Device driver for the BMP180 Digital pressure and temperature sensor.
Dependents: BMP180_example MAXWSNENV_sensors MAXWSNENV_sensors nRF51822_BMP180 ... more
BMP180 Device Driver
This is a device driver for the BMP180 Digital pressure sensor. It uses I2C to communicate pressure and temperature data.
BMP180.h@0:b2219e6e444b, 2015-04-17 (annotated)
- Committer:
- kgills
- Date:
- Fri Apr 17 09:31:09 2015 -0500
- Revision:
- 0:b2219e6e444b
Adding BMP180 library files.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kgills |
0:b2219e6e444b | 1 | /******************************************************************************* |
kgills |
0:b2219e6e444b | 2 | * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved. |
kgills |
0:b2219e6e444b | 3 | * |
kgills |
0:b2219e6e444b | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
kgills |
0:b2219e6e444b | 5 | * copy of this software and associated documentation files (the "Software"), |
kgills |
0:b2219e6e444b | 6 | * to deal in the Software without restriction, including without limitation |
kgills |
0:b2219e6e444b | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
kgills |
0:b2219e6e444b | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
kgills |
0:b2219e6e444b | 9 | * Software is furnished to do so, subject to the following conditions: |
kgills |
0:b2219e6e444b | 10 | * |
kgills |
0:b2219e6e444b | 11 | * The above copyright notice and this permission notice shall be included |
kgills |
0:b2219e6e444b | 12 | * in all copies or substantial portions of the Software. |
kgills |
0:b2219e6e444b | 13 | * |
kgills |
0:b2219e6e444b | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
kgills |
0:b2219e6e444b | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
kgills |
0:b2219e6e444b | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
kgills |
0:b2219e6e444b | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
kgills |
0:b2219e6e444b | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
kgills |
0:b2219e6e444b | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
kgills |
0:b2219e6e444b | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
kgills |
0:b2219e6e444b | 21 | * |
kgills |
0:b2219e6e444b | 22 | * Except as contained in this notice, the name of Maxim Integrated |
kgills |
0:b2219e6e444b | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
kgills |
0:b2219e6e444b | 24 | * Products, Inc. Branding Policy. |
kgills |
0:b2219e6e444b | 25 | * |
kgills |
0:b2219e6e444b | 26 | * The mere transfer of this software does not imply any licenses |
kgills |
0:b2219e6e444b | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
kgills |
0:b2219e6e444b | 28 | * trademarks, maskwork rights, or any other form of intellectual |
kgills |
0:b2219e6e444b | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
kgills |
0:b2219e6e444b | 30 | * ownership rights. |
kgills |
0:b2219e6e444b | 31 | ******************************************************************************* |
kgills |
0:b2219e6e444b | 32 | */ |
kgills |
0:b2219e6e444b | 33 | |
kgills |
0:b2219e6e444b | 34 | #ifndef _BMP180_H_ |
kgills |
0:b2219e6e444b | 35 | #define _BMP180_H_ |
kgills |
0:b2219e6e444b | 36 | |
kgills |
0:b2219e6e444b | 37 | #include "mbed.h" |
kgills |
0:b2219e6e444b | 38 | |
kgills |
0:b2219e6e444b | 39 | /** |
kgills |
0:b2219e6e444b | 40 | * Bosch BMP180 Digital Pressure Sensor |
kgills |
0:b2219e6e444b | 41 | * |
kgills |
0:b2219e6e444b | 42 | * @code |
kgills |
0:b2219e6e444b | 43 | * #include <stdio.h> |
kgills |
0:b2219e6e444b | 44 | * #include "mbed.h" |
kgills |
0:b2219e6e444b | 45 | * #include "BMP180.h" |
kgills |
0:b2219e6e444b | 46 | * |
kgills |
0:b2219e6e444b | 47 | * I2C i2c(I2C_SDA, I2C_SCL); |
kgills |
0:b2219e6e444b | 48 | * BMP180 bmp180(&i2c); |
kgills |
0:b2219e6e444b | 49 | * |
kgills |
0:b2219e6e444b | 50 | * int main(void) { |
kgills |
0:b2219e6e444b | 51 | * |
kgills |
0:b2219e6e444b | 52 | * while(1) { |
kgills |
0:b2219e6e444b | 53 | * if (bmp180.init() != 0) { |
kgills |
0:b2219e6e444b | 54 | * printf("Error communicating with BMP180\n"); |
kgills |
0:b2219e6e444b | 55 | * } else { |
kgills |
0:b2219e6e444b | 56 | * printf("Initialized BMP180\n"); |
kgills |
0:b2219e6e444b | 57 | * break; |
kgills |
0:b2219e6e444b | 58 | * } |
kgills |
0:b2219e6e444b | 59 | * wait(1); |
kgills |
0:b2219e6e444b | 60 | * } |
kgills |
0:b2219e6e444b | 61 | * |
kgills |
0:b2219e6e444b | 62 | * while(1) { |
kgills |
0:b2219e6e444b | 63 | * bmp180.startTemperature(); |
kgills |
0:b2219e6e444b | 64 | * wait_ms(5); // Wait for conversion to complete |
kgills |
0:b2219e6e444b | 65 | * float temp; |
kgills |
0:b2219e6e444b | 66 | * if(bmp180.getTemperature(&temp) != 0) { |
kgills |
0:b2219e6e444b | 67 | * printf("Error getting temperature\n"); |
kgills |
0:b2219e6e444b | 68 | * continue; |
kgills |
0:b2219e6e444b | 69 | * } |
kgills |
0:b2219e6e444b | 70 | * |
kgills |
0:b2219e6e444b | 71 | * bmp180.startPressure(BMP180::ULTRA_LOW_POWER); |
kgills |
0:b2219e6e444b | 72 | * wait_ms(10); // Wait for conversion to complete |
kgills |
0:b2219e6e444b | 73 | * int pressure; |
kgills |
0:b2219e6e444b | 74 | * if(bmp180.getPressure(&pressure) != 0) { |
kgills |
0:b2219e6e444b | 75 | * printf("Error getting pressure\n"); |
kgills |
0:b2219e6e444b | 76 | * continue; |
kgills |
0:b2219e6e444b | 77 | * } |
kgills |
0:b2219e6e444b | 78 | * |
kgills |
0:b2219e6e444b | 79 | * printf("Pressure = %d Pa Temperature = %f C\n", pressure, temp); |
kgills |
0:b2219e6e444b | 80 | * wait(1); |
kgills |
0:b2219e6e444b | 81 | * } |
kgills |
0:b2219e6e444b | 82 | * } |
kgills |
0:b2219e6e444b | 83 | * @endcode |
kgills |
0:b2219e6e444b | 84 | */ |
kgills |
0:b2219e6e444b | 85 | class BMP180 |
kgills |
0:b2219e6e444b | 86 | { |
kgills |
0:b2219e6e444b | 87 | |
kgills |
0:b2219e6e444b | 88 | public: |
kgills |
0:b2219e6e444b | 89 | |
kgills |
0:b2219e6e444b | 90 | /** |
kgills |
0:b2219e6e444b | 91 | * @brief Oversampling ratio. |
kgills |
0:b2219e6e444b | 92 | * @details Dictates how many pressure samples to take. Conversion time varies |
kgills |
0:b2219e6e444b | 93 | * depending on the number of samples taken. Refer to data sheet |
kgills |
0:b2219e6e444b | 94 | * for timing specifications. |
kgills |
0:b2219e6e444b | 95 | */ |
kgills |
0:b2219e6e444b | 96 | typedef enum { |
kgills |
0:b2219e6e444b | 97 | ULTRA_LOW_POWER = 0, ///< 1 pressure sample |
kgills |
0:b2219e6e444b | 98 | STANDARD = 1, ///< 2 pressure samples |
kgills |
0:b2219e6e444b | 99 | HIGH_RESOLUTION = 2, ///< 4 pressure samples |
kgills |
0:b2219e6e444b | 100 | ULTRA_HIGH_RESOLUTION = 3, ///< 8 pressure samples |
kgills |
0:b2219e6e444b | 101 | } oversampling_t; |
kgills |
0:b2219e6e444b | 102 | |
kgills |
0:b2219e6e444b | 103 | /** |
kgills |
0:b2219e6e444b | 104 | * BMP180 constructor. |
kgills |
0:b2219e6e444b | 105 | * |
kgills |
0:b2219e6e444b | 106 | * @param sda mbed pin to use for SDA line of I2C interface. |
kgills |
0:b2219e6e444b | 107 | * @param scl mbed pin to use for SCL line of I2C interface. |
kgills |
0:b2219e6e444b | 108 | */ |
kgills |
0:b2219e6e444b | 109 | BMP180(PinName sda, PinName scl); |
kgills |
0:b2219e6e444b | 110 | |
kgills |
0:b2219e6e444b | 111 | /** |
kgills |
0:b2219e6e444b | 112 | * BMP180 constructor. |
kgills |
0:b2219e6e444b | 113 | * |
kgills |
0:b2219e6e444b | 114 | * @param i2c I2C object to use. |
kgills |
0:b2219e6e444b | 115 | */ |
kgills |
0:b2219e6e444b | 116 | BMP180(I2C *i2c); |
kgills |
0:b2219e6e444b | 117 | |
kgills |
0:b2219e6e444b | 118 | /** |
kgills |
0:b2219e6e444b | 119 | * BMP180 destructor. |
kgills |
0:b2219e6e444b | 120 | */ |
kgills |
0:b2219e6e444b | 121 | ~BMP180(); |
kgills |
0:b2219e6e444b | 122 | |
kgills |
0:b2219e6e444b | 123 | /** |
kgills |
0:b2219e6e444b | 124 | * @brief Initialize BMP180. |
kgills |
0:b2219e6e444b | 125 | * @details Gets the device ID and saves the calibration values. |
kgills |
0:b2219e6e444b | 126 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 127 | */ |
kgills |
0:b2219e6e444b | 128 | int init(void); |
kgills |
0:b2219e6e444b | 129 | |
kgills |
0:b2219e6e444b | 130 | /** |
kgills |
0:b2219e6e444b | 131 | * @brief Reset BMP180. |
kgills |
0:b2219e6e444b | 132 | * @details Performs a soft reset of the device. Same sequence as power on reset. |
kgills |
0:b2219e6e444b | 133 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 134 | */ |
kgills |
0:b2219e6e444b | 135 | int reset(void); |
kgills |
0:b2219e6e444b | 136 | |
kgills |
0:b2219e6e444b | 137 | /** |
kgills |
0:b2219e6e444b | 138 | * @brief Check ID. |
kgills |
0:b2219e6e444b | 139 | * @details Checks the device ID, should be 0x55 on reset. |
kgills |
0:b2219e6e444b | 140 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 141 | */ |
kgills |
0:b2219e6e444b | 142 | int checkId(void); |
kgills |
0:b2219e6e444b | 143 | |
kgills |
0:b2219e6e444b | 144 | /** |
kgills |
0:b2219e6e444b | 145 | * @brief Start pressure conversion. |
kgills |
0:b2219e6e444b | 146 | * @details Initiates the pressure conversion sequence. Refer to data sheet |
kgills |
0:b2219e6e444b | 147 | * for timing specifications. |
kgills |
0:b2219e6e444b | 148 | * |
kgills |
0:b2219e6e444b | 149 | * @param oss Number of samples to take. |
kgills |
0:b2219e6e444b | 150 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 151 | */ |
kgills |
0:b2219e6e444b | 152 | int startPressure(BMP180::oversampling_t oss); |
kgills |
0:b2219e6e444b | 153 | |
kgills |
0:b2219e6e444b | 154 | /** |
kgills |
0:b2219e6e444b | 155 | * @brief Get pressure reading. |
kgills |
0:b2219e6e444b | 156 | * @details Calculates the pressure using the data calibration data and formula. |
kgills |
0:b2219e6e444b | 157 | * Pressure is reported in Pascals. |
kgills |
0:b2219e6e444b | 158 | * @note This function should be called after calling startPressure(). |
kgills |
0:b2219e6e444b | 159 | * Refer to the data sheet for the timing requirements. Calling this |
kgills |
0:b2219e6e444b | 160 | * function too soon can result in oversampling. |
kgills |
0:b2219e6e444b | 161 | * |
kgills |
0:b2219e6e444b | 162 | * @param pressure Pointer to store pressure reading. |
kgills |
0:b2219e6e444b | 163 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 164 | */ |
kgills |
0:b2219e6e444b | 165 | int getPressure(int *pressure); |
kgills |
0:b2219e6e444b | 166 | |
kgills |
0:b2219e6e444b | 167 | /** |
kgills |
0:b2219e6e444b | 168 | * @brief Start temperature conversion. |
kgills |
0:b2219e6e444b | 169 | * @details Initiates the temperature conversion sequence. Refer to data |
kgills |
0:b2219e6e444b | 170 | * sheet for timing specifications. |
kgills |
0:b2219e6e444b | 171 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 172 | */ |
kgills |
0:b2219e6e444b | 173 | int startTemperature(void); |
kgills |
0:b2219e6e444b | 174 | |
kgills |
0:b2219e6e444b | 175 | /** |
kgills |
0:b2219e6e444b | 176 | * @brief Get temperature reading. |
kgills |
0:b2219e6e444b | 177 | * @details Calculates the temperature using the data calibration data and formula. |
kgills |
0:b2219e6e444b | 178 | * Temperature is reported in degrees Celcius. |
kgills |
0:b2219e6e444b | 179 | * |
kgills |
0:b2219e6e444b | 180 | * @note This function should be called after calling startTemperature(). |
kgills |
0:b2219e6e444b | 181 | * Refer to the data sheet for the timing requirements. Calling this |
kgills |
0:b2219e6e444b | 182 | * function too soon can result in oversampling. |
kgills |
0:b2219e6e444b | 183 | * |
kgills |
0:b2219e6e444b | 184 | * @param tempC Pointer to store temperature reading. |
kgills |
0:b2219e6e444b | 185 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 186 | */ |
kgills |
0:b2219e6e444b | 187 | int getTemperature(float *tempC); |
kgills |
0:b2219e6e444b | 188 | |
kgills |
0:b2219e6e444b | 189 | /** |
kgills |
0:b2219e6e444b | 190 | * @brief Get temperature reading. |
kgills |
0:b2219e6e444b | 191 | * @details Calculates the temperature using the data calibration data and formula. |
kgills |
0:b2219e6e444b | 192 | * Temperature is reported in 1/10ths degrees Celcius. |
kgills |
0:b2219e6e444b | 193 | * |
kgills |
0:b2219e6e444b | 194 | * @note This function should be called after calling startTemperature(). |
kgills |
0:b2219e6e444b | 195 | * Refer to the data sheet for the timing requirements. Calling this |
kgills |
0:b2219e6e444b | 196 | * function too soon can result in oversampling. |
kgills |
0:b2219e6e444b | 197 | * |
kgills |
0:b2219e6e444b | 198 | * @param tempCx10 Pointer to store temperature reading. |
kgills |
0:b2219e6e444b | 199 | * @returns 0 if no errors, -1 if error. |
kgills |
0:b2219e6e444b | 200 | */ |
kgills |
0:b2219e6e444b | 201 | int getTemperature(int16_t *tempCx10); |
kgills |
0:b2219e6e444b | 202 | |
kgills |
0:b2219e6e444b | 203 | private: |
kgills |
0:b2219e6e444b | 204 | |
kgills |
0:b2219e6e444b | 205 | typedef union { |
kgills |
0:b2219e6e444b | 206 | uint16_t value[11]; |
kgills |
0:b2219e6e444b | 207 | struct { |
kgills |
0:b2219e6e444b | 208 | int16_t ac1; |
kgills |
0:b2219e6e444b | 209 | int16_t ac2; |
kgills |
0:b2219e6e444b | 210 | int16_t ac3; |
kgills |
0:b2219e6e444b | 211 | uint16_t ac4; |
kgills |
0:b2219e6e444b | 212 | uint16_t ac5; |
kgills |
0:b2219e6e444b | 213 | uint16_t ac6; |
kgills |
0:b2219e6e444b | 214 | int16_t b1; |
kgills |
0:b2219e6e444b | 215 | int16_t b2; |
kgills |
0:b2219e6e444b | 216 | int16_t mb; |
kgills |
0:b2219e6e444b | 217 | int16_t mc; |
kgills |
0:b2219e6e444b | 218 | int16_t md; |
kgills |
0:b2219e6e444b | 219 | }; |
kgills |
0:b2219e6e444b | 220 | } calibration_t; |
kgills |
0:b2219e6e444b | 221 | |
kgills |
0:b2219e6e444b | 222 | I2C *i2c_; |
kgills |
0:b2219e6e444b | 223 | bool i2c_owner; |
kgills |
0:b2219e6e444b | 224 | |
kgills |
0:b2219e6e444b | 225 | BMP180::calibration_t calib; |
kgills |
0:b2219e6e444b | 226 | int32_t b5; |
kgills |
0:b2219e6e444b | 227 | BMP180::oversampling_t oss_; |
kgills |
0:b2219e6e444b | 228 | }; |
kgills |
0:b2219e6e444b | 229 | |
kgills |
0:b2219e6e444b | 230 | #endif /* _BMP180_H_ */ |