#ifndef _ONEWIRE_H_
#define _ONEWIRE_H_


// Status register bits
#define STATUS_DIR 0x80
#define STATUS_TSB 0x40
#define STATUS_SBR 0x20
#define STATUS_RST 0x10
#define STATUS_LL  0x08
#define STATUS_SD  0x04
#define STATUS_PPD 0x02
#define STATUS_1WB 0x01

// Config register bits
#define CONFIG_1WS 0x08
#define CONFIG_SPU 0x04
#define CONFIG_PPM 0x02
#define CONFIG_APU 0x01

// DS2482 I2C commands
#define DS2482_DEVRESET 0xF0
#define DS2482_READPOINTER 0xE1
#define DS2482_WRITECONF 0xD2
#define DS2482_1WRESET 0xB4
#define DS2482_WRITEBIT 0x87
#define DS2482_WRITEBYTE 0xA5
#define DS2482_READBYTE 0x96
#define DS2482_TRIPLET 0x78

// DS2482 registers
#define DS2482REG_STATUS 0xF0
#define DS2482REG_READ 0xE1
#define DS2482REG_CONF 0xC3

// 1-wire commands common to all devices
#define OW_SEARCHROM 0xF0
#define OW_READROM 0x33
#define OW_MATCHROM 0x55
#define OW_SKIPROM 0xCC
#define OW_ALARMSEARCH 0xEC


struct owaddr {
	// LSB first
	unsigned char family;
	unsigned char id[6];
	unsigned char crc;
};

void ds2482_config(unsigned char config);
void ow_spu(int strong_pullup);
unsigned char ow_wait();
unsigned char ow_reset();
unsigned char ow_triplet(int direction);
void ow_readbytes(unsigned char *buf, int count);
void ow_writebytes(unsigned char *buf, int count);
void ow_writecommand(unsigned char command);
int ow_readbit();
unsigned char ow_crc(unsigned char *buf, int count);
int owaddr_getbit(const struct owaddr *addr, int bitno);
void owaddr_setbit(struct owaddr *addr, int bitno, int value);
void owaddr_copy(struct owaddr *dest, const struct owaddr *src, int startbit, int count);
int ow_bussearch(void (*resultfunc)(struct owaddr *));
void ow_matchrom(const struct owaddr *addr);
void ow_initialize(char *device);


#endif