ESPHome  2024.11.1
bmp280_base.cpp
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1 #include "bmp280_base.h"
2 #include "esphome/core/hal.h"
3 #include "esphome/core/log.h"
4 
5 namespace esphome {
6 namespace bmp280_base {
7 
8 static const char *const TAG = "bmp280.sensor";
9 
10 static const uint8_t BMP280_REGISTER_STATUS = 0xF3;
11 static const uint8_t BMP280_REGISTER_CONTROL = 0xF4;
12 static const uint8_t BMP280_REGISTER_CONFIG = 0xF5;
13 static const uint8_t BMP280_REGISTER_PRESSUREDATA = 0xF7;
14 static const uint8_t BMP280_REGISTER_TEMPDATA = 0xFA;
15 static const uint8_t BMP280_REGISTER_RESET = 0xE0;
16 
17 static const uint8_t BMP280_MODE_FORCED = 0b01;
18 static const uint8_t BMP280_SOFT_RESET = 0xB6;
19 static const uint8_t BMP280_STATUS_IM_UPDATE = 0b01;
20 
21 inline uint16_t combine_bytes(uint8_t msb, uint8_t lsb) { return ((msb & 0xFF) << 8) | (lsb & 0xFF); }
22 
23 static const char *oversampling_to_str(BMP280Oversampling oversampling) {
24  switch (oversampling) {
26  return "None";
28  return "1x";
30  return "2x";
32  return "4x";
34  return "8x";
36  return "16x";
37  default:
38  return "UNKNOWN";
39  }
40 }
41 
42 static const char *iir_filter_to_str(BMP280IIRFilter filter) {
43  switch (filter) {
45  return "OFF";
47  return "2x";
49  return "4x";
51  return "8x";
53  return "16x";
54  default:
55  return "UNKNOWN";
56  }
57 }
58 
60  ESP_LOGCONFIG(TAG, "Setting up BMP280...");
61  uint8_t chip_id = 0;
62 
63  // Read the chip id twice, to work around a bug where the first read is 0.
64  // https://community.st.com/t5/stm32-mcus-products/issue-with-reading-bmp280-chip-id-using-spi/td-p/691855
65  if (!this->read_byte(0xD0, &chip_id)) {
66  this->error_code_ = COMMUNICATION_FAILED;
67  this->mark_failed();
68  return;
69  }
70  if (!this->read_byte(0xD0, &chip_id)) {
71  this->error_code_ = COMMUNICATION_FAILED;
72  this->mark_failed();
73  return;
74  }
75  if (chip_id != 0x58) {
76  this->error_code_ = WRONG_CHIP_ID;
77  this->mark_failed();
78  return;
79  }
80 
81  // Send a soft reset.
82  if (!this->write_byte(BMP280_REGISTER_RESET, BMP280_SOFT_RESET)) {
83  this->mark_failed();
84  return;
85  }
86  // Wait until the NVM data has finished loading.
87  uint8_t status;
88  uint8_t retry = 5;
89  do {
90  delay(2);
91  if (!this->read_byte(BMP280_REGISTER_STATUS, &status)) {
92  ESP_LOGW(TAG, "Error reading status register.");
93  this->mark_failed();
94  return;
95  }
96  } while ((status & BMP280_STATUS_IM_UPDATE) && (--retry));
97  if (status & BMP280_STATUS_IM_UPDATE) {
98  ESP_LOGW(TAG, "Timeout loading NVM.");
99  this->mark_failed();
100  return;
101  }
102 
103  // Read calibration
104  this->calibration_.t1 = this->read_u16_le_(0x88);
105  this->calibration_.t2 = this->read_s16_le_(0x8A);
106  this->calibration_.t3 = this->read_s16_le_(0x8C);
107 
108  this->calibration_.p1 = this->read_u16_le_(0x8E);
109  this->calibration_.p2 = this->read_s16_le_(0x90);
110  this->calibration_.p3 = this->read_s16_le_(0x92);
111  this->calibration_.p4 = this->read_s16_le_(0x94);
112  this->calibration_.p5 = this->read_s16_le_(0x96);
113  this->calibration_.p6 = this->read_s16_le_(0x98);
114  this->calibration_.p7 = this->read_s16_le_(0x9A);
115  this->calibration_.p8 = this->read_s16_le_(0x9C);
116  this->calibration_.p9 = this->read_s16_le_(0x9E);
117 
118  uint8_t config_register = 0;
119  if (!this->read_byte(BMP280_REGISTER_CONFIG, &config_register)) {
120  this->mark_failed();
121  return;
122  }
123  config_register &= ~0b11111100;
124  config_register |= 0b000 << 5; // 0.5 ms standby time
125  config_register |= (this->iir_filter_ & 0b111) << 2;
126  if (!this->write_byte(BMP280_REGISTER_CONFIG, config_register)) {
127  this->mark_failed();
128  return;
129  }
130 }
132  ESP_LOGCONFIG(TAG, "BMP280:");
133  switch (this->error_code_) {
135  ESP_LOGE(TAG, "Communication with BMP280 failed!");
136  break;
137  case WRONG_CHIP_ID:
138  ESP_LOGE(TAG, "BMP280 has wrong chip ID! Is it a BME280?");
139  break;
140  case NONE:
141  default:
142  break;
143  }
144  ESP_LOGCONFIG(TAG, " IIR Filter: %s", iir_filter_to_str(this->iir_filter_));
145  LOG_UPDATE_INTERVAL(this);
146 
147  LOG_SENSOR(" ", "Temperature", this->temperature_sensor_);
148  ESP_LOGCONFIG(TAG, " Oversampling: %s", oversampling_to_str(this->temperature_oversampling_));
149  LOG_SENSOR(" ", "Pressure", this->pressure_sensor_);
150  ESP_LOGCONFIG(TAG, " Oversampling: %s", oversampling_to_str(this->pressure_oversampling_));
151 }
153 
154 inline uint8_t oversampling_to_time(BMP280Oversampling over_sampling) { return (1 << uint8_t(over_sampling)) >> 1; }
155 
157  // Enable sensor
158  ESP_LOGV(TAG, "Sending conversion request...");
159  uint8_t meas_value = 0;
160  meas_value |= (this->temperature_oversampling_ & 0b111) << 5;
161  meas_value |= (this->pressure_oversampling_ & 0b111) << 2;
162  meas_value |= 0b01; // Forced mode
163  if (!this->write_byte(BMP280_REGISTER_CONTROL, meas_value)) {
164  this->status_set_warning();
165  return;
166  }
167 
168  float meas_time = 1;
169  meas_time += 2.3f * oversampling_to_time(this->temperature_oversampling_);
170  meas_time += 2.3f * oversampling_to_time(this->pressure_oversampling_) + 0.575f;
171 
172  this->set_timeout("data", uint32_t(ceilf(meas_time)), [this]() {
173  int32_t t_fine = 0;
174  float temperature = this->read_temperature_(&t_fine);
175  if (std::isnan(temperature)) {
176  ESP_LOGW(TAG, "Invalid temperature, cannot read pressure values.");
177  this->status_set_warning();
178  return;
179  }
180  float pressure = this->read_pressure_(t_fine);
181 
182  ESP_LOGD(TAG, "Got temperature=%.1f°C pressure=%.1fhPa", temperature, pressure);
183  if (this->temperature_sensor_ != nullptr)
184  this->temperature_sensor_->publish_state(temperature);
185  if (this->pressure_sensor_ != nullptr)
186  this->pressure_sensor_->publish_state(pressure);
187  this->status_clear_warning();
188  });
189 }
190 
191 float BMP280Component::read_temperature_(int32_t *t_fine) {
192  uint8_t data[3];
193  if (!this->read_bytes(BMP280_REGISTER_TEMPDATA, data, 3))
194  return NAN;
195  int32_t adc = ((data[0] & 0xFF) << 16) | ((data[1] & 0xFF) << 8) | (data[2] & 0xFF);
196  adc >>= 4;
197  if (adc == 0x80000) {
198  // temperature was disabled
199  return NAN;
200  }
201 
202  const int32_t t1 = this->calibration_.t1;
203  const int32_t t2 = this->calibration_.t2;
204  const int32_t t3 = this->calibration_.t3;
205 
206  int32_t var1 = (((adc >> 3) - (t1 << 1)) * t2) >> 11;
207  int32_t var2 = (((((adc >> 4) - t1) * ((adc >> 4) - t1)) >> 12) * t3) >> 14;
208  *t_fine = var1 + var2;
209 
210  float temperature = (*t_fine * 5 + 128);
211  return temperature / 25600.0f;
212 }
213 
214 float BMP280Component::read_pressure_(int32_t t_fine) {
215  uint8_t data[3];
216  if (!this->read_bytes(BMP280_REGISTER_PRESSUREDATA, data, 3))
217  return NAN;
218  int32_t adc = ((data[0] & 0xFF) << 16) | ((data[1] & 0xFF) << 8) | (data[2] & 0xFF);
219  adc >>= 4;
220  if (adc == 0x80000) {
221  // pressure was disabled
222  return NAN;
223  }
224  const int64_t p1 = this->calibration_.p1;
225  const int64_t p2 = this->calibration_.p2;
226  const int64_t p3 = this->calibration_.p3;
227  const int64_t p4 = this->calibration_.p4;
228  const int64_t p5 = this->calibration_.p5;
229  const int64_t p6 = this->calibration_.p6;
230  const int64_t p7 = this->calibration_.p7;
231  const int64_t p8 = this->calibration_.p8;
232  const int64_t p9 = this->calibration_.p9;
233 
234  int64_t var1, var2, p;
235  var1 = int64_t(t_fine) - 128000;
236  var2 = var1 * var1 * p6;
237  var2 = var2 + ((var1 * p5) << 17);
238  var2 = var2 + (p4 << 35);
239  var1 = ((var1 * var1 * p3) >> 8) + ((var1 * p2) << 12);
240  var1 = ((int64_t(1) << 47) + var1) * p1 >> 33;
241 
242  if (var1 == 0)
243  return NAN;
244 
245  p = 1048576 - adc;
246  p = (((p << 31) - var2) * 3125) / var1;
247  var1 = (p9 * (p >> 13) * (p >> 13)) >> 25;
248  var2 = (p8 * p) >> 19;
249 
250  p = ((p + var1 + var2) >> 8) + (p7 << 4);
251  return (p / 256.0f) / 100.0f;
252 }
254  this->temperature_oversampling_ = temperature_over_sampling;
255 }
257  this->pressure_oversampling_ = pressure_over_sampling;
258 }
259 void BMP280Component::set_iir_filter(BMP280IIRFilter iir_filter) { this->iir_filter_ = iir_filter; }
260 uint8_t BMP280Component::read_u8_(uint8_t a_register) {
261  uint8_t data = 0;
262  this->read_byte(a_register, &data);
263  return data;
264 }
265 uint16_t BMP280Component::read_u16_le_(uint8_t a_register) {
266  uint16_t data = 0;
267  this->read_byte_16(a_register, &data);
268  return (data >> 8) | (data << 8);
269 }
270 int16_t BMP280Component::read_s16_le_(uint8_t a_register) { return this->read_u16_le_(a_register); }
271 
272 } // namespace bmp280_base
273 } // namespace esphome
BMP280Oversampling temperature_oversampling_
Definition: bmp280_base.h:85
const float DATA
For components that import data from directly connected sensors like DHT.
Definition: component.cpp:19
virtual bool read_byte_16(uint8_t a_register, uint16_t *data)=0
void status_set_warning(const char *message="unspecified")
Definition: component.cpp:151
uint8_t pressure
Definition: tt21100.cpp:19
BMP280Oversampling
Enum listing all Oversampling values for the BMP280.
Definition: bmp280_base.h:31
void set_timeout(const std::string &name, uint32_t timeout, std::function< void()> &&f)
Set a timeout function with a unique name.
Definition: component.cpp:69
void set_pressure_oversampling(BMP280Oversampling pressure_over_sampling)
Set the oversampling value for the pressure sensor. Default is 16x.
uint16_t read_u16_le_(uint8_t a_register)
enum esphome::bmp280_base::BMP280Component::ErrorCode NONE
virtual bool write_byte(uint8_t a_register, uint8_t data)=0
BMP280CalibrationData calibration_
Definition: bmp280_base.h:84
virtual bool read_bytes(uint8_t a_register, uint8_t *data, size_t len)=0
virtual bool read_byte(uint8_t a_register, uint8_t *data)=0
uint8_t read_u8_(uint8_t a_register)
float read_temperature_(int32_t *t_fine)
Read the temperature value and store the calculated ambient temperature in t_fine.
BMP280Oversampling pressure_oversampling_
Definition: bmp280_base.h:86
BMP280IIRFilter
Enum listing all Infinite Impulse Filter values for the BMP280.
Definition: bmp280_base.h:44
void status_clear_warning()
Definition: component.cpp:166
void set_temperature_oversampling(BMP280Oversampling temperature_over_sampling)
Set the oversampling value for the temperature sensor. Default is 16x.
void publish_state(float state)
Publish a new state to the front-end.
Definition: sensor.cpp:39
uint16_t temperature
Definition: sun_gtil2.cpp:26
uint16_t combine_bytes(uint8_t msb, uint8_t lsb)
Definition: bmp280_base.cpp:21
uint8_t oversampling_to_time(BMP280Oversampling over_sampling)
int16_t read_s16_le_(uint8_t a_register)
float get_setup_priority() const override
uint8_t status
Definition: bl0942.h:74
void set_iir_filter(BMP280IIRFilter iir_filter)
Set the IIR Filter used to increase accuracy, defaults to no IIR Filter.
virtual void mark_failed()
Mark this component as failed.
Definition: component.cpp:118
Implementation of SPI Controller mode.
Definition: a01nyub.cpp:7
float read_pressure_(int32_t t_fine)
Read the pressure value in hPa using the provided t_fine value.
void IRAM_ATTR HOT delay(uint32_t ms)
Definition: core.cpp:26