawn.
+ *
+ * To interface this part, you can use the "INPUT" IRQs and hook them to the
+ * simavr instance, if you use the RW pins or read back frim the display, you
+ * can hook the data pins /back/ to the AVR too.
+ *
+ * The "part" also provides various IRQs that are there to be placed in a VCD file
+ * to show what is sent, and some of the internal status.
+ *
+ * This part has been tested with two different implementation of an AVR driver
+ * for the hd44780. The one shipped in this directory is straight out of the
+ * avr-libc example code.
+ */
+#ifndef __HD44780_H__
+#define __HD44780_H__
+
+#include "sim_irq.h"
+
+enum {
+    IRQ_HD44780_ALL = 0,	// Only if (msb) RW:E:RS:D7:D6:D5:D4 (lsb)  configured
+    IRQ_HD44780_RS,
+    IRQ_HD44780_RW,
+    IRQ_HD44780_E,
+    // bidirectional
+    IRQ_HD44780_D0,IRQ_HD44780_D1,IRQ_HD44780_D2,IRQ_HD44780_D3,
+    IRQ_HD44780_D4,IRQ_HD44780_D5,IRQ_HD44780_D6,IRQ_HD44780_D7,
+    IRQ_HD44780_INPUT_COUNT,
+
+    IRQ_HD44780_BUSY,	// for VCD traces sake...
+    IRQ_HD44780_ADDR,
+    IRQ_HD44780_DATA_IN,
+    IRQ_HD44780_DATA_OUT,
+    IRQ_HD44780_COUNT
+};
+
+enum {
+    HD44780_FLAG_F = 0,         // 1: 5x10 Font, 0: 5x7 Font
+    HD44780_FLAG_N,             // 1: 2/4-lines Display, 0: 1-line Display,
+    HD44780_FLAG_D_L,           // 1: 4-Bit Interface, 0: 8-Bit Interface
+    HD44780_FLAG_R_L,           // 1: Shift right, 0: shift left
+    HD44780_FLAG_S_C,           // 1: Display shift, 0: Cursor move
+    HD44780_FLAG_B,             // 1: Cursor Blink
+    HD44780_FLAG_C,             // 1: Cursor on
+    HD44780_FLAG_D,             // 1: Set Entire Display memory (for clear)
+    HD44780_FLAG_S,             // 1: Follow display shift
+    HD44780_FLAG_I_D,			// 1: Increment, 0: Decrement
+
+    /*
+     * Internal flags, not HD44780
+     */
+    HD44780_FLAG_LOWNIBBLE,		// 1: 4 bits mode, write/read low nibble
+    HD44780_FLAG_BUSY,			// 1: Busy between instruction, 0: ready
+    HD44780_FLAG_REENTRANT,		// 1: Do not update pins
+
+    HD44780_FLAG_DIRTY,			// 1: needs redisplay...
+    HD44780_FLAG_CRAM_DIRTY,	// 1: Character memory has changed
+};
+
+
+typedef struct hd44780_t
+{
+	avr_irq_t * irq;
+	struct avr_t * avr;
+	int		w, h;				// width and height of the LCD
+
+	uint16_t cursor;			// offset in vram
+	uint8_t  vram[80 + 64];
+
+	uint16_t pinstate;			// 'actual' LCd data pins (IRQ bit field)
+	// uint16_t oldstate;			/// previous pins
+	uint8_t	 datapins;			// composite of 4 high bits, or 8 bits
+	uint8_t  readpins;
+
+	uint16_t flags;				// LCD flags ( HD44780_FLAG_*)
+} hd44780_t;
+
+void
+hd44780_init(
+		struct avr_t *avr,
+		struct hd44780_t * b,
+		int width,
+		int height );
+void
+hd44780_print(
+		struct hd44780_t *b);
+
+static inline int
+hd44780_set_flag(
+		hd44780_t *b, uint16_t bit, int val)
+{
+	int old = b->flags &  (1 << bit);
+	b->flags = (b->flags & ~(1 << bit)) | (val ? (1 << bit) : 0);
+	return old != 0;
+}
+
+static inline int
+hd44780_get_flag(
+		hd44780_t *b, uint16_t bit)
+{
+	return (b->flags &  (1 << bit)) != 0;
+}
+
+#endif 
diff --git a/examples/parts/hd44780_glut.c b/examples/parts/hd44780_glut.c
new file mode 100644
index 0000000..56940f5
--- /dev/null
+++ b/examples/parts/hd44780_glut.c
@@ -0,0 +1,151 @@
+/*
+	hd44780_glut.c
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hd44780_glut.h"
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#include "font.h"	// generated with gimp
+
+static GLuint font_texture;
+static int charwidth = 5;
+static int charheight = 7;
+
+void
+hd44780_gl_init()
+{
+	glGenTextures(1, &font_texture);
+	glBindTexture(GL_TEXTURE_2D, font_texture);
+	glTexImage2D(GL_TEXTURE_2D, 0, 4,
+			lcd_font.width,
+			lcd_font.height, 0, GL_RGBA,
+	        GL_UNSIGNED_BYTE,
+	        lcd_font.pixel_data);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	glMatrixMode(GL_TEXTURE);
+	glLoadIdentity();
+	glScalef(1.0f / (GLfloat) lcd_font.width, 1.0f / (GLfloat) lcd_font.height, 1.0f);
+
+	glMatrixMode(GL_MODELVIEW);
+}
+
+static inline void
+glColor32U(uint32_t color)
+{
+	glColor4f(
+			(float)((color >> 24) & 0xff) / 255.0f,
+			(float)((color >> 16) & 0xff) / 255.0f,
+			(float)((color >> 8) & 0xff) / 255.0f,
+			(float)((color) & 0xff) / 255.0f );
+}
+
+void
+glputchar(char c,
+		uint32_t character,
+		uint32_t text,
+		uint32_t shadow)
+{
+	int index = c;
+	int left = index * charwidth;
+	int right = index * charwidth + charwidth;
+	int top = 0;
+	int bottom = 7;
+
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glDisable(GL_TEXTURE_2D);
+	glColor32U(character);
+	glBegin(GL_QUADS);
+	glVertex3i(5, 7, 0);
+	glVertex3i(0, 7, 0);
+	glVertex3i(0, 0, 0);
+	glVertex3i(5, 0, 0);
+	glEnd();
+
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glEnable(GL_TEXTURE_2D);
+	glBindTexture(GL_TEXTURE_2D, font_texture);
+	if (shadow) {
+		glColor32U(shadow);
+		glPushMatrix();
+		glTranslatef(.2f, .2f, 0);
+		glBegin(GL_QUADS);
+		glTexCoord2i(right, top);		glVertex3i(5, 0, 0);
+		glTexCoord2i(left, top);		glVertex3i(0, 0, 0);
+		glTexCoord2i(left, bottom);		glVertex3i(0, 7, 0);
+		glTexCoord2i(right, bottom);	glVertex3i(5, 7, 0);
+		glEnd();
+		glPopMatrix();
+	}
+	glColor32U(text);
+	glBegin(GL_QUADS);
+	glTexCoord2i(right, top);		glVertex3i(5, 0, 0);
+	glTexCoord2i(left, top);		glVertex3i(0, 0, 0);
+	glTexCoord2i(left, bottom);		glVertex3i(0, 7, 0);
+	glTexCoord2i(right, bottom);	glVertex3i(5, 7, 0);
+	glEnd();
+
+}
+
+void
+hd44780_gl_draw(
+		hd44780_t *b,
+		uint32_t background,
+		uint32_t character,
+		uint32_t text,
+		uint32_t shadow)
+{
+	int rows = b->w;
+	int lines = b->h;
+	int border = 3;
+
+	glDisable(GL_TEXTURE_2D);
+	glDisable(GL_BLEND);
+	glColor32U(background);
+	glTranslatef(border, border, 0);
+	glBegin(GL_QUADS);
+	glVertex3f(rows * charwidth + (rows - 1) + border, -border, 0);
+	glVertex3f(-border, -border, 0);
+	glVertex3f(-border, lines * charheight + (lines - 1) + border, 0);
+	glVertex3f(rows * charwidth + (rows - 1) + border, lines * charheight
+	        + (lines - 1) + border, 0);
+	glEnd();
+
+	glColor3f(1.0f, 1.0f, 1.0f);
+	const uint8_t offset[] = { 0, 0x40, 0x20, 0x60 };
+	for (int v = 0 ; v < b->h; v++) {
+		glPushMatrix();
+		for (int i = 0; i < b->w; i++) {
+			glputchar(b->vram[offset[v] + i], character, text, shadow);
+			glTranslatef(6, 0, 0);
+		}
+		glPopMatrix();
+		glTranslatef(0, 8, 0);
+	}
+	hd44780_set_flag(b, HD44780_FLAG_DIRTY, 0);
+}
diff --git a/examples/parts/hd44780_glut.h b/examples/parts/hd44780_glut.h
new file mode 100644
index 0000000..15b8717
--- /dev/null
+++ b/examples/parts/hd44780_glut.h
@@ -0,0 +1,38 @@
+/*
+	hd44780_glut.h
+
+	Copyright Luki <humbell@ethz.ch>
+	Copyright 2011 Michel Pollet <buserror@gmail.com>
+
+ 	This file is part of simavr.
+
+	simavr is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	simavr is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __HD44780_GLUT_H__
+#define __HD44780_GLUT_H__
+
+#include "hd44780.h"
+
+void
+hd44780_gl_draw(
+		hd44780_t *b,
+		uint32_t background,
+		uint32_t character,
+		uint32_t text,
+		uint32_t shadow);
+
+void
+hd44780_gl_init();
+
+#endif
-- 
2.39.5