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make neg temp compliant with 2's comp variant

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jeanmichel_nwsb 2021-12-27 16:33:44 +01:00
parent cb52c4cf35
commit 2e19f66749
1 changed files with 4 additions and 5 deletions
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9
tasmota/xsns_06_dht.ino
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@ -152,11 +152,10 @@ bool DhtRead(uint32_t sensor) {
case GPIO_SI7021: // iTead SI7021
humidity = ((dht_data[0] << 8) | dht_data[1]) * 0.1;
// DHT21/22 (Adafruit):
temperature = ((int16_t)(dht_data[2] & 0x7F) << 8 ) | dht_data[3];
temperature *= 0.1f;
if (dht_data[2] & 0x80) {
temperature *= -1;
}
int16_t temp16 = dht_data[2] << 8 | dht_data[3]; // case 1 : signed 16 bits
if ((dht_data[2] & 0xF0) == 0x80) // case 2 : negative when high nibble = 0x80
temp16 = -(0xFFF & temp16);
temperature = 0.1f * temp16;
break;
}
if (isnan(temperature) || isnan(humidity)) {