mirror/DHT-sensor-library
1
0
Fork 0
mirror of https://github.com/adafruit/DHT-sensor-library.git synced 2023-10-23 22:20:38 +03:00
Code Issues Projects Releases Wiki Activity

Divisions turned into multiplications

Browse Source 
As correctly stated by Mausy5043, the division is quite slow in most
microcontrollers, so I have replaced them with multiplications.
This commit is contained in:
J.M. Dana 2015-10-06 23:42:19 +01:00
parent 5fb1668822
commit 5bc0a5c796
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
DHT.cpp
View File

@ -46,7 +46,7 @@ float DHT::readTemperature(bool S, bool force) {
f = data[2] & 0x7F;
f *= 256;
f += data[3];
f /= 10;
f *= 0.1;
if (data[2] & 0x80) {
f *= -1;
}
@ -60,11 +60,11 @@ float DHT::readTemperature(bool S, bool force) {
}
float DHT::convertCtoF(float c) {
return c * 9 / 5 + 32;
return c * 1.8 + 32;
}
float DHT::convertFtoC(float f) {
return (f - 32) * 5 / 9;
return (f - 32) * 0.55555;
}
float DHT::readHumidity(bool force) {
@ -79,7 +79,7 @@ float DHT::readHumidity(bool force) {
f = data[0];
f *= 256;
f += data[1];
f /= 10;
f *= 0.1;
break;
}
}
@ -194,11 +194,11 @@ boolean DHT::read(bool force) {
_lastresult = false;
return _lastresult;
}
data[i/8] <<= 1;
data[i * 0.125] <<= 1;
// Now compare the low and high cycle times to see if the bit is a 0 or 1.
if (highCycles > lowCycles) {
// High cycles are greater than 50us low cycle count, must be a 1.
data[i/8] |= 1;
data[i * 0.125] |= 1;
}
// Else high cycles are less than (or equal to, a weird case) the 50us low
// cycle count so this must be a zero. Nothing needs to be changed in the