/** Starts a temperature conversion.
*
* @param wait True if function should block until temperature is converted
* @return 0 if temperature has been converted; -1 if otherwise
*/
int DS18B20::startConversion(bool wait)
{
int result = 0;
if (TemperatureSensor::Unknown == _temperatureSensor)
{
// no conversion started before (first start)
// identify chip (DS18B20 or DS18S20)
result = readROM();
if (0 != result)
{
// could not identify chip
return result;
}
else
{
if (_romCode[0] == 0x28)
{
_temperatureSensor = TemperatureSensor::DS18B20Type;
}
else if (_romCode[0] == 0x10)
{
_temperatureSensor = TemperatureSensor::DS18S20Type;
}
}
}
result = reset();
if (0 == result)
{
writeByte(0xCC); // Skip ROM
writeByte(0x44); // Convert T
if (true == wait)
{
// wait until conversion is completed
result = busyWait();
}
_conversionStarted = true;
}
return result;
}
int main(int argc, char **argv) {
init_port();
init_state();
readROM("microwriter.rom");
return 0;
}