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Burst read for BME280, to reduce spurious spikes (#2809)

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Carlos Garcia Saura 2021-11-30 16:12:52 +01:00 committed by GitHub
parent 24dfecb6f0
commit cd018ad3a5
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 19 deletions
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33
esphome/components/bme280/bme280.cpp
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@ -33,6 +33,7 @@ static const uint8_t BME280_REGISTER_CONTROLHUMID = 0xF2;
static const uint8_t BME280_REGISTER_STATUS = 0xF3;
static const uint8_t BME280_REGISTER_CONTROL = 0xF4;
static const uint8_t BME280_REGISTER_CONFIG = 0xF5;
static const uint8_t BME280_REGISTER_MEASUREMENTS = 0xF7;
static const uint8_t BME280_REGISTER_PRESSUREDATA = 0xF7;
static const uint8_t BME280_REGISTER_TEMPDATA = 0xFA;
static const uint8_t BME280_REGISTER_HUMIDDATA = 0xFD;
@ -178,21 +179,27 @@ void BME280Component::update() {
return;
}
float meas_time = 1.5;
float meas_time = 1.5f;
meas_time += 2.3f * oversampling_to_time(this->temperature_oversampling_);
meas_time += 2.3f * oversampling_to_time(this->pressure_oversampling_) + 0.575f;
meas_time += 2.3f * oversampling_to_time(this->humidity_oversampling_) + 0.575f;
this->set_timeout("data", uint32_t(ceilf(meas_time)), [this]() {
uint8_t data[8];
if (!this->read_bytes(BME280_REGISTER_MEASUREMENTS, data, 8)) {
ESP_LOGW(TAG, "Error reading registers.");
this->status_set_warning();
return;
}
int32_t t_fine = 0;
float temperature = this->read_temperature_(&t_fine);
float temperature = this->read_temperature_(data, &t_fine);
if (std::isnan(temperature)) {
ESP_LOGW(TAG, "Invalid temperature, cannot read pressure & humidity values.");
this->status_set_warning();
return;
}
float pressure = this->read_pressure_(t_fine);
float humidity = this->read_humidity_(t_fine);
float pressure = this->read_pressure_(data, t_fine);
float humidity = this->read_humidity_(data, t_fine);
ESP_LOGD(TAG, "Got temperature=%.1f°C pressure=%.1fhPa humidity=%.1f%%", temperature, pressure, humidity);
if (this->temperature_sensor_ != nullptr)
@ -204,11 +211,8 @@ void BME280Component::update() {
this->status_clear_warning();
});
}
float BME280Component::read_temperature_(int32_t *t_fine) {
uint8_t data[3];
if (!this->read_bytes(BME280_REGISTER_TEMPDATA, data, 3))
return NAN;
int32_t adc = ((data[0] & 0xFF) << 16) | ((data[1] & 0xFF) << 8) | (data[2] & 0xFF);
float BME280Component::read_temperature_(const uint8_t *data, int32_t *t_fine) {
int32_t adc = ((data[3] & 0xFF) << 16) | ((data[4] & 0xFF) << 8) | (data[5] & 0xFF);
adc >>= 4;
if (adc == 0x80000)
// temperature was disabled
@ -226,10 +230,7 @@ float BME280Component::read_temperature_(int32_t *t_fine) {
return temperature / 100.0f;
}
float BME280Component::read_pressure_(int32_t t_fine) {
uint8_t data[3];
if (!this->read_bytes(BME280_REGISTER_PRESSUREDATA, data, 3))
return NAN;
float BME280Component::read_pressure_(const uint8_t *data, int32_t t_fine) {
int32_t adc = ((data[0] & 0xFF) << 16) | ((data[1] & 0xFF) << 8) | (data[2] & 0xFF);
adc >>= 4;
if (adc == 0x80000)
@ -265,9 +266,9 @@ float BME280Component::read_pressure_(int32_t t_fine) {
return (p / 256.0f) / 100.0f;
}
float BME280Component::read_humidity_(int32_t t_fine) {
uint16_t raw_adc;
if (!this->read_byte_16(BME280_REGISTER_HUMIDDATA, &raw_adc) || raw_adc == 0x8000)
float BME280Component::read_humidity_(const uint8_t *data, int32_t t_fine) {
uint16_t raw_adc = ((data[6] & 0xFF) << 8) | (data[7] & 0xFF);
if (raw_adc == 0x8000)
return NAN;
int32_t adc = raw_adc;

6
esphome/components/bme280/bme280.h
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@ -82,11 +82,11 @@ class BME280Component : public PollingComponent, public i2c::I2CDevice {
protected:
/// Read the temperature value and store the calculated ambient temperature in t_fine.
float read_temperature_(int32_t *t_fine);
float read_temperature_(const uint8_t *data, int32_t *t_fine);
/// Read the pressure value in hPa using the provided t_fine value.
float read_pressure_(int32_t t_fine);
float read_pressure_(const uint8_t *data, int32_t t_fine);
/// Read the humidity value in % using the provided t_fine value.
float read_humidity_(int32_t t_fine);
float read_humidity_(const uint8_t *data, int32_t t_fine);
uint8_t read_u8_(uint8_t a_register);
uint16_t read_u16_le_(uint8_t a_register);
int16_t read_s16_le_(uint8_t a_register);