commit 48d1fc0bb060f6165a63e8077b4a7467d4564968
Author: Jochen Friedrich <jochen@scram.de>
Date:   Sun Feb 18 20:16:33 2018 +0000

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8956788
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.hex
+*.lst
+*.elf
+*.o
+*.map
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..3f872e0
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,38 @@
+PROJ = avr-eb
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+CPU = atmega88
+
+CFLAGS += -Os -g -mmcu=$(CPU) -Wall
+CFLAGS += -Wa,-adhlns=$(<:%.c=%.lst)
+
+CLDFLAGS += -mmcu=$(CPU) -Wl,-Map=$(@:%.elf=%.map)
+
+TESTOBJS += testnode.o testhbw.o
+RELAISOBJS += relaisnode.o relaishbw.o
+
+all: testnode.hex relaisnode.hex
+
+testnode.o: testnode.c hbw.h hw.h testhw.h
+	$(CC) $(CFLAGS) -DTESTNODE -c $< -o $@
+
+testhbw.o: hbw.c hbw.h hw.h testhw.h
+	$(CC) $(CFLAGS) -DTESTNODE -c $< -o $@
+
+testnode.elf: $(TESTOBJS)
+	$(CC) $(CLDFLAGS) -o $@ $(TESTOBJS)
+
+relaisnode.o: relaisnode.c hbw.h hw.h relaishw.h
+	$(CC) $(CFLAGS) -DRELAISNODE -c $< -o $@
+
+relaishbw.o: hbw.c hbw.h hw.h relaishw.h
+	$(CC) $(CFLAGS) -DRELAISNODE -c $< -o $@
+
+relaisnode.elf: $(RELAISOBJS)
+	$(CC) $(CLDFLAGS) -o $@ $(RELAISOBJS)
+
+%hex:%elf
+	$(OBJCOPY) -j .text -j .data -O srec $< $@
+
+clean:
+	rm -f *.hex *.elf *.o *.lst *.map
diff --git a/alarmhw.h b/alarmhw.h
new file mode 100644
index 0000000..05dbe66
--- /dev/null
+++ b/alarmhw.h
@@ -0,0 +1,7 @@
+#ifndef __ALARMHW_H__
+#define __ALARMHW_H__
+#define RedLED		PD4
+#define GreenLED	PD5
+#define BuzzerON	PD6
+#define ReedSwitch	PD7
+#endif
diff --git a/alarmnode.c b/alarmnode.c
new file mode 100644
index 0000000..b6f8338
--- /dev/null
+++ b/alarmnode.c
@@ -0,0 +1,130 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/eeprom.h>
+#include "alarmhw.h"
+#include "rs485.h"
+#include "eb.h"
+
+uint8_t reedstate;
+uint8_t buzzerstate;
+
+uint8_t waitforack;
+uint8_t waitforsend;
+uint8_t acktimer;
+
+int main(void)
+{
+	uint8_t i;
+
+	init_rs485();
+	DDRD |= (1<<RedLED);
+	DDRD |= (1<<GreenLED);
+	DDRD |= (1<<BuzzerON);
+	DDRD &= ~(1<<ReedSwitch);
+
+	PORTD  &= ~(1<<RedLED);
+	PORTD |= (1<<GreenLED);
+	PORTD &= ~(1<<BuzzerON);
+	PORTD |= (1<<ReedSwitch);
+
+	ADMUX  = (0<<REFS1) | (1<<REFS0);
+	ADCSRA = (1<<ADPS2) | (1<<ADPS1);
+	ADCSRA |= (1<<ADEN);
+	ADCSRA |= (1<<ADSC);
+	loop_until_bit_is_clear(ADCSRA, ADSC);
+	svalue = ADCW;
+
+	my_address = eeprom_read_byte((const uint8_t *)0);
+	my_prio    = eeprom_read_byte((const uint8_t *)1);
+	master     = eeprom_read_byte((const uint8_t *)2);
+
+	buzzerstate = 0;
+	reedstate = 0;
+
+	waitforsend = 0;
+	acktimer = 0;
+
+	sei();
+	while(1) {
+		rs485_loop();
+		if (rflag) {
+			if (rsender)
+				srecv = rsender;
+			else
+				srecv = master;
+			smode = 0;
+			if ((rrecv == my_address) && (rmode == 2)) {
+				acktimer = 0;
+				waitforsend = 0;
+			}
+
+			if ((rrecv == my_address) && (rmode == 0)) {
+				for (i=0; i<4; i++) {
+					decodepart(i);
+					scommand = 0;
+					schannel = rchannel;
+					if ((rcommand == 0x40) && (rchannel == 0)) {
+						scommand = 0x40;
+						svalue = 2; /* 2 LED keys + 4 ADCs */
+					}
+					if ((rcommand == 0x60) && (rchannel == 1)) {
+						if (rvalue & 0x02) {
+							buzzerstate = ~0;
+							PORTD |= (1<<BuzzerON);
+						} else {
+							buzzerstate = 0;
+							PORTD  &= ~(1<<BuzzerON);
+						}
+						scommand = 0x40;
+						svalue = (reedstate & 0x01) | (buzzerstate & 0x02);
+					}
+					if ((rcommand == 0x40) && (rchannel == 1)) {
+						scommand = 0x40;
+						svalue = (reedstate & 0x01) | (buzzerstate & 0x02);
+					}
+					if ((rcommand == 0x40) && ((rchannel > 1) && (rchannel < 6))) {
+						ADMUX = (ADMUX & ~(0x1F)) | (rchannel - 2);
+						ADCSRA |= (1<<ADSC);
+						loop_until_bit_is_clear(ADCSRA, ADSC);
+						scommand = 0x40;
+						svalue = ADCW;
+					}
+					encodepart(i);
+				}
+				smode = 0;
+				sendmsg();
+				acktimer = 0;
+				waitforsend = 0;
+			}
+			if ((rrecv == 0) && (rmode == 0) && waitforsend) {
+				if (!acktimer) {
+					scommand = 0x40;
+					schannel = 1;
+					svalue = (reedstate & 0x01) | (buzzerstate & 0x02);
+					encodepart(0);
+					scommand = 0;
+					encodepart(1);
+					encodepart(2);
+					encodepart(3);
+					smode = 1;
+					sendmsg();
+					acktimer = my_prio;
+				} else
+					acktimer--;
+			}
+			rflag = 0;
+		}
+		if (bit_is_clear(PIND, ReedSwitch) && (!reedstate)) {
+			reedstate = ~0;
+			waitforsend = ~0;
+			PORTD |= (1<<RedLED);
+			PORTD  &= ~(1<<GreenLED);
+		}
+		if (bit_is_set(PIND, ReedSwitch) && reedstate) {
+			reedstate = 0;
+			waitforsend = ~0;
+			PORTD  &= ~(1<<RedLED);
+			PORTD |= (1<<GreenLED);
+		}
+	}
+}
diff --git a/hbw.c b/hbw.c
new file mode 100644
index 0000000..e52fc0a
--- /dev/null
+++ b/hbw.c
@@ -0,0 +1,604 @@
+#include "hw.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/eeprom.h>
+#include <stdlib.h>
+#include <string.h>
+#include "hbw.h"
+
+uint32_t my_address;
+
+uint8_t rind;
+uint16_t rcrc;
+uint32_t raddress;
+uint32_t rdest;
+uint8_t resc;
+uint8_t rctl;
+volatile uint8_t rready;
+uint8_t rmessage[62];
+uint8_t rlen;
+
+uint8_t sind;
+uint8_t sdisc;
+uint8_t sctl;
+uint16_t scrc;
+uint8_t sesc;
+uint32_t saddress;
+uint8_t slen;
+uint8_t smessage[62];
+
+uint16_t sdelay;
+
+uint8_t waitack;
+uint32_t aaddress;
+
+uint8_t asent;
+uint8_t gotack;
+
+uint8_t configled;
+uint8_t configbutton;
+uint8_t configstate;
+uint16_t configtimer;
+
+static uint16_t crc16shift(uint16_t crc, uint8_t data)
+{
+        int stat, i;
+
+        for (i=0; i<8; i++) {
+                stat = crc & 0x8000;
+                crc = crc << 1;
+                if (data & 0x80)
+                        crc = crc | 1;
+
+                if (stat)
+                        crc = crc ^ 0x1002;
+
+                data = data << 1;
+        }
+        return crc;
+}
+
+static void readaddr(void)
+{
+//	my_address=eeprom_read_dword((const uint32_t *)EESIZE-4);
+	((uint8_t*)&my_address)[0]=eeprom_read_byte((const uint8_t *)EESIZE-4);
+	((uint8_t*)&my_address)[1]=eeprom_read_byte((const uint8_t *)EESIZE-3);
+	((uint8_t*)&my_address)[2]=eeprom_read_byte((const uint8_t *)EESIZE-2);
+	((uint8_t*)&my_address)[3]=eeprom_read_byte((const uint8_t *)EESIZE-1);
+
+	if (my_address == 0xFFFFFFFF)
+		((uint8_t*)&my_address)[0] = 0x42;
+}
+
+static void send(uint8_t i,uint8_t crc)
+{
+	if (bit_is_set(UCSR0A, UDRE0)) {
+		if (sesc) {
+			UDR0 = i & 0x7F;
+			sind++;
+			sesc = 0;
+			return;
+		}
+		if (crc == 1) {
+			scrc = crc16shift(scrc, i);
+		}
+		if (crc == 2) {
+			scrc = crc16shift(scrc, 0);
+			scrc = crc16shift(scrc, 0);
+			i = (scrc >> 8) & 0xFF;
+		}
+		if ((i == 0xFD) || (i == 0xFC) || (i == 0xFE)) {
+			UDR0 = 0xFC;
+			sesc = 1;
+			return;
+		}
+		UDR0 = i;
+		sind++;
+	}
+}
+
+void rloop(void)
+{
+	if (!sind)
+		return;
+
+	if (sdisc) {
+		if (sind == 1) {
+			send(0x04,1);
+			return;
+		}
+		if (sind == 2) {
+			send(0x01,1);
+			return;
+		}
+		if (sind == 3) {
+			send((scrc >> 8) & 0xFF,2);
+			return;
+		}
+		if (sind == 4) {
+			send(scrc & 0xFF,0);
+			return;
+		}
+		if (bit_is_set(UCSR0A, TXC0)) {
+			PORTD  &= ~(1<<SenderEnable);
+			PORTD  &= ~(1<<ReceiverDisable);
+			sind = 0;
+			sdisc = 0;
+		}
+		return;
+	}
+
+	if (sind < 5) {
+		send(((uint8_t*)&saddress)[sind-1],1);
+		return;
+	}
+	if (sind == 5) {
+		send(sctl,1);
+		return;
+	}
+	if (sind < 10) {
+		send(((uint8_t*)&my_address)[sind-6],1);
+		return;
+	}
+	if (sind == 10) {
+		send(slen+2,1);
+		return;
+	}
+	if (sind < slen+10) {
+		send(smessage[sind-11],1);
+		return;
+	}
+	if (sind == slen+10) {
+		send(smessage[sind-11],1);
+		return;
+	}
+	if (sind == slen+11) {
+		send((scrc >> 8) & 0xFF,2);
+		return;
+	}
+	if (sind == slen+12) {
+		send(scrc & 0xFF,0);
+		return;
+	}
+	if (bit_is_set(UCSR0A, TXC0)) {
+		PORTD  &= ~(1<<SenderEnable);
+		PORTD  &= ~(1<<ReceiverDisable);
+		sind = 0;
+	}
+}
+
+static uint8_t sendmsg(void)
+{
+	if (sind)
+		return 0;
+
+	PORTD  |= (1<<SenderEnable);
+	PORTD  |= (1<<ReceiverDisable);
+	UCSR0A  = (1<<TXC0);
+
+	scrc = crc16shift(0xFFFF, 0xFD);
+	UDR0 = 0xFD;
+	sind = 1;
+	sesc = 0;
+	sdisc = 0;
+	return ~0;
+}
+
+static uint8_t senddsc(void)
+{
+	if (sind)
+		return 0;
+
+	PORTD  |= (1<<SenderEnable);
+	PORTD  |= (1<<ReceiverDisable);
+	UCSR0A  = (1<<TXC0);
+
+	scrc = crc16shift(0xFFFF, 0xFE);
+	UDR0 = 0xFE;
+	sind = 1;
+	sesc = 0;
+	sdisc = 1;
+	return ~0;
+}
+
+static uint8_t is_bus_free(void)
+{
+
+	if(sdelay - hbw_timer > 0x7FFF)
+		return 1;
+	return 0;
+}
+
+static void announce(void)
+{
+        sctl = 0xF8;
+
+        saddress = 0xFFFFFFFF;
+
+        slen = 16;
+
+        smessage[0] = 0x41;
+        smessage[1] = 0;
+        smessage[2] = HBWTYPE;
+        smessage[3] = 0;
+        smessage[4] = HBWMAJOR;
+        smessage[5] = HBWMINOR;
+        smessage[6] = HBWSERIAL0;
+        smessage[7] = HBWSERIAL1;
+        smessage[8] = HBWSERIAL2;
+        smessage[9] = HBWSERIAL3;
+        smessage[10] = HBWSERIAL4;
+        smessage[11] = HBWSERIAL5;
+        smessage[12] = HBWSERIAL6;
+        smessage[13] = HBWSERIAL7;
+        smessage[14] = HBWSERIAL8;
+        smessage[15] = HBWSERIAL9;
+        sendmsg();
+
+	asent = 1;
+}
+
+void hbw_init(void)
+{
+	DDRD |= (1<<SenderEnable);
+	DDRD |= (1<<ReceiverDisable);
+
+	PORTD  &= ~(1<<SenderEnable);
+	PORTD  &= ~(1<<ReceiverDisable);
+
+#ifdef ConfigButton
+	DDRD &= ~(1<<ConfigButton);
+	PORTD |= (1<<ConfigButton);
+#endif
+
+#ifdef ConfigLED
+	DDRD |= (1<<ConfigLED);
+	PORTD &= ~(1<<ConfigLED);
+#endif
+
+	UBRR0L = ((F_CPU/(BAUDRATE*16))-1) & 0xFF;
+	UBRR0H = 0;
+	UCSR0B = (1 << TXEN0) | (1 << RXEN0) | (1 << RXCIE0);
+	UCSR0C = (1 << UPM01) | (1 << UCSZ01) | (1 << UCSZ00);
+
+        OCR2A = 0xF9;
+        TIMSK2 |= (1 << OCIE2A);
+        TCCR2A |= (1 << WGM21);
+        TCCR2B = TCCR2B | (1 << CS21) | (1 << CS20);
+
+	rind = 0;
+	sind = 0;
+	sdisc = 0;
+	rready = 0;
+	asent = 0;
+	hbw_timer = 0;
+	gotack = 0;
+	waitack = 0;
+	configled = 0;
+	configbutton = 0;
+	configstate = 0;
+
+	readaddr();
+	srand(my_address);
+	sdelay = 1000 + (rand() & 0x1F);
+	sei();
+}
+
+static void process(void)
+{
+	uint8_t seq,i;
+	uint16_t addr;
+
+	if ((rdest == my_address) &&
+	    (raddress == aaddress) &&
+	    waitack) {
+		waitack = 0;
+		gotack = 1;
+	}
+	if ((rdest == my_address) &&
+	    ((rctl & 0x11) == 0x10)) {
+		saddress = raddress;
+		seq = (rctl >> 1) & 3;
+		if(!rlen)
+			return;
+
+		switch (rmessage[0]) {
+			case '@':
+				if (rlen != 6)
+					return;
+				if (rmessage[1] == 'a') {
+					eeprom_write_byte((uint8_t *)EESIZE-4, rmessage[2]);
+					eeprom_write_byte((uint8_t *)EESIZE-3, rmessage[3]);
+					eeprom_write_byte((uint8_t *)EESIZE-2, rmessage[4]);
+					eeprom_write_byte((uint8_t *)EESIZE-1, rmessage[5]);
+
+					readaddr();
+				}
+				slen = 0;
+				sctl = 0x19 | (seq << 5);
+				sendmsg();
+				break;
+			case 'h':
+				smessage[0] = HBWTYPE;
+				smessage[1] = 0;
+				slen = 2;
+				sctl = 0x18 | (seq << 5);
+				sendmsg();
+				break;
+			case 'n':
+				smessage[0] = HBWSERIAL0;
+				smessage[1] = HBWSERIAL1;
+				smessage[2] = HBWSERIAL2;
+				smessage[3] = HBWSERIAL3;
+				smessage[4] = HBWSERIAL4;
+				smessage[5] = HBWSERIAL5;
+				smessage[6] = HBWSERIAL6;
+				smessage[7] = HBWSERIAL7;
+				smessage[8] = HBWSERIAL8;
+				smessage[9] = HBWSERIAL9;
+                                slen = 10;
+                                seq = (rctl >> 1) & 3;
+                                sctl = 0x18 | (seq << 5);
+                                sendmsg();
+				break;
+			case 'v':
+				if (rlen != 2)
+					return;
+                                smessage[0] = HBWMAJOR;
+                                smessage[1] = HBWMINOR;
+                                slen = 2;
+                                seq = (rctl >> 1) & 3;
+                                sctl = 0x18 | (seq << 5);
+                                sendmsg();
+				break;
+			case 'R':
+				if (rlen != 4)
+					return;
+				if (rmessage[3] > 62)
+					return;
+				addr = (rmessage[1] >> 8) | rmessage[2];
+				for (i = 0; i < rmessage[3]; i++)
+					smessage[i] = eeprom_read_byte((const uint8_t *)addr+i);
+				slen = rmessage[3];
+				seq = (rctl >> 1) & 3;
+				sctl = 0x18 | (seq << 5);
+				sendmsg();
+				break;
+			case 'W':
+				if (rlen <= 4)
+					return;
+				if (rlen != rmessage[3] + 4)
+					return;
+				addr = (rmessage[1] >> 8) | rmessage[2];
+				for (i = 0; i < rmessage[3]; i++)
+					eeprom_write_byte((uint8_t *)addr+i, rmessage[4+i]);
+				slen = 0;
+				sctl = 0x19 | (seq << 5);
+				sendmsg();
+				break;
+			case 'x':
+			case 's':
+				if (rlen <= 2)
+					return;
+				hbw_set_channel(rmessage[1], rlen - 2, &(rmessage[2]));
+			case 'S':
+				if (rlen < 2)
+					return;
+				smessage[0] = 'i';
+				smessage[1] = rmessage[1];
+				slen = hbw_get_channel(rmessage[1], &(smessage[2])) + 2;
+				seq = (rctl >> 1) & 3;
+				sctl = 0x18 | (seq << 5);
+				sendmsg();
+				break;
+			case 'C':
+				hbw_read_config();
+				slen = 0;
+				sctl = 0x19 | (seq << 5);
+				sendmsg();
+				break;
+		}
+	}
+}
+
+static void eeprom_clear(void)
+{
+	uint16_t i;
+
+	for (i=0; i < EESIZE-4; i++)
+		eeprom_write_byte((uint8_t *)i, 0xFF);
+}
+
+void hbw_loop(void)
+{
+	rloop();
+	if (rready) {
+		process();
+		rready = 0;
+	}
+	if (!asent) {
+		if (is_bus_free()) {
+			announce();
+		}
+	}
+
+#ifdef ConfigButton
+	switch (configstate) {
+		case 0:
+			if (bit_is_clear(PIND, ConfigButton)) {
+				configtimer = hbw_timer;
+				configstate = 1;
+				configled = 1;
+			}
+			break;
+		case 1:
+			if (((hbw_timer - configtimer) > 20) &&
+			     (bit_is_set(PIND, ConfigButton))) {
+				asent = 0;
+				configstate = 2;
+				configtimer = hbw_timer;
+			}
+			if ((hbw_timer - configtimer) > 8000) {
+				configstate = 3;
+				configtimer = hbw_timer;
+			}
+			break;
+		case 2:
+			if ((hbw_timer - configtimer) > 2000) {
+				configstate = 0;
+				configled = 0;
+			}
+			break;
+		case 3:
+			configled = ((hbw_timer % 400) > 200)?0:1;
+			if (bit_is_set(PIND, ConfigButton)) {
+				configstate = 4;
+				configtimer = hbw_timer;
+			}
+			break;
+		case 4:
+			configled = ((hbw_timer % 400) > 200)?0:1;
+			if (((hbw_timer - configtimer) > 2000) &&
+			     (bit_is_set(PIND, ConfigButton))) {
+				configstate = 0;
+				configled = 0;
+			}
+			if (((hbw_timer - configtimer) > 20) &&
+			     (bit_is_clear(PIND, ConfigButton))) {
+				configstate = 5;
+				configled = 0;
+				eeprom_clear();
+			}
+			break;
+		case 5:
+			if (((hbw_timer - configtimer) > 20) &&
+			     (bit_is_set(PIND, ConfigButton))) {
+				configstate = 0;
+				configled = 0;
+				asent = 0;
+			}
+	}
+#endif
+
+#ifdef ConfigLED
+	if (configled)
+		PORTD |= (1<<ConfigLED);
+	else
+		PORTD &= ~(1<<ConfigLED);
+#endif
+}
+
+uint8_t hbw_send_channel(uint8_t channel, uint8_t length, uint8_t const * const data, uint32_t target_address)
+{
+	if (gotack) {
+		gotack = 0;
+		waitack = 0;
+		return 1;
+	}
+
+	if (!is_bus_free())
+		return 0;
+
+	if(waitack > 2) {
+		waitack = 0;
+		return 2;
+	}
+
+	slen = length + 2;
+	sctl = 0xF8;
+	aaddress = target_address;
+	if(aaddress == 0) {
+		((uint8_t*)&aaddress)[0]=eeprom_read_byte((const uint8_t *)2);
+		((uint8_t*)&aaddress)[1]=eeprom_read_byte((const uint8_t *)3);
+		((uint8_t*)&aaddress)[2]=eeprom_read_byte((const uint8_t *)4);
+		((uint8_t*)&aaddress)[3]=eeprom_read_byte((const uint8_t *)5);
+	//	aaddress = eeprom_read_dword((const uint32_t *)2);
+	}
+
+	saddress = aaddress;
+	smessage[0] = 'i';
+	smessage[1] = channel;
+	memcpy(&(smessage[2]), data, length);
+	sendmsg();
+	if (aaddress == 0xFFFFFFFF)
+		return 1;
+
+	waitack++;
+	gotack = 0;
+	sdelay = hbw_timer + 100 + (rand() & 0x1F);
+	return 0;
+}
+
+ISR(USART_RX_vect)
+{
+	uint8_t c;
+
+	sdelay = hbw_timer + 100 + (rand() & 0x1F);
+
+	c = UDR0;
+	if (c == 0xFE) {
+		rind = 255;
+		resc = 0;
+	}
+	if (c == 0xFD) {
+		rind = 0;
+		resc = 0;
+		rready = 0;
+		rcrc =0xFFFF;
+	}
+	if (rind < 255) {
+		if (c == 0xFC) {
+			resc = 1;
+			return;
+		}
+		if (resc)
+			c = c | 0x80;
+		rcrc = crc16shift(rcrc, c);
+		resc = 0;
+		rind++;
+	}
+	if ((rind == 1) || (rind == 255))
+		return;
+	if (rind < 6) {
+		((uint8_t*)&rdest)[rind-2] = c;
+		return;
+	}
+	if (rind == 6) {
+		rctl = c;
+		return;
+	}
+	if (rind < 11) {
+		((uint8_t*)&raddress)[rind-7] = c;
+		return;
+	}
+	if (rind == 11) {
+		rlen = c;
+		return;
+	}
+	if ((rlen < 2) || (rlen > 64)) {
+		rind = 255;
+		return;
+	}
+	if ((rind < rlen + 10)) {
+		rmessage[rind-12] = c;
+		return;
+	}
+	if (rind == rlen + 10)
+		return;
+	if (rind == rlen + 11) {
+		rind = 255;
+		if (rcrc)
+			return;
+		rready = 1;
+		rlen = rlen - 2;
+		return;
+	}
+}
+
+
+ISR(TIMER2_COMPA_vect)
+{
+	cli();
+	hbw_timer++;
+	sei();
+}
diff --git a/hbw.h b/hbw.h
new file mode 100644
index 0000000..08eb053
--- /dev/null
+++ b/hbw.h
@@ -0,0 +1,20 @@
+#ifndef __HBW_H__
+#define __HBW_H__
+
+#define BAUDRATE 19200L
+
+uint8_t hbw_rmessage[62];
+uint8_t hbw_rlen;
+
+uint8_t hbw_slen;
+uint8_t hbw_smessage[62];
+
+volatile uint16_t hbw_timer;
+
+void hbw_init(void);
+void hbw_loop(void);
+uint8_t hbw_send_channel(uint8_t channel, uint8_t length, uint8_t const * const data, uint32_t target_address);
+uint8_t hbw_get_channel(uint8_t channel, uint8_t data[]);
+void hbw_set_channel(uint8_t channel, uint8_t len, uint8_t data[]);
+void hbw_read_config(void);
+#endif
diff --git a/hbw_el_alarm.xml b/hbw_el_alarm.xml
new file mode 100644
index 0000000..25064d0
--- /dev/null
+++ b/hbw_el_alarm.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0"?>
+<device eep_size="512" version="01">
+<supported_types>
+	<type priority="2" id="HBW-EBALARM" name="EBus Alarm HBW">
+		<parameter const_value="0xAB" size="1" index="0"/>
+		<parameter const_value="0" size="1" index="1"/>
+	</type>
+</supported_types>
+
+<paramset id="HBW-EBALARM_dev_master" type="MASTER">
+	<parameter id="LOGGING_TIME">
+		<logical type="float" unit="s" default="5.0" max="25.5" min="0.1"/>
+		<physical size="1.0" type="integer" interface="eeprom">
+			<address index="0x0001"/>
+		</physical>
+		<conversion type="float_integer_scale" offset="0.0" factor="10"/>
+	</parameter>
+	<parameter id="CENTRAL_ADDRESS" hidden="true">
+		<logical type="integer"/>
+		<physical size="4" type="integer" interface="eeprom">
+			<address index="0x0002"/>
+		</physical>
+	</parameter>
+	<enforce id="CENTRAL_ADDRESS" value="1"/>
+</paramset>
+
+<channels>
+	<channel index="0" type="MAINTENANCE" count="1" class="maintenance" ui_flags="internal">
+	</channel>
+	<channel index="1" type="SWITCH" count="1" physical_index_offset="-1">
+	</channel>	
+</channels>
+
+</device>
diff --git a/hbw_el_relais.xml b/hbw_el_relais.xml
new file mode 100644
index 0000000..d18511d
--- /dev/null
+++ b/hbw_el_relais.xml
@@ -0,0 +1,90 @@
+<?xml version="1.0"?>
+<device eep_size="512" version="01">
+<supported_types>
+	<type priority="2" id="HBW-EBRELAIS" name="Elektor EBus Relais Board">
+		<parameter const_value="0xE1" size="1" index="0"/>
+		<parameter const_value="0" size="1" index="1"/>
+	</type>
+</supported_types>
+
+<paramset id="HBW-EBRELAIS_dev_master" type="MASTER">
+	<parameter id="LOGGING_TIME">
+		<logical type="float" unit="s" default="5.0" max="25.5" min="0.1"/>
+		<physical size="1.0" type="integer" interface="eeprom">
+			<address index="0x0001"/>
+		</physical>
+		<conversion type="float_integer_scale" offset="0.0" factor="10"/>
+	</parameter>
+	<parameter id="CENTRAL_ADDRESS" hidden="true">
+		<logical type="integer"/>
+		<physical size="4" type="integer" interface="eeprom">
+			<address index="0x0002"/>
+		</physical>
+	</parameter>
+	<enforce id="CENTRAL_ADDRESS" value="1"/>
+</paramset>
+
+<frames>
+	<frame id="LEVEL_SET" type="#x" channel_field="10" direction="to_device">
+		<parameter size="1.0" index="11.0" type="integer" param="LEVEL"/>
+	</frame>
+	<frame id="LEVEL_GET" type="#S" channel_field="10" direction="to_device"/>
+	<frame id="INFO_LEVEL" type="#i" channel_field="10" direction="from_device" event="true">
+		<parameter size="1.0" index="11.0" type="integer" param="LEVEL"/>
+	</frame>
+</frames>
+
+
+<channels>
+	<channel index="0" type="MAINTENANCE" count="1" class="maintenance" ui_flags="internal">
+	</channel>
+	<channel index="1" type="SWITCH" count="2" physical_index_offset="-1">
+		<paramset id="hmw_switch_ch_master" type="MASTER" address_step="2" address_start="0x06">
+			<parameter id="LOGGING">
+				<logical type="option">
+					<option id="OFF"/>
+					<option id="ON" default="true"/>
+				</logical>
+				<physical size="0.1" type="integer" interface="eeprom">
+					<address index="+0"/>
+				</physical>
+			</parameter>
+		</paramset>
+		<paramset id="hmw_switch_ch_values" type="VALUES">
+			<parameter id="STATE" operations="read,write,event" control="SWITCH.STATE">
+				<logical type="boolean" default="false"/>
+				<physical type="integer" interface="command" value_id="LEVEL">
+					<set request="LEVEL_SET"/>
+					<get request="LEVEL_GET" response="INFO_LEVEL"/>
+					<event frame="INFO_LEVEL"/>
+				</physical>
+				<conversion type="boolean_integer" true="200" false="0" threshold="1"/>
+			</parameter>
+		</paramset>
+	</channel>
+	<channel index="3" type="SENSOR" count="2" physical_index_offset="-1">
+		<paramset id="hmw_sensor_ch_master" type="MASTER" address_step="2" address_start="0x08">
+			<parameter id="LOGGING">
+				<logical type="option">
+					<option id="OFF"/>
+					<option id="ON" default="true"/>
+				</logical>
+				<physical size="0.1" type="integer" interface="eeprom">
+					<address index="+0"/>
+				</physical>
+			</parameter>
+		</paramset>
+		<paramset id="hmw_sensor_ch_values" type="VALUES">
+			<parameter id="STATE" operations="read,event" control="SWITCH.STATE">
+				<logical type="boolean" default="false"/>
+				<physical type="integer" interface="command" value_id="LEVEL">
+					<get request="LEVEL_GET" response="INFO_LEVEL"/>
+					<event frame="INFO_LEVEL"/>
+				</physical>
+				<conversion type="boolean_integer" true="200" false="0" threshold="1"/>
+			</parameter>
+		</paramset>
+	</channel>
+</channels>
+
+</device>
diff --git a/hbw_el_test.xml b/hbw_el_test.xml
new file mode 100644
index 0000000..0517e01
--- /dev/null
+++ b/hbw_el_test.xml
@@ -0,0 +1,89 @@
+<?xml version="1.0"?>
+<device eep_size="512" version="01">
+<supported_types>
+	<type priority="2" id="HBW-EBTEST" name="Elektor EBus Test Board">
+		<parameter const_value="0xE0" size="1" index="0"/>
+		<parameter const_value="0" size="1" index="1"/>
+	</type>
+</supported_types>
+
+<paramset id="HBW-EBTEST_dev_master" type="MASTER">
+	<parameter id="LOGGING_TIME">
+		<logical type="float" unit="s" default="5.0" max="25.5" min="0.1"/>
+		<physical size="1.0" type="integer" interface="eeprom">
+			<address index="0x0001"/>
+		</physical>
+		<conversion type="float_integer_scale" offset="0.0" factor="10"/>
+	</parameter>
+	<parameter id="CENTRAL_ADDRESS" hidden="true">
+		<logical type="integer"/>
+		<physical size="4" type="integer" interface="eeprom">
+			<address index="0x0002"/>
+		</physical>
+	</parameter>
+	<enforce id="CENTRAL_ADDRESS" value="1"/>
+</paramset>
+
+<frames>
+	<frame id="LEVEL_SET" type="#x" channel_field="10" direction="to_device">
+		<parameter size="1.0" index="11.0" type="integer" param="LEVEL"/>
+	</frame>
+	<frame id="LEVEL_GET" type="#S" channel_field="10" direction="to_device"/>
+	<frame id="INFO_LEVEL" type="#i" channel_field="10" direction="from_device" event="true">
+		<parameter size="1.0" index="11.0" type="integer" param="LEVEL"/>
+	</frame>
+</frames>
+
+<channels>
+	<channel index="0" type="MAINTENANCE" count="1" class="maintenance" ui_flags="internal">
+	</channel>
+	<channel index="1" type="SWITCH" count="1" physical_index_offset="-1">
+		<paramset id="hmw_switch_ch_master" type="MASTER" address_step="2" address_start="0x06">
+			<parameter id="LOGGING">
+				<logical type="option">
+					<option id="OFF"/>
+					<option id="ON" default="true"/>
+				</logical>
+				<physical size="0.1" type="integer" interface="eeprom">
+					<address index="+0"/>
+				</physical>
+			</parameter>
+		</paramset>
+		<paramset id="hmw_switch_ch_values" type="VALUES">
+			<parameter id="STATE" operations="read,write,event" control="SWITCH.STATE">
+				<logical type="boolean" default="false"/>
+				<physical type="integer" interface="command" value_id="LEVEL">
+					<set request="LEVEL_SET"/>
+					<get request="LEVEL_GET" response="INFO_LEVEL"/>
+					<event frame="INFO_LEVEL"/>
+				</physical>
+				<conversion type="boolean_integer" true="200" false="0" threshold="1"/>
+			</parameter>
+		</paramset>
+	</channel>
+	<channel index="2" type="SENSOR" count="1" physical_index_offset="-1">
+		<paramset id="hmw_sensor_ch_master" type="MASTER" address_step="2" address_start="0x08">
+			<parameter id="LOGGING">
+				<logical type="option">
+					<option id="OFF"/>
+					<option id="ON" default="true"/>
+				</logical>
+				<physical size="0.1" type="integer" interface="eeprom">
+					<address index="+0"/>
+				</physical>
+			</parameter>
+		</paramset>
+		<paramset id="hmw_sensor_ch_values" type="VALUES">
+			<parameter id="STATE" operations="read,event" control="SWITCH.STATE">
+				<logical type="boolean" default="false"/>
+				<physical type="integer" interface="command" value_id="LEVEL">
+					<get request="LEVEL_GET" response="INFO_LEVEL"/>
+					<event frame="INFO_LEVEL"/>
+				</physical>
+				<conversion type="boolean_integer" true="200" false="0" threshold="1"/>
+			</parameter>
+		</paramset>
+	</channel>
+</channels>
+
+</device>
diff --git a/hw.h b/hw.h
new file mode 100644
index 0000000..de6e466
--- /dev/null
+++ b/hw.h
@@ -0,0 +1,46 @@
+#ifndef __HW_H__
+#define __HW_H__
+#define SenderEnable	PD2
+#define ReceiverDisable	PD3
+
+#ifdef TESTNODE
+#include "testhw.h"
+#endif
+#ifdef RELAISNODE
+#include "relaishw.h"
+#endif
+
+#ifndef F_CPU
+#define F_CPU 16000000L
+#endif
+
+#ifndef HBWTYPE
+#define HBWTYPE 0xAB
+#endif
+
+#ifndef HBWSERIAL0
+#define HBWSERIAL0 'C'
+#define HBWSERIAL1 'O'
+#define HBWSERIAL2 'L'
+#define HBWSERIAL3 'A'
+#define HBWSERIAL4 'B'
+#define HBWSERIAL5 'D'
+#define HBWSERIAL6 'E'
+#define HBWSERIAL7 'V'
+#define HBWSERIAL8 '0'
+#define HBWSERIAL9 '0'
+#endif
+
+#ifndef HBWMAJOR
+#define HBWMAJOR 0
+#endif
+
+#ifndef HBWMINOR
+#define HBWMINOR 0
+#endif
+
+#ifndef EESIZE
+#define EESIZE 512
+#endif
+
+#endif
diff --git a/relaishw.h b/relaishw.h
new file mode 100644
index 0000000..17dc968
--- /dev/null
+++ b/relaishw.h
@@ -0,0 +1,23 @@
+#ifndef __RELAISHW_H__
+#define __RELAISHW_H__
+
+#define ConfigLED	PD4
+#define ConfigButton	PD5
+#define Relais1		PB0
+#define Relais2		PB1
+
+#define HBWTYPE 0xE1
+#define HBWMAJOR 1
+#define HBWMINOR 2
+#define HBWSERIAL0 'C'
+#define HBWSERIAL1 'O'
+#define HBWSERIAL2 'L'
+#define HBWSERIAL3 'A'
+#define HBWSERIAL4 'B'
+#define HBWSERIAL5 'R'
+#define HBWSERIAL6 'E'
+#define HBWSERIAL7 'L'
+#define HBWSERIAL8 '0'
+#define HBWSERIAL9 '1'
+
+#endif
diff --git a/relaisnode.c b/relaisnode.c
new file mode 100644
index 0000000..3255c99
--- /dev/null
+++ b/relaisnode.c
@@ -0,0 +1,123 @@
+#include "hw.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/eeprom.h>
+#include "hbw.h"
+
+uint8_t relais1state;
+uint8_t relais2state;
+uint8_t pc0state;
+uint8_t pc1state;
+
+void hbw_read_config(void)
+{
+}
+
+uint8_t hbw_get_channel(uint8_t channel, uint8_t data[])
+{
+	if (channel == 0) {
+		if (bit_is_clear(PINB, Relais1))
+			data[0] = 0;
+		else
+			data[0] = 200;
+		return 1;
+	}
+	if (channel == 1) {
+		if (bit_is_clear(PINB, Relais2))
+			data[0] = 200;
+		else
+			data[0] = 0;
+		return 1;
+	}
+	if (channel == 2) {
+		if (bit_is_clear(PINC, PC0))
+			data[0] = 200;
+		else
+			data[0] = 0;
+		return 1;
+	}
+	if (channel == 3) {
+		if (bit_is_clear(PINC, PC1))
+			data[0] = 200;
+		else
+			data[0] = 0;
+		return 1;
+	}
+	return 0;
+}
+
+void hbw_set_channel(uint8_t channel, uint8_t len, uint8_t data[])
+{
+	if (channel == 0) {
+		if (data[0]) 
+			PORTB |= (1<<Relais1);
+		else
+			PORTB &= ~(1<<Relais1);
+	}
+	if (channel == 1) {
+		if (data[0]) 
+			PORTB |= (1<<Relais2);
+		else
+			PORTB &= ~(1<<Relais2);
+	}
+}
+
+int main(void)
+{
+	uint8_t state;
+
+	DDRB |= (1<<Relais1);
+	DDRB |= (1<<Relais2);
+
+	DDRC &= ~(1<<PC0);
+	DDRC &= ~(1<<PC1);
+
+	PORTB &= ~(1<<Relais1);
+	PORTB &= ~(1<<Relais2);
+
+	PORTC |= (1<<PC0);
+	PORTC |= (1<<PC1);
+
+	relais1state = 0;
+	relais2state = 0;
+	pc0state = 0;
+	pc1state = 0;
+
+	hbw_init();
+
+	while(1) {
+		hbw_loop();
+
+		if (bit_is_clear(PINC, PC0) && (!pc0state)) {
+			state = 200;
+			
+			if (hbw_send_channel(2, 1, &state, 0)) {
+				pc0state = ~0;
+			}
+		}
+
+		if (bit_is_set(PINC, PC0) && pc0state) {
+			state = 0;
+
+			if (hbw_send_channel(2, 1, &state, 0)) {
+				pc0state = 0;
+			}
+		}
+
+		if (bit_is_clear(PINC, PC1) && (!pc1state)) {
+			state = 200;
+			
+			if (hbw_send_channel(3, 1, &state, 0)) {
+				pc1state = ~0;
+			}
+		}
+
+		if (bit_is_set(PINC, PC1) && pc1state) {
+			state = 0;
+
+			if (hbw_send_channel(3, 1, &state, 0)) {
+				pc1state = 0;
+			}
+		}
+	}
+}
diff --git a/testhw.h b/testhw.h
new file mode 100644
index 0000000..e650c63
--- /dev/null
+++ b/testhw.h
@@ -0,0 +1,23 @@
+#ifndef __TESTHW_H__
+#define __TESTHW_H__
+
+#define ConfigLED	PD4
+#define ConfigButton	PD5
+#define ExpLED		PD6
+#define ExpButton	PD7
+
+#define HBWTYPE 0xE0
+#define HBWMAJOR 1
+#define HBWMINOR 2
+#define HBWSERIAL0 'C'
+#define HBWSERIAL1 'O'
+#define HBWSERIAL2 'L'
+#define HBWSERIAL3 'A'
+#define HBWSERIAL4 'B'
+#define HBWSERIAL5 'T'
+#define HBWSERIAL6 'S'
+#define HBWSERIAL7 'T'
+#define HBWSERIAL8 '0'
+#define HBWSERIAL9 '1'
+
+#endif
diff --git a/testnode.c b/testnode.c
new file mode 100644
index 0000000..64e076d
--- /dev/null
+++ b/testnode.c
@@ -0,0 +1,77 @@
+#include "hw.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/eeprom.h>
+#include "hbw.h"
+
+uint8_t expled;
+uint8_t expbutton;
+
+void hbw_read_config(void)
+{
+}
+
+uint8_t hbw_get_channel(uint8_t channel, uint8_t data[])
+{
+	if (channel == 1) {
+		if (bit_is_clear(PIND, ExpButton))
+			data[0] = 200;
+		else
+			data[0] = 0;
+		return 1;
+	}
+	if (channel == 0) {
+		if (bit_is_clear(PIND, ExpLED))
+			data[0] = 0;
+		else
+			data[0] = 200;
+		return 1;
+	}
+	return 0;
+}
+
+void hbw_set_channel(uint8_t channel, uint8_t len, uint8_t data[])
+{
+	if (channel == 0) {
+		if (data[0]) 
+			PORTD |= (1<<ExpLED);
+		else
+			PORTD &= ~(1<<ExpLED);
+	}
+}
+
+int main(void)
+{
+	uint8_t state;
+
+	DDRD |= (1<<ExpLED);
+	DDRD &= ~(1<<ExpButton);
+
+	PORTD &= ~(1<<ExpLED);
+	PORTD |= (1<<ExpButton);
+
+	expled = 0;
+	expbutton = 0;
+
+	hbw_init();
+
+	while(1) {
+		hbw_loop();
+
+		if (bit_is_clear(PIND, ExpButton) && (!expbutton)) {
+			state = 200;
+			
+			if (hbw_send_channel(1, 1, &state, 0)) {
+				expbutton = ~0;
+			}
+		}
+
+		if (bit_is_set(PIND, ExpButton) && expbutton) {
+			state = 0;
+
+			if (hbw_send_channel(1, 1, &state, 0)) {
+				expbutton = 0;
+			}
+		}
+	}
+}