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- #include <DS18B20.h>
- DS18B20::DS18B20(uint8_t pin) : oneWire(OneWire(pin)) {
- resetSearch();
- sendCommand(SKIP_ROM, READ_POWER_SUPPLY);
- globalPowerMode = oneWire.read_bit();
- while (selectNext()) {
- uint8_t resolution = getResolution();
- if (resolution > globalResolution) {
- globalResolution = resolution;
- }
- numberOfDevices++;
- }
- }
- uint8_t DS18B20::select(uint8_t address[]) {
- if (isConnected(address)) {
- memcpy(selectedAddress, address, 8);
- if (readScratchpad()) {
- selectedResolution = getResolution();
- sendCommand(MATCH_ROM, READ_POWER_SUPPLY);
- selectedPowerMode = oneWire.read_bit();
- return 1;
- }
- }
- return 0;
- }
- uint8_t DS18B20::selectNext() {
- if (oneWireSearch(SEARCH_ROM)) {
- return select(searchAddress);
- }
- return 0;
- }
- uint8_t DS18B20::selectNextAlarm() {
- if (oneWireSearch(ALARM_SEARCH)) {
- return select(searchAddress);
- }
- return 0;
- }
- void DS18B20::resetSearch() {
- lastDiscrepancy = 0;
- lastDevice = 0;
- }
- float DS18B20::getTempC() {
- sendCommand(MATCH_ROM, CONVERT_T, !selectedPowerMode);
- delayForConversion(selectedResolution, selectedPowerMode);
- readScratchpad();
- uint8_t lsb = selectedScratchpad[TEMP_LSB];
- uint8_t msb = selectedScratchpad[TEMP_MSB];
- switch (selectedResolution) {
- case 9:
- lsb &= 0xF8;
- break;
- case 10:
- lsb &= 0xFC;
- break;
- case 11:
- lsb &= 0xFE;
- break;
- }
- uint8_t sign = msb & 0x80;
- int16_t temp = (msb << 8) + lsb;
- if (sign) {
- temp = ((temp ^ 0xffff) + 1) * -1;
- }
- return temp / 16.0;
- }
- float DS18B20::getTempF() {
- return getTempC() * 1.8 + 32;
- }
- uint8_t DS18B20::getResolution() {
- switch (selectedScratchpad[CONFIGURATION]) {
- case RES_9_BIT:
- return 9;
- case RES_10_BIT:
- return 10;
- case RES_11_BIT:
- return 11;
- case RES_12_BIT:
- return 12;
- }
- }
- void DS18B20::setResolution(uint8_t resolution) {
- resolution = constrain(resolution, 9, 12);
- switch (resolution) {
- case 9:
- selectedScratchpad[CONFIGURATION] = RES_9_BIT;
- break;
- case 10:
- selectedScratchpad[CONFIGURATION] = RES_10_BIT;
- break;
- case 11:
- selectedScratchpad[CONFIGURATION] = RES_11_BIT;
- break;
- case 12:
- selectedScratchpad[CONFIGURATION] = RES_12_BIT;
- break;
- }
- if (resolution > globalResolution) {
- globalResolution = resolution;
- }
- writeScratchpad();
- }
- uint8_t DS18B20::getPowerMode() {
- return selectedPowerMode;
- }
- uint8_t DS18B20::getFamilyCode() {
- return selectedAddress[0];
- }
- void DS18B20::getAddress(uint8_t address[]) {
- memcpy(address, selectedAddress, 8);
- }
- void DS18B20::doConversion() {
- sendCommand(SKIP_ROM, CONVERT_T, !globalPowerMode);
- delayForConversion(globalResolution, globalPowerMode);
- }
- uint8_t DS18B20::getNumberOfDevices() {
- return numberOfDevices;
- }
- uint8_t DS18B20::hasAlarm() {
- uint8_t oldResolution = selectedResolution;
- setResolution(9);
- float temp = getTempC();
- setResolution(oldResolution);
- return ((temp <= selectedScratchpad[ALARM_LOW]) || (temp >= selectedScratchpad[ALARM_HIGH]));
- }
- void DS18B20::setAlarms(int8_t alarmLow, int8_t alarmHigh) {
- setAlarmLow(alarmLow);
- setAlarmHigh(alarmHigh);
- writeScratchpad();
- }
- int8_t DS18B20::getAlarmLow() {
- return selectedScratchpad[ALARM_LOW];
- }
- void DS18B20::setAlarmLow(int8_t alarmLow) {
- alarmLow = constrain(alarmLow, -55, 125);
- selectedScratchpad[ALARM_LOW] = alarmLow;
- writeScratchpad();
- }
- int8_t DS18B20::getAlarmHigh() {
- return selectedScratchpad[ALARM_HIGH];
- }
- void DS18B20::setAlarmHigh(int8_t alarmHigh) {
- alarmHigh = constrain(alarmHigh, -55, 125);
- selectedScratchpad[ALARM_HIGH] = alarmHigh;
- writeScratchpad();
- }
- void DS18B20::setRegisters(int8_t lowRegister, int8_t highRegister) {
- setAlarms(lowRegister, highRegister);
- }
- int8_t DS18B20::getLowRegister() {
- return getAlarmLow();
- }
- void DS18B20::setLowRegister(int8_t lowRegister) {
- setAlarmLow(lowRegister);
- }
- int8_t DS18B20::getHighRegister() {
- return getAlarmHigh();
- }
- void DS18B20::setHighRegister(int8_t highRegister) {
- setAlarmHigh(highRegister);
- }
- uint8_t DS18B20::readScratchpad() {
- sendCommand(MATCH_ROM, READ_SCRATCHPAD);
- for (uint8_t i = 0; i < SIZE_SCRATCHPAD; i++) {
- selectedScratchpad[i] = oneWire.read();
- }
- return OneWire::crc8(selectedScratchpad, 8) == selectedScratchpad[CRC8];
- }
- void DS18B20::writeScratchpad() {
- sendCommand(MATCH_ROM, WRITE_SCRATCHPAD);
- oneWire.write(selectedScratchpad[ALARM_HIGH]);
- oneWire.write(selectedScratchpad[ALARM_LOW]);
- oneWire.write(selectedScratchpad[CONFIGURATION]);
- sendCommand(MATCH_ROM, COPY_SCRATCHPAD, !selectedPowerMode);
- if (!selectedPowerMode) {
- delay(10);
- }
- }
- uint8_t DS18B20::sendCommand(uint8_t romCommand) {
- if (!oneWire.reset()) {
- return 0;
- }
- switch (romCommand) {
- case SEARCH_ROM:
- case SKIP_ROM:
- case ALARM_SEARCH:
- oneWire.write(romCommand);
- break;
- case MATCH_ROM:
- oneWire.select(selectedAddress);
- break;
- default:
- return 0;
- }
- return 1;
- }
- uint8_t DS18B20::sendCommand(uint8_t romCommand, uint8_t functionCommand, uint8_t power) {
- if (!sendCommand(romCommand)) {
- return 0;
- }
- switch (functionCommand) {
- case CONVERT_T:
- case COPY_SCRATCHPAD:
- oneWire.write(functionCommand, power);
- break;
- case WRITE_SCRATCHPAD:
- case READ_SCRATCHPAD:
- case READ_POWER_SUPPLY:
- oneWire.write(functionCommand);
- break;
- default:
- return 0;
- }
- return 1;
- }
- uint8_t DS18B20::oneWireSearch(uint8_t romCommand) {
- if (lastDevice || !sendCommand(romCommand)) {
- resetSearch();
- return 0;
- }
- uint8_t lastZero = 0;
- uint8_t direction, byteNumber, bitNumber, currentBit, currentBitComp;
- for (uint8_t bitPosition = 0; bitPosition < 64; bitPosition++) {
- currentBit = oneWire.read_bit();
- currentBitComp = oneWire.read_bit();
- if (currentBit && currentBitComp) {
- lastDiscrepancy = 0;
- return 0;
- }
- byteNumber = bitPosition / 8;
- bitNumber = bitPosition % 8;
- if (!currentBit && !currentBitComp) {
- if (bitPosition == lastDiscrepancy) {
- direction = 1;
- } else if (bitPosition > lastDiscrepancy) {
- direction = 0;
- lastZero = bitPosition;
- } else {
- direction = bitRead(searchAddress[byteNumber], bitNumber);
- if (!direction) {
- lastZero = bitPosition;
- }
- }
- } else {
- direction = currentBit;
- }
- bitWrite(searchAddress[byteNumber], bitNumber, direction);
- oneWire.write_bit(direction);
- }
- lastDiscrepancy = lastZero;
- if (!lastDiscrepancy) {
- lastDevice = 1;
- }
- return 1;
- }
- uint8_t DS18B20::isConnected(uint8_t address[]) {
- if (!sendCommand(SEARCH_ROM)) {
- return 0;
- }
- uint8_t currentBit, currentBitComp, byteNumber, bitNumber;
- for (uint8_t bitPosition = 0; bitPosition < 64; bitPosition++) {
- currentBit = oneWire.read_bit();
- currentBitComp = oneWire.read_bit();
- if (currentBit && currentBitComp) {
- return 0;
- }
- byteNumber = bitPosition / 8;
- bitNumber = bitPosition % 8;
- oneWire.write_bit(bitRead(address[byteNumber], bitNumber));
- }
- return 1;
- }
- void DS18B20::delayForConversion(uint8_t resolution, uint8_t powerMode) {
- if (powerMode) {
- while (!oneWire.read_bit());
- } else {
- switch (resolution) {
- case 9:
- delay(CONV_TIME_9_BIT);
- break;
- case 10:
- delay(CONV_TIME_10_BIT);
- break;
- case 11:
- delay(CONV_TIME_11_BIT);
- break;
- case 12:
- delay(CONV_TIME_12_BIT);
- break;
- }
- }
- }
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