commit aad2cc40d4e2dfc6e4ec86595f5d7dcdc7533f36
Author: Arnaud <tzim@carenath.tzim.net>
Date:   Fri Apr 29 11:30:56 2016 +0200

    Ajout initial

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a36911e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,228 @@
+# Arduino makefile
+#
+# This makefile allows you to build sketches from the command line
+# without the Arduino environment (or Java).
+#
+# The Arduino environment does preliminary processing on a sketch before
+# compiling it.  If you're using this makefile instead, you'll need to do
+# a few things differently:
+#
+#   - Give your program's file a .cpp extension (e.g. foo.cpp).
+#
+#   - Put this line at top of your code: #include <WProgram.h>
+#
+#   - Write prototypes for all your functions (or define them before you
+#     call them).  A prototype declares the types of parameters a
+#     function will take and what type of value it will return.  This
+#     means that you can have a call to a function before the definition
+#     of the function.  A function prototype looks like the first line of
+#     the function, with a semi-colon at the end.  For example:
+#     int digitalRead(int pin);
+#
+# Instructions for using the makefile:
+#
+#  1. Copy this file into the folder with your sketch.
+#
+#  2. Below, modify the line containing "TARGET" to refer to the name of
+#     of your program's file without an extension (e.g. TARGET = foo).
+#
+#  3. Modify the line containg "ARDUINO" to point the directory that
+#     contains the Arduino core (for normal Arduino installations, this
+#     is the lib/targets/arduino sub-directory).
+#
+#  4. Modify the line containing "PORT" to refer to the filename
+#     representing the USB or serial connection to your Arduino board
+#     (e.g. PORT = /dev/tty.USB0).  If the exact name of this file
+#     changes, you can use * as a wildcard (e.g. PORT = /dev/tty.USB*).
+#
+#  5. At the command line, change to the directory containing your
+#     program's file and the makefile.
+#
+#  6. Type "make" and press enter to compile/verify your program.
+#
+#  7. Type "make upload", reset your Arduino board, and press enter  to
+#     upload your program to the Arduino board.
+#
+# $Id$
+
+#Bootloader Port
+PORT = /dev/ttyU0
+# /dev/serial/by-id/usb-Arduino_LLC_Arduino_Micro-if00
+#Device Port (for autoreset)
+RESETPORT = /dev/ttyU0
+#/dev/serial/by-id/usb-Loupiottes.fr_DMXv3_Micro-if00
+
+
+TARGET = sonde
+SRC = main.c debug.c analog.c rf24.c spi.c lib/Hamming.c lib/HammingCalculateParitySmallAndFast.c onewire.c
+CXXSRC =
+ASRC = uart.S
+MCU = attiny84a
+F_CPU = 8000000L
+FORMAT = ihex
+UPLOAD_RATE = 20000
+
+# Name of this Makefile (used for "make depend").
+MAKEFILE = Makefile
+
+# Debugging format.
+# Native formats for AVR-GCC's -g are stabs [default], or dwarf-2.
+# AVR (extended) COFF requires stabs, plus an avr-objcopy run.
+DEBUG = stabs
+
+OPT = s -ffunction-sections -fdata-sections -finline-functions -finline-functions-called-once -finline-small-functions -fmerge-constants -fomit-frame-pointer
+
+# Place -D or -U options here
+CDEFS = -DF_CPU=$(F_CPU)
+CXXDEFS = -DF_CPU=$(F_CPU)
+
+# Place -I options here
+CINCS = -Ilib
+CXXINCS = -Ilib
+
+# Compiler flag to set the C Standard level.
+# c89   - "ANSI" C
+# gnu89 - c89 plus GCC extensions
+# c99   - ISO C99 standard (not yet fully implemented)
+# gnu99 - c99 plus GCC extensions
+CSTANDARD = -std=gnu99
+CDEBUG = -g$(DEBUG)
+CWARN = -Wall
+CTUNING = -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+#CEXTRA = -Wa,-adhlns=$(<:.c=.lst)
+
+CFLAGS = $(CDEFS) $(CINCS) -O$(OPT) $(CWARN) $(CSTANDARD) $(CEXTRA)
+CXXFLAGS = $(CDEFS) $(CINCS) -O$(OPT) -fno-exceptions
+#ASFLAGS = -Wa,-adhlns=$(<:.S=.lst),-gstabs
+LDFLAGS = -lm -Wl,--gc-sections
+
+
+# Programming support using avrdude. Settings and variables.
+AVRDUDE_PROGRAMMER = linuxspi
+AVRDUDE_PORT = /dev/spidev0.0
+AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex:i
+AVRDUDE_FLAGS = -F -pattiny84 -P$(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER) -b $(UPLOAD_RATE)
+
+# Program settings
+CC = avr-gcc
+CXX = avr-g++
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+NM = avr-nm
+AVRDUDE = avrdude
+REMOVE = rm -f
+MV = mv -f
+
+OPATH = /tmp/sbuild
+
+# Define all object files.
+OBJ = $(SRC:%.c=$(OPATH)/%.c.o) $(CXXSRC:.cpp=$(OPATH)/%.cpp.o) $(ASRC:%.S=$(OPATH)/%.S.o)
+
+# Define all listing files.
+LST = $(ASRC:.S=.lst) $(CXXSRC:.cpp=.lst) $(SRC:.c=.lst)
+
+# Combine all necessary flags and optional flags.
+# Add target processor to flags.
+ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS)
+ALL_CXXFLAGS = -mmcu=$(MCU) -I. $(CXXFLAGS)
+ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)
+
+
+# Default target.
+all: $(OPATH) $(OPATH)/lib build
+
+build: elf hex eep
+
+elf: $(TARGET).elf
+hex: $(TARGET).hex
+eep: $(TARGET).eep
+lss: $(TARGET).lss
+sym: $(TARGET).sym
+
+
+# Program the device.
+upload: $(TARGET).hex $(TARGET).eep
+	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)
+
+
+# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
+COFFCONVERT=$(OBJCOPY) --debugging \
+--change-section-address .data-0x800000 \
+--change-section-address .bss-0x800000 \
+--change-section-address .noinit-0x800000 \
+--change-section-address .eeprom-0x810000
+
+
+coff: $(TARGET).elf
+	$(COFFCONVERT) -O coff-avr $(TARGET).elf $(TARGET).cof
+
+
+extcoff: $(TARGET).elf
+	$(COFFCONVERT) -O coff-ext-avr $(TARGET).elf $(TARGET).cof
+
+
+.SUFFIXES: .elf .hex .eep .lss .sym
+
+.elf.hex:
+	$(OBJCOPY) -O $(FORMAT) -R .eeprom $< $@
+
+.elf.eep:
+	-$(OBJCOPY) -O $(FORMAT) -j .eeprom --set-section-flags=.eeprom=alloc,load \
+	--no-change-warnings --change-section-lma .eeprom=0 $< $@
+
+# Create extended listing file from ELF output file.
+.elf.lss:
+	$(OBJDUMP) -h -S $< > $@
+
+# Create a symbol table from ELF output file.
+.elf.sym:
+	$(NM) -n $< > $@
+
+
+
+# Link: create ELF output file from object files.
+$(TARGET).elf: $(OBJ)
+	$(CC) $(ALL_CFLAGS) $(OBJ) --output $@ $(LDFLAGS)
+	$(SIZE) -C --mcu=$(MCU) $@
+
+
+# Compile: create object files from C++ source files.
+$(OPATH)/%.cpp.o: %.cpp
+	$(CXX) -c -g $(ALL_CXXFLAGS) $< -o $@
+
+# Compile: create object files from C source files.
+$(OPATH)/%.c.o: %.c
+	$(CC) -c -g $(ALL_CFLAGS) $< -o $@
+
+
+# Compile: create assembler files from C source files.
+%.c.s: %.c
+	$(CC) -S $(ALL_CFLAGS) $< -o $@
+
+
+# Assemble: create object files from assembler source files.
+$(OPATH)/%.S.o: %.S
+	$(CC) -c $(ALL_ASFLAGS) $< -o $@
+
+$(OPATH) $(OPATH)/lib:
+	@mkdir -p $@
+
+# Target: clean project.
+clean:
+	$(REMOVE) $(TARGET).hex $(TARGET).eep $(TARGET).cof $(TARGET).elf \
+	$(TARGET).map $(TARGET).sym $(TARGET).lss \
+	$(OBJ) $(LST) $(SRC:.c=.s) $(SRC:.c=.d) $(CXXSRC:.cpp=.s) $(CXXSRC:.cpp=.d)
+
+depend:
+	if grep '^# DO NOT DELETE' $(MAKEFILE) >/dev/null; \
+	then \
+		sed -e '/^# DO NOT DELETE/,$$d' $(MAKEFILE) > \
+			$(MAKEFILE).$$$$ && \
+		$(MV) $(MAKEFILE).$$$$ $(MAKEFILE); \
+	fi
+	echo '# DO NOT DELETE THIS LINE -- make depend depends on it.' \
+		>> $(MAKEFILE); \
+	$(CC) -M -mmcu=$(MCU) $(CDEFS) $(CINCS) $(SRC) $(ASRC) >> $(MAKEFILE)
+
+.PHONY:	all build elf hex eep lss sym program coff extcoff clean depend
diff --git a/analog.c b/analog.c
new file mode 100644
index 0000000..a851376
--- /dev/null
+++ b/analog.c
@@ -0,0 +1,87 @@
+#include <avr/sleep.h>
+#include <avr/power.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/eeprom.h>
+#include "analog.h"
+
+
+#define EE_Ref 1 // 4395600L;
+
+unsigned long refval =0;// = 4395600L;
+
+void initADC(){
+    bitClear(PRR,PRADC); // clearing the ADC Power Reduction bit
+//    bitSet(ADCSRA,ADEN);
+    ADCSRA = _BV(ADEN)|_BV(ADPS2)|_BV(ADPS1)|_BV(ADPS0);
+}
+
+void stopADC(){
+   bitClear(ADCSRA,ADEN);
+   bitSet(PRR,PRADC);
+}
+
+static volatile byte ADC_complete;
+ISR(ADC_vect) { ADC_complete = true; }
+
+long readADC(){
+  set_sleep_mode(SLEEP_MODE_ADC);
+  ADCSRA |= _BV(ADIE);
+  ADC_complete=false;
+  sleep_enable();
+  while(!ADC_complete){sei(); sleep_cpu(); }
+  sleep_disable();
+  return ADC;
+}
+
+void readref(){
+    refval = eeprom_read_dword((const uint32_t *)EE_Ref);
+}
+
+long readVcc() {
+  if(refval==0) readref();
+  long result = 0;
+  // Read 1.1V reference against AVcc
+  ADMUX =  _BV(MUX5) | _BV(MUX0);
+  _delay_ms(1); // Wait for Vref to settle
+  uint8_t i=16 ;
+  while(i--) result += readADC();
+  result >>= 2;
+  //result = 4418850L / result; // Back-calculate AVcc in mV
+  result = refval / result;
+  return result;
+}
+
+
+long readtemp(){
+
+  // Temp at ADC2, TempVcc at PA3
+  // switch PA3 on
+  bitSet(TEMP_SENSOR_VCC_DDR,TEMP_SENSOR_VCC_BIT);
+  bitSet(TEMP_SENSOR_VCC_PORT,TEMP_SENSOR_VCC_BIT);
+
+  long vref=readVcc();
+  ADMUX = TEMP_SENSOR_ADMUX;
+  //_delay_ms(1); // Wait for LTM86 to settle
+  readADC();
+  long res =0;
+  uint8_t cpt =16;
+  while (cpt--) res+= readADC();
+  res >>= 2;
+
+   long temp = vref * res / 4096 ;
+
+ //   temp = (sqrt(118.548544+0.01388*(1777.3-temp))-10.888)*144.09221902 + 30;
+//   Serial.print("TEMP ");Serial.println(temp);
+//   digitalWrite(tempvcc,HIGH);
+
+  // Stop Sensor
+  bitClear(TEMP_SENSOR_VCC_PORT,TEMP_SENSOR_VCC_BIT);
+//  bitClear(TEMP_SENSOR_VCC_DDR,TEMP_SENSOR_VCC_BIT);
+
+   return temp;
+}
+
+float calctemp(long t){
+    return (sqrt(118.548544+0.01388*(1777.3-t))-10.888)*144.09221902 + 30;
+}
diff --git a/analog.h b/analog.h
new file mode 100644
index 0000000..cbc8ae1
--- /dev/null
+++ b/analog.h
@@ -0,0 +1,25 @@
+#include "defines.h"
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#define TEMP_SENSOR_VCC_DDR DDRB
+#define TEMP_SENSOR_VCC_PORT PORTB
+#define TEMP_SENSOR_VCC_BIT PB1
+
+#define TEMP_SENSOR_ADMUX ( _BV(MUX1) | _BV(MUX0) ) // ADC3 / PA3
+
+
+
+void initADC();
+void stopADC();
+long readADC();
+
+long readVcc();
+long readtemp();
+float calctemp(long t);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
diff --git a/crc8.h b/crc8.h
new file mode 100644
index 0000000..64011ba
--- /dev/null
+++ b/crc8.h
@@ -0,0 +1,17 @@
+static __inline__ uint8_t
+_crc8_ccitt_update(uint8_t __crc, uint8_t __data)
+{
+    uint8_t __i, __pattern;
+    __asm__ __volatile__ (
+        "    eor    %0, %4" "\n\t"
+        "    ldi    %1, 8" "\n\t"
+        "    ldi    %2, 0x07" "\n\t"
+        "1:  lsl    %0" "\n\t"
+        "    brcc   2f" "\n\t"
+        "    eor    %0, %2" "\n\t"
+        "2:  dec    %1" "\n\t"
+        "    brne   1b" "\n\t"
+        : "=r" (__crc), "=d" (__i), "=d" (__pattern)
+        : "0" (__crc), "r" (__data));
+    return __crc;
+}
diff --git a/debug.c b/debug.c
new file mode 100644
index 0000000..5a378db
--- /dev/null
+++ b/debug.c
@@ -0,0 +1,16 @@
+#include "debug.h"
+
+
+void debug (char* ptr) {
+	while (*ptr) SerialPutChar(*(ptr++));
+}
+
+void debughex (char* ptr,uint8_t len) {
+	while (len--) {
+		uint8_t c = *(ptr++);
+	    uint8_t ch= c>>4;
+	    c &= 0x0F;
+	    SerialPutChar(ch>9?ch+'A'-10:ch+'0');
+	    SerialPutChar(c>9?c+'A'-10:c+'0');
+	}
+}
diff --git a/debug.h b/debug.h
new file mode 100644
index 0000000..eaaca0e
--- /dev/null
+++ b/debug.h
@@ -0,0 +1,7 @@
+#include "uart.h"
+#include <stdint.h>
+#define DEBUG 1
+
+
+void debug (char* ptr);
+void debughex (char* ptr,uint8_t len);
diff --git a/defines.h b/defines.h
new file mode 100644
index 0000000..1a30381
--- /dev/null
+++ b/defines.h
@@ -0,0 +1,47 @@
+#ifndef defines_h
+#define defines_h
+
+#include <stdbool.h>
+typedef unsigned int word;
+
+#define bit(b) (1UL << (b))
+
+typedef uint8_t boolean;
+
+typedef uint8_t byte;
+
+#define HIGH 0x1
+#define LOW  0x0
+
+
+#define PI 3.1415926535897932384626433832795
+#define HALF_PI 1.5707963267948966192313216916398
+#define TWO_PI 6.283185307179586476925286766559
+#define DEG_TO_RAD 0.017453292519943295769236907684886
+#define RAD_TO_DEG 57.295779513082320876798154814105
+
+#define min(a,b) ((a)<(b)?(a):(b))
+#define max(a,b) ((a)>(b)?(a):(b))
+//#define abs(x) ((x)>0?(x):-(x))
+#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
+#define radians(deg) ((deg)*DEG_TO_RAD)
+#define degrees(rad) ((rad)*RAD_TO_DEG)
+#define sq(x) ((x)*(x))
+
+#define interrupts() sei()
+#define noInterrupts() cli()
+
+#define lowByte(w) ((uint8_t) ((w) & 0xff))
+#define highByte(w) ((uint8_t) ((w) >> 8))
+
+#define bitRead(value, bit) (((value) >> (bit)) & 0x01)
+#define bitSet(value, bit) ((value) |= (1UL << (bit)))
+#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
+#define bitWrite(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit))
+
+void setup(void);
+void loop(void);
+
+
+
+#endif
diff --git a/dht11.c b/dht11.c
new file mode 100644
index 0000000..fb1a2f4
--- /dev/null
+++ b/dht11.c
@@ -0,0 +1,79 @@
+#include "dht11.h"
+#include <inttypes.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "defines.h"
+
+int dht11_humidity;
+int dht11_temperature;
+
+int dht11_read(){
+
+    // Init Timer1 for timekeeping
+    TIMSK1=0; // no interrupt
+    TCNT1 = 0; // start at 0
+    TCCR1A = 0; // nothing to do w timer
+    TCCR1B = _BV(CS11); // start w 1us tick 
+
+// BUFFER TO RECEIVE
+    uint8_t bits[5];
+    uint8_t cnt = 7;
+    uint8_t idx = 0;
+
+    // EMPTY BUFFER
+    for (int i=0; i< 5; i++) bits[i] = 0;
+// REQUEST SAMPLE
+    bitSet(DHT11_DDDR,DHT11_DBIT); //pinMode(pin, OUTPUT);
+    bitSet(DHT11_DPORT,DHT11_DBIT); // digitalWrite(pin, HIGH);
+    _delay_ms(30);
+    bitClear(DHT11_DPORT,DHT11_DBIT); //digitalWrite(pin, LOW);
+    _delay_ms(18);
+    bitSet(DHT11_DPORT,DHT11_DBIT); // digitalWrite(pin, HIGH);
+    _delay_us(20);
+    bitClear(DHT11_DDDR,DHT11_DBIT); //pinMode(pin, INPUT);
+    bitSet(DHT11_DPORT,DHT11_DBIT);
+
+    // ACKNOWLEDGE or TIMEOUT
+    unsigned int loopCnt = 10000;
+    while( bitRead(DHT11_DPIN,DHT11_DBIT) == LOW)
+	if (loopCnt-- == 0) return DHT11_ERROR_TIMEOUT2;
+
+    loopCnt = 10000;
+    while( bitRead(DHT11_DPIN,DHT11_DBIT) == HIGH)
+	if (loopCnt-- == 0) return DHT11_ERROR_TIMEOUT2;
+
+    // READ OUTPUT - 40 BITS => 5 BYTES or TIMEOUT
+    for (int i=0; i<40; i++)
+    {
+	loopCnt = 10000;
+	while(bitRead(DHT11_DPIN,DHT11_DBIT) == LOW)
+	    if (loopCnt-- == 0) return DHT11_ERROR_TIMEOUT;
+
+	unsigned long t = TCNT1;
+
+
+	loopCnt = 10000;
+	while(bitRead(DHT11_DPIN,DHT11_DBIT) == HIGH)
+	    if (loopCnt-- == 0) return DHT11_ERROR_TIMEOUT;
+
+	unsigned long t2 = TCNT1;
+
+	if ((t2 - t) > 40) bits[idx] |= (1 << cnt);
+	if (cnt == 0)   // next byte?
+	{
+	    cnt = 7;    // restart at MSB
+	    idx++;      // next byte!
+	}
+	else cnt--;
+    }
+
+    // WRITE TO RIGHT VARS
+        // as bits[1] and bits[3] are allways zero they are omitted in formulas.
+    dht11_humidity    = bits[0]; 
+    dht11_temperature = bits[2]; 
+
+    uint8_t sum = bits[0] + bits[2];  
+
+    if (bits[4] != sum) return DHT11_ERROR_CHECKSUM;
+    return DHT11_OK;
+}
diff --git a/dht11.h b/dht11.h
new file mode 100644
index 0000000..94f8d1a
--- /dev/null
+++ b/dht11.h
@@ -0,0 +1,22 @@
+
+#define DHT11_OK				0
+#define DHT11_ERROR_CHECKSUM	-1
+#define DHT11_ERROR_TIMEOUT	-2
+#define DHT11_ERROR_TIMEOUT2	-3
+
+#define DHT11_DPIN PINB
+#define DHT11_DDDR DDRB
+#define DHT11_DPORT PORTB
+#define DHT11_DBIT PB2
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+extern int dht11_humidity;
+extern int dht11_temperature;
+int dht11_read();
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
diff --git a/eeprom b/eeprom
new file mode 100644
index 0000000..44a49a3
--- /dev/null
+++ b/eeprom
@@ -0,0 +1 @@
+0x03,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x3f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x1f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xf,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff
diff --git a/eeprom.bin b/eeprom.bin
new file mode 100644
index 0000000..28037ec
Binary files /dev/null and b/eeprom.bin differ
diff --git a/lib/Hamming.c b/lib/Hamming.c
new file mode 100644
index 0000000..cb1fba3
--- /dev/null
+++ b/lib/Hamming.c
@@ -0,0 +1,174 @@
+/*
+Hamming Error-Correcting Code (ECC)
+Optimized for avr-gcc 4.8.1 in Atmel AVR Studio 6.2
+August 12, 2014
+
+You should include Hamming.c, Hamming.h, and only one of the other Hamming files in your project.
+The other Hamming files implement the same methods in different ways, that may be better or worse for your needs.
+
+This was created for LoFi in the TheHackadayPrize contest.
+http://hackaday.io/project/1552-LoFi
+
+Copyright 2014 David Cook
+RobotRoom.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include <avr/pgmspace.h>
+
+#include "Hamming.h"
+
+/****************************/
+/*                          */
+/* Constants and structures */
+/*                          */
+/****************************/
+
+#ifndef null
+#define null ((void*) 0)
+#endif
+
+// If transmitting/writing only, you don't need to include this file.
+// If receiving/reading, then this provides the methods to correct bit errors.
+
+#define UNCORRECTABLE	0xFF
+#define ERROR_IN_PARITY	0xFE
+#define NO_ERROR		0x00
+
+
+/****************************/
+/*                          */
+/*     Global variables     */
+/*                          */
+/****************************/
+
+// Private table. Faster and more compact than multiple if statements.
+static const byte _hammingCorrect128Syndrome[16] PROGMEM =
+{
+	NO_ERROR,			// 0
+	ERROR_IN_PARITY,	// 1
+	ERROR_IN_PARITY,	// 2
+	0x01,				// 3
+	ERROR_IN_PARITY,	// 4
+	0x02,				// 5
+	0x04,				// 6
+	0x08,				// 7
+	ERROR_IN_PARITY,	// 8
+	0x10,				// 9
+	0x20,				// 10
+	0x40,				// 11
+	0x80,				// 12
+	UNCORRECTABLE,		// 13
+	UNCORRECTABLE,		// 14
+	UNCORRECTABLE,		// 15
+};
+
+/****************************/
+/*                          */
+/*      Private methods     */
+/*                          */
+/****************************/
+
+// Give a pointer to a received byte,
+// and given a nibble difference in parity (parity ^ calculated parity)
+// this will correct the received byte value if possible.
+// It returns the number of bits corrected:
+// 0 means no errors
+// 1 means one corrected error
+// 3 means corrections not possible
+static byte HammingCorrect128Syndrome(byte* value, byte syndrome)
+{
+	// Using only the lower nibble (& 0x0F), look up the bit
+	// to correct in a table
+	byte correction = pgm_read_byte(&(_hammingCorrect128Syndrome[syndrome & 0x0F]));
+
+	if (correction != NO_ERROR)
+	{
+		if (correction == UNCORRECTABLE || value == null)
+		{
+			return 3; // Non-recoverable error
+		}
+		else
+		{
+			if ( correction != ERROR_IN_PARITY)
+			{
+				*value ^= correction;
+			}
+
+			return 1; // 1-bit recoverable error;
+		}
+	}
+
+	return 0; // No errors
+}
+
+
+/****************************/
+/*                          */
+/*      Public  methods     */
+/*                          */
+/****************************/
+
+// Given a pointer to a received byte and the received parity (as a lower nibble),
+// this calculates what the parity should be and fixes the received value if needed.
+// It returns the number of bits corrected:
+// 0 means no errors
+// 1 means one corrected error
+// 3 means corrections not possible
+byte HammingCorrect128(byte* value, nibble parity)
+{
+	byte syndrome;
+
+	if (value == null)
+	{
+		return 3; // Non-recoverable error
+	}
+
+	syndrome = HammingCalculateParity128(*value) ^ parity;
+
+	if (syndrome != 0)
+	{
+		return HammingCorrect128Syndrome(value, syndrome);
+	}
+
+	return 0; // No errors
+}
+
+
+// Given a pointer to a first value and a pointer to a second value and
+// their combined given parity (lower nibble first parity, upper nibble second parity),
+// this calculates what the parity should be and fixes the values if needed.
+// It returns the number of bits corrected:
+// 0 means no errors
+// 1 means one corrected error
+// 2 means two corrected errors
+// 3 means corrections not possible
+byte HammingCorrect2416(byte* first, byte* second, byte parity)
+{
+	byte syndrome;
+
+	if (first == null || second == null)
+	{
+		return 3; // Non-recoverable error
+	}
+
+	syndrome = HammingCalculateParity2416(*first, *second) ^ parity;
+
+	if (syndrome != 0)
+	{
+		return HammingCorrect128Syndrome(first, syndrome) + HammingCorrect128Syndrome(second, syndrome >> 4);
+	}
+
+	return 0; // No errors
+}
diff --git a/lib/Hamming.h b/lib/Hamming.h
new file mode 100644
index 0000000..7778a59
--- /dev/null
+++ b/lib/Hamming.h
@@ -0,0 +1,68 @@
+/*
+Hamming Error-Correcting Code (ECC)
+Optimized for avr-gcc 4.8.1 in Atmel AVR Studio 6.2
+August 12, 2014
+
+You should include Hamming.c, Hamming.h, and only one of the other Hamming files in your project.
+The other Hamming files implement the same methods in different ways, that may be better or worse for your needs.
+
+This was created for LoFi in the TheHackadayPrize contest.
+http://hackaday.io/project/1552-LoFi
+
+Copyright 2014 David Cook
+RobotRoom.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#ifndef _HAMMING_H
+#define _HAMMING_H
+
+#ifndef _AVR_H
+typedef unsigned char byte;
+typedef unsigned char nibble;
+#endif
+
+/**** These are needed to transmit and receive ****/
+
+// Given a byte to transmit, this returns the parity as a nibble
+nibble HammingCalculateParity128(byte value);
+
+// Given two bytes to transmit, this returns the parity
+// as a byte with the lower nibble being for the first byte,
+// and the upper nibble being for the second byte.
+byte HammingCalculateParity2416(byte first, byte second);
+
+
+
+/**** These are needed only to receive ****/
+
+// Given a pointer to a received byte and the received parity (as a lower nibble),
+// this calculates what the parity should be and fixes the received value if needed.
+// It returns the number of bits corrected:
+// 0 means no errors
+// 1 means one corrected error
+// 3 means corrections not possible
+byte HammingCorrect128(byte* value, nibble parity);
+
+// Given a pointer to a first value and a pointer to a second value and
+// their combined given parity (lower nibble first parity, upper nibble second parity),
+// this calculates what the parity should be and fixes the values if needed.
+// It returns the number of bits corrected:
+// 0 means no errors
+// 1 means one corrected error
+// 2 means two corrected errors
+// 3 means corrections not possible
+byte HammingCorrect2416(byte* first, byte* second, byte parity);
+
+#endif // _HAMMING_H
diff --git a/lib/HammingCalculateParityFast.c b/lib/HammingCalculateParityFast.c
new file mode 100644
index 0000000..6cc5df6
--- /dev/null
+++ b/lib/HammingCalculateParityFast.c
@@ -0,0 +1,67 @@
+/*
+Hamming Error-Correcting Code (ECC)
+Optimized for avr-gcc 4.8.1 in Atmel AVR Studio 6.2
+August 12, 2014
+
+You should include Hamming.c, Hamming.h, and only one of the other Hamming files in your project.
+The other Hamming files implement the same methods in different ways, that may be better or worse for your needs.
+
+This was created for LoFi in the TheHackadayPrize contest.
+http://hackaday.io/project/1552-LoFi
+
+Copyright 2014 David Cook
+RobotRoom.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include <avr/pgmspace.h>
+
+#include "Hamming.h"
+
+
+// This contains all of the precalculated parity values for a byte (8 bits).
+// This is very fast, but takes up more program space than calculating on the fly.
+static const byte _hammingCalculateParityFast128[256] PROGMEM =
+{
+	 0,  3,  5,  6,  6,  5,  3,  0,  7,  4,  2,  1,  1,  2,  4,  7,
+	 9, 10, 12, 15, 15, 12, 10,  9, 14, 13, 11,  8,  8, 11, 13, 14,
+	10,  9, 15, 12, 12, 15,  9, 10, 13, 14,  8, 11, 11,  8, 14, 13,
+	 3,  0,  6,  5,  5,  6,  0,  3,  4,  7,  1,  2,  2,  1,  7,  4,
+	11,  8, 14, 13, 13, 14,  8, 11, 12, 15,  9, 10, 10,  9, 15, 12,
+	 2,  1,  7,  4,  4,  7,  1,  2,  5,  6,  0,  3,  3,  0,  6,  5,
+	 1,  2,  4,  7,  7,  4,  2,  1,  6,  5,  3,  0,  0,  3,  5,  6,
+	 8, 11, 13, 14, 14, 13, 11,  8, 15, 12, 10,  9,  9, 10, 12, 15,
+	12, 15,  9, 10, 10,  9, 15, 12, 11,  8, 14, 13, 13, 14,  8, 11,
+	 5,  6,  0,  3,  3,  0,  6,  5,  2,  1,  7,  4,  4,  7,  1,  2,
+	 6,  5,  3,  0,  0,  3,  5,  6,  1,  2,  4,  7,  7,  4,  2,  1,
+	15, 12, 10,  9,  9, 10, 12, 15,  8, 11, 13, 14, 14, 13, 11,  8,
+	 7,  4,  2,  1,  1,  2,  4,  7,  0,  3,  5,  6,  6,  5,  3,  0,
+	14, 13, 11,  8,  8, 11, 13, 14,  9, 10, 12, 15, 15, 12, 10,  9,
+	13, 14,  8, 11, 11,  8, 14, 13, 10,  9, 15, 12, 12, 15,  9, 10,
+	 4,  7,  1,  2,  2,  1,  7,  4,  3,  0,  6,  5,  5,  6,  0,  3,
+};
+
+// Given a byte to transmit, this returns the parity as a nibble
+nibble HammingCalculateParity128(byte value)
+{
+	return pgm_read_byte(&(_hammingCalculateParityFast128[value]));
+}
+
+// Given two bytes to transmit, this returns the parity
+// as a byte with the lower nibble being for the first byte,
+// and the upper nibble being for the second byte.
+byte HammingCalculateParity2416(byte first, byte second)
+{
+	return (pgm_read_byte(&(_hammingCalculateParityFast128[second]))<<4) | pgm_read_byte(&(_hammingCalculateParityFast128[first]));
+}
diff --git a/lib/HammingCalculateParitySmall.c b/lib/HammingCalculateParitySmall.c
new file mode 100644
index 0000000..d446f8f
--- /dev/null
+++ b/lib/HammingCalculateParitySmall.c
@@ -0,0 +1,99 @@
+/*
+Hamming Error-Correcting Code (ECC)
+Optimized for avr-gcc 4.8.1 in Atmel AVR Studio 6.2
+August 12, 2014
+
+You should include Hamming.c, Hamming.h, and only one of the other Hamming files in your project.
+The other Hamming files implement the same methods in different ways, that may be better or worse for your needs.
+
+This was created for LoFi in the TheHackadayPrize contest.
+http://hackaday.io/project/1552-LoFi
+
+Copyright 2014 David Cook
+RobotRoom.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "Hamming.h"
+
+/****************************/
+/*                          */
+/*      Public  methods     */
+/*                          */
+/****************************/
+
+// This is slower than using a table, but faster than
+// using the textbook method.
+
+// Given a byte to transmit, this returns the parity as a nibble
+nibble HammingCalculateParity128(byte value)
+{
+	// Exclusive OR is associative and commutative, so order of operations and values does not matter.
+	nibble parity;
+
+	if ( ( value & 1 ) != 0 )
+	{
+		parity = 0x3;
+	}
+	else
+	{
+		parity = 0x0;
+	}
+
+	if ( ( value & 2 ) != 0 )
+	{
+		parity ^= 0x5;
+	}
+
+	if ( ( value & 4 ) != 0 )
+	{
+		parity ^= 0x6;
+	}
+
+	if ( ( value & 8 ) != 0 )
+	{
+		parity ^= 0x7;
+	}
+
+	if ( ( value & 16 ) != 0 )
+	{
+		parity ^= 0x9;
+	}
+
+	if ( ( value & 32 ) != 0 )
+	{
+		parity ^= 0xA;
+	}
+
+	if ( ( value & 64 ) != 0 )
+	{
+		parity ^= 0xB;
+	}
+
+	if ( ( value & 128 ) != 0 )
+	{
+		parity ^= 0xC;
+	}
+
+	return parity;
+}
+
+// Given two bytes to transmit, this returns the parity
+// as a byte with the lower nibble being for the first byte,
+// and the upper nibble being for the second byte.
+byte HammingCalculateParity2416(byte first, byte second)
+{
+	return (HammingCalculateParity128(second) << 4) | HammingCalculateParity128(first);
+}
+
diff --git a/lib/HammingCalculateParitySmallAndFast.c b/lib/HammingCalculateParitySmallAndFast.c
new file mode 100644
index 0000000..ad27bf8
--- /dev/null
+++ b/lib/HammingCalculateParitySmallAndFast.c
@@ -0,0 +1,64 @@
+/*
+Hamming Error-Correcting Code (ECC)
+Optimized for avr-gcc 4.8.1 in Atmel AVR Studio 6.2
+August 12, 2014
+
+You should include Hamming.c, Hamming.h, and only one of the other Hamming files in your project.
+The other Hamming files implement the same methods in different ways, that may be better or worse for your needs.
+
+This was created for LoFi in the TheHackadayPrize contest.
+http://hackaday.io/project/1552-LoFi
+
+Copyright 2014 David Cook
+RobotRoom.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include <avr/pgmspace.h>
+
+#include "Hamming.h"
+
+/****************************/
+/*                          */
+/*     Global variables     */
+/*                          */
+/****************************/
+
+// This contains all of the precalculated parity values for a nibble (4 bits).
+static const byte _hammingCalculateParityLowNibble[] PROGMEM =
+{ 0,  3,  5,  6,  6,  5,  3,  0,  7,  4,  2,  1,  1,  2,  4,  7 };
+
+static const byte _hammingCalculateParityHighNibble[] PROGMEM =
+{ 0,  9, 10,  3, 11,  2,  1,  8, 12,  5,  6, 15,  7, 14, 13,  4 };
+
+
+/****************************/
+/*                          */
+/*      Public  methods     */
+/*                          */
+/****************************/
+
+// Given a byte to transmit, this returns the parity as a nibble
+nibble HammingCalculateParity128(byte value)
+{
+	return pgm_read_byte(&(_hammingCalculateParityLowNibble[value&0x0F])) ^ pgm_read_byte(&(_hammingCalculateParityHighNibble[value >> 4]));
+}
+
+// Given two bytes to transmit, this returns the parity
+// as a byte with the lower nibble being for the first byte,
+// and the upper nibble being for the second byte.
+byte HammingCalculateParity2416(byte first, byte second)
+{
+	return HammingCalculateParity128(second) << 4 | HammingCalculateParity128(first);
+}
diff --git a/lib/HammingCalculateParityTextbook.c b/lib/HammingCalculateParityTextbook.c
new file mode 100644
index 0000000..08e5cca
--- /dev/null
+++ b/lib/HammingCalculateParityTextbook.c
@@ -0,0 +1,100 @@
+/*
+Hamming Error-Correcting Code (ECC)
+Optimized for avr-gcc 4.8.1 in Atmel AVR Studio 6.2
+August 12, 2014
+
+You should include Hamming.c, Hamming.h, and only one of the other Hamming files in your project.
+The other Hamming files implement the same methods in different ways, that may be better or worse for your needs.
+
+This was created for LoFi in the TheHackadayPrize contest.
+http://hackaday.io/project/1552-LoFi
+
+Copyright 2014 David Cook
+RobotRoom.com
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "Hamming.h"
+
+// This performs poorly on a processor that can't do multiple shifts in one instruction
+#define BitToBool(byte, n) ((byte>>(n-1)) & 1)
+
+// This is a private method that calculates half the parity
+// while shifting over any previously calculated parity for another byte.
+// This was designed for processors that cannot shift more than one bit place at a time
+nibble HammingCalculateParity2416Half(byte value, byte paritySoFar)
+{
+	// Calculate the most significant bit
+	paritySoFar |= BitToBool(value, 5) ^ BitToBool(value, 6) ^ BitToBool(value, 7) ^ BitToBool(value, 8);
+	// Shift it over
+	paritySoFar <<= 1;
+
+	// Calculate the next most significant bit
+	paritySoFar |= BitToBool(value, 2) ^ BitToBool(value, 3) ^ BitToBool(value, 4) ^ BitToBool(value, 8);
+	// Shift it over, as well as the previously calculated bit
+	paritySoFar <<= 1;
+
+	// Calculate the next most significant bit
+	paritySoFar |= BitToBool(value, 1) ^ BitToBool(value, 3) ^ BitToBool(value, 4) ^ BitToBool(value, 6) ^ BitToBool(value, 7);
+	// Shift it over, as well as the previously calculated bits
+	paritySoFar <<= 1;
+
+	// Calculate the least significant bit
+	paritySoFar |= BitToBool(value, 1) ^ BitToBool(value, 2) ^ BitToBool(value, 4) ^ BitToBool(value, 5) ^ BitToBool(value, 7);
+
+	return paritySoFar;
+}
+
+// Given a byte to transmit, this returns the parity as a nibble
+nibble HammingCalculateParity128(byte value)
+{
+	return HammingCalculateParity2416Half(value, 0);
+}
+
+// If your processor can shift multiple bit places in a single instruction, then set this to 1.
+// It will be twice as fast.
+// If your processor cannot, then set this to 0, otherwise it will be slow and large.
+#define CPU_HAS_MULTIPLE_SHIFT_INSTRUCTION 0
+
+#if CPU_HAS_MULTIPLE_SHIFT_INSTRUCTION
+// Given two bytes to transmit, this returns the parity
+// as a byte with the lower nibble being for the first byte,
+// and the upper nibble being for the second byte.
+byte HammingCalculateParity2416(byte first, byte second)
+{
+	// This is the textbook way to calculate hamming parity.
+	return	((BitToBool(first, 1) ^ BitToBool(first, 2) ^ BitToBool(first, 4) ^ BitToBool(first, 5) ^ BitToBool(first, 7))) +
+			((BitToBool(first, 1) ^ BitToBool(first, 3) ^ BitToBool(first, 4) ^ BitToBool(first, 6) ^ BitToBool(first, 7))<<1) +
+			((BitToBool(first, 2) ^ BitToBool(first, 3) ^ BitToBool(first, 4) ^ BitToBool(first, 8))<<2) +
+			((BitToBool(first, 5) ^ BitToBool(first, 6) ^ BitToBool(first, 7) ^ BitToBool(first, 8))<<3) +
+
+			((BitToBool(second, 1) ^ BitToBool(second, 2) ^ BitToBool(second, 4) ^ BitToBool(second, 5) ^ BitToBool(second, 7))<<4) +
+			((BitToBool(second, 1) ^ BitToBool(second, 3) ^ BitToBool(second, 4) ^ BitToBool(second, 6) ^ BitToBool(second, 7))<<5) +
+			((BitToBool(second, 2) ^ BitToBool(second, 3) ^ BitToBool(second, 4) ^ BitToBool(second, 8))<<6) +
+			((BitToBool(second, 5) ^ BitToBool(second, 6) ^ BitToBool(second, 7) ^ BitToBool(second, 8))<<7);
+}
+#else
+// Given two bytes to transmit, this returns the parity
+// as a byte with the lower nibble being for the first byte,
+// and the upper nibble being for the second byte.
+byte HammingCalculateParity2416(byte first, byte second)
+{
+	// This makes two calls, one for each byte.
+	// It passes the result of the second byte into the calculation for the first
+	// such that the four shift instructions and the 'or' instruction are free.
+	return HammingCalculateParity2416Half(first, HammingCalculateParity2416Half(second, 0) << 1);
+}
+#endif
+
+
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..ba4b47e
--- /dev/null
+++ b/main.c
@@ -0,0 +1,277 @@
+#include <avr/io.h>
+#include <avr/sleep.h>
+#include <avr/wdt.h>
+#include <avr/interrupt.h>
+#include <avr/power.h>
+#include <avr/pgmspace.h>
+#include <avr/eeprom.h>
+#include <util/delay.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include "debug.h"
+#include "analog.h"
+//#include "dht11.h"
+#include "rf24.h"
+#include "lib/Hamming.h"
+#include "crc8.h"
+#include "onewire.h"
+
+#define EE_Num 0
+
+uint8_t ADDR[5]={0xE7,0xE7,0xE7,0xE7,0xE7}; //{0xE7,0xE7,0xE7,0xE7,0xE7}; //
+
+
+#define PKTLEN 24
+
+#define CMD_DATA 0x20
+#define CMD_BIN 0x30
+
+#ifdef DEBUG
+char debugbuf[32];
+uint16_t totaltime;
+#endif
+
+char buffer[18];
+char* text = buffer +4;
+uint8_t sendbuffer[24];
+uint8_t id;
+uint8_t pid=0;
+
+volatile bool wdt_flag=false;
+volatile bool pcint_flag=false;
+
+ISR(WATCHDOG_vect){
+	wdt_flag=true;
+}
+
+ISR(PCINT0_vect){
+    pcint_flag = true;
+}
+
+
+void sleep(){
+	
+#ifdef DEBUG
+	uint16_t time = TCNT1;
+	totaltime +=time;
+	//debughex(&time,2);
+#endif 
+
+
+	set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+	cli();
+	sleep_enable();
+	//sleep_bod_disable();
+	sei();
+	sleep_cpu();
+	sleep_disable();
+	
+#ifdef DEBUG
+	TCCR1A =0;
+	TCCR1C =0;
+	TCNT1 = 0;
+	TCCR1B = 2;
+#endif 
+}
+
+
+void wait_for_next(){
+    int cnt=6;
+ #ifdef DEBUG
+	cnt=2;
+ #endif
+    while (cnt--){
+        wdt_enable(WDTO_8S);
+        WDTCSR |= _BV(WDIE);
+        sleep();
+    }
+    cnt = rand()%6;
+    while (cnt--){
+        wdt_enable(WDTO_1S);
+        WDTCSR |= _BV(WDIE);
+        sleep();
+    }
+ #ifdef DEBUG
+	debughex(&totaltime,2);
+	totaltime=0;
+	debug("\r");
+ #endif
+    
+}
+
+void power_down(){
+    stopADC();
+    power_all_disable();
+}
+
+void wait_for_radio(){
+
+    wdt_enable(WDTO_120MS);
+    wdt_flag=false;
+    pcint_flag = false;
+
+	cli();
+	// Sleep until radio ready or wdt 60ms
+	while (bit_is_set(PINA,PA7) || (!wdt_flag) ){
+        WDTCSR |= _BV(WDIE);
+        sleep();
+        cli();   // disable interrupts before testing wdt_flag
+    }
+
+	// disable radio -> low power until next tx
+	rf24_powerDown();
+
+	if(!wdt_flag) // radio ok... wait until 60ms
+	{
+        WDTCSR |= _BV(WDIE); // reenable wdt interrupt
+		sleep();
+	}
+
+    return;
+}
+
+void setupRadio(){
+    // Static values in ram.
+	rf24_CONFIG = 0;
+    rf24_RF_CH = 90;
+	rf24_RF_SETUP = 0x26;
+	rf24_FEATURE = 0;//_BV(EN_DPL)|_BV(EN_ACK_PAY)|_BV(EN_DYN_ACK);
+	rf24_DYNPD = 0x00;
+	rf24_RX_PW[0]=PKTLEN;
+	rf24_RX_PW[1]=PKTLEN;
+	rf24_SETUP_RETR = 0x00;
+	rf24_EN_AA = 0x00;
+}
+
+void initRadio(){
+	power_usi_enable();
+	rf24_init();
+	rf24_writeRegister(RX_ADDR_P0,(uint8_t*)ADDR,5);
+	rf24_writeRegister(TX_ADDR,(uint8_t*)ADDR,5);
+}
+
+void txData(){
+	uint8_t crc,cpt,a,b,len;
+	uint8_t *in, *out;
+
+
+	// Pkt ID
+    buffer[1] = id;
+    buffer[2] = pid++;
+
+    len = buffer[0] & 0x0F;
+
+#ifdef DEBUG
+    debughex(buffer,len);
+    debug("\r");
+#endif
+
+	// CRC Calc
+    buffer[3] = 0; // CRC =0 in crc calc;
+	crc=0; cpt= len; in=(uint8_t*)buffer;
+    while(cpt--) crc = _crc8_ccitt_update(crc,*(in++));
+    buffer[3] = crc;
+
+	// Hamming compute
+    cpt= len ;
+    if(cpt & 1) buffer[cpt++]=0; // odd number => add one 0
+    cpt/=2; in=(uint8_t*)buffer; out = sendbuffer;
+
+    while(cpt--){
+        a = *(out++)= *(in++);
+        b = *(out++)= *(in++);
+        *(out++) = HammingCalculateParity2416(a,b);
+    }
+
+    cpt=4;
+    while (cpt--){
+        rf24_send(sendbuffer,PKTLEN);
+        wait_for_radio();
+    }
+}
+
+
+
+
+int main(void)
+{
+#ifdef DEBUG
+	DDRB |= _BV(PB0);
+    debug("Sonde Start \r");
+#endif
+
+	uint8_t rvcc=0;
+
+	int vcc;
+	// Setup
+	power_down();
+    setupRadio();
+    id = eeprom_read_byte((const uint8_t*)EE_Num);
+    // random seed
+
+    initADC();
+    srand((int)readVcc() * id );
+
+
+      DDRB |= _BV(PB1)  ;
+     PORTB &= ~_BV(PB1);
+
+	while(1){
+	    
+	    
+	    if(!(rvcc--)){
+			initADC();
+
+        // Read VCC
+			vcc = readVcc();
+			stopADC();
+			rvcc=4;
+		}
+
+		// Do 8 temp reads over 4s
+       /* int i = 7;
+        long lt=readtemp();
+        while(i--){
+            power_down();
+            wdt_enable(WDTO_500MS);
+            WDTCSR |= _BV(WDIE);
+            sleep();
+            power_up();
+            initADC();
+            lt += readtemp();
+        }
+        wdt_enable(WDTO_8S);
+        float temp = calctemp(lt / 8);*/
+
+		w1_start();
+        wdt_enable(WDTO_15MS);
+        WDTCSR |= _BV(WDIE);
+        sleep();
+
+        start_meas();
+        wdt_enable(WDTO_1S);
+        WDTCSR |= _BV(WDIE);
+        sleep();
+
+        uint16_t t_i = read_meas();//=temp*100;
+		w1_stop();
+
+		// Send data
+        initRadio();
+
+		buffer[0] = 0x0A | CMD_BIN;     // 10 octets :
+		*(uint16_t*)(buffer+4) = 0x0002;				// BIN v2 = vcc+tempDS
+		*(uint16_t*)(buffer+6) = vcc;	// 2 o
+		*(uint16_t*)(buffer+8) = t_i;	// 2 o
+        txData(buffer);
+
+
+        //radio off
+        rf24_powerDown();
+        
+        power_down();
+	    wait_for_next();
+	}
+}
+
diff --git a/nRF24L01.h b/nRF24L01.h
new file mode 100644
index 0000000..2012ce6
--- /dev/null
+++ b/nRF24L01.h
@@ -0,0 +1,125 @@
+/*
+    Copyright (c) 2007 Stefan Engelke <mbox@stefanengelke.de>
+
+    Permission is hereby granted, free of charge, to any person 
+    obtaining a copy of this software and associated documentation 
+    files (the "Software"), to deal in the Software without 
+    restriction, including without limitation the rights to use, copy, 
+    modify, merge, publish, distribute, sublicense, and/or sell copies 
+    of the Software, and to permit persons to whom the Software is 
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be 
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
+    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
+    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+    DEALINGS IN THE SOFTWARE.
+*/
+
+/* Memory Map */
+#define CONFIG      0x00
+#define EN_AA       0x01
+#define EN_RXADDR   0x02
+#define SETUP_AW    0x03
+#define SETUP_RETR  0x04
+#define RF_CH       0x05
+#define RF_SETUP    0x06
+#define STATUS      0x07
+#define OBSERVE_TX  0x08
+#define CD          0x09
+#define RX_ADDR_P0  0x0A
+#define RX_ADDR_P1  0x0B
+#define RX_ADDR_P2  0x0C
+#define RX_ADDR_P3  0x0D
+#define RX_ADDR_P4  0x0E
+#define RX_ADDR_P5  0x0F
+#define TX_ADDR     0x10
+#define RX_PW_P0    0x11
+#define RX_PW_P1    0x12
+#define RX_PW_P2    0x13
+#define RX_PW_P3    0x14
+#define RX_PW_P4    0x15
+#define RX_PW_P5    0x16
+#define FIFO_STATUS 0x17
+#define DYNPD	    0x1C
+#define FEATURE	    0x1D
+
+/* Bit Mnemonics */
+#define MASK_RX_DR  6
+#define MASK_TX_DS  5
+#define MASK_MAX_RT 4
+#define EN_CRC      3
+#define CRCO        2
+#define PWR_UP      1
+#define PRIM_RX     0
+#define ENAA_P5     5
+#define ENAA_P4     4
+#define ENAA_P3     3
+#define ENAA_P2     2
+#define ENAA_P1     1
+#define ENAA_P0     0
+#define ERX_P5      5
+#define ERX_P4      4
+#define ERX_P3      3
+#define ERX_P2      2
+#define ERX_P1      1
+#define ERX_P0      0
+#define AW          0
+#define ARD         4
+#define ARC         0
+#define PLL_LOCK    4
+#define RF_DR       3
+#define RF_PWR      6
+#define RX_DR       6
+#define TX_DS       5
+#define MAX_RT      4
+#define RX_P_NO     1
+#define TX_FULL     0
+#define PLOS_CNT    4
+#define ARC_CNT     0
+#define TX_REUSE    6
+#define FIFO_FULL   5
+#define TX_EMPTY    4
+#define RX_FULL     1
+#define RX_EMPTY    0
+#define DPL_P5	    5
+#define DPL_P4	    4
+#define DPL_P3	    3
+#define DPL_P2	    2
+#define DPL_P1	    1
+#define DPL_P0	    0
+#define EN_DPL	    2
+#define EN_ACK_PAY  1
+#define EN_DYN_ACK  0
+
+/* Instruction Mnemonics */
+#define R_REGISTER    0x00
+#define W_REGISTER    0x20
+#define REGISTER_MASK 0x1F
+#define ACTIVATE      0x50
+#define R_RX_PL_WID   0x60
+#define R_RX_PAYLOAD  0x61
+#define W_TX_PAYLOAD  0xA0
+#define W_ACK_PAYLOAD 0xA8
+#define FLUSH_TX      0xE1
+#define FLUSH_RX      0xE2
+#define REUSE_TX_PL   0xE3
+#define NOP           0xFF
+
+/* Non-P omissions */
+#define LNA_HCURR   0
+
+/* P model memory Map */
+#define RPD         0x09
+
+/* P model bit Mnemonics */
+#define RF_DR_LOW   5
+#define RF_DR_HIGH  3
+#define RF_PWR_LOW  1
+#define RF_PWR_HIGH 2
diff --git a/onewire.c b/onewire.c
new file mode 100644
index 0000000..74d81bc
--- /dev/null
+++ b/onewire.c
@@ -0,0 +1,231 @@
+/* 
+Access Dallas 1-Wire Devices with ATMEL AVRs
+Author of the initial code: Peter Dannegger (danni(at)specs.de)
+modified by Martin Thomas (mthomas(at)rhrk.uni-kl.de)
+ 9/2004 - use of delay.h, optional bus configuration at runtime
+10/2009 - additional delay in ow_bit_io for recovery
+ 5/2010 - timing modifcations, additonal config-values and comments,
+          use of atomic.h macros, internal pull-up support
+ 7/2010 - added method to skip recovery time after last bit transfered
+          via ow_command_skip_last_recovery
+*/
+
+#include <inttypes.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
+#include "onewire.h"
+
+#define NULL 0
+
+
+inline void OUT_LOW(void){
+  W1_DDR |= _BV(W1_PIN); // OUT
+  W1_OUT &= ~(_BV(W1_PIN)); // LOW
+}
+
+inline void OUT_HIGH(void){
+  W1_DDR |= _BV(W1_PIN); // OUT
+  W1_OUT |= _BV(W1_PIN); // HIGH
+}
+
+inline void PULL_UP(void){
+  W1_DDR &= ~(_BV(W1_PIN));
+  W1_OUT |= _BV(W1_PIN); // pull up
+}
+
+
+uint8_t w1_reset(void)
+{
+  uint8_t err;
+
+  OUT_LOW();
+  
+  _delay_us(480);
+
+  cli();
+	
+  PULL_UP();
+
+  _delay_us(66);
+
+  err = bit_is_set(W1_IN,W1_PIN);			// no presence detect
+
+  sei();
+
+  _delay_us(414); // 480 - 66
+
+  if( bit_is_clear(W1_IN,W1_PIN))		// short circuit
+    err = 1;
+
+  OUT_HIGH();
+
+  return err;
+}
+
+
+uint8_t w1_bit_io(uint8_t b)
+{
+  cli();
+  OUT_LOW();
+  
+  _delay_us(1);
+  if( b ){
+	  PULL_UP();
+  }
+  _delay_us(14); // 15 - 1
+  if( bit_is_clear(W1_IN,W1_PIN))
+    b = 0;
+    
+  _delay_us(45); // 60 - 15
+  
+  OUT_HIGH();
+  sei();
+  return b;
+}
+
+
+uint8_t w1_byte_wr(uint8_t b)
+{
+  uint8_t i = 8, j;
+  do{
+    j = w1_bit_io( b & 1 );
+    b >>= 1;
+    if( j )
+      b |= 0x80;
+  }while( --i );
+  return b;
+}
+
+
+uint8_t w1_byte_rd(void)
+{
+  return w1_byte_wr( 0xFF );
+}
+
+
+uint8_t w1_rom_search(uint8_t diff, uint8_t* id)
+{
+  uint8_t i, j, next_diff;
+  uint8_t b;
+
+  if( w1_reset() )
+    return PRESENCE_ERR;			// error, no device found
+  w1_byte_wr( SEARCH_ROM );			// ROM search command
+  next_diff = LAST_DEVICE;			// unchanged on last device
+  i = 8 * 8;					// 8 bytes
+  do{
+    j = 8;					// 8 bits
+    do{
+      b = w1_bit_io( 1 );			// read bit
+      if( w1_bit_io( 1 ) ){			// read complement bit
+	if( b )					// 11
+	  return DATA_ERR;			// data error
+      }else{
+	if( !b ){				// 00 = 2 devices
+	  if( diff > i ||
+	    ((*id & 1) && diff != i) ){
+	    b = 1;				// now 1
+	    next_diff = i;			// next pass 0
+	  }
+	}
+      }
+      w1_bit_io( b );     			// write bit
+      *id >>= 1;
+      if( b )					// store bit
+	*id |= 0x80;
+      i--;
+    }while( --j );
+    id++;					// next byte
+  }while( i );
+  return next_diff;				// to continue search
+}
+
+
+void w1_stop()
+{
+	//W1_DDR |= 1<<W1_PIN; // Output
+	  W1_OUT &= ~(_BV(W1_PIN));
+	  W1_DDR &= ~(_BV(W1_PIN));
+}
+void w1_start()
+{
+ OUT_HIGH();
+}
+
+void w1_command(uint8_t command, uint8_t* id)
+{
+  uint8_t i;
+  w1_reset();
+  if( id ){
+    w1_byte_wr( MATCH_ROM );			// to a single device
+    i = 8;
+    do{
+      w1_byte_wr( *id );
+      id++;
+    }while( --i );
+  }else{
+    w1_byte_wr( SKIP_ROM );			// to all devices
+  }
+  w1_byte_wr( command );
+}
+
+
+void start_meas(void)
+{
+  if (bit_is_set(W1_IN,W1_PIN)) {
+    w1_command( CONVERT_T, NULL );
+    OUT_HIGH();
+  }
+}
+
+
+uint16_t read_meas(void)
+{
+ /* uint8_t id[8], diff;
+  //uint8_t s[30];
+  uint8_t i;*/
+  uint16_t temp = 0;
+
+  /*for( diff = SEARCH_FIRST; diff != LAST_DEVICE; ){
+    diff = w1_rom_search( diff, id );
+
+    if( diff == PRESENCE_ERR ){
+      //uputsnl( "No Sensor found" );
+      return -1;
+    }
+    if( diff == DATA_ERR ){
+      //uputsnl( "Bus Error" );
+      return -2;
+    }
+    if( id[0] == 0x28 || id[0] == 0x10 ){	// temperature sensor
+      //uputs( "ID: " );
+      for( i = 0; i < 8; i++ ){
+	//sprintf( s, "%02X ", id[i] );
+	//uputs( s );
+      }
+      w1_byte_wr( READ );			// read command
+      temp = w1_byte_rd();			// low byte
+      temp |= (uint16_t)w1_byte_rd() << 8;		// high byte
+      if( id[0] == 0x10 )			// 9 -> 12 bit
+        temp <<= 3;
+      //sprintf( s, "  T: %04X = ", temp );	// hex value
+      //uputs( s );
+      //sprintf( s, "%4d.%01d¯C", temp >> 4, (temp << 12) / 6553 ); // 0.1¯C
+      //uputsnl( s );
+    }
+  }*/
+  //uputsnl( "" );
+  
+  if(w1_reset()) return -1;
+  //w1_command(SKIP_ROM,NULL);
+  w1_byte_wr( SKIP_ROM );
+  w1_byte_wr( READ );
+  temp = w1_byte_rd();
+  temp |= (uint16_t)w1_byte_rd() << 8;
+ // temp <<= 3;
+  
+  return temp ;//(temp >> 4) * 100 + ((temp << 12) / 6553) * 10;
+  //return temp >> 4;
+}
diff --git a/onewire.h b/onewire.h
new file mode 100644
index 0000000..5b497fe
--- /dev/null
+++ b/onewire.h
@@ -0,0 +1,57 @@
+/* 
+Access Dallas 1-Wire Devices with ATMEL AVRs
+Author of the initial code: Peter Dannegger (danni(at)specs.de)
+modified by Martin Thomas (mthomas(at)rhrk.uni-kl.de)
+ 9/2004 - use of delay.h, optional bus configuration at runtime
+10/2009 - additional delay in ow_bit_io for recovery
+ 5/2010 - timing modifcations, additonal config-values and comments,
+          use of atomic.h macros, internal pull-up support
+ 7/2010 - added method to skip recovery time after last bit transfered
+          via ow_command_skip_last_recovery
+*/
+
+#ifndef ONEWIRE_H__
+#define ONEWIRE_H__
+
+#define W1_PIN	PA0
+#define W1_IN	PINA
+#define W1_OUT	PORTA
+#define W1_DDR	DDRA
+
+#define MATCH_ROM	0x55
+#define SKIP_ROM	0xCC
+#define	SEARCH_ROM	0xF0
+
+#define CONVERT_T	0x44		// DS1820 commands
+#define READ		0xBE
+#define WRITE		0x4E
+#define EE_WRITE	0x48
+#define EE_RECALL	0xB8
+
+#define	SEARCH_FIRST	0xFF		// start new search
+#define	PRESENCE_ERR	0xFF
+#define	DATA_ERR	0xFE
+#define LAST_DEVICE	0x00		// last device found
+//			0x01 ... 0x40: continue searching
+
+uint8_t w1_reset(void);
+
+uint8_t w1_byte_wr(uint8_t b);
+uint8_t w1_byte_rd(void);
+
+uint8_t w1_rom_search(uint8_t diff, uint8_t* id);
+
+void w1_stop();
+void w1_start();
+
+
+void w1_command(uint8_t command, uint8_t* id);
+
+
+// temperature
+void start_meas(void);
+uint16_t read_meas(void);
+
+
+
+#endif // ONEWIRE_H__
diff --git a/rf24.c b/rf24.c
new file mode 100644
index 0000000..69f4150
--- /dev/null
+++ b/rf24.c
@@ -0,0 +1,270 @@
+
+#include "rf24.h"
+#include <util/delay.h>
+
+
+uint8_t PTX=0;
+uint8_t rf24_CONFIG = _BV(EN_CRC) | _BV(CRCO);
+uint8_t rf24_EN_AA = 0x3F; //ENAA_P0 - ENAA_P5
+uint8_t rf24_EN_RXADDR = _BV(ERX_P0)|_BV(ERX_P1);
+uint8_t rf24_SETUP_AW = 0x03; // 5 bytes addresses
+uint8_t rf24_SETUP_RETR = 0x03;
+uint8_t rf24_RF_CH = 0x02; // Channel
+uint8_t rf24_RF_SETUP = _BV(RF_DR_HIGH) | _BV(RF_PWR_LOW) | _BV(RF_PWR_HIGH);
+uint8_t rf24_FEATURE = 0;
+uint8_t rf24_DYNPD= 0;
+uint8_t rf24_RX_PW[6] = { 32,32,0,0,0,0 };
+
+
+
+void inline rf24_ceHi(){
+    //CE_PIN_PORT |= _BV(CE_PIN_BIT);
+}
+
+void inline rf24_ceLow(){
+    //CE_PIN_PORT &= ~_BV(CE_PIN_BIT);
+}
+
+void inline rf24_csnHi(){
+    CSN_PIN_PORT |= _BV(CSN_PIN_BIT);
+}
+
+void inline rf24_csnLow(){
+    CSN_PIN_PORT &= ~_BV(CSN_PIN_BIT);
+}
+
+void rf24_init()
+{
+    //CE_PIN_DDR |= _BV(CE_PIN_BIT);
+    CSN_PIN_DDR |= _BV(CSN_PIN_BIT);
+
+    rf24_ceLow();
+    rf24_csnHi();
+
+    // Initialize spi module
+    spi_begin();
+    _delay_ms(2);
+    rf24_configure();
+
+}
+
+
+void inline rf24_transferSync(uint8_t *dataout,uint8_t *datain,uint8_t len){
+	uint8_t i;
+	for(i = 0;i < len;i++){
+		datain[i] = spi_transfer(dataout[i]);
+	}
+}
+
+void inline rf24_transmitSync(uint8_t *dataout,uint8_t len){
+	uint8_t i;
+	for(i = 0;i < len;i++){
+		spi_transfer(dataout[i]);
+	}
+}
+
+void inline rf24_configRegister(uint8_t reg, uint8_t value)
+// Clocks only one byte into the given MiRF register
+{
+    rf24_csnLow();
+    spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
+    spi_transfer(value);
+    rf24_csnHi();
+}
+
+void inline rf24_readRegister(uint8_t reg, uint8_t * value, uint8_t len)
+// Reads an array of bytes from the given start position in the MiRF registers.
+{
+    rf24_csnLow();
+    spi_transfer(R_REGISTER | (REGISTER_MASK & reg));
+    rf24_transferSync(value,value,len);
+    rf24_csnHi();
+}
+
+
+
+void inline rf24_writeRegister(uint8_t reg, uint8_t * value, uint8_t len)
+// Writes an array of bytes into inte the MiRF registers.
+{
+    rf24_csnLow();
+    spi_transfer(W_REGISTER | (REGISTER_MASK & reg));
+    rf24_transmitSync(value,len);
+    rf24_csnHi();
+}
+
+void rf24_getData(uint8_t * data,uint8_t len)
+{
+    rf24_csnLow();                               // Pull down chip select
+    spi_transfer( R_RX_PAYLOAD );            // Send cmd to read rx payload
+    rf24_transferSync(data,data,len); // Read payload
+    rf24_csnHi();                               // Pull up chip select
+    // NVI: per product spec, p 67, note c:
+    //  "The RX_DR IRQ is asserted by a new packet arrival event. The procedure
+    //  for handling this interrupt should be: 1) read payload through SPI,
+    //  2) clear RX_DR IRQ, 3) read FIFO_STATUS to check if there are more
+    //  payloads available in RX FIFO, 4) if there are more data in RX FIFO,
+    //  repeat from step 1)."
+    // So if we're going to clear RX_DR here, we need to check the RX FIFO
+    // in the dataReady() function
+    rf24_configRegister(STATUS,(1<<RX_DR));   // Reset status register
+
+}
+
+uint8_t rf24_getDataDL(uint8_t * data,uint8_t len)
+// Reads payload bytes into data array
+{
+
+    uint8_t to_read;
+
+    rf24_csnLow();                               // Pull down chip select
+    spi_transfer( R_RX_PL_WID );            // Send cmd to read rx payload len
+    to_read = spi_transfer(0); // Read payload
+    rf24_csnHi();                               // Pull up chip select
+
+    if(len>to_read && to_read>0 ) len=to_read;
+
+    rf24_csnLow();                               // Pull down chip select
+    spi_transfer( R_RX_PAYLOAD );            // Send cmd to read rx payload
+    rf24_transferSync(data,data,len); // Read payload
+
+    if(to_read!=len){
+        to_read-=len;
+	while((to_read--)>0)	// read remaining
+	    spi_transfer(0);
+    }
+    rf24_csnHi();                               // Pull up chip select
+    // NVI: per product spec, p 67, note c:
+    //  "The RX_DR IRQ is asserted by a new packet arrival event. The procedure
+    //  for handling this interrupt should be: 1) read payload through SPI,
+    //  2) clear RX_DR IRQ, 3) read FIFO_STATUS to check if there are more
+    //  payloads available in RX FIFO, 4) if there are more data in RX FIFO,
+    //  repeat from step 1)."
+    // So if we're going to clear RX_DR here, we need to check the RX FIFO
+    // in the dataReady() function
+    rf24_configRegister(STATUS,(1<<RX_DR));   // Reset status register
+    return to_read;
+}
+
+uint8_t inline rf24_dataReady()
+// Checks if data is available for reading
+{
+    // See note in getData() function - just checking RX_DR isn't good enough
+	uint8_t status = rf24_getStatus();
+
+    // We can short circuit on RX_DR, but if it's not set, we still need
+    // to check the FIFO for any pending packets
+    if ( status & (1 << RX_DR) ) return 1;
+    return !rf24_rxFifoEmpty();
+}
+
+uint8_t inline rf24_rxFifoEmpty(){
+	uint8_t fifoStatus;
+
+	rf24_readRegister(FIFO_STATUS,&fifoStatus,sizeof(fifoStatus));
+	return (fifoStatus & (1 << RX_EMPTY));
+}
+
+
+void rf24_send(uint8_t * value,uint8_t len)
+// Sends a data package to the default address. Be sure to send the correct
+// amount of bytes as configured as payload on the receiver.
+{
+    uint8_t status;
+    status = rf24_getStatus();
+
+    if((status & ((1 << TX_DS)  | (1 << MAX_RT)))){
+	rf24_configRegister(STATUS,(1 << TX_DS) | (1 << MAX_RT));
+    }
+
+    rf24_ceLow();
+
+    rf24_powerUpTx();       // Set to transmitter mode , Power up
+
+    rf24_csnLow();                    // Pull down chip select
+    spi_transfer( FLUSH_TX );     // Write cmd to flush tx fifo
+    rf24_csnHi();                    // Pull up chip select
+
+    rf24_csnLow();                    // Pull down chip select
+    spi_transfer( W_TX_PAYLOAD ); // Write cmd to write payload
+    rf24_transmitSync(value,len);   // Write payload
+    rf24_csnHi();                    // Pull up chip select
+
+    rf24_ceHi();                     // Start transmission
+}
+
+uint8_t inline rf24_isSending(){
+	uint8_t status;
+	if(PTX){
+		status = rf24_getStatus();
+
+		/*
+		 *  if sending successful (TX_DS) or max retries exceded (MAX_RT).
+		 */
+
+		if((status & ((1 << TX_DS)  | (1 << MAX_RT)))){
+			return 0;
+		}
+
+		return 1;
+	}
+	return 0;
+}
+
+uint8_t inline rf24_getStatus(){
+    uint8_t rv;
+    rf24_csnLow();
+    rv=spi_transfer(NOP);
+    rf24_csnHi();
+	return rv;
+}
+
+void inline rf24_powerUpRx(){
+	PTX = 0;
+	rf24_ceLow();
+	rf24_configRegister(CONFIG, rf24_CONFIG | ( (1<<PWR_UP) | (1<<PRIM_RX) ) );
+	rf24_ceHi();
+	rf24_configRegister(STATUS,(1 << TX_DS) | (1 << MAX_RT));
+}
+
+
+void inline rf24_flushRx(){
+    rf24_csnLow();
+    spi_transfer( FLUSH_RX );
+    rf24_csnHi();
+}
+
+void inline rf24_powerUpTx(){
+	PTX = 1;
+	rf24_configRegister(CONFIG, rf24_CONFIG | ( (1<<PWR_UP) | (0<<PRIM_RX) ) );
+}
+
+void inline rf24_powerDown(){
+	rf24_ceLow();
+	rf24_configRegister(CONFIG, rf24_CONFIG );
+}
+
+void rf24_configure(){
+	uint8_t data;
+	rf24_configRegister(CONFIG,rf24_CONFIG);
+	rf24_configRegister(FEATURE,rf24_FEATURE);
+	// Check Feature register ...
+	rf24_readRegister(FEATURE,&data,1);
+	if(rf24_FEATURE != data){  // ACTIVATE & retry
+	    rf24_csnLow();
+	    spi_transfer(ACTIVATE);
+	    spi_transfer(0x73);
+	    rf24_csnHi();
+	    rf24_configRegister(FEATURE,rf24_FEATURE);
+	}
+	rf24_configRegister(EN_AA,rf24_EN_AA);
+	rf24_configRegister(EN_RXADDR,rf24_EN_RXADDR);
+	rf24_configRegister(SETUP_AW,rf24_SETUP_AW);
+	rf24_configRegister(SETUP_RETR,rf24_SETUP_RETR);
+	rf24_configRegister(RF_CH,rf24_RF_CH);
+	rf24_configRegister(RF_SETUP,rf24_RF_SETUP);
+	rf24_configRegister(DYNPD,rf24_DYNPD);
+
+	for(int i=0; i<6;i++)
+		rf24_configRegister(RX_PW_P0+i,rf24_RX_PW[i]);
+
+}
diff --git a/rf24.h b/rf24.h
new file mode 100644
index 0000000..cdcc5e0
--- /dev/null
+++ b/rf24.h
@@ -0,0 +1,72 @@
+#include "nRF24L01.h"
+#include "spi.h"
+#include <avr/io.h>
+#include "defines.h"
+
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+
+void rf24_init();
+
+void rf24_configRegister(uint8_t reg, uint8_t value);
+void rf24_readRegister(uint8_t reg, uint8_t * value, uint8_t len);
+void rf24_writeRegister(uint8_t reg, uint8_t * value, uint8_t len);
+
+void rf24_getData(uint8_t * data,uint8_t len);
+uint8_t rf24_getDataDL(uint8_t * data,uint8_t len);
+uint8_t rf24_dataReady();
+uint8_t rf24_rxFifoEmpty();
+
+
+void rf24_send(uint8_t * value,uint8_t len);
+uint8_t rf24_isSending();
+uint8_t rf24_getStatus();
+
+void rf24_powerUpRx();
+void rf24_powerUpTx();
+void rf24_powerDown();
+void rf24_flushRx();
+void rf24_configure();
+
+
+extern uint8_t rf24_CONFIG;
+extern uint8_t rf24_EN_AA;
+extern uint8_t rf24_EN_RXADDR;
+extern uint8_t rf24_SETUP_AW;
+extern uint8_t rf24_SETUP_RETR;
+extern uint8_t rf24_RF_CH;
+extern uint8_t rf24_RF_SETUP;
+extern uint8_t rf24_FEATURE;
+extern uint8_t rf24_DYNPD;
+extern uint8_t rf24_RX_PW[6];
+
+#if defined (__AVR_ATtiny84__) || defined (__AVR_ATtiny84A__)
+
+#define CE_PIN_PORT UNDEF
+#define CE_PIN_DDR UNDEF
+#define CE_PIN_BIT UNDEF
+
+#define CSN_PIN_PORT PORTB
+#define CSN_PIN_DDR DDRB
+#define CSN_PIN_BIT PB2
+
+#elif defined(__AVR_ATmega32U4__)
+
+#define CE_PIN_PORT PORTD
+#define CE_PIN_DDR DDRD
+#define CE_PIN_BIT PD4
+
+#define CSN_PIN_PORT PORTC
+#define CSN_PIN_DDR DDRC
+#define CSN_PIN_BIT PC6
+
+#endif
+
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
diff --git a/spi.c b/spi.c
new file mode 100644
index 0000000..cb4a1b8
--- /dev/null
+++ b/spi.c
@@ -0,0 +1,79 @@
+#include "spi.h"
+#include <util/delay.h>
+
+
+void spi_begin() {
+#if defined(SPCR)
+#error to write ...
+	// Set SS to high so a connected chip will be "deselected" by default
+	digitalWrite(SS, HIGH);
+	// When the SS pin is set as OUTPUT, it can be used as
+	// a general purpose output port (it doesn't influence
+	// SPI operations).
+	pinMode(SS, OUTPUT);
+	// Warning: if the SS pin ever becomes a LOW INPUT then SPI
+	// automatically switches to Slave, so the data direction of
+	// the SS pin MUST be kept as OUTPUT.
+	SPCR |= _BV(MSTR);
+	SPCR |= _BV(SPE);
+	// Set direction register for SCK and MOSI pin.
+	// MISO pin automatically overrides to INPUT.
+	// By doing this AFTER enabling SPI, we avoid accidentally
+	// clocking in a single bit since the lines go directly
+	// from "input" to SPI control.
+	// http://code.google.com/p/arduino/issues/detail?id=888
+	pinMode(SCK, OUTPUT);
+	pinMode(MOSI, OUTPUT);
+#else
+    PRR &= ~(_BV(PRUSI));
+	USICR = _BV(USIWM0);
+	USCK_DDR |= _BV(USCK_BIT); //set the USCK pin as output
+	DO_DDR |= _BV(DO_BIT); //set the DO pin as output
+	DI_DDR &= ~_BV(DI_BIT); //set the DI pin as input
+#endif
+}
+
+uint8_t spi_transfer(uint8_t b) {
+#if defined(SPCR)
+	SPDR = b;
+	while (!(SPSR & _BV(SPIF)));
+	return SPDR;
+#else
+	USIDR = b;
+	USISR = _BV(USIOIF);
+	do {
+		USICR = _BV(USIWM0) | _BV(USICS1) | _BV(USICLK) | _BV(USITC);
+//		_delay_ms(1);
+	}while ((USISR & _BV(USIOIF)) == 0);
+	return USIDR;
+#endif
+}
+
+void spi_end() {
+#if defined(SPCR)
+	SPCR &= ~_BV(SPE);
+#else
+	USICR &= ~(_BV(USIWM1) | _BV(USIWM0));
+#endif
+}
+
+void spi_setBitOrder(uint8_t bitOrder)
+{
+#if defined(SPCR)
+	if(bitOrder == LSBFIRST) {
+		SPCR |= _BV(DORD);
+	} else {
+		SPCR &= ~(_BV(DORD));
+	}
+#endif
+}
+
+void spi_setDataMode(uint8_t mode)
+{
+#if defined(SPCR)
+	SPCR = (SPCR & ~SPI_MODE_MASK) | mode;
+#else
+
+#endif
+}
+
diff --git a/spi.h b/spi.h
new file mode 100644
index 0000000..eabdb91
--- /dev/null
+++ b/spi.h
@@ -0,0 +1,29 @@
+#ifndef tinySPI_h
+#define tinySPI_h
+
+#include <stdint.h>
+#include <avr/io.h>
+#include <util/atomic.h>
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+
+//SPI data modes
+#define SPI_MODE0 0x00
+#define SPI_MODE1 0x04
+
+void spi_begin(void);
+void spi_setDataMode(uint8_t spiDataMode);
+uint8_t spi_transfer(uint8_t spiData);
+void spi_end(void);
+
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif
+
+
diff --git a/uart.S b/uart.S
new file mode 100644
index 0000000..c8e59ee
--- /dev/null
+++ b/uart.S
@@ -0,0 +1,76 @@
+//UART Functions per AVR Application Note #305
+#include <avr/io.h>
+//#include "uLogTimer.h"
+ 
+//
+//half bit delay
+//
+//#define b 31                //38400 bps@8MHz with 0.3% error
+#define b 66              //19200 bps@8MHz with 0.6% error
+UARTDelay:
+        ldi  r17, b
+UARTDelay1:
+        dec  r17
+        brne UARTDelay1
+        ret
+ 
+//
+//asynchronous 8n1 serial transmit byte
+//
+#define TX_PIN 6                //TX pin is PA6
+ 
+.global SerialPutChar
+SerialPutChar:
+        push r16
+        push r17
+        ldi  r16, 10        ;1 start + 8 data + 1 stop bits (bit count)
+        com  r24            ;Invert it (r24 = xmit byte)
+        sec             ;Start bit
+putchar0:
+        brcc putchar1       ;If carry set
+        cbi  _SFR_IO_ADDR(PORTB), PB0 ;send a '0'
+        rjmp putchar2       ;else
+putchar1:
+        sbi  _SFR_IO_ADDR(PORTB), PB0 ;send a '1'
+        nop
+putchar2:
+        rcall UARTDelay     ;1/2 bit delay +
+        rcall UARTDelay     ;1/2 bit delay = 1bit delay
+        lsr   r24           ;Get next bit
+        dec   r16           ;If not all bits sent
+        brne  putchar0      ;send next
+                        ;else
+        pop   r17
+        pop   r16
+        ret             ;return
+ 
+//
+//asynchronous 8n1 serial receive byte
+//
+#define RX_PIN 5                //RX pin is PA5
+ 
+.global SerialGetChar
+SerialGetChar:
+        push  r16
+        push  r17
+        ldi   r16, 9        ;8 data bits + 1 stop bit
+getchar1:
+        sbic  _SFR_IO_ADDR(PINB), PB1 ;Wait for start bit
+        rjmp  getchar1
+        rcall UARTDelay     ;1.5bit delay after start bit edge
+getchar2:
+        rcall UARTDelay     ;1 bit delay from here
+        rcall UARTDelay
+        clc             ;clear carry
+        sbic  _SFR_IO_ADDR(PINB), PB1 ;if RX pin high
+        sec             ;
+        dec   r16           ;If bit is stop bit
+        breq  getchar3      ;   return
+                        ;else
+        ror   r24           ;   shift bit into r24 (rec'd byte)
+        rjmp  getchar2      ;   go get next
+getchar3:
+        ldi   r25, 0x00     ;zero extend r24:r25 for return
+        pop   r17
+        pop   r16
+        ret
diff --git a/uart.h b/uart.h
new file mode 100644
index 0000000..4c42557
--- /dev/null
+++ b/uart.h
@@ -0,0 +1,4 @@
+//asynchronous 8n1 serial transmission per AVR AppNote #305
+void SerialPutChar (char);
+char SerialGetChar(void);
+