Kevin Braun / ms5611

High resolution barometer and altimeter using i2c mode

Dependents:   upverter_fitbit_clone ReadingMag_HMC5883L_work

ms5611.cpp@12:e9a90b8c8688, 2016-11-11 (annotated)

Committer:
loopsva
Date:
Fri Nov 11 18:13:36 2016 +0000
Revision:
12:e9a90b8c8688
Parent:
11:e0417b67a4b5 
Intermediate v11 to v12 so top program can be comitted

Who changed what in which revision?

UserRevisionLine numberNew contents of line
loopsva 0:f97f410d4a21 1 //!
loopsva 0:f97f410d4a21 2 //! @file an520_I2C.c,v
loopsva 0:f97f410d4a21 3 //!
loopsva 0:f97f410d4a21 4 //! Copyright (c) 2009 MEAS Switzerland
loopsva 0:f97f410d4a21 5 //!
loopsva 0:f97f410d4a21 6 //!
loopsva 0:f97f410d4a21 7 //!
loopsva 0:f97f410d4a21 8 //! @brief This C code is for starter reference only. It is written for the
loopsva 0:f97f410d4a21 9 //! MEAS Switzerland MS56xx pressure sensor modules and Atmel Atmega644p
loopsva 0:f97f410d4a21 10 //! microcontroller.
loopsva 0:f97f410d4a21 11 //!
loopsva 0:f97f410d4a21 12 //! @version 1.0 $Id: an520_I2C.c,v 1.0
loopsva 0:f97f410d4a21 13 //!
loopsva 0:f97f410d4a21 14 //! @todo
loopsva 0:f97f410d4a21 15
loopsva 0:f97f410d4a21 16 #include "mbed.h"
loopsva 0:f97f410d4a21 17 #include "ms5611.h"
loopsva 0:f97f410d4a21 18
loopsva 5:0d7b229474c6 19 double P; // compensated pressure value (mB)
loopsva 5:0d7b229474c6 20 double T; // compensated temperature value (degC)
loopsva 5:0d7b229474c6 21 double A; // altitude (ft)
loopsva 5:0d7b229474c6 22 double S; // sea level barometer (mB)
loopsva 2:05804ed70748 23
loopsva 12:e9a90b8c8688 24 //uint32_t C[8]; //coefficient storage
loopsva 2:05804ed70748 25
loopsva 0:f97f410d4a21 26 //--------------------------------------------------------------------------------------------------------------------------------------//
loopsva 7:90ee2168baa7 27 // Constructor and destructor - default to be compatible with legacy m5611 driver
loopsva 0:f97f410d4a21 28
loopsva 0:f97f410d4a21 29 ms5611::ms5611(PinName sda, PinName scl) : _i2c(sda, scl) {
loopsva 6:41c370fa1f7b 30 _i2c.frequency(400000);
loopsva 7:90ee2168baa7 31 _i2cWAddr = MS5611_ADDR_W;
loopsva 7:90ee2168baa7 32 _i2cRAddr = MS5611_ADDR_R;
loopsva 7:90ee2168baa7 33 }
loopsva 7:90ee2168baa7 34
loopsva 7:90ee2168baa7 35 //--------------------------------------------------------------------------------------------------------------------------------------//
loopsva 7:90ee2168baa7 36 // Constructor and destructor - new, to allow for user to select i2c address based on CSB pin
loopsva 7:90ee2168baa7 37
loopsva 7:90ee2168baa7 38 ms5611::ms5611(PinName sda, PinName scl, CSBpolarity CSBpin) : _i2c(sda, scl) {
loopsva 7:90ee2168baa7 39 _i2c.frequency(400000);
loopsva 7:90ee2168baa7 40 _i2cWAddr = MS5611_ADDR_W;
loopsva 7:90ee2168baa7 41 _i2cRAddr = MS5611_ADDR_R;
loopsva 7:90ee2168baa7 42 if(CSBpin == CSBpin_1) {
loopsva 7:90ee2168baa7 43 _i2cWAddr -= 2;
loopsva 7:90ee2168baa7 44 _i2cRAddr -= 2;
loopsva 7:90ee2168baa7 45
loopsva 7:90ee2168baa7 46 }
loopsva 0:f97f410d4a21 47 }
loopsva 0:f97f410d4a21 48
loopsva 0:f97f410d4a21 49 //********************************************************
loopsva 0:f97f410d4a21 50 //! @brief send I2C start condition and the address byte
loopsva 0:f97f410d4a21 51 //!
loopsva 0:f97f410d4a21 52 //! @return 0
loopsva 0:f97f410d4a21 53 //********************************************************
loopsva 0:f97f410d4a21 54
loopsva 11:e0417b67a4b5 55 int32_t ms5611::m_i2c_start(bool readMode) {
loopsva 11:e0417b67a4b5 56 int32_t twst;
loopsva 0:f97f410d4a21 57 _i2c.start();
loopsva 0:f97f410d4a21 58 if(readMode == true) {
loopsva 7:90ee2168baa7 59 twst = m_i2c_write(_i2cRAddr);
loopsva 0:f97f410d4a21 60 } else {
loopsva 7:90ee2168baa7 61 twst = m_i2c_write(_i2cWAddr);
loopsva 0:f97f410d4a21 62 }
loopsva 0:f97f410d4a21 63 return(twst);
loopsva 0:f97f410d4a21 64 }
loopsva 0:f97f410d4a21 65
loopsva 0:f97f410d4a21 66 //********************************************************
loopsva 0:f97f410d4a21 67 //! @brief send I2C stop condition
loopsva 0:f97f410d4a21 68 //!
loopsva 0:f97f410d4a21 69 //! @return none
loopsva 0:f97f410d4a21 70 //********************************************************
loopsva 0:f97f410d4a21 71
loopsva 11:e0417b67a4b5 72 void ms5611::m_i2c_stop() {
loopsva 0:f97f410d4a21 73 _i2c.stop();
loopsva 0:f97f410d4a21 74 }
loopsva 0:f97f410d4a21 75
loopsva 0:f97f410d4a21 76 //********************************************************
loopsva 0:f97f410d4a21 77 //! @brief send I2C stop condition
loopsva 0:f97f410d4a21 78 //!
loopsva 0:f97f410d4a21 79 //! @return remote ack status
loopsva 0:f97f410d4a21 80 //********************************************************
loopsva 0:f97f410d4a21 81
loopsva 11:e0417b67a4b5 82 uint8_t ms5611::m_i2c_write(uint8_t data) {
loopsva 11:e0417b67a4b5 83 uint8_t twst = _i2c.write(data);
loopsva 0:f97f410d4a21 84 return(twst);
loopsva 0:f97f410d4a21 85 }
loopsva 0:f97f410d4a21 86
loopsva 0:f97f410d4a21 87 //********************************************************
loopsva 0:f97f410d4a21 88 //! @brief read I2C byte with acknowledgment
loopsva 0:f97f410d4a21 89 //!
loopsva 0:f97f410d4a21 90 //! @return read byte
loopsva 0:f97f410d4a21 91 //********************************************************
loopsva 0:f97f410d4a21 92
loopsva 11:e0417b67a4b5 93 uint8_t ms5611::m_i2c_readAck() {
loopsva 11:e0417b67a4b5 94 uint8_t twst = _i2c.read(1);
loopsva 0:f97f410d4a21 95 return(twst);
loopsva 0:f97f410d4a21 96 }
loopsva 0:f97f410d4a21 97
loopsva 0:f97f410d4a21 98 //********************************************************
loopsva 0:f97f410d4a21 99 //! @brief read I2C byte without acknowledgment
loopsva 0:f97f410d4a21 100 //!
loopsva 0:f97f410d4a21 101 //! @return read byte
loopsva 0:f97f410d4a21 102 //********************************************************
loopsva 0:f97f410d4a21 103
loopsva 11:e0417b67a4b5 104 uint8_t ms5611::m_i2c_readNak() {
loopsva 11:e0417b67a4b5 105 uint8_t twst = _i2c.read(0);
loopsva 0:f97f410d4a21 106 return(twst);
loopsva 0:f97f410d4a21 107 }
loopsva 0:f97f410d4a21 108
loopsva 0:f97f410d4a21 109 //********************************************************
loopsva 0:f97f410d4a21 110 //! @brief send command using I2C hardware interface
loopsva 0:f97f410d4a21 111 //!
loopsva 0:f97f410d4a21 112 //! @return none
loopsva 0:f97f410d4a21 113 //********************************************************
loopsva 0:f97f410d4a21 114
loopsva 11:e0417b67a4b5 115 void ms5611::m_i2c_send(uint8_t cmd) {
loopsva 11:e0417b67a4b5 116 uint8_t ret;
loopsva 2:05804ed70748 117 ret = m_i2c_start(false);
loopsva 2:05804ed70748 118 if(!(ret)) {
loopsva 0:f97f410d4a21 119 m_i2c_stop();
loopsva 2:05804ed70748 120 } else {
loopsva 0:f97f410d4a21 121 ret = m_i2c_write(cmd);
loopsva 0:f97f410d4a21 122 m_i2c_stop();
loopsva 0:f97f410d4a21 123 }
loopsva 0:f97f410d4a21 124 }
loopsva 0:f97f410d4a21 125
loopsva 0:f97f410d4a21 126 //********************************************************
loopsva 0:f97f410d4a21 127 //! @brief send reset sequence
loopsva 0:f97f410d4a21 128 //!
loopsva 0:f97f410d4a21 129 //! @return none
loopsva 0:f97f410d4a21 130 //********************************************************
loopsva 0:f97f410d4a21 131
loopsva 0:f97f410d4a21 132 void ms5611::cmd_reset() {
loopsva 8:461f68bc94f2 133 #if defined MS5611i2cLOWLEVEL
loopsva 2:05804ed70748 134 m_i2c_send(MS5611_CMD_RESET);
loopsva 8:461f68bc94f2 135 #else
loopsva 8:461f68bc94f2 136 cobuf[0] = MS5611_CMD_RESET;
loopsva 8:461f68bc94f2 137 _i2c.write(_i2cWAddr, cobuf, 1, false);
loopsva 8:461f68bc94f2 138 #endif
loopsva 2:05804ed70748 139 wait_ms(4);
loopsva 0:f97f410d4a21 140 loadCoefs();
loopsva 0:f97f410d4a21 141 }
loopsva 0:f97f410d4a21 142
loopsva 0:f97f410d4a21 143 //********************************************************
loopsva 0:f97f410d4a21 144 //! @brief preform adc conversion
loopsva 0:f97f410d4a21 145 //!
loopsva 0:f97f410d4a21 146 //! @return 24bit result
loopsva 0:f97f410d4a21 147 //********************************************************
loopsva 0:f97f410d4a21 148
loopsva 11:e0417b67a4b5 149 uint64_t ms5611::cmd_adc(uint8_t cmd) {
loopsva 11:e0417b67a4b5 150 uint64_t temp = 0;
loopsva 11:e0417b67a4b5 151 #if defined MS5611i2cLOWLEVEL
loopsva 11:e0417b67a4b5 152 m_i2c_send(MS5611_CMD_ADC_CONV + cmd);
loopsva 11:e0417b67a4b5 153 #else
loopsva 0:f97f410d4a21 154 cobuf[0] = 0;
loopsva 0:f97f410d4a21 155 cobuf[1] = 0;
loopsva 0:f97f410d4a21 156 cobuf[2] = 0;
loopsva 8:461f68bc94f2 157 cobuf[0] = MS5611_CMD_ADC_CONV + cmd;
loopsva 8:461f68bc94f2 158 _i2c.write(_i2cWAddr, cobuf, 1, false);
loopsva 8:461f68bc94f2 159 #endif
loopsva 2:05804ed70748 160 switch (cmd & 0x0f) {
loopsva 0:f97f410d4a21 161 case MS5611_CMD_ADC_256 : wait_us(900); break;
loopsva 0:f97f410d4a21 162 case MS5611_CMD_ADC_512 : wait_ms(3); break;
loopsva 0:f97f410d4a21 163 case MS5611_CMD_ADC_1024: wait_ms(4); break;
loopsva 0:f97f410d4a21 164 case MS5611_CMD_ADC_2048: wait_ms(6); break;
loopsva 0:f97f410d4a21 165 case MS5611_CMD_ADC_4096: wait_ms(10); break;
loopsva 0:f97f410d4a21 166 }
loopsva 8:461f68bc94f2 167 #if defined MS5611i2cLOWLEVEL
loopsva 0:f97f410d4a21 168 m_i2c_send(MS5611_CMD_ADC_READ);
loopsva 11:e0417b67a4b5 169 m_i2c_start(true);
loopsva 11:e0417b67a4b5 170 temp = m_i2c_readAck();
loopsva 11:e0417b67a4b5 171 temp = (temp << 8) | m_i2c_readAck();
loopsva 11:e0417b67a4b5 172 temp = (temp << 8) | m_i2c_readNak();
loopsva 11:e0417b67a4b5 173 m_i2c_stop();
loopsva 8:461f68bc94f2 174 #else
loopsva 8:461f68bc94f2 175 cobuf[0] = MS5611_CMD_ADC_READ;
loopsva 8:461f68bc94f2 176 _i2c.write(_i2cWAddr, cobuf, 1, true);
loopsva 8:461f68bc94f2 177 cobuf[0] = 0;
loopsva 11:e0417b67a4b5 178 _i2c.read(_i2cRAddr, cobuf, 3, false);
loopsva 11:e0417b67a4b5 179 temp = (cobuf[0] << 16) | (cobuf[1] << 8) | cobuf[2];
loopsva 8:461f68bc94f2 180 #endif
loopsva 0:f97f410d4a21 181 return temp;
loopsva 0:f97f410d4a21 182 }
loopsva 0:f97f410d4a21 183
loopsva 0:f97f410d4a21 184 //********************************************************
loopsva 0:f97f410d4a21 185 //! @brief Read calibration coefficients
loopsva 0:f97f410d4a21 186 //!
loopsva 0:f97f410d4a21 187 //! @return coefficient
loopsva 0:f97f410d4a21 188 //********************************************************
loopsva 0:f97f410d4a21 189
loopsva 11:e0417b67a4b5 190 uint32_t ms5611::cmd_prom(uint8_t coef_num) {
loopsva 11:e0417b67a4b5 191 uint32_t rC = 0;
loopsva 11:e0417b67a4b5 192 #if defined MS5611i2cLOWLEVEL
loopsva 11:e0417b67a4b5 193 m_i2c_send(MS5611_CMD_PROM_RD + coef_num * 2); // send PROM READ command
loopsva 11:e0417b67a4b5 194 m_i2c_start(true);
loopsva 11:e0417b67a4b5 195 rC = m_i2c_readAck();
loopsva 11:e0417b67a4b5 196 rC = (rC << 8) | m_i2c_readNak();
loopsva 11:e0417b67a4b5 197 m_i2c_stop();
loopsva 11:e0417b67a4b5 198 #else
loopsva 0:f97f410d4a21 199 cobuf[0] = 0;
loopsva 0:f97f410d4a21 200 cobuf[1] = 0;
loopsva 8:461f68bc94f2 201 cobuf[0] = MS5611_CMD_PROM_RD + coef_num * 2;
loopsva 8:461f68bc94f2 202 _i2c.write(_i2cWAddr, cobuf, 1, true);
loopsva 8:461f68bc94f2 203 cobuf[0] = 0;
loopsva 11:e0417b67a4b5 204 _i2c.read(_i2cRAddr, cobuf, 2, false);
loopsva 11:e0417b67a4b5 205 rC = (cobuf[0] << 8) | cobuf[1];
loopsva 8:461f68bc94f2 206 #endif
loopsva 0:f97f410d4a21 207 return rC;
loopsva 0:f97f410d4a21 208 }
loopsva 0:f97f410d4a21 209
loopsva 0:f97f410d4a21 210 //********************************************************
loopsva 0:f97f410d4a21 211 //! @brief calculate the CRC code
loopsva 0:f97f410d4a21 212 //!
loopsva 0:f97f410d4a21 213 //! @return crc code
loopsva 0:f97f410d4a21 214 //********************************************************
loopsva 0:f97f410d4a21 215
loopsva 11:e0417b67a4b5 216 uint8_t ms5611::crc4(uint32_t n_prom[]) {
loopsva 11:e0417b67a4b5 217 uint32_t n_rem;
loopsva 11:e0417b67a4b5 218 uint32_t crc_read;
loopsva 11:e0417b67a4b5 219 uint8_t n_bit;
loopsva 0:f97f410d4a21 220 n_rem = 0x00;
loopsva 2:05804ed70748 221 crc_read = n_prom[7];
loopsva 2:05804ed70748 222 n_prom[7]=(0xFF00 & (n_prom[7]));
loopsva 2:05804ed70748 223 for (int cnt = 0; cnt < 16; cnt++) {
loopsva 0:f97f410d4a21 224 if (cnt%2 == 1) {
loopsva 11:e0417b67a4b5 225 n_rem ^= (uint16_t) ((n_prom[cnt>>1]) & 0x00FF);
loopsva 0:f97f410d4a21 226 } else {
loopsva 11:e0417b67a4b5 227 n_rem ^= (uint16_t) (n_prom[cnt>>1]>>8);
loopsva 0:f97f410d4a21 228 }
loopsva 0:f97f410d4a21 229 for (n_bit = 8; n_bit > 0; n_bit--) {
loopsva 0:f97f410d4a21 230 if (n_rem & (0x8000)) {
loopsva 0:f97f410d4a21 231 n_rem = (n_rem << 1) ^ 0x3000;
loopsva 0:f97f410d4a21 232 } else {
loopsva 0:f97f410d4a21 233 n_rem = (n_rem << 1);
loopsva 0:f97f410d4a21 234 }
loopsva 0:f97f410d4a21 235 }
loopsva 0:f97f410d4a21 236 }
loopsva 2:05804ed70748 237 n_rem= (0x000F & (n_rem >> 12));
loopsva 2:05804ed70748 238 n_prom[7]=crc_read;
loopsva 0:f97f410d4a21 239 return (n_rem ^ 0x0);
loopsva 2:05804ed70748 240 }
loopsva 2:05804ed70748 241
loopsva 0:f97f410d4a21 242 /*
loopsva 0:f97f410d4a21 243 The CRC code is calculated and written in factory with the LSB byte in the prom n_prom[7] set to 0x00 (see
loopsva 0:f97f410d4a21 244 Coefficient table below). It is thus important to clear those bytes from the calculation buffer before proceeding
loopsva 0:f97f410d4a21 245 with the CRC calculation itself:
loopsva 0:f97f410d4a21 246 n_prom[7]=(0xFF00 & (n_prom[7])); //CRC byte is replaced by 0
loopsva 0:f97f410d4a21 247 As a simple test of the CRC code, the following coefficient table could be used:
loopsva 11:e0417b67a4b5 248 uint32_t nprom[] = {0x3132,0x3334,0x3536,0x3738,0x3940,0x4142,0x4344,0x4500};
loopsva 0:f97f410d4a21 249 the resulting calculated CRC should be 0xB.
loopsva 0:f97f410d4a21 250
loopsva 0:f97f410d4a21 251 DB 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
loopsva 0:f97f410d4a21 252 Addr
loopsva 0:f97f410d4a21 253 0 16 bit reserved for manufacturer
loopsva 0:f97f410d4a21 254 1 Coefficient 1 (16 bit unsigned)
loopsva 0:f97f410d4a21 255 2 Coefficient 2 (16 bit unsigned)
loopsva 0:f97f410d4a21 256 3 Coefficient 3 (16 bit unsigned)
loopsva 0:f97f410d4a21 257 4 Coefficient 4 (16 bit unsigned)
loopsva 0:f97f410d4a21 258 5 Coefficient 5 (16 bit unsigned)
loopsva 0:f97f410d4a21 259 6 Coefficient 6 (16 bit unsigned)
loopsva 0:f97f410d4a21 260 7 0 0 0 0 CRC(0x0)
loopsva 0:f97f410d4a21 261 */
loopsva 0:f97f410d4a21 262 /*
loopsva 0:f97f410d4a21 263 //Returns 0x0b as per AP520_004
loopsva 2:05804ed70748 264 C[0] = 0x3132;
loopsva 2:05804ed70748 265 C[1] = 0x3334;
loopsva 2:05804ed70748 266 C[2] = 0x3536;
loopsva 2:05804ed70748 267 C[3] = 0x3738;
loopsva 2:05804ed70748 268 C[4] = 0x3940;
loopsva 2:05804ed70748 269 C[5] = 0x4142;
loopsva 2:05804ed70748 270 C[6] = 0x4344;
loopsva 2:05804ed70748 271 C[7] = 0x4546;
loopsva 0:f97f410d4a21 272 n_crc = ms.crc4(C); // calculate the CRC
loopsva 0:f97f410d4a21 273 pc.printf("testing CRC: 0x%x\n", n_crc);
loopsva 0:f97f410d4a21 274 */
loopsva 2:05804ed70748 275
loopsva 0:f97f410d4a21 276 //********************************************************
loopsva 0:f97f410d4a21 277 //! @brief load all calibration coefficients
loopsva 0:f97f410d4a21 278 //!
loopsva 0:f97f410d4a21 279 //! @return none
loopsva 0:f97f410d4a21 280 //********************************************************
loopsva 12:e9a90b8c8688 281 extern RawSerial pc;
loopsva 0:f97f410d4a21 282
loopsva 0:f97f410d4a21 283 void ms5611::loadCoefs() {
loopsva 12:e9a90b8c8688 284 pc.printf("\r\n - Coefs: ");
loopsva 0:f97f410d4a21 285 for (int i = 0; i < 8; i++){
loopsva 0:f97f410d4a21 286 wait_ms(50);
loopsva 2:05804ed70748 287 C[i] = cmd_prom(i);
loopsva 12:e9a90b8c8688 288 pc.printf("%04x ", C[i]);
loopsva 0:f97f410d4a21 289 }
loopsva 12:e9a90b8c8688 290 pc.printf("\r\n");
loopsva 11:e0417b67a4b5 291 uint8_t n_crc = crc4(C);
loopsva 0:f97f410d4a21 292 }
loopsva 0:f97f410d4a21 293
loopsva 0:f97f410d4a21 294 //********************************************************
loopsva 0:f97f410d4a21 295 //! @brief calculate temperature and pressure
loopsva 0:f97f410d4a21 296 //!
loopsva 0:f97f410d4a21 297 //! @return none
loopsva 0:f97f410d4a21 298 //********************************************************
loopsva 0:f97f410d4a21 299
loopsva 0:f97f410d4a21 300 void ms5611::calcPT() {
loopsva 2:05804ed70748 301 int32_t D2 = cmd_adc(MS5611_CMD_ADC_D2 + MS5611_CMD_ADC_4096); // read D2
loopsva 2:05804ed70748 302 int32_t D1 = cmd_adc(MS5611_CMD_ADC_D1 + MS5611_CMD_ADC_4096); // read D1
loopsva 3:c2d1b0d432ad 303 int64_t dT = D2 - ((uint64_t)C[5] << 8);
loopsva 2:05804ed70748 304 int64_t OFF = ((uint32_t)C[2] << 16) + ((dT * (C[4]) >> 7)); //was OFF = (C[2] << 17) + dT * C[4] / (1 << 6);
loopsva 2:05804ed70748 305 int64_t SENS = ((uint32_t)C[1] << 15) + ((dT * (C[3]) >> 8)); //was SENS = (C[1] << 16) + dT * C[3] / (1 << 7);
loopsva 2:05804ed70748 306 int32_t TEMP = 2000 + (int64_t)dT * (int64_t)C[6] / (int64_t)(1 << 23);
loopsva 11:e0417b67a4b5 307 T = (double) TEMP / 100.0;
loopsva 0:f97f410d4a21 308
loopsva 11:e0417b67a4b5 309 if(TEMP < 2000) { // if temperature lower than +20 Celsius
loopsva 11:e0417b67a4b5 310 int64_t T1 = ((int64_t)TEMP - 2000) * ((int64_t)TEMP - 2000);
loopsva 11:e0417b67a4b5 311 int64_t OFF1 = (5 * T1) >> 1;
loopsva 11:e0417b67a4b5 312 int64_t SENS1 = (5 * T1) >> 2;
loopsva 2:05804ed70748 313
loopsva 2:05804ed70748 314 if(TEMP < -1500) { // if temperature lower than -15 Celsius
loopsva 11:e0417b67a4b5 315 T1 = ((int64_t)TEMP + 1500) * ((int64_t)TEMP + 1500);
loopsva 11:e0417b67a4b5 316 OFF1 += 7 * T1;
loopsva 11:e0417b67a4b5 317 SENS1 += 11 * T1 >> 1;
loopsva 2:05804ed70748 318 }
loopsva 2:05804ed70748 319 OFF -= OFF1;
loopsva 2:05804ed70748 320 SENS -= SENS1;
loopsva 2:05804ed70748 321 }
loopsva 11:e0417b67a4b5 322 P = (double)(((((int64_t)D1 * SENS ) >> 21) - OFF) / (double) (1 << 15)) / 100.0;
loopsva 0:f97f410d4a21 323 }
loopsva 0:f97f410d4a21 324
loopsva 0:f97f410d4a21 325 //********************************************************
loopsva 0:f97f410d4a21 326 //! @brief calculate temperature
loopsva 0:f97f410d4a21 327 //!
loopsva 0:f97f410d4a21 328 //! @return double temperature degC
loopsva 0:f97f410d4a21 329 //********************************************************
loopsva 0:f97f410d4a21 330
loopsva 0:f97f410d4a21 331 double ms5611::calcTemp() {
loopsva 0:f97f410d4a21 332 calcPT();
loopsva 0:f97f410d4a21 333 return(T);
loopsva 0:f97f410d4a21 334 }
loopsva 0:f97f410d4a21 335
loopsva 0:f97f410d4a21 336 //********************************************************
loopsva 3:c2d1b0d432ad 337 //! @brief calculate pressure
loopsva 0:f97f410d4a21 338 //!
loopsva 0:f97f410d4a21 339 //! @return double barometric pressure millibar
loopsva 0:f97f410d4a21 340 //********************************************************
loopsva 0:f97f410d4a21 341
loopsva 0:f97f410d4a21 342 double ms5611::calcPressure() {
loopsva 0:f97f410d4a21 343 calcPT();
loopsva 0:f97f410d4a21 344 return(P);
loopsva 2:05804ed70748 345 }
loopsva 3:c2d1b0d432ad 346
loopsva 3:c2d1b0d432ad 347 //********************************************************
loopsva 3:c2d1b0d432ad 348 //! @brief get pressure, no calculation
loopsva 3:c2d1b0d432ad 349 //!
loopsva 3:c2d1b0d432ad 350 //! @return double barometric pressure millibar
loopsva 3:c2d1b0d432ad 351 //********************************************************
loopsva 3:c2d1b0d432ad 352
loopsva 3:c2d1b0d432ad 353 double ms5611::getPressure() {
loopsva 3:c2d1b0d432ad 354 calcPT();
loopsva 3:c2d1b0d432ad 355 return(P);
loopsva 3:c2d1b0d432ad 356 }
loopsva 3:c2d1b0d432ad 357
loopsva 3:c2d1b0d432ad 358 //********************************************************
loopsva 5:0d7b229474c6 359 //! @brief get altitude from known sea level barometer,
loopsva 5:0d7b229474c6 360 //! @ no pre-pressure calculation
loopsva 3:c2d1b0d432ad 361 //!
loopsva 3:c2d1b0d432ad 362 //! @enter float sea level barometer
loopsva 3:c2d1b0d432ad 363 //! @return float altitude in feet
loopsva 3:c2d1b0d432ad 364 //********************************************************
loopsva 3:c2d1b0d432ad 365
loopsva 3:c2d1b0d432ad 366 float ms5611::getAltitudeFT(float sea_pressure) {
loopsva 3:c2d1b0d432ad 367 A = (1 - (pow((P / (double)sea_pressure), 0.190284))) * 145366.45;
loopsva 3:c2d1b0d432ad 368 return((float)A);
loopsva 3:c2d1b0d432ad 369 }
loopsva 5:0d7b229474c6 370
loopsva 5:0d7b229474c6 371 //********************************************************
loopsva 5:0d7b229474c6 372 //! @brief get sea level pressure from known altitude(ft),
loopsva 5:0d7b229474c6 373 //! @ no pre-pressure calculation
loopsva 5:0d7b229474c6 374 //!
loopsva 5:0d7b229474c6 375 //! @enter float known altitude in feet
loopsva 5:0d7b229474c6 376 //! @return float seal level barometer in mb
loopsva 5:0d7b229474c6 377 //********************************************************
loopsva 5:0d7b229474c6 378
loopsva 5:0d7b229474c6 379 float ms5611::getSeaLevelBaroFT(float known_alt) {
loopsva 5:0d7b229474c6 380 S = pow(pow((P * INHG), 0.190284) + 0.00001313 * known_alt , 5.2553026) * MB;
loopsva 5:0d7b229474c6 381 return((float)S);
loopsva 5:0d7b229474c6 382 }
loopsva 5:0d7b229474c6 383
loopsva 5:0d7b229474c6 384 //********************************************************
loopsva 5:0d7b229474c6 385 //! @brief get sea level pressure from known altitude(m),
loopsva 5:0d7b229474c6 386 //! @ no pre-pressure calculation
loopsva 5:0d7b229474c6 387 //!
loopsva 5:0d7b229474c6 388 //! @enter float known altitude in meters
loopsva 5:0d7b229474c6 389 //! @return float seal level barometer in mb
loopsva 5:0d7b229474c6 390 //********************************************************
loopsva 5:0d7b229474c6 391
loopsva 5:0d7b229474c6 392 float ms5611::getSeaLevelBaroM(float known_alt) {
loopsva 5:0d7b229474c6 393 S = pow(pow((P * INHG), 0.190284) + 0.00001313 * known_alt * FTMETERS , 5.2553026) * MB;
loopsva 5:0d7b229474c6 394 return((float)S);
loopsva 5:0d7b229474c6 395 }
loopsva 12:e9a90b8c8688 396