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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/** \mainpage
*
****************************************************************************
* Copyright (C) 2012 - 2015 Bosch Sensortec GmbH
*
* File : bmp280.h
*
* Date : 2015/03/27
*
* Revision : 2.0.4(Pressure and Temperature compensation code revision is 1.1)
*
* Usage: Sensor Driver for BMP280 sensor
*
****************************************************************************
*
* \section License
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the copyright holder nor the names of the
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
* OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*
* The information provided is believed to be accurate and reliable.
* The copyright holder assumes no responsibility
* for the consequences of use
* of such information nor for any infringement of patents or
* other rights of third parties which may result from its use.
* No license is granted by implication or otherwise under any patent or
* patent rights of the copyright holder.
**************************************************************************/
/* BMP280 pressure and temperature module for Chrome EC */
#ifndef __CROS_EC_BARO_BMP280_H
#define __CROS_EC_BARO_BMP280_H
/*
* The addr field of barometer_sensor for I2C:
*
* +-------------------------------+---+
* | 7 bit i2c address | 0 |
* +-------------------------------+---+
*/
/*
* Bit 1 of 7-bit address: 0 - If SDO is connected to GND
* Bit 1 of 7-bit address: 1 - If SDO is connected to Vddio
*/
#define BMP280_I2C_ADDRESS1 ((0x76) << 1)
#define BMP280_I2C_ADDRESS2 ((0x77) << 1)
/*
* CHIP ID
*/
#define BMP280_CHIP_ID 0x58
/************************************************/
/* CALIBRATION PARAMETERS DEFINITION */
/************************************************/
#define BMP280_TEMPERATURE_CALIB_DIG_T1_LSB_REG 0x88
/************************************************/
/* REGISTER ADDRESS DEFINITION */
/************************************************/
#define BMP280_CHIP_ID_REG 0xD0
#define BMP280_RST_REG 0xE0 /*Softreset Register */
#define BMP280_STAT_REG 0xF3 /*Status Register */
#define BMP280_CTRL_MEAS_REG 0xF4 /*Ctrl Measure Register */
#define BMP280_CONFIG_REG 0xF5 /*Configuration Register */
#define BMP280_PRESSURE_MSB_REG 0xF7 /*Pressure MSB Register */
#define BMP280_PRESSURE_LSB_REG 0xF8 /*Pressure LSB Register */
#define BMP280_PRESSURE_XLSB_REG 0xF9 /*Pressure XLSB Register */
/************************************************/
/* POWER MODE DEFINITION */
/************************************************/
/* Sensor Specific constants */
#define BMP280_SLEEP_MODE 0x00
#define BMP280_FORCED_MODE 0x01
#define BMP280_NORMAL_MODE 0x03
#define BMP280_SOFT_RESET_CODE 0xB6
/************************************************/
/* STANDBY TIME DEFINITION */
/************************************************/
#define BMP280_STANDBY_TIME_1_MS 0x00
#define BMP280_STANDBY_TIME_63_MS 0x01
#define BMP280_STANDBY_TIME_125_MS 0x02
#define BMP280_STANDBY_TIME_250_MS 0x03
#define BMP280_STANDBY_TIME_500_MS 0x04
#define BMP280_STANDBY_TIME_1000_MS 0x05
#define BMP280_STANDBY_TIME_2000_MS 0x06
#define BMP280_STANDBY_TIME_4000_MS 0x07
/************************************************/
/* OVERSAMPLING DEFINITION */
/************************************************/
#define BMP280_OVERSAMP_SKIPPED 0x00
#define BMP280_OVERSAMP_1X 0x01
#define BMP280_OVERSAMP_2X 0x02
#define BMP280_OVERSAMP_4X 0x03
#define BMP280_OVERSAMP_8X 0x04
#define BMP280_OVERSAMP_16X 0x05
/************************************************/
/* DEFINITIONS FOR ARRAY SIZE OF DATA */
/************************************************/
#define BMP280_PRESSURE_DATA_SIZE 3
#define BMP280_DATA_FRAME_SIZE 6
#define BMP280_CALIB_DATA_SIZE 24
/*******************************************************/
/* SAMPLING PERIOD COMPUTATION CONSTANT */
/*******************************************************/
#define BMP280_STANDBY_CNT 8
#define T_INIT_MAX (20) /* (20/16 = 1.25ms) */
#define T_MEASURE_PER_OSRS_MAX (37) /* (37/16 = 2.31ms) */
#define T_SETUP_PRESSURE_MAX (10) /* (10/16 = 0.62ms) */
/*
* This is the measurement time required for pressure and temp
*/
#define BMP280_COMPUTE_TIME \
((T_INIT_MAX + T_MEASURE_PER_OSRS_MAX * \
(((1 << BMP280_OVERSAMP_TEMP) >> 1) + \
((1 << BMP280_OVERSAMP_PRES) >> 1)) + \
(BMP280_OVERSAMP_PRES ? T_SETUP_PRESSURE_MAX : 0) + 15) / 16)
/*
* These values are selected as per Bosch recommendation for
* standard handheld devices, with temp sensor not being used
*/
#define BMP280_OVERSAMP_PRES BMP280_OVERSAMP_4X
#define BMP280_OVERSAMP_TEMP BMP280_OVERSAMP_SKIPPED
/*******************************************************/
/* GET DRIVER DATA */
/*******************************************************/
#define BMP280_GET_DATA(_s) \
((struct bmp280_drv_data_t *)(_s)->drv_data)
/* Min and Max sampling frequency in mHz based on x4 oversampling used */
/* FIXME - verify how chip is setup to make sure MAX is correct, manual says
* "Typical", not Max.
*/
#define BMP280_BARO_MIN_FREQ 75000
#define BMP280_BARO_MAX_FREQ 87000
/**************************************************************/
/* STRUCTURE and ENUM DEFINITIONS */
/**************************************************************/
/*
* struct bmp280_calib_param_t - Holds all device specific
* calibration parameters
*
* @dig_T1 to dig_T3: calibration Temp data
* @dig_P1 to dig_P9: calibration Pressure data
* @t_fine: calibration t_fine data
*
*/
struct bmp280_calib_param_t {
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;
int32_t t_fine;
};
/*
* struct bmp280_t - This structure holds BMP280 initialization parameters
* @calib_param: calibration data
* @rate: frequency, in mHz.
* @range: bit offset to fit data in 16 bit or less.
*/
struct bmp280_drv_data_t {
struct bmp280_calib_param_t calib_param;
uint16_t rate;
uint16_t range;
};
#define BMP280_RATE_SHIFT 1
extern const struct accelgyro_drv bmp280_drv;
#ifdef CONFIG_CMD_I2C_STRESS_TEST_ACCEL
extern struct i2c_stress_test_dev bmp280_i2c_stress_test_dev;
#endif
#endif
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