Multi-Hackers / MPL3115A2

Class module for MPL3115A2 I2C Barometric Sensor

Dependents:   mDotEVBM2X MTDOT-EVBDemo-DRH MTDOT-BOX-EVB-Factory-Firmware-LIB-108 MTDOT-UDKDemo_Senet ... more

MPL3115A2.cpp@0:3f52908a334d, 2015-07-06 (annotated)

Committer:
falingtrea
Date:
Mon Jul 06 19:33:37 2015 +0000
Revision:
0:3f52908a334d
Child:
1:072fd24cc12b
Initial release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
falingtrea 0:3f52908a334d 1 /**
falingtrea 0:3f52908a334d 2 * @file MPL3115A2.cpp
falingtrea 0:3f52908a334d 3 * @brief Device driver - MPL3115A2 barometric pressure IC w/RTOS support
falingtrea 0:3f52908a334d 4 * @author Tim Barr
falingtrea 0:3f52908a334d 5 * @version 1.0
falingtrea 0:3f52908a334d 6 * @see http://cache.freescale.com/files/sensors/doc/data_sheet/MPL3115A2.pdf
falingtrea 0:3f52908a334d 7 *
falingtrea 0:3f52908a334d 8 * Copyright (c) 2015
falingtrea 0:3f52908a334d 9 *
falingtrea 0:3f52908a334d 10 * Licensed under the Apache License, Version 2.0 (the "License");
falingtrea 0:3f52908a334d 11 * you may not use this file except in compliance with the License.
falingtrea 0:3f52908a334d 12 * You may obtain a copy of the License at
falingtrea 0:3f52908a334d 13 *
falingtrea 0:3f52908a334d 14 * http://www.apache.org/licenses/LICENSE-2.0
falingtrea 0:3f52908a334d 15 *
falingtrea 0:3f52908a334d 16 * Unless required by applicable law or agreed to in writing, software
falingtrea 0:3f52908a334d 17 * distributed under the License is distributed on an "AS IS" BASIS,
falingtrea 0:3f52908a334d 18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
falingtrea 0:3f52908a334d 19 * See the License for the specific language governing permissions and
falingtrea 0:3f52908a334d 20 * limitations under the License.
falingtrea 0:3f52908a334d 21 */
falingtrea 0:3f52908a334d 22
falingtrea 0:3f52908a334d 23 #include "MPL3115A2.h"
falingtrea 0:3f52908a334d 24 #include "mbed_debug.h"
falingtrea 0:3f52908a334d 25 #include "rtos.h"
falingtrea 0:3f52908a334d 26
falingtrea 0:3f52908a334d 27 MPL3115A2::MPL3115A2( I2C &i2c, InterruptIn* int1, InterruptIn* int2)
falingtrea 0:3f52908a334d 28 {
falingtrea 0:3f52908a334d 29 _i2c = &i2c;
falingtrea 0:3f52908a334d 30 _int1 = int1;
falingtrea 0:3f52908a334d 31 _int2 = int2;
falingtrea 0:3f52908a334d 32
falingtrea 0:3f52908a334d 33 MPL3115A2::init();
falingtrea 0:3f52908a334d 34
falingtrea 0:3f52908a334d 35 return;
falingtrea 0:3f52908a334d 36 }
falingtrea 0:3f52908a334d 37
falingtrea 0:3f52908a334d 38 bool MPL3115A2::testWhoAmI(void)
falingtrea 0:3f52908a334d 39 {
falingtrea 0:3f52908a334d 40 char reg_val[1];
falingtrea 0:3f52908a334d 41
falingtrea 0:3f52908a334d 42 reg_val[0] = 0x00;
falingtrea 0:3f52908a334d 43 MPL3115A2::readRegister(WHO_AM_I,reg_val);
falingtrea 0:3f52908a334d 44
falingtrea 0:3f52908a334d 45 return (reg_val[0] == I_AM_MPL3115A2);
falingtrea 0:3f52908a334d 46
falingtrea 0:3f52908a334d 47 }
falingtrea 0:3f52908a334d 48
falingtrea 0:3f52908a334d 49 uint8_t MPL3115A2::init(void)
falingtrea 0:3f52908a334d 50 {
falingtrea 0:3f52908a334d 51 uint8_t result = 0;
falingtrea 0:3f52908a334d 52 uint8_t i = 0;
falingtrea 0:3f52908a334d 53 char reg_val[1];
falingtrea 0:3f52908a334d 54
falingtrea 0:3f52908a334d 55 _i2c->frequency(400000);
falingtrea 0:3f52908a334d 56
falingtrea 0:3f52908a334d 57 // Reset all registers to POR values
falingtrea 0:3f52908a334d 58 reg_val[0] = 0x04;
falingtrea 0:3f52908a334d 59 result = MPL3115A2::writeRegister(CTRL_REG1, reg_val);
falingtrea 0:3f52908a334d 60 if (result == 0){
falingtrea 0:3f52908a334d 61 do{
falingtrea 0:3f52908a334d 62 // wait for the reset bit to clear. readRegister may error out so we re-try 10 times
falingtrea 0:3f52908a334d 63 osDelay(200);
falingtrea 0:3f52908a334d 64 reg_val[0] = 0x40;
falingtrea 0:3f52908a334d 65 result = MPL3115A2::readRegister(CTRL_REG1,reg_val);
falingtrea 0:3f52908a334d 66 reg_val[0] = reg_val[0] & 0x04;
falingtrea 0:3f52908a334d 67 i++;
falingtrea 0:3f52908a334d 68 }while(((reg_val[0] != 0) || (result != 0)) && (i<=10));
falingtrea 0:3f52908a334d 69 }
falingtrea 0:3f52908a334d 70
falingtrea 0:3f52908a334d 71 if ((result == 0) && (MPL3115A2::testWhoAmI() == true)){
falingtrea 0:3f52908a334d 72
falingtrea 0:3f52908a334d 73 if ((_int1 == NULL) && (_int2 == NULL))
falingtrea 0:3f52908a334d 74 {
falingtrea 0:3f52908a334d 75 _polling_mode = true;
falingtrea 0:3f52908a334d 76 reg_val[0] = 0x07;
falingtrea 0:3f52908a334d 77 result |= MPL3115A2::writeRegister(PT_DATA_CFG,reg_val);
falingtrea 0:3f52908a334d 78 }
falingtrea 0:3f52908a334d 79 else _polling_mode = false;
falingtrea 0:3f52908a334d 80 }
falingtrea 0:3f52908a334d 81 else {
falingtrea 0:3f52908a334d 82 debug ("Device not supported by this library!\n\r");
falingtrea 0:3f52908a334d 83 result = 1;
falingtrea 0:3f52908a334d 84 }
falingtrea 0:3f52908a334d 85
falingtrea 0:3f52908a334d 86 if(result != 0)
falingtrea 0:3f52908a334d 87 {
falingtrea 0:3f52908a334d 88 debug("MPL3115A2:init failed\n\r");
falingtrea 0:3f52908a334d 89 }
falingtrea 0:3f52908a334d 90
falingtrea 0:3f52908a334d 91 return result;
falingtrea 0:3f52908a334d 92 }
falingtrea 0:3f52908a334d 93
falingtrea 0:3f52908a334d 94 uint8_t MPL3115A2::setParameters(OUTPUT_MODE out_mode, DATA_MODE data_mode, OVERSAMPLE_RATIO os_ratio,
falingtrea 0:3f52908a334d 95 ACQUISITION_TIMER measure_time)
falingtrea 0:3f52908a334d 96 {
falingtrea 0:3f52908a334d 97 uint8_t result = 0;
falingtrea 0:3f52908a334d 98 char datain[4];
falingtrea 0:3f52908a334d 99 char dataout[4];
falingtrea 0:3f52908a334d 100
falingtrea 0:3f52908a334d 101 result |= MPL3115A2::readRegister(SYSMOD, datain); // Make sure MPL3115A2 is in Stand-By mode
falingtrea 0:3f52908a334d 102 if ((datain[0] & 0x01) != 0 ){
falingtrea 0:3f52908a334d 103 debug ("MPL3115A2 not in STAND BY mode\n\f");
falingtrea 0:3f52908a334d 104 debug("MPL3115A2:setParameters failed\n\r");
falingtrea 0:3f52908a334d 105 result = 1;
falingtrea 0:3f52908a334d 106 return result;
falingtrea 0:3f52908a334d 107 }
falingtrea 0:3f52908a334d 108
falingtrea 0:3f52908a334d 109 result |= MPL3115A2::readRegister(CTRL_REG1, datain, 2);
falingtrea 0:3f52908a334d 110 dataout[0] = (datain[0] & 0x07) | os_ratio | out_mode | data_mode;
falingtrea 0:3f52908a334d 111 dataout[1] = (datain[1] & 0xF0) | measure_time;
falingtrea 0:3f52908a334d 112 result |= MPL3115A2::writeRegister(CTRL_REG1, dataout, 2);
falingtrea 0:3f52908a334d 113
falingtrea 0:3f52908a334d 114 if(result != 0)
falingtrea 0:3f52908a334d 115 {
falingtrea 0:3f52908a334d 116 debug("MPL3115A2:setParameters failed\n\r");
falingtrea 0:3f52908a334d 117 }
falingtrea 0:3f52908a334d 118
falingtrea 0:3f52908a334d 119 return result;
falingtrea 0:3f52908a334d 120 }
falingtrea 0:3f52908a334d 121
falingtrea 0:3f52908a334d 122 uint8_t MPL3115A2::enableFIFO(void)
falingtrea 0:3f52908a334d 123 {
falingtrea 0:3f52908a334d 124 uint8_t result = 0;
falingtrea 0:3f52908a334d 125 return result;
falingtrea 0:3f52908a334d 126 }
falingtrea 0:3f52908a334d 127
falingtrea 0:3f52908a334d 128 uint8_t MPL3115A2::activeMode(void)
falingtrea 0:3f52908a334d 129 {
falingtrea 0:3f52908a334d 130 uint8_t result = 0;
falingtrea 0:3f52908a334d 131 char datain[1];
falingtrea 0:3f52908a334d 132 char dataout[1];
falingtrea 0:3f52908a334d 133
falingtrea 0:3f52908a334d 134 result |= MPL3115A2::readRegister(CTRL_REG1, datain , 2);
falingtrea 0:3f52908a334d 135 dataout[0] = (datain[0] & 0xFE) | 0x01 ;
falingtrea 0:3f52908a334d 136 result |= MPL3115A2::writeRegister(CTRL_REG1, dataout); // Set to active mode
falingtrea 0:3f52908a334d 137
falingtrea 0:3f52908a334d 138 return result;
falingtrea 0:3f52908a334d 139 }
falingtrea 0:3f52908a334d 140 uint8_t MPL3115A2::standbyMode(void)
falingtrea 0:3f52908a334d 141 {
falingtrea 0:3f52908a334d 142 uint8_t result = 0;
falingtrea 0:3f52908a334d 143 char datain[1];
falingtrea 0:3f52908a334d 144 char dataout[1];
falingtrea 0:3f52908a334d 145
falingtrea 0:3f52908a334d 146 result |= MPL3115A2::readRegister(CTRL_REG1, datain);
falingtrea 0:3f52908a334d 147 dataout[0] = (datain[0] & 0xFE);
falingtrea 0:3f52908a334d 148 result |= MPL3115A2::writeRegister(CTRL_REG1, dataout); // Set to standby mode
falingtrea 0:3f52908a334d 149
falingtrea 0:3f52908a334d 150 return result;
falingtrea 0:3f52908a334d 151 }
falingtrea 0:3f52908a334d 152
falingtrea 0:3f52908a334d 153 uint8_t MPL3115A2::triggerOneShot(void)
falingtrea 0:3f52908a334d 154 {
falingtrea 0:3f52908a334d 155 uint8_t result = 0;
falingtrea 0:3f52908a334d 156 char datain[1];
falingtrea 0:3f52908a334d 157 char dataout[1];
falingtrea 0:3f52908a334d 158
falingtrea 0:3f52908a334d 159 result |= MPL3115A2::readRegister(CTRL_REG1, datain);
falingtrea 0:3f52908a334d 160 dataout[0] = ((datain[0] & 0xFD) | 0x02);
falingtrea 0:3f52908a334d 161 result |= MPL3115A2::writeRegister(CTRL_REG1, dataout); // Trigger a measurement
falingtrea 0:3f52908a334d 162
falingtrea 0:3f52908a334d 163 return result;
falingtrea 0:3f52908a334d 164 }
falingtrea 0:3f52908a334d 165
falingtrea 0:3f52908a334d 166 uint8_t MPL3115A2::setAltitudeCalib(int16_t alti_calib)
falingtrea 0:3f52908a334d 167 {
falingtrea 0:3f52908a334d 168 uint8_t result = 0;
falingtrea 0:3f52908a334d 169 char dataout[1];
falingtrea 0:3f52908a334d 170
falingtrea 0:3f52908a334d 171 dataout[0] = alti_calib ;
falingtrea 0:3f52908a334d 172 result |= MPL3115A2::writeRegister(CTRL_REG1, dataout); // set msb of calibration value
falingtrea 0:3f52908a334d 173
falingtrea 0:3f52908a334d 174 return result;
falingtrea 0:3f52908a334d 175 }
falingtrea 0:3f52908a334d 176
falingtrea 0:3f52908a334d 177 uint8_t MPL3115A2::clearMinMaxRegs(void)
falingtrea 0:3f52908a334d 178 {
falingtrea 0:3f52908a334d 179 uint8_t result = 0;
falingtrea 0:3f52908a334d 180 char datain[10];
falingtrea 0:3f52908a334d 181
falingtrea 0:3f52908a334d 182 memset(datain, 0, 10);
falingtrea 0:3f52908a334d 183 result = MPL3115A2::writeRegister(P_MIN_MSB, datain, 10);
falingtrea 0:3f52908a334d 184
falingtrea 0:3f52908a334d 185 return result;
falingtrea 0:3f52908a334d 186 }
falingtrea 0:3f52908a334d 187
falingtrea 0:3f52908a334d 188 uint8_t MPL3115A2::getStatus(void)
falingtrea 0:3f52908a334d 189 {
falingtrea 0:3f52908a334d 190 char datain[1];
falingtrea 0:3f52908a334d 191 uint8_t dataout;
falingtrea 0:3f52908a334d 192
falingtrea 0:3f52908a334d 193 MPL3115A2::readRegister(DR_STATUS, datain);
falingtrea 0:3f52908a334d 194 dataout = datain[0];
falingtrea 0:3f52908a334d 195
falingtrea 0:3f52908a334d 196 return dataout;
falingtrea 0:3f52908a334d 197 }
falingtrea 0:3f52908a334d 198
falingtrea 0:3f52908a334d 199 int32_t MPL3115A2::getBaroData(void)
falingtrea 0:3f52908a334d 200 {
falingtrea 0:3f52908a334d 201 if (_polling_mode)
falingtrea 0:3f52908a334d 202 {
falingtrea 0:3f52908a334d 203 char datain[3];
falingtrea 0:3f52908a334d 204 MPL3115A2::readRegister(OUT_P_MSB, datain, 3);
falingtrea 0:3f52908a334d 205 /* data is 20 bit signed/unsigned with 4 LSB = 0 Need to shift to 32 bits to preserve sign bit
falingtrea 0:3f52908a334d 206 * Altitude is 16 bit signed and pressure is 18 bit unsigned
falingtrea 0:3f52908a334d 207 */
falingtrea 0:3f52908a334d 208 _data._baro = ((datain[0] << 24) | (datain[1] << 16) | (datain[2]<<8));
falingtrea 0:3f52908a334d 209 }
falingtrea 0:3f52908a334d 210 return _data._baro;
falingtrea 0:3f52908a334d 211 }
falingtrea 0:3f52908a334d 212
falingtrea 0:3f52908a334d 213 int16_t MPL3115A2::getTempData(void)
falingtrea 0:3f52908a334d 214 {
falingtrea 0:3f52908a334d 215 if (_polling_mode)
falingtrea 0:3f52908a334d 216 {
falingtrea 0:3f52908a334d 217 char datain[2];
falingtrea 0:3f52908a334d 218 MPL3115A2::readRegister(OUT_T_MSB, datain, 2);
falingtrea 0:3f52908a334d 219 /* data is 12 bit signed with 4 LSB = 0 Need to shift first to 16 bits to preserve sign bit then
falingtrea 0:3f52908a334d 220 * divide by 16 to remove LSBs
falingtrea 0:3f52908a334d 221 */
falingtrea 0:3f52908a334d 222 _data._temp = ((datain[0] << 8) | datain[1]);
falingtrea 0:3f52908a334d 223 _data._temp /= 16;
falingtrea 0:3f52908a334d 224 }
falingtrea 0:3f52908a334d 225 return _data._temp;
falingtrea 0:3f52908a334d 226 }
falingtrea 0:3f52908a334d 227
falingtrea 0:3f52908a334d 228 int32_t MPL3115A2::getMinBaro(bool clear_data)
falingtrea 0:3f52908a334d 229 {
falingtrea 0:3f52908a334d 230 if (_polling_mode)
falingtrea 0:3f52908a334d 231 {
falingtrea 0:3f52908a334d 232 char datain[3];
falingtrea 0:3f52908a334d 233 MPL3115A2::readRegister(P_MIN_MSB, datain, 3);
falingtrea 0:3f52908a334d 234 /* data is 20 bit signed/unsigned with 4 LSB = 0 Need to shift to 32 bits to preserve sign bit
falingtrea 0:3f52908a334d 235 * Altitude is 16 bit signed and pressure is 18 bit unsigned
falingtrea 0:3f52908a334d 236 */
falingtrea 0:3f52908a334d 237 _data._minbaro = ((datain[0] << 24) | (datain[1] << 16) | (datain[2] << 8));
falingtrea 0:3f52908a334d 238
falingtrea 0:3f52908a334d 239 if (clear_data)
falingtrea 0:3f52908a334d 240 {
falingtrea 0:3f52908a334d 241 memset(datain, 0, 3);
falingtrea 0:3f52908a334d 242 MPL3115A2::writeRegister(P_MIN_MSB, datain, 3);
falingtrea 0:3f52908a334d 243 }
falingtrea 0:3f52908a334d 244 }
falingtrea 0:3f52908a334d 245
falingtrea 0:3f52908a334d 246 return _data._minbaro;
falingtrea 0:3f52908a334d 247 }
falingtrea 0:3f52908a334d 248
falingtrea 0:3f52908a334d 249 int32_t MPL3115A2::getMaxBaro(bool clear_data)
falingtrea 0:3f52908a334d 250 {
falingtrea 0:3f52908a334d 251 if (_polling_mode)
falingtrea 0:3f52908a334d 252 {
falingtrea 0:3f52908a334d 253 char datain[3];
falingtrea 0:3f52908a334d 254
falingtrea 0:3f52908a334d 255 MPL3115A2::readRegister(P_MAX_MSB, datain, 3);
falingtrea 0:3f52908a334d 256 /* data is 20 bit signed/unsigned with 4 LSB = 0 Need to shift to 32 bits to preserve sign bit
falingtrea 0:3f52908a334d 257 * Altitude is 16 bit signed and pressure is 18 bit unsigned
falingtrea 0:3f52908a334d 258 */
falingtrea 0:3f52908a334d 259 _data._maxbaro = ((datain[0] << 24) | (datain[1] << 16) | (datain[2] << 8));
falingtrea 0:3f52908a334d 260
falingtrea 0:3f52908a334d 261 if (clear_data)
falingtrea 0:3f52908a334d 262 {
falingtrea 0:3f52908a334d 263 memset(datain, 0, 3);
falingtrea 0:3f52908a334d 264 MPL3115A2::writeRegister(P_MAX_MSB, datain, 3);
falingtrea 0:3f52908a334d 265 }
falingtrea 0:3f52908a334d 266 }
falingtrea 0:3f52908a334d 267
falingtrea 0:3f52908a334d 268 return _data._maxbaro;
falingtrea 0:3f52908a334d 269 }
falingtrea 0:3f52908a334d 270
falingtrea 0:3f52908a334d 271 int16_t MPL3115A2::getMinTemp(bool clear_data)
falingtrea 0:3f52908a334d 272 {
falingtrea 0:3f52908a334d 273 if (_polling_mode)
falingtrea 0:3f52908a334d 274 {
falingtrea 0:3f52908a334d 275 char datain[2];
falingtrea 0:3f52908a334d 276 MPL3115A2::readRegister(T_MIN_MSB, datain, 2);
falingtrea 0:3f52908a334d 277 /* data is 12 bit signed with 4 LSB = 0 Need to shift first to 16 bits to preserve sign bit then
falingtrea 0:3f52908a334d 278 * divide by 16 to remove LSBs
falingtrea 0:3f52908a334d 279 */
falingtrea 0:3f52908a334d 280 _data._mintemp = ((datain[0] << 8) | datain[1] );
falingtrea 0:3f52908a334d 281 _data._mintemp /= 16;
falingtrea 0:3f52908a334d 282
falingtrea 0:3f52908a334d 283 if (clear_data)
falingtrea 0:3f52908a334d 284 {
falingtrea 0:3f52908a334d 285 memset(datain, 0, 2);
falingtrea 0:3f52908a334d 286 MPL3115A2::writeRegister(T_MIN_MSB, datain, 2);
falingtrea 0:3f52908a334d 287 }
falingtrea 0:3f52908a334d 288 }
falingtrea 0:3f52908a334d 289
falingtrea 0:3f52908a334d 290 return _data._mintemp;
falingtrea 0:3f52908a334d 291 }
falingtrea 0:3f52908a334d 292
falingtrea 0:3f52908a334d 293 int16_t MPL3115A2::getMaxTemp(bool clear_data)
falingtrea 0:3f52908a334d 294 {
falingtrea 0:3f52908a334d 295 if (_polling_mode)
falingtrea 0:3f52908a334d 296 {
falingtrea 0:3f52908a334d 297 char datain[2];
falingtrea 0:3f52908a334d 298 MPL3115A2::readRegister(T_MIN_MSB, datain, 2);
falingtrea 0:3f52908a334d 299 /* data is 12 bit signed with 4 LSB = 0 Need to shift first to 16 bits to preserve sign bit then
falingtrea 0:3f52908a334d 300 * divide by 16 to remove LSBs
falingtrea 0:3f52908a334d 301 */
falingtrea 0:3f52908a334d 302 _data._maxtemp = ((datain[0] << 8) | datain[1] );
falingtrea 0:3f52908a334d 303 _data._maxtemp /= 16;
falingtrea 0:3f52908a334d 304
falingtrea 0:3f52908a334d 305 if (clear_data)
falingtrea 0:3f52908a334d 306 {
falingtrea 0:3f52908a334d 307 memset(datain, 0, 2);
falingtrea 0:3f52908a334d 308 MPL3115A2::writeRegister(T_MAX_MSB, datain, 2);
falingtrea 0:3f52908a334d 309 }
falingtrea 0:3f52908a334d 310 }
falingtrea 0:3f52908a334d 311
falingtrea 0:3f52908a334d 312 return _data._maxtemp;
falingtrea 0:3f52908a334d 313 }
falingtrea 0:3f52908a334d 314
falingtrea 0:3f52908a334d 315 MPL3115A2_DATA MPL3115A2::getAllData(bool clear_data)
falingtrea 0:3f52908a334d 316 {
falingtrea 0:3f52908a334d 317
falingtrea 0:3f52908a334d 318 if (_polling_mode)
falingtrea 0:3f52908a334d 319 {
falingtrea 0:3f52908a334d 320 char datain[10];
falingtrea 0:3f52908a334d 321 MPL3115A2::readRegister(OUT_P_MSB, datain, 5);
falingtrea 0:3f52908a334d 322 /* data is 20 bit signed/unsigned with 4 LSB = 0 Need to shift to 32 bits to preserve sign bit
falingtrea 0:3f52908a334d 323 * Altitude is 16 bit signed and pressure is 18 bit unsigned
falingtrea 0:3f52908a334d 324 */
falingtrea 0:3f52908a334d 325 _data._baro = ((datain[0] << 24) | (datain[1] << 16) | (datain[2]<<8));
falingtrea 0:3f52908a334d 326
falingtrea 0:3f52908a334d 327 /* data is 12 bit signed with 4 LSB = 0 Need to shift first to 16 bits to preserve sign bit then
falingtrea 0:3f52908a334d 328 * divide by 16 to remove LSBs
falingtrea 0:3f52908a334d 329 */
falingtrea 0:3f52908a334d 330 _data._temp = ((datain[3] << 8) | datain[4]);
falingtrea 0:3f52908a334d 331 _data._temp /= 16;
falingtrea 0:3f52908a334d 332
falingtrea 0:3f52908a334d 333 MPL3115A2::readRegister(P_MIN_MSB, datain, 10);
falingtrea 0:3f52908a334d 334 /* data is 20 bit signed/unsigned with 4 LSB = 0 Need to shift to 32 bits to preserve sign bit
falingtrea 0:3f52908a334d 335 * Altitude is 16 bit signed and pressure is 18 bit unsigned
falingtrea 0:3f52908a334d 336 * temperature data is 12 bit signed with 4 LSB = 0 Need to shift first to 16 bits to preserve sign bit then
falingtrea 0:3f52908a334d 337 * divide by 16 to remove LSBs
falingtrea 0:3f52908a334d 338 */
falingtrea 0:3f52908a334d 339 _data._minbaro = ((datain[0] << 24) | (datain[1] << 16) | (datain[2] << 8));
falingtrea 0:3f52908a334d 340 _data._mintemp = ((datain[3] << 8) | datain[4] );
falingtrea 0:3f52908a334d 341 _data._mintemp /= 16;
falingtrea 0:3f52908a334d 342 _data._maxbaro = ((datain[5] << 24) | (datain[6] << 16) | (datain[7] << 8));
falingtrea 0:3f52908a334d 343 _data._maxtemp = ((datain[8] << 8) | datain[9] );
falingtrea 0:3f52908a334d 344 _data._maxtemp /= 16;
falingtrea 0:3f52908a334d 345
falingtrea 0:3f52908a334d 346 if (clear_data)
falingtrea 0:3f52908a334d 347 {
falingtrea 0:3f52908a334d 348 MPL3115A2::clearMinMaxRegs();
falingtrea 0:3f52908a334d 349 }
falingtrea 0:3f52908a334d 350 }
falingtrea 0:3f52908a334d 351
falingtrea 0:3f52908a334d 352 return _data;
falingtrea 0:3f52908a334d 353 }
falingtrea 0:3f52908a334d 354
falingtrea 0:3f52908a334d 355 uint8_t MPL3115A2::writeRegister(uint8_t reg, char* data, uint8_t count)
falingtrea 0:3f52908a334d 356 {
falingtrea 0:3f52908a334d 357 char buf[11];
falingtrea 0:3f52908a334d 358 uint8_t result = 0;
falingtrea 0:3f52908a334d 359
falingtrea 0:3f52908a334d 360 buf[0] = reg;
falingtrea 0:3f52908a334d 361 memcpy(buf+1,data,count);
falingtrea 0:3f52908a334d 362
falingtrea 0:3f52908a334d 363 // __disable_irq(); // Tickers and other timebase events can jack up the I2C bus for some devices
falingtrea 0:3f52908a334d 364 result |= _i2c->write(_i2c_addr, buf, (count + 1));
falingtrea 0:3f52908a334d 365 // __enable_irq(); // Just need to block during the transaction
falingtrea 0:3f52908a334d 366
falingtrea 0:3f52908a334d 367 if(result != 0)
falingtrea 0:3f52908a334d 368 {
falingtrea 0:3f52908a334d 369 debug("MPL3115A2:writeRegister failed\n\r");
falingtrea 0:3f52908a334d 370 }
falingtrea 0:3f52908a334d 371
falingtrea 0:3f52908a334d 372 return result;
falingtrea 0:3f52908a334d 373 }
falingtrea 0:3f52908a334d 374
falingtrea 0:3f52908a334d 375 uint8_t MPL3115A2::readRegister(uint8_t reg, char* data, uint8_t count)
falingtrea 0:3f52908a334d 376 {
falingtrea 0:3f52908a334d 377 uint8_t result = 0;
falingtrea 0:3f52908a334d 378 char reg_out[1];
falingtrea 0:3f52908a334d 379
falingtrea 0:3f52908a334d 380 reg_out[0] = reg;
falingtrea 0:3f52908a334d 381 // __disable_irq(); // Tickers and other timebase events can jack up the I2C bus for some devices
falingtrea 0:3f52908a334d 382 result |= _i2c->write(_i2c_addr,reg_out,1,true);
falingtrea 0:3f52908a334d 383 // __enable_irq(); // Just need to block during the transaction
falingtrea 0:3f52908a334d 384
falingtrea 0:3f52908a334d 385 if(result != 0)
falingtrea 0:3f52908a334d 386 {
falingtrea 0:3f52908a334d 387 debug("MPL3115A2::readRegister failed write\n\r");
falingtrea 0:3f52908a334d 388 return result;
falingtrea 0:3f52908a334d 389 }
falingtrea 0:3f52908a334d 390
falingtrea 0:3f52908a334d 391 // __disable_irq(); // Tickers and other timebase events can jack up the I2C bus for some devices
falingtrea 0:3f52908a334d 392 result |= _i2c->read(_i2c_addr,data,count,false);
falingtrea 0:3f52908a334d 393 // __enable_irq(); // Just need to block during the transaction
falingtrea 0:3f52908a334d 394
falingtrea 0:3f52908a334d 395 if(result != 0)
falingtrea 0:3f52908a334d 396 {
falingtrea 0:3f52908a334d 397 debug("MPL3115A2::readRegister failed read\n\r");
falingtrea 0:3f52908a334d 398 }
falingtrea 0:3f52908a334d 399
falingtrea 0:3f52908a334d 400 return result;
falingtrea 0:3f52908a334d 401 }
falingtrea 0:3f52908a334d 402
falingtrea 0:3f52908a334d 403