Class for using BMP180 Bosch Pressure sensor
Dependents: ILI9341_Clock_Nucleo IoT-Polytech-Upmc
BMP180.h@0:b899fe37ce17, 2013-11-26 (annotated)
- Committer:
- harrypowers
- Date:
- Tue Nov 26 05:40:44 2013 +0000
- Revision:
- 0:b899fe37ce17
- Child:
- 1:4c6b41f1203d
code working now to add the compensation calculations for both temperature and pressure!
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
harrypowers | 0:b899fe37ce17 | 1 | #ifndef BMP180_H |
harrypowers | 0:b899fe37ce17 | 2 | #define BMP180_H |
harrypowers | 0:b899fe37ce17 | 3 | |
harrypowers | 0:b899fe37ce17 | 4 | /* BMP180 Digital Pressure Sensor Class for use with Mbed LPC1768 and other platforms |
harrypowers | 0:b899fe37ce17 | 5 | * BMP180 from Bosch Sensortec |
harrypowers | 0:b899fe37ce17 | 6 | * Copyright (c) 2013 Philip King Smith |
harrypowers | 0:b899fe37ce17 | 7 | * |
harrypowers | 0:b899fe37ce17 | 8 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
harrypowers | 0:b899fe37ce17 | 9 | * of this software and associated documentation files (the "Software"), to deal |
harrypowers | 0:b899fe37ce17 | 10 | * in the Software without restriction, including without limitation the rights |
harrypowers | 0:b899fe37ce17 | 11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
harrypowers | 0:b899fe37ce17 | 12 | * copies of the Software, and to permit persons to whom the Software is |
harrypowers | 0:b899fe37ce17 | 13 | * furnished to do so, subject to the following conditions: |
harrypowers | 0:b899fe37ce17 | 14 | * |
harrypowers | 0:b899fe37ce17 | 15 | * The above copyright notice and this permission notice shall be included in |
harrypowers | 0:b899fe37ce17 | 16 | * all copies or substantial portions of the Software. |
harrypowers | 0:b899fe37ce17 | 17 | * |
harrypowers | 0:b899fe37ce17 | 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
harrypowers | 0:b899fe37ce17 | 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
harrypowers | 0:b899fe37ce17 | 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
harrypowers | 0:b899fe37ce17 | 21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
harrypowers | 0:b899fe37ce17 | 22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
harrypowers | 0:b899fe37ce17 | 23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
harrypowers | 0:b899fe37ce17 | 24 | * THE SOFTWARE. |
harrypowers | 0:b899fe37ce17 | 25 | */ |
harrypowers | 0:b899fe37ce17 | 26 | |
harrypowers | 0:b899fe37ce17 | 27 | /** BMP180 Digital Pressure Sensor class using mbed's i2c class |
harrypowers | 0:b899fe37ce17 | 28 | * |
harrypowers | 0:b899fe37ce17 | 29 | * Example: |
harrypowers | 0:b899fe37ce17 | 30 | * @code |
harrypowers | 0:b899fe37ce17 | 31 | * // show how the BMP180 class works |
harrypowers | 0:b899fe37ce17 | 32 | * #include "BMP180.h" |
harrypowers | 0:b899fe37ce17 | 33 | * #include "mbed.h" |
harrypowers | 0:b899fe37ce17 | 34 | * |
harrypowers | 0:b899fe37ce17 | 35 | * Serial pc(USBTX, USBRX); // tx, rx for debug and usb pc comunications |
harrypowers | 0:b899fe37ce17 | 36 | * |
harrypowers | 0:b899fe37ce17 | 37 | * |
harrypowers | 0:b899fe37ce17 | 38 | * @endcode |
harrypowers | 0:b899fe37ce17 | 39 | */ |
harrypowers | 0:b899fe37ce17 | 40 | |
harrypowers | 0:b899fe37ce17 | 41 | #include "mbed.h" |
harrypowers | 0:b899fe37ce17 | 42 | |
harrypowers | 0:b899fe37ce17 | 43 | #define EEprom 22 // The EEPROM has 176bits of calibration data (176/8 = 22 Bytes) |
harrypowers | 0:b899fe37ce17 | 44 | #define BMP180ADDR 0xEF // I2C address of BMP180 device |
harrypowers | 0:b899fe37ce17 | 45 | #define BMP180FREQ 1000000 // Data sheet says 3.4 MHz is max but not sure what mbed can do here! |
harrypowers | 0:b899fe37ce17 | 46 | #define CMD_READ_VALUE 0xF6 |
harrypowers | 0:b899fe37ce17 | 47 | #define CMD_READ_CALIBRATION 0xAA |
harrypowers | 0:b899fe37ce17 | 48 | #define OVERSAMPLING_ULTRA_LOW_POWER 0 |
harrypowers | 0:b899fe37ce17 | 49 | #define OVERSAMPLING_STANDARD 1 |
harrypowers | 0:b899fe37ce17 | 50 | #define OVERSAMPLING_HIGH_RESOLUTION 2 |
harrypowers | 0:b899fe37ce17 | 51 | #define OVERSAMPLING_ULTRA_HIGH_RESOLUTION 3 |
harrypowers | 0:b899fe37ce17 | 52 | |
harrypowers | 0:b899fe37ce17 | 53 | class BMP180 |
harrypowers | 0:b899fe37ce17 | 54 | { |
harrypowers | 0:b899fe37ce17 | 55 | public: |
harrypowers | 0:b899fe37ce17 | 56 | /** Create object connected to BMP180 pins ( remember both pins need pull up resisters) |
harrypowers | 0:b899fe37ce17 | 57 | * |
harrypowers | 0:b899fe37ce17 | 58 | * Ensure the pull up resistors are used on these pins. Also note there is no checking on |
harrypowers | 0:b899fe37ce17 | 59 | * if you use thes pins p9, p10, p27, p28 so ensure you only use these ones on the LPC1768 device |
harrypowers | 0:b899fe37ce17 | 60 | * |
harrypowers | 0:b899fe37ce17 | 61 | * @param sda pin that DS1307 connected to (p9 or p28 as defined on LPC1768) |
harrypowers | 0:b899fe37ce17 | 62 | * @param slc pin that DS1307 connected to (p10 or p27 ad defined on LPC1768) |
harrypowers | 0:b899fe37ce17 | 63 | */ |
harrypowers | 0:b899fe37ce17 | 64 | BMP180(PinName sda, PinName slc); // Constructor |
harrypowers | 0:b899fe37ce17 | 65 | |
harrypowers | 0:b899fe37ce17 | 66 | ~BMP180(); // Destructor |
harrypowers | 0:b899fe37ce17 | 67 | |
harrypowers | 0:b899fe37ce17 | 68 | int readTP(long *t, long *p, int oversample); // get both temperature and pressure fully compensated values! Note this only returns when measurements are complete |
harrypowers | 0:b899fe37ce17 | 69 | |
harrypowers | 0:b899fe37ce17 | 70 | int startTemperature(); // Start temperature measurement |
harrypowers | 0:b899fe37ce17 | 71 | int readTemperature(long *t); // Get the temperature reading that was taken in startTemperature() but ensure 4.5 ms time has elapsed |
harrypowers | 0:b899fe37ce17 | 72 | int startPressure(int oversample); // Start pressure measurement! Note oversample will vary the time to complete this measurement. See defines above for oversampling constants to use! |
harrypowers | 0:b899fe37ce17 | 73 | int readPressure(long *p); // Get the pressure reading that was taken in startPressure() but ensure time for the measurement to complete |
harrypowers | 0:b899fe37ce17 | 74 | |
harrypowers | 0:b899fe37ce17 | 75 | protected: |
harrypowers | 0:b899fe37ce17 | 76 | long x1; |
harrypowers | 0:b899fe37ce17 | 77 | long x2; |
harrypowers | 0:b899fe37ce17 | 78 | long x3; |
harrypowers | 0:b899fe37ce17 | 79 | short ac1; |
harrypowers | 0:b899fe37ce17 | 80 | short ac2; |
harrypowers | 0:b899fe37ce17 | 81 | short ac3; |
harrypowers | 0:b899fe37ce17 | 82 | unsigned short ac4; |
harrypowers | 0:b899fe37ce17 | 83 | unsigned short ac5; |
harrypowers | 0:b899fe37ce17 | 84 | unsigned short ac6; |
harrypowers | 0:b899fe37ce17 | 85 | short b1; |
harrypowers | 0:b899fe37ce17 | 86 | short b2; |
harrypowers | 0:b899fe37ce17 | 87 | long b3; |
harrypowers | 0:b899fe37ce17 | 88 | unsigned long b4; |
harrypowers | 0:b899fe37ce17 | 89 | long b5; |
harrypowers | 0:b899fe37ce17 | 90 | long b6; |
harrypowers | 0:b899fe37ce17 | 91 | unsigned long b7; |
harrypowers | 0:b899fe37ce17 | 92 | short mb; |
harrypowers | 0:b899fe37ce17 | 93 | short mc; |
harrypowers | 0:b899fe37ce17 | 94 | short md; |
harrypowers | 0:b899fe37ce17 | 95 | int oversampling_setting; |
harrypowers | 0:b899fe37ce17 | 96 | char rReg[3]; |
harrypowers | 0:b899fe37ce17 | 97 | char wReg[2]; |
harrypowers | 0:b899fe37ce17 | 98 | char cmd; |
harrypowers | 0:b899fe37ce17 | 99 | char data[EEprom]; |
harrypowers | 0:b899fe37ce17 | 100 | char w[2]; |
harrypowers | 0:b899fe37ce17 | 101 | |
harrypowers | 0:b899fe37ce17 | 102 | I2C bmp180i2c; // the I2C class for this bmp180 communication. |
harrypowers | 0:b899fe37ce17 | 103 | //int rTemp(long *ut); // raw temperature reading. Note this returns when reading is done. |
harrypowers | 0:b899fe37ce17 | 104 | //int rPressure(long *up); // raw pressure reading. Note this returns when reading is done. |
harrypowers | 0:b899fe37ce17 | 105 | }; |
harrypowers | 0:b899fe37ce17 | 106 | |
harrypowers | 0:b899fe37ce17 | 107 | #endif |