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#3358 Correct temperature validity detection issue in some conditions of pu… (#3545)

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Co-authored-by: Otto Winter <otto@otto-winter.com>
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Benoit3 2022-06-29 21:30:44 +02:00 committed by GitHub
parent 72cce391ab
commit 6f83a49c63
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 2 deletions
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19
esphome/components/dallas/dallas_component.cpp
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@ -134,7 +134,6 @@ void DallasComponent::update() {
return;
}
if (!sensor->check_scratch_pad()) {
ESP_LOGW(TAG, "'%s' - Scratch pad checksum invalid!", sensor->get_name().c_str());
sensor->publish_state(NAN);
this->status_set_warning();
return;
@ -241,13 +240,29 @@ bool DallasTemperatureSensor::setup_sensor() {
return true;
}
bool DallasTemperatureSensor::check_scratch_pad() {
bool chksum_validity = (crc8(this->scratch_pad_, 8) == this->scratch_pad_[8]);
bool config_validity = false;
switch (this->get_address8()[0]) {
case DALLAS_MODEL_DS18B20:
config_validity = ((this->scratch_pad_[4] & 0x9F) == 0x1F);
break;
default:
config_validity = ((this->scratch_pad_[4] & 0x10) == 0x10);
}
#ifdef ESPHOME_LOG_LEVEL_VERY_VERBOSE
ESP_LOGVV(TAG, "Scratch pad: %02X.%02X.%02X.%02X.%02X.%02X.%02X.%02X.%02X (%02X)", this->scratch_pad_[0],
this->scratch_pad_[1], this->scratch_pad_[2], this->scratch_pad_[3], this->scratch_pad_[4],
this->scratch_pad_[5], this->scratch_pad_[6], this->scratch_pad_[7], this->scratch_pad_[8],
crc8(this->scratch_pad_, 8));
#endif
return crc8(this->scratch_pad_, 8) == this->scratch_pad_[8];
if (!chksum_validity) {
ESP_LOGW(TAG, "'%s' - Scratch pad checksum invalid!", this->get_name().c_str());
} else if (!config_validity) {
ESP_LOGW(TAG, "'%s' - Scratch pad config register invalid!", this->get_name().c_str());
}
return chksum_validity && config_validity;
}
float DallasTemperatureSensor::get_temp_c() {
int16_t temp = (int16_t(this->scratch_pad_[1]) << 11) | (int16_t(this->scratch_pad_[0]) << 3);