mirror of
https://github.com/espressif/esp-idf.git
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111 lines
4.4 KiB
C
111 lines
4.4 KiB
C
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/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#pragma once
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/***************************************************
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* BMP180 Register Addresses
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***************************************************/
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#define BMP180_SENSOR_I2C_ADDR 0x77
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#define BMP180_SENSOR_REG_ADDR_WHO_AM_I 0xD0
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#define BMP180_SENSOR_REG_ADDR_SOFT_RESET 0xE0
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#define BMP180_SENSOR_REG_ADDR_AC1_MSB 0xAA
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#define BMP180_SENSOR_REG_ADDR_AC1_LSB 0xAB
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#define BMP180_SENSOR_REG_ADDR_AC2_MSB 0xAC
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#define BMP180_SENSOR_REG_ADDR_AC2_LSB 0xAD
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#define BMP180_SENSOR_REG_ADDR_AC3_MSB 0xAE
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#define BMP180_SENSOR_REG_ADDR_AC3_LSB 0xAF
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#define BMP180_SENSOR_REG_ADDR_AC4_MSB 0xB0
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#define BMP180_SENSOR_REG_ADDR_AC4_LSB 0xB1
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#define BMP180_SENSOR_REG_ADDR_AC5_MSB 0xB2
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#define BMP180_SENSOR_REG_ADDR_AC5_LSB 0xB3
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#define BMP180_SENSOR_REG_ADDR_AC6_MSB 0xB4
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#define BMP180_SENSOR_REG_ADDR_AC6_LSB 0xB5
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#define BMP180_SENSOR_REG_ADDR_B1_MSB 0xB6
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#define BMP180_SENSOR_REG_ADDR_B1_LSB 0xB7
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#define BMP180_SENSOR_REG_ADDR_B2_MSB 0xB8
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#define BMP180_SENSOR_REG_ADDR_B2_LSB 0xB9
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#define BMP180_SENSOR_REG_ADDR_MB_MSB 0xBA
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#define BMP180_SENSOR_REG_ADDR_MB_LSB 0xBB
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#define BMP180_SENSOR_REG_ADDR_MC_MSB 0xBC
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#define BMP180_SENSOR_REG_ADDR_MC_LSB 0xBD
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#define BMP180_SENSOR_REG_ADDR_MD_MSB 0xBE
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#define BMP180_SENSOR_REG_ADDR_MD_LSB 0xBF
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#define BMP180_SENSOR_REG_ADDR_CTRL_REG 0xF4
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#define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB 0xF6
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#define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB 0xF7
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#define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_XLSB 0xF8
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/***************************************************
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* BMP180 Control Commands
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***************************************************/
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#define BMP180_SENSOR_CMD_READ_TEMPERATURE 0x2E
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0 0x34
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1 0x74
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2 0xB4
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3 0xF4
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#define BMP180_SENSOR_CMD_SOFT_RESET 0xB6
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/***************************************************
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* BMP180 Chip ID
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***************************************************/
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#define BMP180_SENSOR_CHIP_ID 0x55
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/***************************************************
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* BMP180 Calibration Data
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***************************************************/
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typedef struct {
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int16_t ac1;
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int16_t ac2;
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int16_t ac3;
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uint16_t ac4;
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uint16_t ac5;
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uint16_t ac6;
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int16_t b1;
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int16_t b2;
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int16_t mb;
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int16_t mc;
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int16_t md;
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} bmp180_cal_data_t;
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bmp180_cal_data_t bmp180_cal_data;
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/***************************************************
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* BMP180 Oversampling setting to measure pressure
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***************************************************/
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typedef enum {
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OSS_0 = 0, // Ultra low power
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OSS_1 = 1, // Standard
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OSS_2 = 2, // High resolution
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OSS_3 = 3 // Ultra high resolution
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} oss_mode_t;
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/***************************************************
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* BMP180 Interaction APIs
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***************************************************/
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static void bmp180_read_cal_data(void); // Read cal data
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static void bmp180_read_ut_data(int16_t *ut_data); // Read uncompensated temperature
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static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode); // Read uncompensated pressure
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/************************************************
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* BMP180 Utility APIs
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************************************************/
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static void bmp180_read16(uint16_t *data_out, uint32_t reg_msb, uint32_t reg_lsb);
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static int32_t bmp180_calculate_real_temp(int32_t ut_data);
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static int32_t bmp180_calculate_real_pressure(int32_t up_data, int32_t ut_data, oss_mode_t oss_mode);
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/************************************************
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* Pressure measurement mode
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************************************************/
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#define EXAMPLE_OSS_MODE OSS_0
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/************************************************
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* Temperature and Pressure thresholds (uncompensated) to wake up Main CPU
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* The threshold values have been selected for demp purposes and may not
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* represent real world use case.
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************************************************/
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#define EXAMPLE_UT_THRESHOLD 20000
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#define EXAMPLE_UP_THRESHOLD 40000
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