Maxim Integrated / Mbed OS HSP_RPC_GUI

MAX32620HSP (MAXREFDES100) RPC Example for Graphical User Interface

Dependencies:   USBDevice

Fork of HSP_Release by Jerry Bradshaw

This is an example program for the MAX32620HSP (MAXREFDES100 Health Sensor Platform). It demonstrates all the features of the platform and works with a companion graphical user interface (GUI) to help evaluate/configure/monitor the board. Go to the MAXREFDES100 product page and click on "design resources" to download the companion software. The GUI connects to the board through an RPC interface on a virtual serial port over the USB interface.

The RPC interface provides access to all the features of the board and is available to interface with other development environments such Matlab. This firmware provides realtime data streaming through the RPC interface over USB, and also provides the ability to log the data to flash for untethered battery operation. The data logging settings are configured through the GUI, and the GUI also provides the interface to download logged data.

Details on the RPC interface can be found here: HSP RPC Interface Documentation

Windows

With this program loaded, the MAX32620HSP will appear on your computer as a serial port. On Mac and Linux, this will happen by default. For Windows, you need to install a driver: HSP serial port windows driver

For more details about this platform and how to use it, see the MAXREFDES100 product page.

HSP/Devices/BMP280/BMP280/BMP280.cpp@0:e4a10ed6eb92, 2016-10-25 (annotated)

Committer:
jbradshaw
Date:
Tue Oct 25 15:22:11 2016 +0000
Revision:
0:e4a10ed6eb92
Child:
1:9490836294ea
tewt

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jbradshaw 0:e4a10ed6eb92 1 /*******************************************************************************
jbradshaw 0:e4a10ed6eb92 2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
jbradshaw 0:e4a10ed6eb92 3 *
jbradshaw 0:e4a10ed6eb92 4 * Permission is hereby granted, free of charge, to any person obtaining a
jbradshaw 0:e4a10ed6eb92 5 * copy of this software and associated documentation files (the "Software"),
jbradshaw 0:e4a10ed6eb92 6 * to deal in the Software without restriction, including without limitation
jbradshaw 0:e4a10ed6eb92 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
jbradshaw 0:e4a10ed6eb92 8 * and/or sell copies of the Software, and to permit persons to whom the
jbradshaw 0:e4a10ed6eb92 9 * Software is furnished to do so, subject to the following conditions:
jbradshaw 0:e4a10ed6eb92 10 *
jbradshaw 0:e4a10ed6eb92 11 * The above copyright notice and this permission notice shall be included
jbradshaw 0:e4a10ed6eb92 12 * in all copies or substantial portions of the Software.
jbradshaw 0:e4a10ed6eb92 13 *
jbradshaw 0:e4a10ed6eb92 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
jbradshaw 0:e4a10ed6eb92 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
jbradshaw 0:e4a10ed6eb92 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
jbradshaw 0:e4a10ed6eb92 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
jbradshaw 0:e4a10ed6eb92 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
jbradshaw 0:e4a10ed6eb92 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
jbradshaw 0:e4a10ed6eb92 20 * OTHER DEALINGS IN THE SOFTWARE.
jbradshaw 0:e4a10ed6eb92 21 *
jbradshaw 0:e4a10ed6eb92 22 * Except as contained in this notice, the name of Maxim Integrated
jbradshaw 0:e4a10ed6eb92 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
jbradshaw 0:e4a10ed6eb92 24 * Products, Inc. Branding Policy.
jbradshaw 0:e4a10ed6eb92 25 *
jbradshaw 0:e4a10ed6eb92 26 * The mere transfer of this software does not imply any licenses
jbradshaw 0:e4a10ed6eb92 27 * of trade secrets, proprietary technology, copyrights, patents,
jbradshaw 0:e4a10ed6eb92 28 * trademarks, maskwork rights, or any other form of intellectual
jbradshaw 0:e4a10ed6eb92 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
jbradshaw 0:e4a10ed6eb92 30 * ownership rights.
jbradshaw 0:e4a10ed6eb92 31 *******************************************************************************
jbradshaw 0:e4a10ed6eb92 32 */
jbradshaw 0:e4a10ed6eb92 33
jbradshaw 0:e4a10ed6eb92 34
jbradshaw 0:e4a10ed6eb92 35 #include "mbed.h"
jbradshaw 0:e4a10ed6eb92 36 #include "BMP280.h"
jbradshaw 0:e4a10ed6eb92 37
jbradshaw 0:e4a10ed6eb92 38 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 39 BMP280::BMP280(PinName sda, PinName scl, int slaveAddress) :
jbradshaw 0:e4a10ed6eb92 40 slaveAddress(slaveAddress) {
jbradshaw 0:e4a10ed6eb92 41 i2c = new I2C(sda, scl);
jbradshaw 0:e4a10ed6eb92 42 isOwner = true;
jbradshaw 0:e4a10ed6eb92 43 }
jbradshaw 0:e4a10ed6eb92 44 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 45 BMP280::BMP280(I2C *i2c, int slaveAddress) :
jbradshaw 0:e4a10ed6eb92 46 slaveAddress(slaveAddress) {
jbradshaw 0:e4a10ed6eb92 47 this->i2c = i2c;
jbradshaw 0:e4a10ed6eb92 48 isOwner = false;
jbradshaw 0:e4a10ed6eb92 49
jbradshaw 0:e4a10ed6eb92 50 i2c->frequency(100000);
jbradshaw 0:e4a10ed6eb92 51 loggingEnabled = 0;
jbradshaw 0:e4a10ed6eb92 52 loggingSampleRate = 5;
jbradshaw 0:e4a10ed6eb92 53 }
jbradshaw 0:e4a10ed6eb92 54 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 55 BMP280::~BMP280(void) {
jbradshaw 0:e4a10ed6eb92 56 if (isOwner == true) {
jbradshaw 0:e4a10ed6eb92 57 delete i2c;
jbradshaw 0:e4a10ed6eb92 58 }
jbradshaw 0:e4a10ed6eb92 59 }
jbradshaw 0:e4a10ed6eb92 60
jbradshaw 0:e4a10ed6eb92 61 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 62 int BMP280::init(BMP280::bmp280_osrs_P_t Osrs_p, BMP280::bmp280_osrs_T_t Osrs_t,
jbradshaw 0:e4a10ed6eb92 63 BMP280::bmp280_FILT_t Filter, BMP280::bmp280_MODE_t Mode,
jbradshaw 0:e4a10ed6eb92 64 BMP280::bmp280_TSB_t T_sb)
jbradshaw 0:e4a10ed6eb92 65
jbradshaw 0:e4a10ed6eb92 66 {
jbradshaw 0:e4a10ed6eb92 67 char reg;
jbradshaw 0:e4a10ed6eb92 68 char raw_Tn[6];
jbradshaw 0:e4a10ed6eb92 69 char raw_Pn[20];
jbradshaw 0:e4a10ed6eb92 70
jbradshaw 0:e4a10ed6eb92 71 // Read all the temp coeffecients from the BMP280 memory. It will be used in
jbradshaw 0:e4a10ed6eb92 72 // calculation
jbradshaw 0:e4a10ed6eb92 73 reg = 0x88;
jbradshaw 0:e4a10ed6eb92 74 if (reg_read(reg, raw_Tn, 6) != 0) {
jbradshaw 0:e4a10ed6eb92 75 return -1;
jbradshaw 0:e4a10ed6eb92 76 }
jbradshaw 0:e4a10ed6eb92 77
jbradshaw 0:e4a10ed6eb92 78 dig_T1 = (((uint16_t)raw_Tn[1]) << 8) | raw_Tn[0];
jbradshaw 0:e4a10ed6eb92 79 dig_T2 = (((int16_t)raw_Tn[3]) << 8) | raw_Tn[2];
jbradshaw 0:e4a10ed6eb92 80 dig_T3 = (((int16_t)raw_Tn[5]) << 8) | raw_Tn[4];
jbradshaw 0:e4a10ed6eb92 81
jbradshaw 0:e4a10ed6eb92 82 // Read all the press coeffecients from the BMP280 memory. It will be used in
jbradshaw 0:e4a10ed6eb92 83 // calculation
jbradshaw 0:e4a10ed6eb92 84 reg = 0x8E;
jbradshaw 0:e4a10ed6eb92 85 if (reg_read(reg, raw_Pn, 20) != 0) {
jbradshaw 0:e4a10ed6eb92 86 return -1;
jbradshaw 0:e4a10ed6eb92 87 }
jbradshaw 0:e4a10ed6eb92 88
jbradshaw 0:e4a10ed6eb92 89 dig_P1 = (((uint16_t)raw_Pn[1]) << 8) | raw_Pn[0];
jbradshaw 0:e4a10ed6eb92 90 dig_P2 = (((int16_t)raw_Pn[3]) << 8) | raw_Pn[2];
jbradshaw 0:e4a10ed6eb92 91 dig_P3 = (((int16_t)raw_Pn[5]) << 8) | raw_Pn[4];
jbradshaw 0:e4a10ed6eb92 92 dig_P4 = (((int16_t)raw_Pn[7]) << 8) | raw_Pn[6];
jbradshaw 0:e4a10ed6eb92 93 dig_P5 = (((int16_t)raw_Pn[9]) << 8) | raw_Pn[8];
jbradshaw 0:e4a10ed6eb92 94 dig_P6 = (((int16_t)raw_Pn[11]) << 8) | raw_Pn[10];
jbradshaw 0:e4a10ed6eb92 95 dig_P7 = (((int16_t)raw_Pn[13]) << 8) | raw_Pn[12];
jbradshaw 0:e4a10ed6eb92 96 dig_P8 = (((int16_t)raw_Pn[15]) << 8) | raw_Pn[14];
jbradshaw 0:e4a10ed6eb92 97 dig_P9 = (((int16_t)raw_Pn[17]) << 8) | raw_Pn[16];
jbradshaw 0:e4a10ed6eb92 98
jbradshaw 0:e4a10ed6eb92 99
jbradshaw 0:e4a10ed6eb92 100 wait(1.0 / 10.0);
jbradshaw 0:e4a10ed6eb92 101
jbradshaw 0:e4a10ed6eb92 102 /****/
jbradshaw 0:e4a10ed6eb92 103 if (reg_read(BMP280_CTRL_MEAS, &bmp280_ctrl_meas.all, 1) != 0) {
jbradshaw 0:e4a10ed6eb92 104 return -1;
jbradshaw 0:e4a10ed6eb92 105 }
jbradshaw 0:e4a10ed6eb92 106
jbradshaw 0:e4a10ed6eb92 107 bmp280_ctrl_meas.bit.osrs_p = Osrs_p;
jbradshaw 0:e4a10ed6eb92 108 bmp280_ctrl_meas.bit.osrs_t = Osrs_t;
jbradshaw 0:e4a10ed6eb92 109
jbradshaw 0:e4a10ed6eb92 110 bmp280_ctrl_meas.bit.mode = Mode;
jbradshaw 0:e4a10ed6eb92 111
jbradshaw 0:e4a10ed6eb92 112 if (reg_write(BMP280_CTRL_MEAS, bmp280_ctrl_meas.all) != 0) {
jbradshaw 0:e4a10ed6eb92 113 return -1;
jbradshaw 0:e4a10ed6eb92 114 }
jbradshaw 0:e4a10ed6eb92 115
jbradshaw 0:e4a10ed6eb92 116 /****/
jbradshaw 0:e4a10ed6eb92 117
jbradshaw 0:e4a10ed6eb92 118 if (reg_read(BMP280_CONFIG, &bmp280_config.all, 1) != 0) {
jbradshaw 0:e4a10ed6eb92 119 return -1;
jbradshaw 0:e4a10ed6eb92 120 }
jbradshaw 0:e4a10ed6eb92 121
jbradshaw 0:e4a10ed6eb92 122 bmp280_config.bit.filter = Filter;
jbradshaw 0:e4a10ed6eb92 123
jbradshaw 0:e4a10ed6eb92 124 if (Mode == 0b11) {
jbradshaw 0:e4a10ed6eb92 125 bmp280_config.bit.t_sb = T_sb;
jbradshaw 0:e4a10ed6eb92 126 }
jbradshaw 0:e4a10ed6eb92 127
jbradshaw 0:e4a10ed6eb92 128 if (reg_write(BMP280_CONFIG, bmp280_config.all) != 0) {
jbradshaw 0:e4a10ed6eb92 129 return -1;
jbradshaw 0:e4a10ed6eb92 130 }
jbradshaw 0:e4a10ed6eb92 131
jbradshaw 0:e4a10ed6eb92 132 return 0;
jbradshaw 0:e4a10ed6eb92 133 }
jbradshaw 0:e4a10ed6eb92 134
jbradshaw 0:e4a10ed6eb92 135 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 136 float BMP280::ToFahrenheit(float temperature) {
jbradshaw 0:e4a10ed6eb92 137 return temperature * 9 / 5 + 32;
jbradshaw 0:e4a10ed6eb92 138 }
jbradshaw 0:e4a10ed6eb92 139
jbradshaw 0:e4a10ed6eb92 140 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 141 int BMP280::ReadCompDataRaw2(char *bmp280_rawData) {
jbradshaw 0:e4a10ed6eb92 142 int i;
jbradshaw 0:e4a10ed6eb92 143 char data[6];
jbradshaw 0:e4a10ed6eb92 144 float temp;
jbradshaw 0:e4a10ed6eb92 145 float pressure;
jbradshaw 0:e4a10ed6eb92 146 int iPressure;
jbradshaw 0:e4a10ed6eb92 147 char str[32];
jbradshaw 0:e4a10ed6eb92 148 ReadCompDataRaw(data);
jbradshaw 0:e4a10ed6eb92 149 ToFloat(data, &temp, &pressure);
jbradshaw 0:e4a10ed6eb92 150 iPressure = (int)pressure;
jbradshaw 0:e4a10ed6eb92 151 sprintf(str, "%d ", iPressure);
jbradshaw 0:e4a10ed6eb92 152 for (i = 0; i < 6; i++) {
jbradshaw 0:e4a10ed6eb92 153 bmp280_rawData[i] = str[i];
jbradshaw 0:e4a10ed6eb92 154 }
jbradshaw 0:e4a10ed6eb92 155 return 0;
jbradshaw 0:e4a10ed6eb92 156 }
jbradshaw 0:e4a10ed6eb92 157
jbradshaw 0:e4a10ed6eb92 158 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 159 int BMP280::ReadCompDataRaw(char *bmp280_rawData) {
jbradshaw 0:e4a10ed6eb92 160 char reg;
jbradshaw 0:e4a10ed6eb92 161 char rxbytes;
jbradshaw 0:e4a10ed6eb92 162
jbradshaw 0:e4a10ed6eb92 163 reg = BMP280_PRESS_MSB;
jbradshaw 0:e4a10ed6eb92 164 rxbytes = 6;
jbradshaw 0:e4a10ed6eb92 165
jbradshaw 0:e4a10ed6eb92 166 if (reg_read(reg, bmp280_rawData, rxbytes) != 0) {
jbradshaw 0:e4a10ed6eb92 167 return -1;
jbradshaw 0:e4a10ed6eb92 168 }
jbradshaw 0:e4a10ed6eb92 169 return 0;
jbradshaw 0:e4a10ed6eb92 170 }
jbradshaw 0:e4a10ed6eb92 171
jbradshaw 0:e4a10ed6eb92 172 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 173 void BMP280::ToFloat(char *bmp280_rawData, float *Temp_degC, float *Press_Pa) {
jbradshaw 0:e4a10ed6eb92 174 bmp280_rawPress = (uint32_t)(bmp280_rawData[0] << 12) |
jbradshaw 0:e4a10ed6eb92 175 (bmp280_rawData[1] << 4) | (bmp280_rawData[2] >> 4);
jbradshaw 0:e4a10ed6eb92 176
jbradshaw 0:e4a10ed6eb92 177 bmp280_rawTemp = (uint32_t)(bmp280_rawData[3] << 12) |
jbradshaw 0:e4a10ed6eb92 178 (bmp280_rawData[4] << 4) | (bmp280_rawData[5] >> 4);
jbradshaw 0:e4a10ed6eb92 179
jbradshaw 0:e4a10ed6eb92 180 *Temp_degC = compensate_T_float(bmp280_rawTemp);
jbradshaw 0:e4a10ed6eb92 181 *Press_Pa = compensate_P_float(bmp280_rawPress);
jbradshaw 0:e4a10ed6eb92 182 }
jbradshaw 0:e4a10ed6eb92 183
jbradshaw 0:e4a10ed6eb92 184 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 185 int BMP280::ReadCompData(float *Temp_degC, float *Press_Pa) {
jbradshaw 0:e4a10ed6eb92 186 char bmp280_rawData[6];
jbradshaw 0:e4a10ed6eb92 187
jbradshaw 0:e4a10ed6eb92 188 if (ReadCompDataRaw(bmp280_rawData) != 0) {
jbradshaw 0:e4a10ed6eb92 189 return -1;
jbradshaw 0:e4a10ed6eb92 190 }
jbradshaw 0:e4a10ed6eb92 191 ToFloat(bmp280_rawData, Temp_degC, Press_Pa);
jbradshaw 0:e4a10ed6eb92 192 return 0;
jbradshaw 0:e4a10ed6eb92 193 }
jbradshaw 0:e4a10ed6eb92 194
jbradshaw 0:e4a10ed6eb92 195 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 196 int BMP280::reg_write(char reg, char value) {
jbradshaw 0:e4a10ed6eb92 197 int result;
jbradshaw 0:e4a10ed6eb92 198 char cmdData[2] = {(char)reg, value};
jbradshaw 0:e4a10ed6eb92 199 result = i2c->write(slaveAddress, cmdData, 2);
jbradshaw 0:e4a10ed6eb92 200 if (result != 0)
jbradshaw 0:e4a10ed6eb92 201 return -1;
jbradshaw 0:e4a10ed6eb92 202 return 0;
jbradshaw 0:e4a10ed6eb92 203 }
jbradshaw 0:e4a10ed6eb92 204
jbradshaw 0:e4a10ed6eb92 205 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 206 int BMP280::reg_read(char reg, char *value, char number) {
jbradshaw 0:e4a10ed6eb92 207 int result;
jbradshaw 0:e4a10ed6eb92 208 char cmdData[1] = {(char)reg};
jbradshaw 0:e4a10ed6eb92 209
jbradshaw 0:e4a10ed6eb92 210 result = i2c->write(slaveAddress, cmdData, 1);
jbradshaw 0:e4a10ed6eb92 211 if (result != 0)
jbradshaw 0:e4a10ed6eb92 212 return -1;
jbradshaw 0:e4a10ed6eb92 213 result = i2c->read(slaveAddress, value, number);
jbradshaw 0:e4a10ed6eb92 214 if (result != 0)
jbradshaw 0:e4a10ed6eb92 215 return -1;
jbradshaw 0:e4a10ed6eb92 216 return 0;
jbradshaw 0:e4a10ed6eb92 217 }
jbradshaw 0:e4a10ed6eb92 218
jbradshaw 0:e4a10ed6eb92 219 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 220 int BMP280::Sleep(void) {
jbradshaw 0:e4a10ed6eb92 221 // Configure the I2C interface
jbradshaw 0:e4a10ed6eb92 222
jbradshaw 0:e4a10ed6eb92 223 if (reg_read(BMP280_CTRL_MEAS, &bmp280_ctrl_meas.all, 1) != 0) {
jbradshaw 0:e4a10ed6eb92 224 return -1;
jbradshaw 0:e4a10ed6eb92 225 }
jbradshaw 0:e4a10ed6eb92 226 bmp280_ctrl_meas.bit.mode = 0b00; // put everything to sleep mode...
jbradshaw 0:e4a10ed6eb92 227
jbradshaw 0:e4a10ed6eb92 228 if (reg_write(BMP280_CTRL_MEAS, bmp280_ctrl_meas.all) != 0) {
jbradshaw 0:e4a10ed6eb92 229 return -1;
jbradshaw 0:e4a10ed6eb92 230 }
jbradshaw 0:e4a10ed6eb92 231 return 0;
jbradshaw 0:e4a10ed6eb92 232 }
jbradshaw 0:e4a10ed6eb92 233
jbradshaw 0:e4a10ed6eb92 234 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 235 void BMP280::Reset(void) {
jbradshaw 0:e4a10ed6eb92 236 reg_write(BMP280_RESET, 0xB6); // Initiate a Soft Reset
jbradshaw 0:e4a10ed6eb92 237 }
jbradshaw 0:e4a10ed6eb92 238
jbradshaw 0:e4a10ed6eb92 239 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 240 int BMP280::Detect(void) {
jbradshaw 0:e4a10ed6eb92 241 if (reg_read(BMP280_ID, &bmp280_id, 1) != 0) {
jbradshaw 0:e4a10ed6eb92 242 return -1;
jbradshaw 0:e4a10ed6eb92 243 }
jbradshaw 0:e4a10ed6eb92 244
jbradshaw 0:e4a10ed6eb92 245 if (bmp280_id == 0x58) {
jbradshaw 0:e4a10ed6eb92 246 return 1;
jbradshaw 0:e4a10ed6eb92 247 }
jbradshaw 0:e4a10ed6eb92 248 return 0;
jbradshaw 0:e4a10ed6eb92 249 }
jbradshaw 0:e4a10ed6eb92 250
jbradshaw 0:e4a10ed6eb92 251 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 252 int BMP280::ReadId(void) {
jbradshaw 0:e4a10ed6eb92 253 if (reg_read(BMP280_ID, &bmp280_id, 1) != 0) {
jbradshaw 0:e4a10ed6eb92 254 return -1;
jbradshaw 0:e4a10ed6eb92 255 }
jbradshaw 0:e4a10ed6eb92 256 return bmp280_id;
jbradshaw 0:e4a10ed6eb92 257 }
jbradshaw 0:e4a10ed6eb92 258
jbradshaw 0:e4a10ed6eb92 259 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 260 float BMP280::compensate_T_float(int32_t adc_T) {
jbradshaw 0:e4a10ed6eb92 261 float var1, var2, T;
jbradshaw 0:e4a10ed6eb92 262 var1 =
jbradshaw 0:e4a10ed6eb92 263 (((float)adc_T) / 16384.0 - ((float)dig_T1) / 1024.0) * ((float)dig_T2);
jbradshaw 0:e4a10ed6eb92 264
jbradshaw 0:e4a10ed6eb92 265 var2 = ((((float)adc_T) / 131072.0 - ((float)dig_T1) / 8192.0) *
jbradshaw 0:e4a10ed6eb92 266 (((float)adc_T) / 131072.0 - ((float)dig_T1) / 8192.0)) *
jbradshaw 0:e4a10ed6eb92 267 ((float)dig_T3);
jbradshaw 0:e4a10ed6eb92 268
jbradshaw 0:e4a10ed6eb92 269 t_fine = (int32_t)(var1 + var2);
jbradshaw 0:e4a10ed6eb92 270
jbradshaw 0:e4a10ed6eb92 271 T = (var1 + var2) / 5120.0;
jbradshaw 0:e4a10ed6eb92 272
jbradshaw 0:e4a10ed6eb92 273 return T;
jbradshaw 0:e4a10ed6eb92 274 }
jbradshaw 0:e4a10ed6eb92 275
jbradshaw 0:e4a10ed6eb92 276 //******************************************************************************
jbradshaw 0:e4a10ed6eb92 277 float BMP280::compensate_P_float(int32_t adc_P) {
jbradshaw 0:e4a10ed6eb92 278 float var1, var2, p;
jbradshaw 0:e4a10ed6eb92 279 var1 = ((float)t_fine / 2.0) - 64000.0;
jbradshaw 0:e4a10ed6eb92 280 var2 = var1 * var1 * ((float)dig_P6) / 32768.0;
jbradshaw 0:e4a10ed6eb92 281 var2 = var2 + var1 * ((float)dig_P5) * 2.0;
jbradshaw 0:e4a10ed6eb92 282 var2 = (var2 / 4.0) + (((float)dig_P4) * 65536.0);
jbradshaw 0:e4a10ed6eb92 283 var1 = (((float)dig_P3) * var1 * var1 / 524288.0 + ((float)dig_P2) * var1) / 524288.0;
jbradshaw 0:e4a10ed6eb92 284 var1 = (1.0 + var1 / 32768.0) * ((float)dig_P1);
jbradshaw 0:e4a10ed6eb92 285 if (var1 == 0.0) {
jbradshaw 0:e4a10ed6eb92 286 return 0; // avoid exception caused by division by zero
jbradshaw 0:e4a10ed6eb92 287 }
jbradshaw 0:e4a10ed6eb92 288 p = 1048576.0 - (float)adc_P;
jbradshaw 0:e4a10ed6eb92 289 p = (p - (var2 / 4096.0)) * 6250.0 / var1;
jbradshaw 0:e4a10ed6eb92 290 var1 = ((float)dig_P9) * p * p / 2147483648.0;
jbradshaw 0:e4a10ed6eb92 291 var2 = p * ((float)dig_P8) / 32768.0;
jbradshaw 0:e4a10ed6eb92 292 p = p + (var1 + var2 + ((float)dig_P7)) / 16.0;
jbradshaw 0:e4a10ed6eb92 293 return p;
jbradshaw 0:e4a10ed6eb92 294 }