/* * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Unlicense OR CC0-1.0 */ #pragma once /*************************************************** * BMP180 Register Addresses ***************************************************/ #define BMP180_SENSOR_I2C_ADDR 0x77 #define BMP180_SENSOR_REG_ADDR_WHO_AM_I 0xD0 #define BMP180_SENSOR_REG_ADDR_SOFT_RESET 0xE0 #define BMP180_SENSOR_REG_ADDR_AC1_MSB 0xAA #define BMP180_SENSOR_REG_ADDR_AC1_LSB 0xAB #define BMP180_SENSOR_REG_ADDR_AC2_MSB 0xAC #define BMP180_SENSOR_REG_ADDR_AC2_LSB 0xAD #define BMP180_SENSOR_REG_ADDR_AC3_MSB 0xAE #define BMP180_SENSOR_REG_ADDR_AC3_LSB 0xAF #define BMP180_SENSOR_REG_ADDR_AC4_MSB 0xB0 #define BMP180_SENSOR_REG_ADDR_AC4_LSB 0xB1 #define BMP180_SENSOR_REG_ADDR_AC5_MSB 0xB2 #define BMP180_SENSOR_REG_ADDR_AC5_LSB 0xB3 #define BMP180_SENSOR_REG_ADDR_AC6_MSB 0xB4 #define BMP180_SENSOR_REG_ADDR_AC6_LSB 0xB5 #define BMP180_SENSOR_REG_ADDR_B1_MSB 0xB6 #define BMP180_SENSOR_REG_ADDR_B1_LSB 0xB7 #define BMP180_SENSOR_REG_ADDR_B2_MSB 0xB8 #define BMP180_SENSOR_REG_ADDR_B2_LSB 0xB9 #define BMP180_SENSOR_REG_ADDR_MB_MSB 0xBA #define BMP180_SENSOR_REG_ADDR_MB_LSB 0xBB #define BMP180_SENSOR_REG_ADDR_MC_MSB 0xBC #define BMP180_SENSOR_REG_ADDR_MC_LSB 0xBD #define BMP180_SENSOR_REG_ADDR_MD_MSB 0xBE #define BMP180_SENSOR_REG_ADDR_MD_LSB 0xBF #define BMP180_SENSOR_REG_ADDR_CTRL_REG 0xF4 #define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB 0xF6 #define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB 0xF7 #define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_XLSB 0xF8 /*************************************************** * BMP180 Control Commands ***************************************************/ #define BMP180_SENSOR_CMD_READ_TEMPERATURE 0x2E #define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0 0x34 #define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1 0x74 #define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2 0xB4 #define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3 0xF4 #define BMP180_SENSOR_CMD_SOFT_RESET 0xB6 /*************************************************** * BMP180 Chip ID ***************************************************/ #define BMP180_SENSOR_CHIP_ID 0x55 /*************************************************** * BMP180 Calibration Data ***************************************************/ typedef struct { int16_t ac1; int16_t ac2; int16_t ac3; uint16_t ac4; uint16_t ac5; uint16_t ac6; int16_t b1; int16_t b2; int16_t mb; int16_t mc; int16_t md; } bmp180_cal_data_t; bmp180_cal_data_t bmp180_cal_data; /*************************************************** * BMP180 Oversampling setting to measure pressure ***************************************************/ typedef enum { OSS_0 = 0, // Ultra low power OSS_1 = 1, // Standard OSS_2 = 2, // High resolution OSS_3 = 3 // Ultra high resolution } oss_mode_t; /*************************************************** * BMP180 Interaction APIs ***************************************************/ static void bmp180_read_cal_data(void); // Read cal data static void bmp180_read_ut_data(int16_t *ut_data); // Read uncompensated temperature static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode); // Read uncompensated pressure /************************************************ * BMP180 Utility APIs ************************************************/ static void bmp180_read16(uint16_t *data_out, uint32_t reg_msb, uint32_t reg_lsb); static int32_t bmp180_calculate_real_temp(int32_t ut_data); static int32_t bmp180_calculate_real_pressure(int32_t up_data, int32_t ut_data, oss_mode_t oss_mode); /************************************************ * Pressure measurement mode ************************************************/ #define EXAMPLE_OSS_MODE OSS_0 /************************************************ * Temperature and Pressure thresholds (uncompensated) to wake up Main CPU * The threshold values have been selected for demo purposes and may not * represent real world use case. ************************************************/ #define EXAMPLE_UT_THRESHOLD 25000 #define EXAMPLE_UP_THRESHOLD 50000