therm-led/1wire.c

#include "1wire.h"
#include <util/delay.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#define SEARCHROM
#undef INITST

#ifdef SEARCHROM
#ifdef INITST
extern unsigned char initst;
#endif
#endif

unsigned char _1WireInit(void){
	unsigned char wyj=0;
	_1WPORT &= ~_1WL;
	ZERO;
	_delay_us(480);
//	cli();
	JEDEN;
	_delay_us(70);
	if(!WYS) wyj++;
//	sei();
	_delay_us(410);
	if(!WYS) wyj++;
	return wyj; // 0 - zwarcie, 1 - ok, 2 - rozwarcie
}

void _1WireWriteByte(unsigned char dana){
	register unsigned char i;
	for(i=0;i<8;i++){
		_1WireWriteSlot(dana&1,0);
		dana >>= 1;
	}
}

void _1WireWriteBytePR(unsigned char dana){ //natychmiast po poleceniu włącz zasilanie
	register unsigned char i;
	for(i=0;i<7;i++){
		_1WireWriteSlot(dana&1,0);
		dana >>= 1;
	}
	_1WireWriteSlot(dana,1);
	_1WPORT |= _1WL;
	_1WDDR |= _1WL;
//	sei();
	if(!WYS) _1WirePoweroff();
}


void _1WireWriteSlot(unsigned char x, unsigned char pr){
//	cli();
	ZERO;
	if(x) _delay_us(6); else _delay_us(60);
	JEDEN;
	if(x) _delay_us(64); else _delay_us(10);
	if(!pr) sei();
	_delay_us(1);
}

unsigned char _1WireReadByte(void){
	register unsigned char i=1;
	unsigned char dana=0;
	while(i){
		if(_1WireReadSlot()) dana |= i;
		i <<= 1;
	}
	return dana;
}

unsigned char _1WireReadSlot(void){
	unsigned char wyj=0;
//	cli();
	ZERO;
	_delay_us(6);
	JEDEN;
	_delay_us(9);
	if(WYS) wyj=1;
//	sei();
	_delay_us(55);
	return wyj;
}
/*
void _1WirePoweroff(void){ //wyłacz zasilanie
	_1WDDR &= ~_1WL;
	_1WPORT &= ~_1WL;
}*/

#ifdef SEARCHROM

unsigned char _1WireSearch(unsigned char rv, unsigned char *buf){
	unsigned char i,a,b,mask=1,lz=0;
#ifdef INITST
	if((initst = _1WireInit())!=1) return 0xff;
#else
	if(_1WireInit()!=1) return 0xff;
#endif
	_1WireWriteByte(0xf0);
	for(i=1;i<65;i++){
		a = _1WireReadSlot();
		b = _1WireReadSlot();
		if(a && b) return 0xff;
		if(a==b) {
			if(i>rv) a = 0;
			else if(i==rv) a = 1;
			else a = !!((*buf)&mask);
			if(!a) lz=i;
		}
		_1WireWriteSlot(a,0);
		if(a) (*buf)|=mask; else (*buf)&=~mask;
		mask<<=1;
		if(!mask){
			mask = 1;
			buf++;
		}
	}
	rv=lz;
	return rv;
}

void _1WireSendRom(unsigned char *rom){
	register unsigned char i;
	for(i=0;i<8;i++){
		_1WireWriteByte(rom[i]);
	}
}
#endif
/*

	unsigned char tablica_z_adresami[MAX_NUM][8];
	unsigned char rom[8];
	unsigned char i=0, rv=0;
	do {
		rv = _1WireSearch(rv, rom);
		memcpy(tablica_z_adresami[i], rom, 8);
		i++;
	} while(rv && i<MAX_NUM);*/