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bmp lib fixed

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This commit is contained in:
MightyPork
2023-01-14 00:47:20 +01:00
parent 24152cbc0b
commit 1bb827c5db
6 changed files with 177 additions and 108 deletions
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components/bmp280/CMakeLists.txt
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set(COMPONENT_ADD_INCLUDEDIRS .)
set(COMPONENT_SRCS "bmp280.c")
#set(COMPONENT_REQUIRES console spi_flash)
register_component()
components/bmp280/README.md
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# Driver for BMP280 and BME280 absolute barometric pressure sensors
The driver works only with BMP280 and BME280 sensors. For BMP080/BMP180 there's
a separate driver. Even though BMP280 is a successor of BMP180 they are not
compatible. They have different registers and different operation modes.
BMP280 supports two ways of communication: spi and i2c. This driver provides
only i2c communication.
The driver is written for [esp-open-rtos](https://github.com/SuperHouse/esp-open-rtos)
framework and requires [i2c driver](https://github.com/SuperHouse/esp-open-rtos/tree/master/extras/i2c)
from it.
## Features
* I2C communication.
* Forced mode (Similar to BMP180 operation).
* Normal mode. Continuous measurement.
* Soft reset.
## Usage
Connect BMP280 or BME280 module to you ESP8266 module and initialize the I2C SCL and SDA pins:
```
const uint8_t bus = 0;
const uint8_t scl_pin = 0;
const uint8_t sda_pin = 2;
i2c_init(bus, scl_pin, sda_pin, I2C_FREQ_100K);
```
Pull up SDO pin of BMP280 in order to have address 0x77 `BMP280_I2C_ADDRESS_1`.
Or pull down SDO pin for address 0x76 `BMP280_I2C_ADDRESS_0`. Otherwise your
sensor will not work.
The BMP280 or BME280 are auto-detected at initialization based on the chip ID
and this ID is stored in the device descriptor.
BMP280 supports two operation modes.
### Forced mode
In forced mode, a single measurement is performed according to selected
configuration. When the measurement is finished, the sensor returns to
sleep mode and the measurement results can be read.
### Normal mode
Normal mode continuously cycles between measurement period and standby period,
whose time is defined by standby_time.
## Example
### Forced mode
```
bmp280_params_t params;
float pressure, temperature, humidity;
bmp280_init_default_params(&params);
params.mode = BMP280_MODE_FORCED;
bmp280_t bmp280_dev;
bmp280_dev.i2c_addr = BMP280_I2C_ADDRESS_0;
bmp280_init(&bmp280_dev, &params);
bool bme280p = bmp280_dev.id == BME280_CHIP_ID;
while(1) {
bmp280_force_measurement(&bmp280_dev));
// wait for measurement to complete
while (bmp280_is_measuring(&bmp280_dev)) {};
bmp280_read_float(&bmp280_dev, &temperature, &pressure, &humidity);
printf("Pressure: %.2f Pa, Temperature: %.2f C", pressure, temperature);
if (bme280p)
printf(", Humidity: %.2f\n", humidity);
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
```
### Normal mode
```
bmp280_params_t params;
float pressure, temperature, humidity;
bmp280_init_default_params(&params);
bmp280_t bmp280_dev;
bmp280_dev.i2c_addr = BMP280_I2C_ADDRESS_0;
bmp280_init(&bmp280_dev, &params);
bool bme280p = bmp280_dev.id == BME280_CHIP_ID;
while(1) {
bmp280_read_float(&bmp280_dev, &temperature, &pressure, &humidity);
printf("Pressure: %.2f Pa, Temperature: %.2f C", pressure, temperature);
if (bme280p)
printf(", Humidity: %.2f\n", humidity);
else
printf("\n");
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
```
## License
The driver is released under MIT license.
Copyright (c) 2016 sheinz (https://github.com/sheinz)
components/bmp280/bmp280.c
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/**
* The MIT License (MIT)
*
* Copyright (c) 2016 sheinz (https://github.com/sheinz)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stddef.h>
#include "bmp280.h"
#include "driver/i2c.h"
#ifdef BMP280_DEBUG
#include <stdio.h>
#define debug(fmt, ...) printf("%s" fmt "\n", "bmp280: ", ## __VA_ARGS__);
#else
#define debug(fmt, ...)
#endif
/**
* BMP280 registers
*/
#define BMP280_REG_TEMP_XLSB 0xFC /* bits: 7-4 */
#define BMP280_REG_TEMP_LSB 0xFB
#define BMP280_REG_TEMP_MSB 0xFA
#define BMP280_REG_TEMP (BMP280_REG_TEMP_MSB)
#define BMP280_REG_PRESS_XLSB 0xF9 /* bits: 7-4 */
#define BMP280_REG_PRESS_LSB 0xF8
#define BMP280_REG_PRESS_MSB 0xF7
#define BMP280_REG_PRESSURE (BMP280_REG_PRESS_MSB)
#define BMP280_REG_CONFIG 0xF5 /* bits: 7-5 t_sb; 4-2 filter; 0 spi3w_en */
#define BMP280_REG_CTRL 0xF4 /* bits: 7-5 osrs_t; 4-2 osrs_p; 1-0 mode */
#define BMP280_REG_STATUS 0xF3 /* bits: 3 measuring; 0 im_update */
#define BMP280_REG_CTRL_HUM 0xF2 /* bits: 2-0 osrs_h; */
#define BMP280_REG_RESET 0xE0
#define BMP280_REG_ID 0xD0
#define BMP280_REG_CALIB 0x88
#define BMP280_REG_HUM_CALIB 0x88
#define BMP280_RESET_VALUE 0xB6
void bmp280_init_default_params(bmp280_params_t *params)
{
params->mode = BMP280_MODE_NORMAL;
params->filter = BMP280_FILTER_OFF;
params->oversampling_pressure = BMP280_STANDARD;
params->oversampling_temperature = BMP280_STANDARD;
params->oversampling_humidity = BMP280_STANDARD;
params->standby = BMP280_STANDBY_250;
}
static inline esp_err_t read_data(bmp280_i2c_dev_t *dev, uint8_t addr, uint8_t *value, uint8_t len)
{
int ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, dev->addr << 1 | I2C_MASTER_WRITE, true);
i2c_master_write_byte(cmd, addr, true);
i2c_master_start(cmd);
i2c_master_write_byte(cmd, dev->addr << 1 | I2C_MASTER_READ, true);
i2c_master_read(cmd, value, len, I2C_MASTER_LAST_NACK);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(dev->i2c_num, cmd, pdMS_TO_TICKS(BMP280_I2C_TIMEOUT_MS));
i2c_cmd_link_delete(cmd);
return ret;
}
static esp_err_t read_register16(bmp280_i2c_dev_t *dev, uint8_t addr, uint16_t *value)
{
uint8_t bytes[2];
esp_err_t ret = read_data(dev, addr, bytes, 2);
*value = bytes[1] << 8 | bytes[0];
return ret;
}
static esp_err_t write_register8(bmp280_i2c_dev_t *dev, uint8_t addr, uint8_t value)
{
int ret;
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, dev->addr << 1 | I2C_MASTER_WRITE, 1);
i2c_master_write_byte(cmd, addr, true);
i2c_master_write_byte(cmd, value, true);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(dev->i2c_num, cmd, pdMS_TO_TICKS(BMP280_I2C_TIMEOUT_MS));
i2c_cmd_link_delete(cmd);
return ret;
}
static bool read_calibration_data(bmp280_t *dev)
{
if (ESP_OK == read_register16(&dev->i2c_dev, 0x88, &dev->dig_T1) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x8a, (uint16_t *)&dev->dig_T2) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x8c, (uint16_t *)&dev->dig_T3) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x8e, &dev->dig_P1) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x90, (uint16_t *)&dev->dig_P2) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x92, (uint16_t *)&dev->dig_P3) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x94, (uint16_t *)&dev->dig_P4) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x96, (uint16_t *)&dev->dig_P5) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x98, (uint16_t *)&dev->dig_P6) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x9a, (uint16_t *)&dev->dig_P7) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x9c, (uint16_t *)&dev->dig_P8) &&
ESP_OK == read_register16(&dev->i2c_dev, 0x9e, (uint16_t *)&dev->dig_P9)) {
debug("Calibration data received:");
debug("dig_T1=%d", dev->dig_T1);
debug("dig_T2=%d", dev->dig_T2);
debug("dig_T3=%d", dev->dig_T3);
debug("dig_P1=%d", dev->dig_P1);
debug("dig_P2=%d", dev->dig_P2);
debug("dig_P3=%d", dev->dig_P3);
debug("dig_P4=%d", dev->dig_P4);
debug("dig_P5=%d", dev->dig_P5);
debug("dig_P6=%d", dev->dig_P6);
debug("dig_P7=%d", dev->dig_P7);
debug("dig_P8=%d", dev->dig_P8);
debug("dig_P9=%d", dev->dig_P9);
return true;
}
return false;
}
static bool read_hum_calibration_data(bmp280_t *dev)
{
uint16_t h4, h5;
if (ESP_OK == read_data(&dev->i2c_dev, 0xa1, &dev->dig_H1, 1) &&
ESP_OK == read_register16(&dev->i2c_dev, 0xe1, (uint16_t *)&dev->dig_H2) &&
ESP_OK == read_data(&dev->i2c_dev, 0xe3, &dev->dig_H3, 1) &&
ESP_OK == read_register16(&dev->i2c_dev, 0xe4, &h4) &&
ESP_OK == read_register16(&dev->i2c_dev, 0xe5, &h5) &&
ESP_OK == read_data(&dev->i2c_dev, 0xe7, (uint8_t *)&dev->dig_H6, 1))
{
dev->dig_H4 = (h4 & 0x00ff) << 4 | (h4 & 0x0f00) >> 8;
dev->dig_H5 = h5 >> 4;
debug("Calibration data received:");
debug("dig_H1=%d", dev->dig_H1);
debug("dig_H2=%d", dev->dig_H2);
debug("dig_H3=%d", dev->dig_H3);
debug("dig_H4=%d", dev->dig_H4);
debug("dig_H5=%d", dev->dig_H5);
debug("dig_H6=%d", dev->dig_H6);
return true;
}
return false;
}
bool bmp280_init(bmp280_t *dev, bmp280_params_t *params)
{
if (dev->i2c_dev.addr != BMP280_I2C_ADDRESS_0 && dev->i2c_dev.addr != BMP280_I2C_ADDRESS_1) {
debug("Invalid I2C address");
return false;
}
if (ESP_OK != read_data(&dev->i2c_dev, BMP280_REG_ID, &dev->id, 1)) {
debug("Sensor not found");
return false;
}
if (dev->id != BMP280_CHIP_ID && dev->id != BME280_CHIP_ID) {
debug("Sensor wrong version");
return false;
}
// Soft reset.
if (ESP_OK != write_register8(&dev->i2c_dev, BMP280_REG_RESET, BMP280_RESET_VALUE)) {
debug("Failed resetting sensor");
return false;
}
// Wait until finished copying over the NVP data.
while (1) {
uint8_t status = 1;
if (ESP_OK != read_data(&dev->i2c_dev, BMP280_REG_STATUS, &status, 1) || (status & 1) == 0)
break;
}
if (!read_calibration_data(dev)) {
debug("Failed to read calibration data");
return false;
}
if (dev->id == BME280_CHIP_ID && !read_hum_calibration_data(dev)) {
debug("Failed to read humidity calibration data");
return false;
}
uint8_t config = (params->standby << 5) | (params->filter << 2);
debug("Writing config reg=%x", config);
if (ESP_OK != write_register8(&dev->i2c_dev, BMP280_REG_CONFIG, config)) {
debug("Failed configuring sensor");
return false;
}
if (params->mode == BMP280_MODE_FORCED) {
params->mode = BMP280_MODE_SLEEP; // initial mode for forced is sleep
}
uint8_t ctrl = (params->oversampling_temperature << 5) | (params->oversampling_pressure << 2)
| (params->mode);
if (dev->id == BME280_CHIP_ID) {
// Write crtl hum reg first, only active after write to BMP280_REG_CTRL.
uint8_t ctrl_hum = params->oversampling_humidity;
debug("Writing ctrl hum reg=%x", ctrl_hum);
if (ESP_OK != write_register8(&dev->i2c_dev, BMP280_REG_CTRL_HUM, ctrl_hum)) {
debug("Failed controlling sensor");
return false;
}
}
debug("Writing ctrl reg=%x", ctrl);
if (ESP_OK != write_register8(&dev->i2c_dev, BMP280_REG_CTRL, ctrl)) {
debug("Failed controlling sensor");
return false;
}
return true;
}
bool bmp280_force_measurement(bmp280_t *dev)
{
uint8_t ctrl;
if (ESP_OK != read_data(&dev->i2c_dev, BMP280_REG_CTRL, &ctrl, 1))
return false;
ctrl &= ~0b11; // clear two lower bits
ctrl |= BMP280_MODE_FORCED;
debug("Writing ctrl reg=%x", ctrl);
if (ESP_OK != write_register8(&dev->i2c_dev, BMP280_REG_CTRL, ctrl)) {
debug("Failed starting forced mode");
return false;
}
return true;
}
bool bmp280_is_measuring(bmp280_t *dev)
{
uint8_t status;
if (ESP_OK != read_data(&dev->i2c_dev, BMP280_REG_STATUS, &status, 1))
return false;
if (status & (1 << 3)) {
debug("Status: measuring");
return true;
}
debug("Status: idle");
return false;
}
/**
* Compensation algorithm is taken from BMP280 datasheet.
*
* Return value is in degrees Celsius.
*/
static inline int32_t compensate_temperature(bmp280_t *dev,
int32_t adc_temp, int32_t *fine_temp)
{
int32_t var1, var2;
var1 = ((((adc_temp >> 3) - ((int32_t)dev->dig_T1 << 1)))
* (int32_t)dev->dig_T2) >> 11;
var2 = (((((adc_temp >> 4) - (int32_t)dev->dig_T1)
* ((adc_temp >> 4) - (int32_t)dev->dig_T1)) >> 12)
* (int32_t)dev->dig_T3) >> 14;
*fine_temp = var1 + var2;
return (*fine_temp * 5 + 128) >> 8;
}
/**
* Compensation algorithm is taken from BMP280 datasheet.
*
* Return value is in Pa, 24 integer bits and 8 fractional bits.
*/
static inline uint32_t compensate_pressure(bmp280_t *dev,
int32_t adc_press, int32_t fine_temp)
{
int64_t var1, var2, p;
var1 = (int64_t)fine_temp - 128000;
var2 = var1 * var1 * (int64_t)dev->dig_P6;
var2 = var2 + ((var1 * (int64_t)dev->dig_P5) << 17);
var2 = var2 + (((int64_t)dev->dig_P4) << 35);
var1 = ((var1 * var1 * (int64_t)dev->dig_P3) >> 8) +
((var1 * (int64_t)dev->dig_P2) << 12);
var1 = (((int64_t)1 << 47) + var1) * ((int64_t)dev->dig_P1) >> 33;
if (var1 == 0) {
return 0; // avoid exception caused by division by zero
}
p = 1048576 - adc_press;
p = (((p << 31) - var2) * 3125) / var1;
var1 = ((int64_t)dev->dig_P9 * (p >> 13) * (p >> 13)) >> 25;
var2 = ((int64_t)dev->dig_P8 * p) >> 19;
p = ((p + var1 + var2) >> 8) + ((int64_t)dev->dig_P7 << 4);
return p;
}
/**
* Compensation algorithm is taken from BME280 datasheet.
*
* Return value is in Pa, 24 integer bits and 8 fractional bits.
*/
static inline uint32_t compensate_humidity(bmp280_t *dev,
int32_t adc_hum, int32_t fine_temp)
{
int32_t v_x1_u32r;
v_x1_u32r = fine_temp - (int32_t)76800;
v_x1_u32r = ((((adc_hum << 14) - ((int32_t)dev->dig_H4 << 20) -
((int32_t)dev->dig_H5 * v_x1_u32r)) +
(int32_t)16384) >> 15) *
(((((((v_x1_u32r * (int32_t)dev->dig_H6) >> 10) *
(((v_x1_u32r * (int32_t)dev->dig_H3) >> 11) +
(int32_t)32768)) >> 10) + (int32_t)2097152) *
(int32_t)dev->dig_H2 + 8192) >> 14);
v_x1_u32r = v_x1_u32r - (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7) *
(int32_t)dev->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;
return v_x1_u32r >> 12;
}
bool bmp280_read_fixed(bmp280_t *dev, int32_t *temperature,
uint32_t *pressure, uint32_t *humidity)
{
int32_t adc_pressure;
int32_t adc_temp;
uint8_t data[8];
// Only the BME280 supports reading the humidity.
if (dev->id != BME280_CHIP_ID) {
if (humidity)
*humidity = 0;
humidity = NULL;
}
// Need to read in one sequence to ensure they match.
size_t size = humidity ? 8 : 6;
if (ESP_OK != read_data(&dev->i2c_dev, 0xf7, data, size)) {
debug("Failed reading");
return false;
}
adc_pressure = data[0] << 12 | data[1] << 4 | data[2] >> 4;
adc_temp = data[3] << 12 | data[4] << 4 | data[5] >> 4;
debug("ADC temperature: %d", adc_temp);
debug("ADC pressure: %d", adc_pressure);
int32_t fine_temp;
*temperature = compensate_temperature(dev, adc_temp, &fine_temp);
*pressure = compensate_pressure(dev, adc_pressure, fine_temp);
if (humidity) {
int32_t adc_humidity = data[6] << 8 | data[7];
debug("ADC humidity: %d", adc_humidity);
*humidity = compensate_humidity(dev, adc_humidity, fine_temp);
}
return true;
}
bool bmp280_read_float(bmp280_t *dev, float *temperature,
float *pressure, float *humidity)
{
int32_t fixed_temperature;
uint32_t fixed_pressure;
uint32_t fixed_humidity;
if (bmp280_read_fixed(dev, &fixed_temperature, &fixed_pressure,
humidity ? &fixed_humidity : NULL)) {
*temperature = (float)fixed_temperature/100;
*pressure = (float)fixed_pressure/256;
if (humidity)
*humidity = (float)fixed_humidity/1024;
return true;
}
return false;
}
components/bmp280/bmp280.h
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/**
* The MIT License (MIT)
*
* Copyright (c) 2016 sheinz (https://github.com/sheinz)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef __BMP280_H__
#define __BMP280_H__
#include <stdint.h>
#include <stdbool.h>
#include <driver/i2c.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* Uncomment to enable debug output.
*/
// #define BMP280_DEBUG
#define BMP280_I2C_TIMEOUT_MS 1000
/**
* BMP280 or BME280 address is 0x77 if SDO pin is high, and is 0x76 if
* SDO pin is low.
*/
#define BMP280_I2C_ADDRESS_0 0x76
#define BMP280_I2C_ADDRESS_1 0x77
#define BMP280_CHIP_ID 0x58 /* BMP280 has chip-id 0x58 */
#define BME280_CHIP_ID 0x60 /* BME280 has chip-id 0x60 */
/**
* Mode of BMP280 module operation.
* Forced - Measurement is initiated by user.
* Normal - Continues measurement.
*/
typedef enum {
BMP280_MODE_SLEEP = 0,
BMP280_MODE_FORCED = 1,
BMP280_MODE_NORMAL = 3
} BMP280_Mode;
typedef enum {
BMP280_FILTER_OFF = 0,
BMP280_FILTER_2 = 1,
BMP280_FILTER_4 = 2,
BMP280_FILTER_8 = 3,
BMP280_FILTER_16 = 4
} BMP280_Filter;
/**
* Pressure oversampling settings
*/
typedef enum {
BMP280_SKIPPED = 0, /* no measurement */
BMP280_ULTRA_LOW_POWER = 1, /* oversampling x1 */
BMP280_LOW_POWER = 2, /* oversampling x2 */
BMP280_STANDARD = 3, /* oversampling x4 */
BMP280_HIGH_RES = 4, /* oversampling x8 */
BMP280_ULTRA_HIGH_RES = 5 /* oversampling x16 */
} BMP280_Oversampling;
/**
* Stand by time between measurements in normal mode
*/
typedef enum {
BMP280_STANDBY_05 = 0, /* stand by time 0.5ms */
BMP280_STANDBY_62 = 1, /* stand by time 62.5ms */
BMP280_STANDBY_125 = 2, /* stand by time 125ms */
BMP280_STANDBY_250 = 3, /* stand by time 250ms */
BMP280_STANDBY_500 = 4, /* stand by time 500ms */
BMP280_STANDBY_1000 = 5, /* stand by time 1s */
BMP280_STANDBY_2000 = 6, /* stand by time 2s BMP280, 10ms BME280 */
BMP280_STANDBY_4000 = 7, /* stand by time 4s BMP280, 20ms BME280 */
} BMP280_StandbyTime;
/**
* Configuration parameters for BMP280 module.
* Use function bmp280_init_default_params to use default configuration.
*/
typedef struct {
BMP280_Mode mode;
BMP280_Filter filter;
BMP280_Oversampling oversampling_pressure;
BMP280_Oversampling oversampling_temperature;
BMP280_Oversampling oversampling_humidity;
BMP280_StandbyTime standby;
} bmp280_params_t;
typedef struct {
uint8_t addr;
i2c_port_t i2c_num;
} bmp280_i2c_dev_t;
typedef struct {
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;
/* Humidity compensation for BME280 */
uint8_t dig_H1;
int16_t dig_H2;
uint8_t dig_H3;
int16_t dig_H4;
int16_t dig_H5;
int8_t dig_H6;
bmp280_i2c_dev_t i2c_dev; /* I2C dev setting. */
uint8_t id; /* Chip ID */
} bmp280_t;
/**
* Initialize default parameters.
* Default configuration:
* mode: NORAML
* filter: OFF
* oversampling: x4
* standby time: 250ms
*/
void bmp280_init_default_params(bmp280_params_t *params);
/**
* Initialize BMP280 module, probes for the device, soft resets the device,
* reads the calibration constants, and configures the device using the supplied
* parameters. Returns true on success otherwise false.
*
* The I2C address is assumed to have been initialized in the dev, and
* may be either BMP280_I2C_ADDRESS_0 or BMP280_I2C_ADDRESS_1. If the I2C
* address is unknown then try initializing each in turn.
*
* This may be called again to soft reset the device and initialize it again.
*/
bool bmp280_init(bmp280_t *dev, bmp280_params_t *params);
/**
* Start measurement in forced mode.
* The module remains in forced mode after this call.
* Do not call this method in normal mode.
*/
bool bmp280_force_measurement(bmp280_t *dev);
/**
* Check if BMP280 is busy with measuring temperature/pressure.
* Return true if BMP280 is busy.
*/
bool bmp280_is_measuring(bmp280_t *dev);
/**
* Read compensated temperature and pressure data:
*
* Temperature in degrees Celsius times 100.
*
* Pressure in Pascals in fixed point 24 bit integer 8 bit fraction format.
*
* Humidity is optional and only read for the BME280, in percent relative
* humidity as a fixed point 22 bit interger and 10 bit fraction format.
*/
bool bmp280_read_fixed(bmp280_t *dev, int32_t *temperature,
uint32_t *pressure, uint32_t *humidity);
/**
* Read compensated temperature and pressure data:
* Temperature in degrees Celsius.
* Pressure in Pascals.
* Humidity is optional and only read for the BME280, in percent relative
* humidity.
*/
bool bmp280_read_float(bmp280_t *dev, float *temperature,
float *pressure, float *humidity);
#ifdef __cplusplus
}
#endif
#endif // __BMP280_H__
components/bmp280/component.mk
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#
# Component Makefile
#
# This Makefile should, at the very least, just include $(SDK_PATH)/Makefile. By default,
# this will take the sources in the src/ directory, compile them and link them into
# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable,
# please read the SDK documents if you need to do this.
#
COMPONENT_ADD_INCLUDEDIRS := .