Ellipsoid::Ellipsoid(glm::dvec3 radii) : _radii(radii) {
updateInternalCache();
}
bool DHT::read(void)
{
uint8_t laststate = HIGH;
uint8_t counter = 0;
uint8_t j = 0, i;
unsigned long time = millis();
//Determine if it's appropiate to read the sensor, or return data from cache
if ((time - m_lastreadtime) < m_maxIntervalRead && (errDHT_OK == m_lastError))
{
return true; // will use last data from cache
}
m_lastreadtime = time;
//reset internal data and invalidate cache
m_data[0] = m_data[1] = m_data[2] = m_data[3] = m_data[4] = 0;
m_lastError = errDHT_Other;
m_lastTemp = NAN;
m_lastHumid = NAN;
//Pull the pin low for m_wakeupTimeMs milliseconds
pinMode(m_kSensorPin, OUTPUT);
digitalWrite(m_kSensorPin, LOW);
delay(m_wakeupTimeMs);
//clear interrupts
cli();
//Make pin input and activate pullup
pinMode(m_kSensorPin, INPUT);
if (m_bPullupEnabled)
{
pullup(m_kSensorPin);
}
else
{
digitalWrite(m_kSensorPin, HIGH);
}
//Read in the transitions
for (i = 0; i < MAXTIMINGS || j >= 40; i++)
{
counter = 0;
while (digitalRead(m_kSensorPin) == laststate)
{
counter++;
delayMicroseconds(1);
if (counter == 255)
{
break;
}
}
laststate = digitalRead(m_kSensorPin);
if (counter == 255)
{
m_lastError = errDHT_Timeout;
break;
}
// ignore first 3 transitions
if ((i >= 4) && (i % 2 == 0))
{
// shove each bit into the storage bytes
m_data[j / 8] <<= 1;
if (counter > ONE_DURATION_THRESH_US)
{
m_data[j / 8] |= 1;
}
j++;
}
}
sei();
#if DHT_DEBUG
Serial.println(j, DEC);
Serial.print(m_data[0], HEX); Serial.print(", ");
Serial.print(m_data[1], HEX); Serial.print(", ");
Serial.print(m_data[2], HEX); Serial.print(", ");
Serial.print(m_data[3], HEX); Serial.print(", ");
Serial.print(m_data[4], HEX); Serial.print(" =? ");
Serial.println((m_data[0] + m_data[1] + m_data[2] + m_data[3]) & 0xFF, HEX);
#endif
// pull the pin high at the end
//(will stay high at least 250ms until the next reading)
pinMode(m_kSensorPin, OUTPUT);
digitalWrite(m_kSensorPin, HIGH);
// check we read 40 bits and that the checksum matches
if ((j >= 40) &&
(m_data[4] == ((m_data[0] + m_data[1] + m_data[2] + m_data[3]) & 0xFF)))
{
updateInternalCache();
m_lastError = errDHT_OK;
return true;
}
else
{
m_lastError = errDHT_Checksum;
}
return false;
}
