I decided to build an air humidity alarm so I know when to air (you can also attach a piezo buzzer, which is more recognizable in some situations). I found/use this lib.
Chip: MSP430G2452 (this I had left, I think it's overkill for this task)
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Problem solved.
Thanks to all who helped.
To solve the problem I decided to comment out
if (millis() < _lastMillis) {
return _lastResult; // return last correct measurement
}
_lastMillis = millis() + 1;
in DHT22_430.cpp because I think the millis() doesn't run below LPM1. I also don't need the millis() because I already wait in interru