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451 lines
16 KiB
451 lines
16 KiB
// -----------------------------------------------------------------------------
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// BME280/BMP280 Sensor over I2C
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// Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && BMX280_SUPPORT
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#pragma once
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#undef I2C_SUPPORT
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#define I2C_SUPPORT 1 // Explicitly request I2C support.
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#include "Arduino.h"
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#include "I2CSensor.h"
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#define BMX280_CHIP_BMP280 0x58
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#define BMX280_CHIP_BME280 0x60
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#define BMX280_REGISTER_DIG_T1 0x88
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#define BMX280_REGISTER_DIG_T2 0x8A
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#define BMX280_REGISTER_DIG_T3 0x8C
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#define BMX280_REGISTER_DIG_P1 0x8E
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#define BMX280_REGISTER_DIG_P2 0x90
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#define BMX280_REGISTER_DIG_P3 0x92
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#define BMX280_REGISTER_DIG_P4 0x94
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#define BMX280_REGISTER_DIG_P5 0x96
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#define BMX280_REGISTER_DIG_P6 0x98
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#define BMX280_REGISTER_DIG_P7 0x9A
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#define BMX280_REGISTER_DIG_P8 0x9C
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#define BMX280_REGISTER_DIG_P9 0x9E
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#define BMX280_REGISTER_DIG_H1 0xA1
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#define BMX280_REGISTER_DIG_H2 0xE1
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#define BMX280_REGISTER_DIG_H3 0xE3
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#define BMX280_REGISTER_DIG_H4 0xE4
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#define BMX280_REGISTER_DIG_H5 0xE5
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#define BMX280_REGISTER_DIG_H6 0xE7
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#define BMX280_REGISTER_CHIPID 0xD0
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#define BMX280_REGISTER_VERSION 0xD1
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#define BMX280_REGISTER_SOFTRESET 0xE0
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#define BMX280_REGISTER_CAL26 0xE1
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#define BMX280_REGISTER_CONTROLHUMID 0xF2
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#define BMX280_REGISTER_CONTROL 0xF4
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#define BMX280_REGISTER_CONFIG 0xF5
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#define BMX280_REGISTER_PRESSUREDATA 0xF7
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#define BMX280_REGISTER_TEMPDATA 0xFA
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#define BMX280_REGISTER_HUMIDDATA 0xFD
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class BMX280Sensor : public I2CSensor {
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public:
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static unsigned char addresses[2];
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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BMX280Sensor(): I2CSensor() {
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_sensor_id = SENSOR_BMX280_ID;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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// Initialization method, must be idempotent
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void begin() {
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if (!_dirty) return;
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_init();
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_dirty = !_ready;
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}
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// Descriptive name of the sensor
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String description() {
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char buffer[20];
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snprintf(buffer, sizeof(buffer), "%s @ I2C (0x%02X)", _chip == BMX280_CHIP_BME280 ? "BME280" : "BMP280", _address);
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return String(buffer);
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}
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// Type for slot # index
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unsigned char type(unsigned char index) {
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unsigned char i = 0;
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#if BMX280_TEMPERATURE > 0
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if (index == i++) return MAGNITUDE_TEMPERATURE;
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#endif
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#if BMX280_PRESSURE > 0
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if (index == i++) return MAGNITUDE_PRESSURE;
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#endif
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#if BMX280_HUMIDITY > 0
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if (_chip == BMX280_CHIP_BME280) {
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if (index == i) return MAGNITUDE_HUMIDITY;
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}
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#endif
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return MAGNITUDE_NONE;
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}
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// Number of decimals for a magnitude (or -1 for default)
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signed char decimals(unsigned char type) {
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// These numbers of decimals correspond to maximum sensor resolution settings
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switch (type) {
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case MAGNITUDE_TEMPERATURE: return 3;
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case MAGNITUDE_PRESSURE: return 4;
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case MAGNITUDE_HUMIDITY: return 2;
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}
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return -1;
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}
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// Pre-read hook (usually to populate registers with up-to-date data)
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virtual void pre() {
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if (_run_init) {
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i2cClearBus();
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_init();
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}
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if (_chip == 0) {
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_error = SENSOR_ERROR_UNKNOWN_ID;
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return;
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}
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_error = SENSOR_ERROR_OK;
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#if BMX280_MODE == 1
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_forceRead();
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#endif
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_error = _read();
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if (_error != SENSOR_ERROR_OK) {
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_run_init = true;
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}
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}
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// Current value for slot # index
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double value(unsigned char index) {
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unsigned char i = 0;
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#if BMX280_TEMPERATURE > 0
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if (index == i++) return _temperature;
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#endif
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#if BMX280_PRESSURE > 0
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if (index == i++) return _pressure / 100;
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#endif
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#if BMX280_HUMIDITY > 0
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if (_chip == BMX280_CHIP_BME280) {
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if (index == i) return _humidity;
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}
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#endif
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return 0;
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}
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// Load the configuration manifest
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static void manifest(JsonArray& sensors) {
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char buffer[10];
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JsonObject& sensor = sensors.createNestedObject();
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sensor["sensor_id"] = SENSOR_BMX280_ID;
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JsonArray& fields = sensor.createNestedArray("fields");
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{
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JsonObject& field = fields.createNestedObject();
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field["tag"] = UI_TAG_SELECT;
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field["name"] = "address";
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field["label"] = "Address";
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JsonArray& options = field.createNestedArray("options");
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{
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JsonObject& option = options.createNestedObject();
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option["name"] = "auto";
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option["value"] = 0;
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}
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for (unsigned char i=0; i< sizeof(BMX280Sensor::addresses); i++) {
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JsonObject& option = options.createNestedObject();
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snprintf(buffer, sizeof(buffer), "0x%02X", BMX280Sensor::addresses[i]);
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option["name"] = String(buffer);
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option["value"] = BMX280Sensor::addresses[i];
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}
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}
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};
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void getConfig(JsonObject& root) {
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root["sensor_id"] = _sensor_id;
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root["address"] = _address;
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};
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void setConfig(JsonObject& root) {
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if (root.containsKey("address")) setAddress(root["address"]);
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};
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protected:
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void _init() {
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// Make sure sensor had enough time to turn on. BMX280 requires 2ms to start up
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nice_delay(10);
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// No chip ID by default
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_chip = 0;
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// I2C auto-discover
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_address = _begin_i2c(_address, sizeof(BMX280Sensor::addresses), BMX280Sensor::addresses);
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if (_address == 0) return;
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// Check sensor correctly initialized
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_chip = i2c_read_uint8(_address, BMX280_REGISTER_CHIPID);
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if ((_chip != BMX280_CHIP_BME280) && (_chip != BMX280_CHIP_BMP280)) {
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_chip = 0;
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i2cReleaseLock(_address);
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_previous_address = 0;
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_error = SENSOR_ERROR_UNKNOWN_ID;
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// Setting _address to 0 forces auto-discover
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// This might be necessary at this stage if there is a
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// different sensor in the hardcoded address
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_address = 0;
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return;
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}
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_count = 0;
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#if BMX280_TEMPERATURE > 0
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++_count;
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#endif
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#if BMX280_PRESSURE > 0
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++_count;
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#endif
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#if BMX280_HUMIDITY > 0
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if (_chip == BMX280_CHIP_BME280) ++_count;
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#endif
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_readCoefficients();
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unsigned char data = 0;
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i2c_write_uint8(_address, BMX280_REGISTER_CONTROL, data);
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data = (BMX280_STANDBY << 0x5) & 0xE0;
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data |= (BMX280_FILTER << 0x02) & 0x1C;
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i2c_write_uint8(_address, BMX280_REGISTER_CONFIG, data);
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data = (BMX280_HUMIDITY) & 0x07;
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i2c_write_uint8(_address, BMX280_REGISTER_CONTROLHUMID, data);
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data = (BMX280_TEMPERATURE << 5) & 0xE0;
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data |= (BMX280_PRESSURE << 2) & 0x1C;
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data |= (BMX280_MODE) & 0x03;
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i2c_write_uint8(_address, BMX280_REGISTER_CONTROL, data);
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_measurement_delay = _measurementTime();
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_run_init = false;
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_ready = true;
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}
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void _readCoefficients() {
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_bmx280_calib.dig_T1 = i2c_read_uint16_le(_address, BMX280_REGISTER_DIG_T1);
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_bmx280_calib.dig_T2 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_T2);
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_bmx280_calib.dig_T3 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_T3);
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_bmx280_calib.dig_P1 = i2c_read_uint16_le(_address, BMX280_REGISTER_DIG_P1);
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_bmx280_calib.dig_P2 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P2);
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_bmx280_calib.dig_P3 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P3);
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_bmx280_calib.dig_P4 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P4);
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_bmx280_calib.dig_P5 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P5);
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_bmx280_calib.dig_P6 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P6);
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_bmx280_calib.dig_P7 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P7);
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_bmx280_calib.dig_P8 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P8);
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_bmx280_calib.dig_P9 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_P9);
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_bmx280_calib.dig_H1 = i2c_read_uint8(_address, BMX280_REGISTER_DIG_H1);
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_bmx280_calib.dig_H2 = i2c_read_int16_le(_address, BMX280_REGISTER_DIG_H2);
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_bmx280_calib.dig_H3 = i2c_read_uint8(_address, BMX280_REGISTER_DIG_H3);
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_bmx280_calib.dig_H4 = (i2c_read_uint8(_address, BMX280_REGISTER_DIG_H4) << 4) | (i2c_read_uint8(_address, BMX280_REGISTER_DIG_H4+1) & 0xF);
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_bmx280_calib.dig_H5 = (i2c_read_uint8(_address, BMX280_REGISTER_DIG_H5+1) << 4) | (i2c_read_uint8(_address, BMX280_REGISTER_DIG_H5) >> 4);
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_bmx280_calib.dig_H6 = (int8_t) i2c_read_uint8(_address, BMX280_REGISTER_DIG_H6);
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}
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unsigned long _measurementTime() {
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// Measurement Time (as per BMX280 datasheet section 9.1)
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// T_max(ms) = 1.25
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// + (2.3 * T_oversampling)
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// + (2.3 * P_oversampling + 0.575)
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// + (2.4 * H_oversampling + 0.575)
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// ~ 9.3ms for current settings
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double t = 1.25;
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#if BMX280_TEMPERATURE > 0
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t += (2.3 * BMX280_TEMPERATURE);
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#endif
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#if BMX280_PRESSURE > 0
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t += (2.3 * BMX280_PRESSURE + 0.575);
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#endif
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#if BMX280_HUMIDITY > 0
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if (_chip == BMX280_CHIP_BME280) {
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t += (2.4 * BMX280_HUMIDITY + 0.575);
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}
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#endif
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return round(t + 1); // round up
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}
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void _forceRead() {
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// We set the sensor in "forced mode" to force a reading.
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// After the reading the sensor will go back to sleep mode.
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uint8_t value = i2c_read_uint8(_address, BMX280_REGISTER_CONTROL);
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value = (value & 0xFC) + 0x01;
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i2c_write_uint8(_address, BMX280_REGISTER_CONTROL, value);
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nice_delay(_measurement_delay);
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}
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unsigned char _read() {
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#if BMX280_TEMPERATURE > 0
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int32_t adc_T = i2c_read_uint16(_address, BMX280_REGISTER_TEMPDATA);
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if (0xFFFF == adc_T) return SENSOR_ERROR_I2C;
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adc_T <<= 8;
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adc_T |= i2c_read_uint8(_address, BMX280_REGISTER_TEMPDATA+2);
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adc_T >>= 4;
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int32_t var1t = ((((adc_T>>3) -
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((int32_t)_bmx280_calib.dig_T1 <<1))) *
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((int32_t)_bmx280_calib.dig_T2)) >> 11;
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int32_t var2t = (((((adc_T>>4) -
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((int32_t)_bmx280_calib.dig_T1)) *
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((adc_T>>4) - ((int32_t)_bmx280_calib.dig_T1))) >> 12) *
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((int32_t)_bmx280_calib.dig_T3)) >> 14;
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int32_t t_fine = var1t + var2t;
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double T = (t_fine * 5 + 128) >> 8;
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_temperature = T / 100;
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#else
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int32_t t_fine = 102374; // ~20ºC
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#endif
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// -----------------------------------------------------------------
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#if BMX280_PRESSURE > 0
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int64_t var1, var2, p;
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int32_t adc_P = i2c_read_uint16(_address, BMX280_REGISTER_PRESSUREDATA);
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if (0xFFFF == adc_P) return SENSOR_ERROR_I2C;
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adc_P <<= 8;
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adc_P |= i2c_read_uint8(_address, BMX280_REGISTER_PRESSUREDATA+2);
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adc_P >>= 4;
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var1 = ((int64_t)t_fine) - 128000;
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var2 = var1 * var1 * (int64_t)_bmx280_calib.dig_P6;
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var2 = var2 + ((var1*(int64_t)_bmx280_calib.dig_P5)<<17);
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var2 = var2 + (((int64_t)_bmx280_calib.dig_P4)<<35);
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var1 = ((var1 * var1 * (int64_t)_bmx280_calib.dig_P3)>>8) +
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((var1 * (int64_t)_bmx280_calib.dig_P2)<<12);
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var1 = (((((int64_t)1)<<47)+var1))*((int64_t)_bmx280_calib.dig_P1)>>33;
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if (var1 == 0) return SENSOR_ERROR_I2C; // avoid exception caused by division by zero
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p = 1048576 - adc_P;
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p = (((p<<31) - var2)*3125) / var1;
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var1 = (((int64_t)_bmx280_calib.dig_P9) * (p>>13) * (p>>13)) >> 25;
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var2 = (((int64_t)_bmx280_calib.dig_P8) * p) >> 19;
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p = ((p + var1 + var2) >> 8) + (((int64_t)_bmx280_calib.dig_P7)<<4);
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_pressure = (double) p / 256;
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#endif
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// -----------------------------------------------------------------
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#if BMX280_HUMIDITY > 0
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if (_chip == BMX280_CHIP_BME280) {
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int32_t adc_H = i2c_read_uint16(_address, BMX280_REGISTER_HUMIDDATA);
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if (0xFFFF == adc_H) return SENSOR_ERROR_I2C;
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int32_t v_x1_u32r;
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v_x1_u32r = (t_fine - ((int32_t)76800));
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v_x1_u32r = (((((adc_H << 14) - (((int32_t)_bmx280_calib.dig_H4) << 20) -
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(((int32_t)_bmx280_calib.dig_H5) * v_x1_u32r)) + ((int32_t)16384)) >> 15) *
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(((((((v_x1_u32r * ((int32_t)_bmx280_calib.dig_H6)) >> 10) *
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(((v_x1_u32r * ((int32_t)_bmx280_calib.dig_H3)) >> 11) + ((int32_t)32768))) >> 10) +
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((int32_t)2097152)) * ((int32_t)_bmx280_calib.dig_H2) + 8192) >> 14));
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v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) *
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((int32_t)_bmx280_calib.dig_H1)) >> 4));
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v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r;
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v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r;
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double h = (v_x1_u32r >> 12);
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_humidity = h / 1024.0;
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}
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#endif
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return SENSOR_ERROR_OK;
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}
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// ---------------------------------------------------------------------
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unsigned char _chip;
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unsigned long _measurement_delay;
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bool _run_init = false;
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double _temperature = 0;
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double _pressure = 0;
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double _humidity = 0;
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typedef struct {
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uint16_t dig_T1;
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int16_t dig_T2;
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int16_t dig_T3;
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uint16_t dig_P1;
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int16_t dig_P2;
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int16_t dig_P3;
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int16_t dig_P4;
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int16_t dig_P5;
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int16_t dig_P6;
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int16_t dig_P7;
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int16_t dig_P8;
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int16_t dig_P9;
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uint8_t dig_H1;
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int16_t dig_H2;
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uint8_t dig_H3;
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int16_t dig_H4;
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int16_t dig_H5;
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int8_t dig_H6;
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} bmx280_calib_t;
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bmx280_calib_t _bmx280_calib;
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};
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// Static inizializations
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unsigned char BMX280Sensor::addresses[2] = {0x76, 0x77};
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#endif // SENSOR_SUPPORT && BMX280_SUPPORT
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