diff --git a/Makefile b/Makefile
index 7d5678e..b5b61fd 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ CC = avr-gcc
 OBJCOPY = avr-objcopy
 AVRDUDE = avrdude
 CFLAGS = -Os -DF_CPU=16000000UL -mmcu=atmega328p 
-SERIAL = /dev/cu.usbmodem143401
+SERIAL = /dev/cu.usbmodem141401
 ADDR = $(shell heptc -where)/c
 TARGET = prog
 LIB = arduinolib
diff --git a/arduinolib.c b/arduinolib.c
index 1b2e743..586433e 100644
--- a/arduinolib.c
+++ b/arduinolib.c
@@ -2,60 +2,152 @@
 #include <avr/io.h>
 #include <util/delay.h>
 #include "arduinolib.h"
-//#include "HardwareSerial.h"
-
-void Arduinolib__dwrite_step(int p, int v, Arduinolib__dwrite_out *out){
-    /* set pin 5 of PORTB for output. i.e port 13 */
-    if (p == 13){
-        DDRB |= _BV(DDB5);
-        if (v == 0)
-        {
-            PORTB &= ~(1<<PORTB5);
-            //PORTB &= ~_BV(PORTB5); //put it to low
-            return;
-        }
-        PORTB |= (1<<PORTB5);
-        //PORTB |= _BV(PORTB5);
-        return;
-    }
-    DDRB |= _BV(DDB4);
-    if (v == 0)
-    {
-        PORTB &= ~(1<<PORTB4);
-        //PORTB &= ~_BV(PORTB4); //put it to low
-        return;
-    }
-    PORTB |= (1<<PORTB4);
-    //PORTB |= _BV(PORTB4);
-    return;
-    
+
+/* Configure the pins of arduino */
+void Arduinolib__dinit_step(Arduinolib__dinit_out *out){
+    //control
+    LCD_E_DDR |= (1 << LCD_E_PIN);
+    LCD_RS_DDR |= (1 << LCD_RS_PIN);
+    //data 
+    LCD_D4_DDR |= (1 << LCD_D4_PIN);
+    LCD_D5_DDR |= (1 << LCD_D5_PIN);
+    LCD_D6_DDR |= (1 << LCD_D6_PIN);
+    LCD_D7_DDR |= (1 << LCD_D7_PIN);
+}
+
+/* Initialize the LCD as described in the datasheet */
+void Arduinolib__lcd_init_step(Arduinolib__lcd_init_out *out){
+
+    _delay_ms(50); //power delay more than 15ms
+
+    LCD_RS_PORT &= ~(1 << LCD_RS_PIN); //RS to low
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //E to low
+
+
+    // "reboot process"
+    Arduinolib__lcd_write_out *o1;
+    Arduinolib__lcd_write_step(LCD_FUNCTION_SET_8bit, o1);
+    _delay_ms(10); //more than 4.1ms
+    Arduinolib__lcd_write_out *o2;
+    Arduinolib__lcd_write_step(LCD_FUNCTION_SET_8bit,o2);
+    _delay_us(200); //more than 100us
+    Arduinolib__lcd_write_out *o3;
+    Arduinolib__lcd_write_step(LCD_FUNCTION_SET_8bit, o3);
+    _delay_us(200); //more than 100us
+
+    //set to 4bit
+    Arduinolib__lcd_write_out *o4;
+    Arduinolib__lcd_write_step(LCD_FUNCTION_SET_4bit, o4);
+    _delay_us(80); //more than 39us
+    Arduinolib__lcd_cmd_out *o5;
+    Arduinolib__lcd_cmd_step(LCD_FUNCTION_SET_4bit, o5); 
+    _delay_us(80); //more than 39us
+
+    //send instructions
+    Arduinolib__lcd_cmd_out *o6;
+    Arduinolib__lcd_cmd_step(LCD_DISPLAY_OFF, o6);
+    _delay_us(80); //more than 39us
+    Arduinolib__lcd_cmd_out *o7;
+    Arduinolib__lcd_cmd_step(LCD_CLEAR, o7);
+    _delay_ms(3); //more than 1.53 ms
+    Arduinolib__lcd_cmd_out *o8;
+    Arduinolib__lcd_cmd_step(LCD_ENTRY_MODE, o8);
+    _delay_us(80); //more than 39us
+    Arduinolib__lcd_cmd_out *o9;
+    Arduinolib__lcd_cmd_step(LCD_DISPLAY_ON, o9);
+    _delay_us(80); //more than 39us
+
+
+    // if we use this code the msg is printed ///
+    /*uint8_t msg[] = "Arduino";
+    Arduinolib__lcd_string_out *o;
+    Arduinolib__lcd_string_step(msg, o);*/
+
+}
+
+/* send an 8bit information to the LCD register in order to be written */
+void Arduinolib__lcd_write_step(uint8_t info, Arduinolib__lcd_write_out *out){
+    //(info & 1 << 4) ? LCD_D4_PORT |= (1 << LCD_D4_PIN) :  LCD_D4_PORT &= ~(1 << LCD_D4_PIN)
+    if (info & 1<<4){
+        LCD_D4_PORT |= (1 << LCD_D4_PIN);
+    }
+    else {
+        LCD_D4_PORT &= ~(1 << LCD_D4_PIN);
+    }
+
+    if (info & 1<<5){
+        LCD_D5_PORT |= (1 << LCD_D5_PIN);
+    }
+    else {
+        LCD_D5_PORT &= ~(1 << LCD_D5_PIN);
+    }
+
+    if (info & 1<<6){
+        LCD_D6_PORT |= (1 << LCD_D6_PIN);
+    }
+    else {
+        LCD_D6_PORT &= ~(1 << LCD_D6_PIN);
+    }
+    if (info & 1<<7){
+        LCD_D7_PORT |= (1 << LCD_D7_PIN);
+    }
+    else {
+        LCD_D7_PORT &= ~(1 << LCD_D7_PIN);
+    }
+
+    //pulse the Enable pin to indicate we have written the data
+    LCD_E_PORT |= (1 << LCD_E_PIN); //high
+    _delay_us(1);
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //low
+    _delay_us(1);
 }
 
+/* send an 8bit instruction to the LCD instruction register */
+void Arduinolib__lcd_cmd_step(uint8_t cmd, Arduinolib__lcd_cmd_out *out){
 
-/*void Arduinolib__dwrite_step(int p, int v, Arduinolib__dwrite_out *out)
-{
- pinMode(p,OUTPUT);
-  if(v==0)
-	{
-	digitalWrite(p,LOW);
-	//Serial.write("low");
-	return;
-	}
-	digitalWrite(p,HIGH);
-	//Serial.write("high");
+    LCD_RS_PORT &= ~(1 << LCD_RS_PIN); //low
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //low
+    Arduinolib__lcd_write_out *o1;
+    Arduinolib__lcd_write_step(cmd, o1); // upper 4 bits
+    Arduinolib__lcd_write_out *o2;
+    Arduinolib__lcd_write_step(cmd << 4, o2); // lower 4 bits
 }
-*/
-/*void Mathext__st_cos_reset(Mathext__st_cos_mem *self)
-{
-  int j;
-  self->i = 0;
-  for(j = 0; j < 100; ++j)
-    self->mem[j] = 0.0;
+
+/* send an 8bit data character to the LCD register */
+void Arduinolib__lcd_char_step(uint8_t char_data, Arduinolib__lcd_char_out *out){
+
+    LCD_RS_PORT |= (1 << LCD_RS_PIN); //high
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //low
+    Arduinolib__lcd_write_out *o1;
+    Arduinolib__lcd_write_step(char_data, o1); // upper 4 bits
+    Arduinolib__lcd_write_out *o2;
+    Arduinolib__lcd_write_step(char_data << 4, o2); // lower 4 bits
+}
+
+/* give a string to display to the LCD */
+void Arduinolib__lcd_string_step(uint8_t lstring[], Arduinolib__lcd_string_out *out){
+
+    //uint8_t lstring = atoi(message);
+    volatile int i = 0;
+    for (i = 0; lstring[i] != 0 ; i++) {
+        Arduinolib__lcd_char_out *o1;
+        Arduinolib__lcd_char_step(lstring[i], o1);
+        _delay_us(80); //more than 39us
+    }
 }
 
-void Mathext__st_cos_step(float a, Mathext__st_cos_out *out, Mathext__st_cos_mem *self)
-{
-  out->o = self->mem[self->i];
-  self->i = (self->i+1) % 100;
-  self->mem[self->i] = cosf(a);
+/*uint8_t msg[] = "Arduino";
+uint8_t msg2[] = "Hello world";
+
+int main(void) {
+    Arduinolib__dinit_step();
+    Arduinolib__lcd_init_step();
+    Arduinolib__lcd_string_step(msg);
+    Arduinolib__lcd_cmd_step(LCD_CURSOR_SET | LCD_START_LINE2);
+    _delay_us(80); // more than 39us
+    Arduinolib__lcd_string_step(msg2);
+
+    while(1);
+    return 0;
 }*/
+
diff --git a/arduinolib.epi b/arduinolib.epi
index fc4a16f..0c0a718 100644
--- a/arduinolib.epi
+++ b/arduinolib.epi
@@ -1,2 +1,8 @@
-fun dwrite(p:int; v:bool) returns ()
+type uint8_t = int
 
+fun dinit() returns ()
+fun lcd_init() returns ()
+fun lcd_write(info:uint8_t) returns ()
+fun lcd_cmd(cmd:uint8_t) returns ()
+fun lcd_char(char_data:uint8_t) returns ()
+fun lcd_string (lstring:uint8_t) returns ()
diff --git a/arduinolib.h b/arduinolib.h
index 74ec448..0674500 100644
--- a/arduinolib.h
+++ b/arduinolib.h
@@ -1 +1,67 @@
 #include "arduinolib_types.h"
+
+/* LCD with 4 bit mode for an ATMEGA32P processor
+
+  _ LCD _       _ ATMEGA32P (arduino)_
+  1   VSS   ->          GND
+  2   VDD   ->          +5V
+  3   V0    ->      Potentiometer
+  4   RS    ->  PortB4 (Pin 12 arduino)
+  5   RW    ->          GND
+  6   E     ->  PortB3 (Pin 11 arduino)
+  (7 - 10)  ->          ...
+  11  D4    ->  PortD5 (Pin 5 arduino)
+  12  D5    ->  PortD4 (Pin 4 arduino)
+  13  D6    ->  PortD3 (Pin 3 arduino)
+  14  D7    ->  PortD2 (Pin 2 arduino)
+  15  A     ->    +5v with resistor
+  16  K     ->          GND
+
+*/
+
+// LCD display size
+#define LCD_START_LINE1   0x00
+#define LCD_START_LINE2   0x40
+
+// LCD ports/pins/ddr
+#define LCD_RS_PORT PORTB
+#define LCD_RS_PIN  4
+#define LCD_RS_DDR  DDRB
+
+#define LCD_E_PORT  PORTB
+#define LCD_E_PIN   3
+#define LCD_E_DDR   DDRB
+
+#define LCD_D4_PORT PORTD
+#define LCD_D4_PIN  5
+#define LCD_D4_DDR  DDRD
+
+#define LCD_D5_PORT PORTD
+#define LCD_D5_PIN  4
+#define LCD_D5_DDR  DDRD
+
+#define LCD_D6_PORT PORTD
+#define LCD_D6_PIN  3
+#define LCD_D6_DDR  DDRD
+
+#define LCD_D7_PORT PORTD
+#define LCD_D7_PIN  2
+#define LCD_D7_DDR  DDRD
+
+//LCD instructions (see LCD-1602A datasheet)
+#define LCD_CLEAR       0b00000001
+#define LCD_HOME        0b00000010
+#define LCD_ENTRY_MODE  0b00000110
+#define LCD_DISPLAY_ON  0b00001100
+#define LCD_DISPLAY_OFF 0b00001000
+#define LCD_CURSOR_SET  0b10000000
+#define LCD_FUNCTION_SET_8bit   0b00110000
+#define LCD_FUNCTION_SET_4bit   0b00101000
+
+// Functions
+/*void dinit(void);
+void lcd_init(void);
+void lcd_write(uint8_t);
+void lcd_cmd(uint8_t);
+void lcd_char(uint8_t);
+void lcd_string(uint8_t *);*/
\ No newline at end of file
diff --git a/arduinolib_types.h b/arduinolib_types.h
index 0570697..ff409a4 100644
--- a/arduinolib_types.h
+++ b/arduinolib_types.h
@@ -1,11 +1,44 @@
 #ifndef ARDUINOLIB_H
 #define ARDUINOLIB_H
-//#include "Arduino.h"
-//#include "WConstants.h"
-/* Example of a combinatorial function */
-typedef struct Arduinolib__dwrite {
-} Arduinolib__dwrite_out;
 
-void Arduinolib__dwrite_step(int p, int v,Arduinolib__dwrite_out *o);
+//typedef struct string {
+//    const char *msg
+//} Arduinolib__string_out;
 
-#endif
+typedef struct byte_out {
+  uint8_t value ;
+} byte_out ;
+
+typedef byte_out Arduinolib__bitOr_out ;
+
+typedef struct Arduinolib__dinit {
+} Arduinolib__dinit_out;
+
+typedef struct Arduinolib__lcd_init {
+} Arduinolib__lcd_init_out;
+
+typedef struct Arduinolib__lcd_write {
+} Arduinolib__lcd_write_out;
+
+typedef struct Arduinolib__lcd_cmd {
+} Arduinolib__lcd_cmd_out;
+
+typedef struct Arduinolib__lcd_char {
+} Arduinolib__lcd_char_out;
+
+typedef struct Arduinolib__lcd_string {
+} Arduinolib__lcd_string_out;
+
+void Arduinolib__dinit_step(Arduinolib__dinit_out *o);
+
+void Arduinolib__lcd_init_step(Arduinolib__lcd_init_out *o);
+
+void Arduinolib__lcd_write_step(uint8_t info, Arduinolib__lcd_write_out *o);
+
+void Arduinolib__lcd_cmd_step(uint8_t cmd, Arduinolib__lcd_cmd_out *o);
+
+void Arduinolib__lcd_char_step(uint8_t char_data, Arduinolib__lcd_char_out *o);
+
+void Arduinolib__lcd_string_step(uint8_t lstring[], Arduinolib__lcd_string_out *o);
+
+#endif
\ No newline at end of file
diff --git a/lcd_c/.DS_Store b/lcd_c/.DS_Store
new file mode 100644
index 0000000..5008ddf
Binary files /dev/null and b/lcd_c/.DS_Store differ
diff --git a/lcd_c/Makefile b/lcd_c/Makefile
new file mode 100644
index 0000000..f20a956
--- /dev/null
+++ b/lcd_c/Makefile
@@ -0,0 +1,37 @@
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+AVRDUDE = avrdude
+CFLAGS = -Os -DF_CPU=16000000UL -mmcu=atmega328p 
+SERIAL = /dev/cu.usbmodem141401
+ADDR = $(shell heptc -where)/c
+TARGET = lcd
+
+
+.PHONY: all clean flash
+
+all: $(TARGET).hex
+
+flash: $(TARGET).hex
+	$(AVRDUDE) -F -V -c arduino -p ATMEGA328P -P $(SERIAL) -b 115200 \
+	    -U flash:w:$<
+
+
+$(TARGET).hex: $(TARGET)
+	$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+
+$(TARGET): $(TARGET).o
+	$(CC) $(CFLAGS) -o $@ *.o
+
+$(TARGET).o : $(TARGET).c
+	$(CC) -g $(CFLAGS) -c -I $(ADDR) -I . $(TARGET).c
+
+
+
+
+clean:
+	rm -f $(TARGET) $(TARGET).hex $(TARGET).o $(TARGET).log $(TARGET).mls
+	rm -f *.o *.epci *.hex
+	rm -r $(TARGET)_c
+
+
diff --git a/lcd_c/lcd.c b/lcd_c/lcd.c
new file mode 100644
index 0000000..6cf120b
--- /dev/null
+++ b/lcd_c/lcd.c
@@ -0,0 +1,130 @@
+#include "lcd_definitions.h"
+
+/* Configure the pins of arduino */
+void dinit(void){
+    //control
+    LCD_E_DDR |= (1 << LCD_E_PIN);
+    LCD_RS_DDR |= (1 << LCD_RS_PIN);
+    //data 
+    LCD_D4_DDR |= (1 << LCD_D4_PIN);
+    LCD_D5_DDR |= (1 << LCD_D5_PIN);
+    LCD_D6_DDR |= (1 << LCD_D6_PIN);
+    LCD_D7_DDR |= (1 << LCD_D7_PIN);
+}
+
+/* Initialize the LCD as described in the datasheet */
+void lcd_init(void){
+
+    _delay_ms(50); //power delay more than 15ms
+
+    LCD_RS_PORT &= ~(1 << LCD_RS_PIN); //RS to low
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //E to low
+
+
+    // "reboot process"
+    lcd_write(LCD_FUNCTION_SET_8bit);
+    _delay_ms(10); //more than 4.1ms
+    lcd_write(LCD_FUNCTION_SET_8bit);
+    _delay_us(200); //more than 100us
+    lcd_write(LCD_FUNCTION_SET_8bit);
+    _delay_us(200); //more than 100us
+
+    //set to 4bit
+    lcd_write(LCD_FUNCTION_SET_4bit);
+    _delay_us(80); //more than 39us
+    lcd_cmd(LCD_FUNCTION_SET_4bit); 
+    _delay_us(80); //more than 39us
+
+    //send instructions
+    lcd_cmd(LCD_DISPLAY_OFF);
+    _delay_us(80); //more than 39us
+    lcd_cmd(LCD_CLEAR);
+    _delay_ms(3); //more than 1.53 ms
+    lcd_cmd(LCD_ENTRY_MODE);
+    _delay_us(80); //more than 39us
+    lcd_cmd(LCD_DISPLAY_ON);
+    _delay_us(80); //more than 39us
+
+}
+
+/* send an 8bit information to the LCD register in order to be written */
+void lcd_write(uint8_t info){
+    //(info & 1 << 4) ? LCD_D4_PORT |= (1 << LCD_D4_PIN) :  LCD_D4_PORT &= ~(1 << LCD_D4_PIN)
+    if (info & 1<<4){
+        LCD_D4_PORT |= (1 << LCD_D4_PIN);
+    }
+    else {
+        LCD_D4_PORT &= ~(1 << LCD_D4_PIN);
+    }
+
+    if (info & 1<<5){
+        LCD_D5_PORT |= (1 << LCD_D5_PIN);
+    }
+    else {
+        LCD_D5_PORT &= ~(1 << LCD_D5_PIN);
+    }
+
+    if (info & 1<<6){
+        LCD_D6_PORT |= (1 << LCD_D6_PIN);
+    }
+    else {
+        LCD_D6_PORT &= ~(1 << LCD_D6_PIN);
+    }
+    if (info & 1<<7){
+        LCD_D7_PORT |= (1 << LCD_D7_PIN);
+    }
+    else {
+        LCD_D7_PORT &= ~(1 << LCD_D7_PIN);
+    }
+
+    //pulse the Enable pin to indicate we have written the data
+    LCD_E_PORT |= (1 << LCD_E_PIN); //high
+    _delay_us(1);
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //low
+    _delay_us(1);
+}
+
+/* send an 8bit instruction to the LCD instruction register */
+void lcd_cmd(uint8_t cmd){
+
+    LCD_RS_PORT &= ~(1 << LCD_RS_PIN); //low
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //low
+    lcd_write(cmd); // upper 4 bits
+    lcd_write(cmd << 4); // lower 4 bits
+}
+
+/* send an 8bit data character to the LCD register */
+void lcd_char(uint8_t char_data){
+
+    LCD_RS_PORT |= (1 << LCD_RS_PIN); //high
+    LCD_E_PORT &= ~(1 << LCD_E_PIN); //low
+    lcd_write(char_data); // upper 4 bits
+    lcd_write(char_data << 4); // lower 4 bits
+}
+
+/* give a string to display to the LCD */
+void lcd_string(uint8_t lstring[]){
+
+    //uint8_t lstring = atoi(message);
+    volatile int i = 0;
+    for (i = 0; lstring[i] != 0 ; i++) {
+        lcd_char(lstring[i]);
+        _delay_us(80); //more than 39us
+    }
+}
+
+uint8_t msg[] = "Arduino";
+uint8_t msg2[] = "Hello world";
+
+int main(void) {
+    dinit();
+    lcd_init();
+    lcd_string(msg);
+    lcd_cmd(LCD_CURSOR_SET | LCD_START_LINE2);
+    _delay_us(80); // more than 39us
+    lcd_string(msg2);
+
+    while(1);
+    return 0;
+}
+
diff --git a/lcd_c/lcd_definitions.h b/lcd_c/lcd_definitions.h
new file mode 100644
index 0000000..fc3823e
--- /dev/null
+++ b/lcd_c/lcd_definitions.h
@@ -0,0 +1,68 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+/* LCD with 4 bit mode for an ATMEGA32P processor
+
+  _ LCD _       _ ATMEGA32P (arduino)_
+  1   VSS   ->          GND
+  2   VDD   ->          +5V
+  3   V0    ->      Potentiometer
+  4   RS    ->  PortB4 (Pin 12 arduino)
+  5   RW    ->          GND
+  6   E     ->  PortB3 (Pin 11 arduino)
+  (7 - 10)  ->          ...
+  11  D4    ->  PortD5 (Pin 5 arduino)
+  12  D5    ->  PortD4 (Pin 4 arduino)
+  13  D6    ->  PortD3 (Pin 3 arduino)
+  14  D7    ->  PortD2 (Pin 2 arduino)
+  15  A     ->    +5v with resistor
+  16  K     ->          GND
+
+*/
+
+// LCD display size
+#define LCD_START_LINE1   0x00
+#define LCD_START_LINE2   0x40
+
+// LCD ports/pins/ddr
+#define LCD_RS_PORT PORTB
+#define LCD_RS_PIN  4
+#define LCD_RS_DDR  DDRB
+
+#define LCD_E_PORT  PORTB
+#define LCD_E_PIN   3
+#define LCD_E_DDR   DDRB
+
+#define LCD_D4_PORT PORTD
+#define LCD_D4_PIN  5
+#define LCD_D4_DDR  DDRD
+
+#define LCD_D5_PORT PORTD
+#define LCD_D5_PIN  4
+#define LCD_D5_DDR  DDRD
+
+#define LCD_D6_PORT PORTD
+#define LCD_D6_PIN  3
+#define LCD_D6_DDR  DDRD
+
+#define LCD_D7_PORT PORTD
+#define LCD_D7_PIN  2
+#define LCD_D7_DDR  DDRD
+
+//LCD instructions (see LCD-1602A datasheet)
+#define LCD_CLEAR       0b00000001
+#define LCD_HOME        0b00000010
+#define LCD_ENTRY_MODE  0b00000110
+#define LCD_DISPLAY_ON  0b00001100
+#define LCD_DISPLAY_OFF 0b00001000
+#define LCD_CURSOR_SET  0b10000000
+#define LCD_FUNCTION_SET_8bit   0b00110000
+#define LCD_FUNCTION_SET_4bit   0b00101000
+
+// Functions
+void dinit(void);
+void lcd_init(void);
+void lcd_write(uint8_t);
+void lcd_cmd(uint8_t);
+void lcd_char(uint8_t);
+void lcd_string(uint8_t *);
diff --git a/parallel_led/.DS_Store b/parallel_led/.DS_Store
new file mode 100644
index 0000000..97842b3
Binary files /dev/null and b/parallel_led/.DS_Store differ
diff --git a/parallel_led/Makefile b/parallel_led/Makefile
new file mode 100644
index 0000000..7d5678e
--- /dev/null
+++ b/parallel_led/Makefile
@@ -0,0 +1,42 @@
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+AVRDUDE = avrdude
+CFLAGS = -Os -DF_CPU=16000000UL -mmcu=atmega328p 
+SERIAL = /dev/cu.usbmodem143401
+ADDR = $(shell heptc -where)/c
+TARGET = prog
+LIB = arduinolib
+MAIN = main
+
+
+.PHONY: all clean flash
+
+all: $(TARGET).hex
+
+flash: $(TARGET).hex
+	$(AVRDUDE) -F -V -c arduino -p ATMEGA328P -P $(SERIAL) -b 115200 \
+	    -U flash:w:$<
+
+
+$(TARGET).hex: $(TARGET)
+	$(OBJCOPY) -O ihex -R .eeprom $< $@
+
+
+$(TARGET): $(TARGET).o
+	$(CC) $(CFLAGS) -o $@ *.o
+
+$(TARGET).o : $(TARGET).c
+	$(CC) -g $(CFLAGS) -c -I $(ADDR) -I . $(LIB).c $(TARGET)_c/*.c $(MAIN).c
+
+
+$(TARGET).c:
+	heptc $(LIB).epi
+	heptc -target c $(TARGET).ept
+
+
+clean:
+	rm -f $(TARGET) $(TARGET).hex $(TARGET).o $(TARGET).log $(TARGET).mls
+	rm -f *.o *.epci
+	rm -r $(TARGET)_c
+
+
diff --git a/parallel_led/arduinolib.c b/parallel_led/arduinolib.c
new file mode 100644
index 0000000..2ab4aa3
--- /dev/null
+++ b/parallel_led/arduinolib.c
@@ -0,0 +1,32 @@
+//#include <math.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "arduinolib.h"
+//#include "HardwareSerial.h"
+
+void Arduinolib__dwrite_step(int p, int v, Arduinolib__dwrite_out *out){
+    /* set pin 5 of PORTB for output. i.e port 13 */
+    if (p == 13){
+        DDRC |= _BV(DDD7);
+        if (v == 0)
+        {
+            PORTD &= ~(1<<PORTD7);
+            //PORTB &= ~_BV(PORTB5); //put it to low
+            return;
+        }
+        PORTD |= (1<<PORTD7);
+        //PORTB |= _BV(PORTB5);
+        return;
+    }
+    DDRD |= _BV(DDD5);
+    if (v == 0)
+    {
+        PORTD &= ~(1<<PORTD5);
+        //PORTB &= ~_BV(PORTB4); //put it to low
+        return;
+    }
+    PORTD |= (1<<PORTD5);
+    //PORTB |= _BV(PORTB4);
+    return;
+}
+
diff --git a/parallel_led/arduinolib.epi b/parallel_led/arduinolib.epi
new file mode 100644
index 0000000..fc4a16f
--- /dev/null
+++ b/parallel_led/arduinolib.epi
@@ -0,0 +1,2 @@
+fun dwrite(p:int; v:bool) returns ()
+
diff --git a/parallel_led/arduinolib.h b/parallel_led/arduinolib.h
new file mode 100644
index 0000000..74ec448
--- /dev/null
+++ b/parallel_led/arduinolib.h
@@ -0,0 +1 @@
+#include "arduinolib_types.h"
diff --git a/parallel_led/arduinolib_types.h b/parallel_led/arduinolib_types.h
new file mode 100644
index 0000000..0570697
--- /dev/null
+++ b/parallel_led/arduinolib_types.h
@@ -0,0 +1,11 @@
+#ifndef ARDUINOLIB_H
+#define ARDUINOLIB_H
+//#include "Arduino.h"
+//#include "WConstants.h"
+/* Example of a combinatorial function */
+typedef struct Arduinolib__dwrite {
+} Arduinolib__dwrite_out;
+
+void Arduinolib__dwrite_step(int p, int v,Arduinolib__dwrite_out *o);
+
+#endif
diff --git a/led.c b/parallel_led/led.c
similarity index 100%
rename from led.c
rename to parallel_led/led.c
diff --git a/parallel_led/main.c b/parallel_led/main.c
new file mode 100644
index 0000000..6b0d724
--- /dev/null
+++ b/parallel_led/main.c
@@ -0,0 +1,17 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include "main.h"
+
+//#define BLINK_DELAY_MS 4000
+
+int main (void)
+{
+ Prog__main_mem mem;
+ Prog__main_reset(&mem);
+ while(1){
+     Prog__main_out _res;
+     Prog__main_step(&_res, &mem);
+    _delay_ms(1000);
+}
+return 0;
+}
\ No newline at end of file
diff --git a/parallel_led/main.h b/parallel_led/main.h
new file mode 100644
index 0000000..7269ffa
--- /dev/null
+++ b/parallel_led/main.h
@@ -0,0 +1,4 @@
+#ifndef MAIN_H
+#define MAIN_H
+#include "prog_c/prog.h"
+#endif
diff --git a/parallel_led/prog.ept b/parallel_led/prog.ept
new file mode 100644
index 0000000..47175e7
--- /dev/null
+++ b/parallel_led/prog.ept
@@ -0,0 +1,24 @@
+open Arduinolib
+
+node led<<period, ledMax : int; opin : int>>() returns ()
+var i : int;
+    ledTime : int;
+    upt : bool;
+    downt : bool;
+
+let
+    i = 0 fby (i+1);
+    ledTime = i % period;
+    upt = ledTime < ledMax;
+    downt = not upt;
+
+    () = dwrite((opin, true) when upt);
+    () = dwrite((opin, false) when downt);
+tel
+
+node main() returns ()
+let
+  () = led<<3, 1, 13>>();
+  () = led<<4, 2, 9>>();
+tel
+
diff --git a/prog.ept b/prog.ept
index e349a16..19088e4 100644
--- a/prog.ept
+++ b/prog.ept
@@ -1,24 +1,10 @@
 open Arduinolib
 
-node led<<period, ledMax : int; opin : int>>() returns ()
-var i : int;
-    ledTime : int;
-    upt : bool;
-    downt : bool;
-
-let
-    i = 0 fby (i+1);
-    ledTime = i % period;
-    upt = ledTime < ledMax;
-    downt = not upt;
-
-    () = dwrite((opin, true) when upt);
-    () = dwrite((opin, false) when downt);
-tel
-
 node main() returns ()
-let
-  () = led<<4, 2, 13>>();
-  () = led<<3, 1, 9>>();
+var i : int;
+let 
+  i = 0 fby (i+1);
+  () = dinit();
+  () = lcd_init();
 tel