/**
* funkcia precita registre,teplotu zo zariadenia DS18B20,\n
* urcena pre pracu s viacerimi zariadeniami na zbernici
* @param REG[9] vystupny smernik kde sa ulozia hodnoty registrov
* @param ROM[8] vstupny smernik urcujuci konkretne zariadenie
* @return ak vrati 0 operacia prebehla uspesne, ak nie nastala chyba
*/
char read_tempreature(uchar REG[9],uchar ROM[8])
{
unsigned int i;
inicializacia();
reset_onewire();
TX_WR(0x55);// match ROM
CR_WR(RST_SLOT|TX_SLOT);//prikaz reset+vysielanie
while(CR_RD()&BUSY);//cakanie na ukoncenie vysielania
if (!(CR_RD()&PRESENSE))return NO_PRESENSE;//kontrola presense pulzu
for (i=0;i<=7;i++){//rom
TX_WR(ROM[i]);
CR_WR(CR_RD()|TX_SLOT);
while(CR_RD()&BUSY);
}
TX_WR(0xBE);//prikaz posli teplotu
CR_WR(CR_RD()|TX_SLOT);//prikaz vysielanie
while(CR_RD()&BUSY);//cakanie na ukoncenie vysielania
reset_onewire();
for (i=0;i<9;i++){
CR_WR(CR_RD()|RX_SLOT);//primanie dat
while(CR_RD()&BUSY);
REG[i] = RX_RD();
if (i==8 && CRC_RD()){
return WRONG_CRC;
}
}
return TRANSACTION_OK;
}
/* mid-level functions */
int8_t noinline ow_read_rom(ow_rom_code_t *rom)
{
#if ONEWIRE_BUSCOUNT > 1
uint8_t busmask = 1 << (ONEWIRE_STARTPIN); // FIXME: currently only on 1st bus
#else
uint8_t busmask = ONEWIRE_BUSMASK;
#endif
/* reset the bus */
if (!reset_onewire(busmask))
return -1;
/* transmit command byte */
ow_write_byte(busmask, OW_ROM_READ_ROM);
/* read 64bit rom code */
for (uint8_t i = 0; i < 8; i++) {
/* read byte */
rom->bytewise[i] = ow_read_byte(busmask);
}
/* check CRC (last byte) */
if (rom->crc != crc_checksum(rom->bytewise, 7))
return -2;
return 1;
}
/**
* funkcia precita teplotu,registre zo zariadenia DS18B20, \n
* citanie iba ak je na zbernici jedino zriadenie
* @param REG[8] smernik vracajuci hodnotu vycitanych registrov
* @return ak vrati 0 operacia prebehla uspesne, ak nie nastala chyba
*/
char read_temperature_single(uchar REG[9]){
unsigned int i;
inicializacia();
reset_onewire();
TX_WR(0xCC);//preskoc match ROM
CR_WR(RST_SLOT|TX_SLOT);//prikaz reset+vysielanie
while(CR_RD()&BUSY);//cakanie na ukoncenie vysielania
if (!(CR_RD()&PRESENSE))return NO_PRESENSE;//kontrola presense pulzu
TX_WR(0xBE);//prikaz posli teplotu
CR_WR(CR_RD()|TX_SLOT);//prikaz vysielanie
while(CR_RD()&BUSY);//cakanie na ukoncenie vysielania
for (i=0;i<8;i++){
CR_WR(CR_RD()|RX_SLOT);//primanie dat
while(CR_RD()&BUSY);
REG[i] = RX_RD();
if (i==8 && CRC_RD()){
return WRONG_CRC;
//printf("chyba v CRC 0x%x",CRC_RD());
}
}
return TRANSACTION_OK;//funkcia prebehla uspesne
}
/**
* funkcia vysle prikaz do zariadenia DS18B20 na prevod teploty,\n
* urcena pre pracu s viacerimi zariadeniami
* @param ROM[8] vstupny smernik urcujuci konkretne zariadenie
* @return ak vrati 0 operacia prebehla uspesne, ak nie nastala chyba
*/
char conversion( uchar ROM[8])
{
uchar i;
inicializacia();
reset_onewire();
TX_WR(0x55);//match ROM
CR_WR(RST_SLOT|TX_SLOT);//prikaz reset+vysielanie
while(CR_RD()&BUSY);// cakanie na ukoncenie vysielania
if (!(CR_RD()&PRESENSE))return NO_PRESENSE;//kontrola presense pulzu
for (i=0;i<=7;i++){//rom
TX_WR(ROM[i]);
CR_WR(CR_RD()|TX_SLOT);
while(CR_RD()&BUSY);
}
TX_WR(0x44);//prikaz vykonaj konverziu teploty
CR_WR(CR_RD()|TX_SLOT);
while(CR_RD()&BUSY);
return TRANSACTION_OK;//funkcia prebehla uspesne
}
int8_t noinline ow_skip_rom(void)
{
/* reset the bus */
if (!reset_onewire(ONEWIRE_BUSMASK))
return -1;
/* transmit command byte */
ow_write_byte(ONEWIRE_BUSMASK, OW_ROM_SKIP_ROM);
return 1;
}
/**
* funkcia vysle prikaz do zariadenia/zariadeni DS18B20 na prevod teploty,\n
* urcena pre pracu s jedinym zariadenim na zbernici. \n
* Tuto funkciu mozno pouzit aj ak je na zbernici viacero zariadeni,\n
* prevod sa vykona na vsetkych zariadeniach naraz
* @return ak vrati 0 operacia prebehla uspesne, ak nie nastala chyba
*/
char conversion_single(void)
{
inicializacia();
reset_onewire();
TX_WR(0xCC);//preskoc match ROM
CR_WR(RST_SLOT|TX_SLOT);//prikaz reset+vysielanie
while(CR_RD()&BUSY);// cakanie na ukoncenie vysielania
if (!(CR_RD()&PRESENSE))return NO_PRESENSE;//kontrola presense pulzu
TX_WR(0x44);//prikaz vykonaj konverziu teploty
CR_WR(CR_RD()|TX_SLOT);
while(CR_RD()&BUSY);
return TRANSACTION_OK;//funkcia prebehla uspesne
}
int8_t noinline ow_match_rom(ow_rom_code_t *rom)
{
/* reset the bus */
if (!reset_onewire(ONEWIRE_BUSMASK))
return -1;
/* transmit command byte */
ow_write_byte(ONEWIRE_BUSMASK, OW_ROM_MATCH_ROM);
/* transmit rom code */
for (uint8_t i = 0; i < 8; i++) {
for (uint8_t j = 0; j < 8; j++) {
ow_write(ONEWIRE_BUSMASK, (uint8_t)(rom->bytewise[i] & _BV(j)));
}
}
return 1;
}
/**
* funkcia precita ROM jedneho zariadenia DS18B20 \n
* je urcena pre pracu s jedinym zariadenim na zbernici
* @param ROM[8] smernik vracauci ROM
* @return ak vrati 0 operacia prebehla uspesne, ak nie nastala chyba
*/
char read_rom(uchar ROM[8])
{
uchar i;
inicializacia();
reset_onewire();
TX_WR(0x33);//prikaz posli ROM
CR_WR(RST_SLOT|TX_SLOT);//prikaz vysielanie+reset
while(CR_RD()&BUSY);//cakanie na ukoncenie vysielania
if (!(CR_RD()&PRESENSE))return NO_PRESENSE;//kontrola presense pulzu
for (i=0;i<=7;i++){
CR_WR(CR_RD()|RX_SLOT);//primanie dat
while(CR_RD()&BUSY);
ROM[i]=RX_RD();
if (i==7 && CRC_RD()){
return WRONG_CRC;
}
}
return TRANSACTION_OK;
}
/* high-level functions */
int8_t noinline ow_search_rom(uint8_t busmask, uint8_t first)
{
/* reset discover state machine */
if (first) {
ow_global.last_discrepancy = -1;
/* reset rom code */
for (uint8_t i = 0; i < 8; i++)
ow_global.current_rom.bytewise[i] = 0;
} else {
/* if last_discrepancy is below zero, discovery is done */
if (ow_global.last_discrepancy < 0)
return 0;
}
int8_t discrepancy = -1;
/* reset the bus */
if (!reset_onewire(busmask))
return -1;
/* transmit command byte */
ow_write_byte(busmask, OW_ROM_SEARCH_ROM);
for (uint8_t i = 0; i <64; i++) {
/* read bits */
uint8_t bit1 = ow_read(busmask);
uint8_t bits = (uint8_t)((ow_read(busmask) << 1) | bit1);
if (bits == 3) {
/* no devices, just return */
return 0;
} else if (bits == 0) {
if (i == ow_global.last_discrepancy) {
/* set one */
ow_set_address_bit(&ow_global.current_rom, i, 1);
/* transmit one next time */
bit1 = 1;
} else if (i > ow_global.last_discrepancy) {
/* set zero */
ow_set_address_bit(&ow_global.current_rom, i, 0);
discrepancy = (int8_t)i;
} else {
uint8_t rom_bit = (uint8_t)(ow_global.current_rom.bytewise[i / 8] & _BV(i % 8));
if (rom_bit == 0)
discrepancy = (int8_t)i;
/* transmit last bit next time */
bit1 = rom_bit;
}
} else {
/* normal case, no discrepancy */
ow_set_address_bit(&ow_global.current_rom, i, bit1);
}
OW_CONFIG_OUTPUT(busmask);
/* select next bit */
ow_write(busmask, bit1);
}
ow_global.last_discrepancy = discrepancy;
/* new device discovered */
return 1;
}
//!--------------------------------------------------------------------------
//! Reset the 1-Wire bus and return the presence of any device
//! @return TRUE : device present
//! FALSE : no device present
//!
int OWReset()
{
inicializacia();
reset_onewire();
return TRUE;
}
