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[dallas_temp] fix ds18s20 temp calc (#6988)

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Samuel Sieb 2024-06-26 00:27:07 -07:00 committed by GitHub
parent cc4f1c667e
commit 91766afb64
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GPG key ID: B5690EEEBB952194
1 changed files with 15 additions and 18 deletions
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33
esphome/components/dallas_temp/dallas_temp.cpp
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@ -145,24 +145,21 @@ bool DallasTemperatureSensor::check_scratch_pad_() {
float DallasTemperatureSensor::get_temp_c_() { float DallasTemperatureSensor::get_temp_c_() {
int16_t temp = (this->scratch_pad_[1] << 8) | this->scratch_pad_[0]; int16_t temp = (this->scratch_pad_[1] << 8) | this->scratch_pad_[0];
if ((this->address_ & 0xff) == DALLAS_MODEL_DS18S20) { if ((this->address_ & 0xff) == DALLAS_MODEL_DS18S20) {
if (this->scratch_pad_[7] != 0x10) return (temp >> 1) + (this->scratch_pad_[7] - this->scratch_pad_[6]) / float(this->scratch_pad_[7]) - 0.25;
ESP_LOGE(TAG, "unexpected COUNT_PER_C value: %u", this->scratch_pad_[7]); }
temp = ((temp & 0xfff7) << 3) + (0x10 - this->scratch_pad_[6]) - 4; switch (this->resolution_) {
} else { case 9:
switch (this->resolution_) { temp &= 0xfff8;
case 9: break;
temp &= 0xfff8; case 10:
break; temp &= 0xfffc;
case 10: break;
temp &= 0xfffc; case 11:
break; temp &= 0xfffe;
case 11: break;
temp &= 0xfffe; case 12:
break; default:
case 12: break;
default:
break;
}
} }
return temp / 16.0f; return temp / 16.0f;