commit 221905f27c17e9d396b218dbbfb6c23831532266
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..26adfa8
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,25 @@
+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)
+
+HBWOBJS += testnode.o hbw.o
+
+all: testnode.hex
+
+testnode.o: testnode.c hbw.h hw.h testhw.h
+	$(CC) $(CFLAGS) -DTESTNODE -c $< -o $@
+
+testnode.elf: $(HBWOBJS)
+	$(CC) $(CLDFLAGS) -o $@ $(HBWOBJS)
+
+%hex:%elf
+	$(OBJCOPY) -j .text -j .data -O srec $< $@
+
+clean:
+	rm -f *.hex *.elf *.o *.lst *.map
diff --git a/hbw.c b/hbw.c
new file mode 100644
index 0000000..6ca9ca4
--- /dev/null
+++ b/hbw.c
@@ -0,0 +1,297 @@
+#include "hw.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdlib.h>
+#include "hbw.h"
+
+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;
+}
+
+void hbw_send(uint8_t i,uint8_t crc)
+{
+	if (bit_is_set(UCSR0A, UDRE0)) {
+		if (sesc) {
+			UDR0 = i & 0x7F;
+			sind++;
+			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 hbw_loop(void)
+{
+	if (!sind)
+		return;
+
+	if (sdisc) {
+		if (sind == 1) {
+			hbw_send(0x04,1);
+			return;
+		}
+		if (sind == 2) {
+			hbw_send(0x01,1);
+			return;
+		}
+		if (sind == 3) {
+			hbw_send((scrc >> 8) & 0xFF,2);
+			return;
+		}
+		if (sind == 4) {
+			hbw_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) {
+		hbw_send(saddress[sind-1],1);
+		return;
+	}
+	if (sind == 5) {
+		hbw_send(sctl,1);
+		return;
+	}
+	if (sind < 10) {
+		hbw_send(my_address[sind-6],1);
+		return;
+	}
+	if (sind == 10) {
+		hbw_send(slen+2,1);
+		return;
+	}
+	if (sind < slen+10) {
+		hbw_send(smessage[sind-11],1);
+		return;
+	}
+	if (sind == slen+10) {
+		hbw_send(smessage[sind-11],1);
+		return;
+	}
+	if (sind == slen+11) {
+		hbw_send((scrc >> 8) & 0xFF,2);
+		return;
+	}
+	if (sind == slen+12) {
+		hbw_send(scrc & 0xFF,0);
+		return;
+	}
+	if (bit_is_set(UCSR0A, TXC0)) {
+		PORTD  &= ~(1<<SenderEnable);
+		PORTD  &= ~(1<<ReceiverDisable);
+		sind = 0;
+	}
+}
+
+char 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;
+	rwant = 20 + (rand() & 0x0F);
+}
+
+char 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;
+}
+
+char is_bus_free(void)
+{
+
+	if(rlast < rwant)
+		return 0;
+	return 1;
+}
+
+void announce(void)
+{
+        sctl = 0xF8;
+
+        saddress[0] = 0xFF;
+        saddress[1] = 0xFF;
+        saddress[2] = 0xFF;
+        saddress[3] = 0xFF;
+
+        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;
+	while (!is_bus_free()) ;
+        sendmsg();
+}
+
+void init_hbw(void)
+{
+	DDRD |= (1<<SenderEnable);
+	DDRD |= (1<<ReceiverDisable);
+
+	PORTD  &= ~(1<<SenderEnable);
+	PORTD  &= ~(1<<ReceiverDisable);
+
+	UBRR0L = ((F_CPU/(BAUDRATE*16))-1) & 0xFF;
+	UBRR0H = 0;
+	UCSR0B = (1 << TXEN0) | (1 << RXEN0) | (1 << RXCIE0);
+	UCSR0C = (1 << UPM01) | (1 << UCSZ01) | (1 << UCSZ00);
+
+        OCR2A = 0x96;
+        TIMSK2 |= (1 << OCIE2A);
+        TCCR2A |= (1 << WGM21);
+        TCCR2B = TCCR2B | (1 << CS21) | (1 << CS20);
+
+	rind = 0;
+	sind = 0;
+	sdisc = 0;
+	rready = 0;
+	rlast = 0;
+
+	srand(my_address[3]);
+	rwant = 20 + (rand() & 0x0F);
+	sei();
+	announce();
+}
+
+ISR(USART_RX_vect)
+{
+	uint8_t c;
+
+	rlast = 0;
+
+	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) {
+		rdest[rind-2] = c;
+		return;
+	}
+	if (rind == 6) {
+		rctl = c;
+		return;
+	}
+	if (rind < 11) {
+		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;
+		return;
+	}
+}
+
+
+ISR(TIMER2_COMPA_vect)
+{
+	cli();
+	if (rlast < rwant)
+		rlast++;
+	sei();
+}
diff --git a/hbw.h b/hbw.h
new file mode 100644
index 0000000..563e924
--- /dev/null
+++ b/hbw.h
@@ -0,0 +1,33 @@
+#ifndef __HBW_H__
+#define __HBW_H__
+
+#define BAUDRATE 19200L
+
+uint8_t my_address[4];
+
+uint8_t rind;
+uint16_t rcrc;
+uint8_t rmessage[62];
+uint8_t raddress[4];
+uint8_t rdest[4];
+uint8_t rlen;
+uint8_t resc;
+uint8_t rctl;
+uint8_t rwant;
+volatile uint8_t rready;
+volatile uint8_t rlast;
+
+uint8_t sind;
+uint8_t sdisc;
+uint8_t sctl;
+uint16_t scrc;
+uint8_t slen;
+uint8_t sesc;
+uint8_t saddress[4];
+uint8_t smessage[62];
+
+void hbw_loop(void);
+char sendmsg(void);
+char senddsc(void);
+void init_hbw(void);
+#endif
diff --git a/hw.h b/hw.h
new file mode 100644
index 0000000..646e41f
--- /dev/null
+++ b/hw.h
@@ -0,0 +1,42 @@
+#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
+
+#endif
diff --git a/testhw.h b/testhw.h
new file mode 100644
index 0000000..d561aa4
--- /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 0xB0
+#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..a552d7c
--- /dev/null
+++ b/testnode.c
@@ -0,0 +1,103 @@
+#include "hw.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/eeprom.h>
+#include "hbw.h"
+
+uint8_t expled;
+uint8_t expbutton;
+
+uint8_t waitforack;
+uint8_t waitforsend;
+uint8_t acktimer;
+
+int main(void)
+{
+	uint8_t seq;
+
+	my_address[0]=eeprom_read_byte((const uint8_t *)0);
+	my_address[1]=eeprom_read_byte((const uint8_t *)1);
+	my_address[2]=eeprom_read_byte((const uint8_t *)2);
+	my_address[3]=eeprom_read_byte((const uint8_t *)3);
+
+	if ((my_address[0] == 0xFF) && 
+	    (my_address[1] == 0xFF) && 
+	    (my_address[2] == 0xFF) && 
+	    (my_address[3] == 0xFF))
+		my_address[0] = 0x74;
+
+	DDRD |= (1<<ConfigLED);
+	DDRD &= ~(1<<ConfigButton);
+	DDRD |= (1<<ExpLED);
+	DDRD &= ~(1<<ExpButton);
+
+	PORTD &= ~(1<<ConfigLED);
+	PORTD |= (1<<ConfigButton);
+	PORTD &= ~(1<<ExpLED);
+	PORTD |= (1<<ExpButton);
+
+	init_hbw();
+
+	while(1) {
+		hbw_loop();
+		if (rready) {
+			if ((rdest[0] == my_address[0]) &&
+			    (rdest[1] == my_address[1]) &&
+			    (rdest[2] == my_address[2]) &&
+			    (rdest[3] == my_address[3]) &&
+			    (rmessage[0] == 'h')) {
+				saddress[0] = raddress[0];
+				saddress[1] = raddress[1];
+				saddress[2] = raddress[2];
+				saddress[3] = raddress[3];
+				seq = (rctl >> 1) & 3;
+				sctl = 0x18 | (seq << 5);
+				smessage[0] = HBWTYPE;
+				smessage[1] = 0;
+				slen = 2;
+				sendmsg();
+			}
+			if ((rdest[0] == my_address[0]) &&
+			    (rdest[1] == my_address[1]) &&
+			    (rdest[2] == my_address[2]) &&
+			    (rdest[3] == my_address[3]) &&
+			    (rmessage[0] == 'n')) {
+				saddress[0] = raddress[0];
+				saddress[1] = raddress[1];
+				saddress[2] = raddress[2];
+				saddress[3] = raddress[3];
+				seq = (rctl >> 1) & 3;
+				sctl = 0x18 | (seq << 5);
+	smessage[0] = 'h';
+	smessage[1] = 'b';
+	smessage[2] = 'w';
+	smessage[3] = 'b';
+	smessage[4] = 'o';
+	smessage[5] = 'c';
+	smessage[6] = 'c';
+	smessage[7] = '0';
+	smessage[8] = '0';
+	smessage[9] = '1';
+				slen = 10;
+				sendmsg();
+			}
+			if ((rdest[0] == my_address[0]) &&
+			    (rdest[1] == my_address[1]) &&
+			    (rdest[2] == my_address[2]) &&
+			    (rdest[3] == my_address[3]) &&
+			    (rmessage[0] == 'v')) {
+				saddress[0] = raddress[0];
+				saddress[1] = raddress[1];
+				saddress[2] = raddress[2];
+				saddress[3] = raddress[3];
+				seq = (rctl >> 1) & 3;
+				sctl = 0x18 | (seq << 5);
+				smessage[0] = 1;
+				smessage[1] = 2;
+				slen = 2;
+				sendmsg();
+			}
+			rready = 0;
+		}
+	}
+}