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Tasmota/sonoff/xsns_09_bmp.ino

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/*
xsns_09_bmp.ino - BMP pressure, temperature and humidity sensor support for Sonoff-Tasmota
Copyright (C) 2017 Heiko Krupp and Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_I2C
#ifdef USE_BMP
/*********************************************************************************************\
* BMP085, BMP180, BMP280, BME280 - Pressure and Temperature and Humidy (BME280 only)
*
* Source: Heiko Krupp and Adafruit Industries
\*********************************************************************************************/
#define BMP_ADDR 0x77
#define BMP180_CHIPID 0x55
#define BMP280_CHIPID 0x58
#define BME280_CHIPID 0x60
#define BMP_REGISTER_CHIPID 0xD0
double bmp_sealevel = 0.0;
uint8_t bmp_address;
uint8_t bmp_type = 0;
char bmp_types[7];
/*********************************************************************************************\
* BMP085 and BME180
\*********************************************************************************************/
#define BMP180_REG_CONTROL 0xF4
#define BMP180_REG_RESULT 0xF6
#define BMP180_TEMPERATURE 0x2E
#define BMP180_PRESSURE3 0xF4 // Max. oversampling -> OSS = 3
#define BMP180_AC1 0xAA
#define BMP180_AC2 0xAC
#define BMP180_AC3 0xAE
#define BMP180_AC4 0xB0
#define BMP180_AC5 0xB2
#define BMP180_AC6 0xB4
#define BMP180_VB1 0xB6
#define BMP180_VB2 0xB8
#define BMP180_MB 0xBA
#define BMP180_MC 0xBC
#define BMP180_MD 0xBE
#define BMP180_OSS 3
int16_t cal_ac1;
int16_t cal_ac2;
int16_t cal_ac3;
int16_t cal_b1;
int16_t cal_b2;
int16_t cal_mc;
int16_t cal_md;
uint16_t cal_ac4;
uint16_t cal_ac5;
uint16_t cal_ac6;
int32_t bmp180_b5 = 0;
boolean Bmp180Calibration()
{
cal_ac1 = I2cRead16(bmp_address, BMP180_AC1);
cal_ac2 = I2cRead16(bmp_address, BMP180_AC2);
cal_ac3 = I2cRead16(bmp_address, BMP180_AC3);
cal_ac4 = I2cRead16(bmp_address, BMP180_AC4);
cal_ac5 = I2cRead16(bmp_address, BMP180_AC5);
cal_ac6 = I2cRead16(bmp_address, BMP180_AC6);
cal_b1 = I2cRead16(bmp_address, BMP180_VB1);
cal_b2 = I2cRead16(bmp_address, BMP180_VB2);
cal_mc = I2cRead16(bmp_address, BMP180_MC);
cal_md = I2cRead16(bmp_address, BMP180_MD);
// Check for Errors in calibration data. Value never is 0x0000 or 0xFFFF
if (!cal_ac1 | !cal_ac2 | !cal_ac3 | !cal_ac4 | !cal_ac5 | !cal_ac6 | !cal_b1 | !cal_b2 | !cal_mc | !cal_md) {
return false;
}
if ((cal_ac1 == 0xFFFF) |
(cal_ac2 == 0xFFFF) |
(cal_ac3 == 0xFFFF) |
(cal_ac4 == 0xFFFF) |
(cal_ac5 == 0xFFFF) |
(cal_ac6 == 0xFFFF) |
(cal_b1 == 0xFFFF) |
(cal_b2 == 0xFFFF) |
(cal_mc == 0xFFFF) |
(cal_md == 0xFFFF)) {
return false;
}
return true;
}
double Bmp180ReadTemperature()
{
I2cWrite8(bmp_address, BMP180_REG_CONTROL, BMP180_TEMPERATURE);
delay(5); // 5ms conversion time
int ut = I2cRead16(bmp_address, BMP180_REG_RESULT);
int32_t x1 = (ut - (int32_t)cal_ac6) * ((int32_t)cal_ac5) >> 15;
int32_t x2 = ((int32_t)cal_mc << 11) / (x1 + (int32_t)cal_md);
bmp180_b5 = x1 + x2;
return ((bmp180_b5 + 8) >> 4) / 10.0;
}
double Bmp180ReadPressure()
{
int32_t p;
uint8_t msb;
uint8_t lsb;
uint8_t xlsb;
I2cWrite8(bmp_address, BMP180_REG_CONTROL, BMP180_PRESSURE3); // Highest resolution
delay(2 + (4 << BMP180_OSS)); // 26ms conversion time at ultra high resolution
uint32_t up = I2cRead24(bmp_address, BMP180_REG_RESULT);
up >>= (8 - BMP180_OSS);
int32_t b6 = bmp180_b5 - 4000;
int32_t x1 = ((int32_t)cal_b2 * ((b6 * b6) >> 12)) >> 11;
int32_t x2 = ((int32_t)cal_ac2 * b6) >> 11;
int32_t x3 = x1 + x2;
int32_t b3 = ((((int32_t)cal_ac1 * 4 + x3) << BMP180_OSS) + 2) >> 2;
x1 = ((int32_t)cal_ac3 * b6) >> 13;
x2 = ((int32_t)cal_b1 * ((b6 * b6) >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
uint32_t b4 = ((uint32_t)cal_ac4 * (uint32_t)(x3 + 32768)) >> 15;
uint32_t b7 = ((uint32_t)up - b3) * (uint32_t)(50000UL >> BMP180_OSS);
if (b7 < 0x80000000) {
p = (b7 * 2) / b4;
}
else {
p = (b7 / b4) * 2;
}
x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
p += ((x1 + x2 + (int32_t)3791) >> 4);
return p / 100.0; // convert to mbar
}
/*********************************************************************************************\
* BMP280 and BME280
*
* Programmer : BMP280/BME280 Datasheet and Adafruit with changes by Theo Arends
\*********************************************************************************************/
#define BME280_REGISTER_CONTROLHUMID 0xF2
#define BME280_REGISTER_CONTROL 0xF4
#define BME280_REGISTER_PRESSUREDATA 0xF7
#define BME280_REGISTER_TEMPDATA 0xFA
#define BME280_REGISTER_HUMIDDATA 0xFD
#define BME280_REGISTER_DIG_T1 0x88
#define BME280_REGISTER_DIG_T2 0x8A
#define BME280_REGISTER_DIG_T3 0x8C
#define BME280_REGISTER_DIG_P1 0x8E
#define BME280_REGISTER_DIG_P2 0x90
#define BME280_REGISTER_DIG_P3 0x92
#define BME280_REGISTER_DIG_P4 0x94
#define BME280_REGISTER_DIG_P5 0x96
#define BME280_REGISTER_DIG_P6 0x98
#define BME280_REGISTER_DIG_P7 0x9A
#define BME280_REGISTER_DIG_P8 0x9C
#define BME280_REGISTER_DIG_P9 0x9E
#define BME280_REGISTER_DIG_H1 0xA1
#define BME280_REGISTER_DIG_H2 0xE1
#define BME280_REGISTER_DIG_H3 0xE3
#define BME280_REGISTER_DIG_H4 0xE4
#define BME280_REGISTER_DIG_H5 0xE5
#define BME280_REGISTER_DIG_H6 0xE7
struct BME280CALIBDATA
{
uint16_t dig_T1;
int16_t dig_T2;
int16_t dig_T3;
uint16_t dig_P1;
int16_t dig_P2;
int16_t dig_P3;
int16_t dig_P4;
int16_t dig_P5;
int16_t dig_P6;
int16_t dig_P7;
int16_t dig_P8;
int16_t dig_P9;
uint8_t dig_H1;
int16_t dig_H2;
uint8_t dig_H3;
int16_t dig_H4;
int16_t dig_H5;
int8_t dig_H6;
} Bme280CalibrationData;
int32_t t_fine;
boolean Bmx280Calibrate()
{
// if (I2cRead8(bmp_address, BMP_REGISTER_CHIPID) != BME280_CHIPID) return false;
Bme280CalibrationData.dig_T1 = I2cRead16LE(bmp_address, BME280_REGISTER_DIG_T1);
Bme280CalibrationData.dig_T2 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_T2);
Bme280CalibrationData.dig_T3 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_T3);
Bme280CalibrationData.dig_P1 = I2cRead16LE(bmp_address, BME280_REGISTER_DIG_P1);
Bme280CalibrationData.dig_P2 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P2);
Bme280CalibrationData.dig_P3 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P3);
Bme280CalibrationData.dig_P4 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P4);
Bme280CalibrationData.dig_P5 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P5);
Bme280CalibrationData.dig_P6 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P6);
Bme280CalibrationData.dig_P7 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P7);
Bme280CalibrationData.dig_P8 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P8);
Bme280CalibrationData.dig_P9 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_P9);
if (BME280_CHIPID == bmp_type) {
Bme280CalibrationData.dig_H1 = I2cRead8(bmp_address, BME280_REGISTER_DIG_H1);
Bme280CalibrationData.dig_H2 = I2cReadS16_LE(bmp_address, BME280_REGISTER_DIG_H2);
Bme280CalibrationData.dig_H3 = I2cRead8(bmp_address, BME280_REGISTER_DIG_H3);
Bme280CalibrationData.dig_H4 = (I2cRead8(bmp_address, BME280_REGISTER_DIG_H4) << 4) | (I2cRead8(bmp_address, BME280_REGISTER_DIG_H4 + 1) & 0xF);
Bme280CalibrationData.dig_H5 = (I2cRead8(bmp_address, BME280_REGISTER_DIG_H5 + 1) << 4) | (I2cRead8(bmp_address, BME280_REGISTER_DIG_H5) >> 4);
Bme280CalibrationData.dig_H6 = (int8_t)I2cRead8(bmp_address, BME280_REGISTER_DIG_H6);
// Set before CONTROL_meas (DS 5.4.3)
I2cWrite8(bmp_address, BME280_REGISTER_CONTROLHUMID, 0x05); // 16x oversampling (Adafruit)
}
I2cWrite8(bmp_address, BME280_REGISTER_CONTROL, 0xB7); // 16x oversampling, normal mode (Adafruit)
return true;
}
double Bme280ReadTemperature(void)
{
int32_t var1;
int32_t var2;
int32_t adc_T = I2cRead24(bmp_address, BME280_REGISTER_TEMPDATA);
adc_T >>= 4;
var1 = ((((adc_T >> 3) - ((int32_t)Bme280CalibrationData.dig_T1 << 1))) * ((int32_t)Bme280CalibrationData.dig_T2)) >> 11;
var2 = (((((adc_T >> 4) - ((int32_t)Bme280CalibrationData.dig_T1)) * ((adc_T >> 4) - ((int32_t)Bme280CalibrationData.dig_T1))) >> 12) *
((int32_t)Bme280CalibrationData.dig_T3)) >> 14;
t_fine = var1 + var2;
double T = (t_fine * 5 + 128) >> 8;
return T / 100.0;
}
double Bme280ReadPressure(void)
{
int64_t var1;
int64_t var2;
int64_t p;
// Must be done first to get the t_fine variable set up
// Bme280ReadTemperature();
int32_t adc_P = I2cRead24(bmp_address, BME280_REGISTER_PRESSUREDATA);
adc_P >>= 4;
var1 = ((int64_t)t_fine) - 128000;
var2 = var1 * var1 * (int64_t)Bme280CalibrationData.dig_P6;
var2 = var2 + ((var1 * (int64_t)Bme280CalibrationData.dig_P5) << 17);
var2 = var2 + (((int64_t)Bme280CalibrationData.dig_P4) << 35);
var1 = ((var1 * var1 * (int64_t)Bme280CalibrationData.dig_P3) >> 8) + ((var1 * (int64_t)Bme280CalibrationData.dig_P2) << 12);
var1 = (((((int64_t)1) << 47) + var1)) * ((int64_t)Bme280CalibrationData.dig_P1) >> 33;
if (0 == var1) {
return 0; // avoid exception caused by division by zero
}
p = 1048576 - adc_P;
p = (((p << 31) - var2) * 3125) / var1;
var1 = (((int64_t)Bme280CalibrationData.dig_P9) * (p >> 13) * (p >> 13)) >> 25;
var2 = (((int64_t)Bme280CalibrationData.dig_P8) * p) >> 19;
p = ((p + var1 + var2) >> 8) + (((int64_t)Bme280CalibrationData.dig_P7) << 4);
return (double)p / 25600.0;
}
double Bme280ReadHumidity(void)
{
int32_t v_x1_u32r;
// Must be done first to get the t_fine variable set up
// Bme280ReadTemperature();
int32_t adc_H = I2cRead16(bmp_address, BME280_REGISTER_HUMIDDATA);
v_x1_u32r = (t_fine - ((int32_t)76800));
v_x1_u32r = (((((adc_H << 14) - (((int32_t)Bme280CalibrationData.dig_H4) << 20) -
(((int32_t)Bme280CalibrationData.dig_H5) * v_x1_u32r)) + ((int32_t)16384)) >> 15) *
(((((((v_x1_u32r * ((int32_t)Bme280CalibrationData.dig_H6)) >> 10) *
(((v_x1_u32r * ((int32_t)Bme280CalibrationData.dig_H3)) >> 11) + ((int32_t)32768))) >> 10) +
((int32_t)2097152)) * ((int32_t)Bme280CalibrationData.dig_H2) + 8192) >> 14));
v_x1_u32r = (v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) *
((int32_t)Bme280CalibrationData.dig_H1)) >> 4));
v_x1_u32r = (v_x1_u32r < 0) ? 0 : v_x1_u32r;
v_x1_u32r = (v_x1_u32r > 419430400) ? 419430400 : v_x1_u32r;
double h = (v_x1_u32r >> 12);
return h / 1024.0;
}
/*********************************************************************************************\
* BMP
\*********************************************************************************************/
double BmpReadTemperature(void)
{
double t = NAN;
switch (bmp_type)
{
case BMP180_CHIPID:
t = Bmp180ReadTemperature();
break;
case BMP280_CHIPID:
case BME280_CHIPID:
t = Bme280ReadTemperature();
}
if (!isnan(t))
{
t = ConvertTemp(t);
return t;
}
return 0;
}
double BmpReadPressure(void)
{
double pressure = 0.0;
switch (bmp_type) {
case BMP180_CHIPID:
pressure = Bmp180ReadPressure();
break;
case BMP280_CHIPID:
case BME280_CHIPID:
pressure = Bme280ReadPressure();
}
if (pressure != 0.0) {
// bmp_sealevel = pressure / pow(1.0 - ((float)Settings.altitude / 44330.0), 5.255); // pow adds 8k to the code
bmp_sealevel = (pressure / FastPrecisePow(1.0 - ((float)Settings.altitude / 44330.0), 5.255)) - 21.6;
}
return pressure;
}
double BmpReadHumidity(void)
{
switch (bmp_type) {
case BMP180_CHIPID:
case BMP280_CHIPID:
break;
case BME280_CHIPID:
return Bme280ReadHumidity();
}
return 0;
}
/********************************************************************************************/
boolean BmpDetect()
{
if (bmp_type) {
return true;
}
boolean success = false;
bmp_address = BMP_ADDR;
bmp_type = I2cRead8(bmp_address, BMP_REGISTER_CHIPID);
if (!bmp_type) {
bmp_address--;
bmp_type = I2cRead8(bmp_address, BMP_REGISTER_CHIPID);
}
strcpy_P(bmp_types, PSTR("BMP"));
switch (bmp_type) {
case BMP180_CHIPID:
success = Bmp180Calibration();
strcpy_P(bmp_types, PSTR("BMP180"));
break;
case BMP280_CHIPID:
success = Bmx280Calibrate();
strcpy_P(bmp_types, PSTR("BMP280"));
break;
case BME280_CHIPID:
success = Bmx280Calibrate();
strcpy_P(bmp_types, PSTR("BME280"));
}
if (success) {
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, bmp_types, bmp_address);
AddLog(LOG_LEVEL_DEBUG);
}
else {
bmp_type = 0;
}
return success;
}
void BmpShow(boolean json)
{
if (bmp_type) {
char temperature[10];
char pressure[10];
char humidity[10];
char sea_pressure[10];
char sealevel[40];
double t = BmpReadTemperature();
double p = BmpReadPressure();
double h = BmpReadHumidity();
dtostrfd(t, Settings.flag.temperature_resolution, temperature);
dtostrfd(p, Settings.flag.pressure_resolution, pressure);
dtostrfd(h, Settings.flag.humidity_resolution, humidity);
dtostrfd(bmp_sealevel, Settings.flag.pressure_resolution, sea_pressure);
if (json) {
snprintf_P(sealevel, sizeof(sealevel), PSTR(", \"" D_PRESSUREATSEALEVEL "\":%s"), sea_pressure);
if (BME280_CHIPID == bmp_type) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s, \"%s\":{\"" D_TEMPERATURE "\":%s, \"" D_HUMIDITY "\":%s, \"" D_PRESSURE "\":%s%s}"),
mqtt_data, bmp_types, temperature, humidity, pressure, (Settings.altitude != 0) ? sealevel : "");
}
else {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s, \"%s\":{\"" D_TEMPERATURE "\":%s, \"" D_PRESSURE "\":%s%s}"),
mqtt_data, bmp_types, temperature, pressure, (Settings.altitude != 0) ? sealevel : "");
}
#ifdef USE_DOMOTICZ
DomoticzTempHumPressureSensor(temperature, humidity, pressure);
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_TEMP, mqtt_data, bmp_types, temperature, TempUnit());
if (BME280_CHIPID == bmp_type) {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_HUM, mqtt_data, bmp_types, humidity);
}
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_PRESSURE, mqtt_data, bmp_types, pressure);
if (Settings.altitude != 0) {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_SEAPRESSURE, mqtt_data, bmp_types, sea_pressure);
}
#endif // USE_WEBSERVER
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
#define XSNS_09
boolean Xsns09(byte function)
{
boolean result = false;
if (i2c_flg) {
switch (function) {
// case FUNC_XSNS_INIT:
// break;
case FUNC_XSNS_PREP:
BmpDetect();
break;
case FUNC_XSNS_JSON_APPEND:
BmpShow(1);
break;
#ifdef USE_WEBSERVER
case FUNC_XSNS_WEB:
BmpShow(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_BMP
#endif // USE_I2C
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