bool DallasTemperature::isConversionAvailable(const uint8_t* deviceAddress)
{
// Check if the clock has been raised indicating the conversion is complete
ScratchPad scratchPad;
readScratchPad(deviceAddress, scratchPad);
return scratchPad[0];
}
void DallasTemperature::begin(void) {
DeviceAddress deviceAddress;
_wire->reset_search();
devices = 0; // Reset the number of devices when we enumerate wire devices
while (_wire->search(deviceAddress)) {
if (validAddress(deviceAddress)) {
#if REQUIRESPARASITEPOWERAVAILABLE
if (!parasite && readPowerSupply(deviceAddress)) parasite = true;
#endif
ScratchPad scratchPad;
readScratchPad(deviceAddress, scratchPad);
#if REQUIRESONLY12BITCONVERSION
setResolution(deviceAddress, 12);
#else
//bitResolution = max(bitResolution, getResolution(deviceAddress));
uint8_t newResolution = getResolution(deviceAddress);
if (newResolution > bitResolution) { // the max macro may call getResultion multiple times.
bitResolution = newResolution;
}
#endif
devices++;
}
}
}
bool DallasTemperature::readScratchPadCRC(const uint8_t* deviceAddress, uint8_t* scratchPad) {
for (uint8_t i = 0; i < DALLAS_CRC_RETRIES; i++) {
readScratchPad(deviceAddress, scratchPad);
bool crcMatch = _wire->crc8(scratchPad, 8) == scratchPad[SCRATCHPAD_CRC];
if (crcMatch) {
return true;
}
}
return false;
}
// returns the current resolution, 9-12
uint8_t DallasTemperature::getResolution(uint8_t* deviceAddress)
{
if (deviceAddress[0] == DS18S20MODEL) return 9; // this model has a fixed resolution
ScratchPad scratchPad;
readScratchPad(deviceAddress, scratchPad);
switch (scratchPad[CONFIGURATION])
{
case TEMP_12_BIT:
return 12;
break;
case TEMP_11_BIT:
return 11;
break;
case TEMP_10_BIT:
return 10;
break;
case TEMP_9_BIT:
return 9;
break;
}
}
// initialize the bus
void DallasTemperature::begin(void)
{
DeviceAddress deviceAddress;
_wire->reset_search();
devices = 0; // Reset the number of devices when we enumerate wire devices
while (_wire->search(deviceAddress))
{
if (validAddress(deviceAddress))
{
if (!parasite && readPowerSupply(deviceAddress)) parasite = true;
ScratchPad scratchPad;
readScratchPad(deviceAddress, scratchPad);
bitResolution = max(bitResolution, getResolution(deviceAddress));
devices++;
}
}
}
// initialize the bus
void DallasTemperature::begin(void)
{
DeviceAddress deviceAddress;
_wire->reset_search();
while (_wire->search(deviceAddress))
{
if (validAddress(deviceAddress))
{
if (!parasite && readPowerSupply(deviceAddress)) parasite = true;
ScratchPad scratchPad;
readScratchPad(deviceAddress, scratchPad);
if (deviceAddress[0] == DS18S20MODEL) conversionDelay = TEMP_12_BIT; // 750 ms
else if (scratchPad[CONFIGURATION] > conversionDelay) conversionDelay = scratchPad[CONFIGURATION];
devices++;
}
}
}
// attempt to determine if the device at the given address is connected to the bus
// also allows for updating the read scratchpad
bool DallasTemperature::isConnected(uint8_t* deviceAddress, uint8_t* scratchPad)
{
readScratchPad(deviceAddress, scratchPad);
return (_wire->crc8(scratchPad, 8) == scratchPad[SCRATCHPAD_CRC]);
}