Arturo Gasca / MAX30100_

m

Fork of MAX30100 by Eduardo Avelar

MAX30100.cpp@0:010b908e2187, 2016-11-25 (annotated)

Committer:
AVELARDEV
Date:
Fri Nov 25 00:52:54 2016 +0000
Revision:
0:010b908e2187
Child:
1:e3b9aff8f221
max30100 example

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AVELARDEV 0:010b908e2187 1 /*
AVELARDEV 0:010b908e2187 2 Arduino-MAX30100 oximetry / heart rate integrated sensor library
AVELARDEV 0:010b908e2187 3 Copyright (C) 2016 OXullo Intersecans <x@brainrapers.org>
AVELARDEV 0:010b908e2187 4 This program is free software: you can redistribute it and/or modify
AVELARDEV 0:010b908e2187 5 it under the terms of the GNU General Public License as published by
AVELARDEV 0:010b908e2187 6 the Free Software Foundation, either version 3 of the License, or
AVELARDEV 0:010b908e2187 7 (at your option) any later version.
AVELARDEV 0:010b908e2187 8 This program is distributed in the hope that it will be useful,
AVELARDEV 0:010b908e2187 9 but WITHOUT ANY WARRANTY; without even the implied warranty of
AVELARDEV 0:010b908e2187 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
AVELARDEV 0:010b908e2187 11 GNU General Public License for more details.
AVELARDEV 0:010b908e2187 12 You should have received a copy of the GNU General Public License
AVELARDEV 0:010b908e2187 13 along with this program. If not, see <http://www.gnu.org/licenses/>.
AVELARDEV 0:010b908e2187 14 */
AVELARDEV 0:010b908e2187 15
AVELARDEV 0:010b908e2187 16 #include "MAX30100.h"
AVELARDEV 0:010b908e2187 17
AVELARDEV 0:010b908e2187 18 I2C Wire(I2C_SDA , I2C_SCL );
AVELARDEV 0:010b908e2187 19
AVELARDEV 0:010b908e2187 20 MAX30100::MAX30100()
AVELARDEV 0:010b908e2187 21 {
AVELARDEV 0:010b908e2187 22
AVELARDEV 0:010b908e2187 23 }
AVELARDEV 0:010b908e2187 24
AVELARDEV 0:010b908e2187 25 bool MAX30100::begin()
AVELARDEV 0:010b908e2187 26 {
AVELARDEV 0:010b908e2187 27 // Wire.begin();
AVELARDEV 0:010b908e2187 28 // Wire.setClock(I2C_BUS_SPEED);
AVELARDEV 0:010b908e2187 29
AVELARDEV 0:010b908e2187 30 Wire.frequency(I2C_BUS_SPEED);
AVELARDEV 0:010b908e2187 31
AVELARDEV 0:010b908e2187 32 if(!setMode(DEFAULT_MODE))
AVELARDEV 0:010b908e2187 33 return false;
AVELARDEV 0:010b908e2187 34 if(!setLedsPulseWidth(DEFAULT_PULSE_WIDTH))
AVELARDEV 0:010b908e2187 35 return false;
AVELARDEV 0:010b908e2187 36 if(!setSamplingRate(DEFAULT_SAMPLING_RATE))
AVELARDEV 0:010b908e2187 37 return false;
AVELARDEV 0:010b908e2187 38 if(!setLedsCurrent(DEFAULT_IR_LED_CURRENT, DEFAULT_RED_LED_CURRENT))
AVELARDEV 0:010b908e2187 39 return false;
AVELARDEV 0:010b908e2187 40 if(!setHighresModeEnabled(true))
AVELARDEV 0:010b908e2187 41 return false;
AVELARDEV 0:010b908e2187 42
AVELARDEV 0:010b908e2187 43 return true;
AVELARDEV 0:010b908e2187 44 }
AVELARDEV 0:010b908e2187 45
AVELARDEV 0:010b908e2187 46 bool MAX30100::setMode(Mode mode)
AVELARDEV 0:010b908e2187 47 {
AVELARDEV 0:010b908e2187 48 if(!writeRegister(MAX30100_REG_MODE_CONFIGURATION, mode))
AVELARDEV 0:010b908e2187 49 return false;
AVELARDEV 0:010b908e2187 50 else
AVELARDEV 0:010b908e2187 51 return true;
AVELARDEV 0:010b908e2187 52 }
AVELARDEV 0:010b908e2187 53
AVELARDEV 0:010b908e2187 54 bool MAX30100::setLedsPulseWidth(LEDPulseWidth ledPulseWidth)
AVELARDEV 0:010b908e2187 55 {
AVELARDEV 0:010b908e2187 56 uint8_t previous;
AVELARDEV 0:010b908e2187 57 if(readRegister(MAX30100_REG_SPO2_CONFIGURATION, &previous))
AVELARDEV 0:010b908e2187 58 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, (previous & 0xfc) | ledPulseWidth))
AVELARDEV 0:010b908e2187 59 return false;
AVELARDEV 0:010b908e2187 60 else
AVELARDEV 0:010b908e2187 61 return true;
AVELARDEV 0:010b908e2187 62 else
AVELARDEV 0:010b908e2187 63 return false;
AVELARDEV 0:010b908e2187 64 }
AVELARDEV 0:010b908e2187 65
AVELARDEV 0:010b908e2187 66 bool MAX30100::setSamplingRate(SamplingRate samplingRate)
AVELARDEV 0:010b908e2187 67 {
AVELARDEV 0:010b908e2187 68 uint8_t previous;
AVELARDEV 0:010b908e2187 69 if(readRegister(MAX30100_REG_SPO2_CONFIGURATION, &previous))
AVELARDEV 0:010b908e2187 70 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, (previous & 0xe3) | (samplingRate << 2)))
AVELARDEV 0:010b908e2187 71 return false;
AVELARDEV 0:010b908e2187 72 else
AVELARDEV 0:010b908e2187 73 return true;
AVELARDEV 0:010b908e2187 74 else
AVELARDEV 0:010b908e2187 75 return false;
AVELARDEV 0:010b908e2187 76 }
AVELARDEV 0:010b908e2187 77
AVELARDEV 0:010b908e2187 78 bool MAX30100::setLedsCurrent(LEDCurrent irLedCurrent, LEDCurrent redLedCurrent)
AVELARDEV 0:010b908e2187 79 {
AVELARDEV 0:010b908e2187 80 if(!writeRegister(MAX30100_REG_LED_CONFIGURATION, redLedCurrent << 4 | irLedCurrent))
AVELARDEV 0:010b908e2187 81 return false;
AVELARDEV 0:010b908e2187 82 else
AVELARDEV 0:010b908e2187 83 return true;
AVELARDEV 0:010b908e2187 84 }
AVELARDEV 0:010b908e2187 85
AVELARDEV 0:010b908e2187 86 bool MAX30100::setHighresModeEnabled(bool enabled)
AVELARDEV 0:010b908e2187 87 {
AVELARDEV 0:010b908e2187 88 uint8_t previous;
AVELARDEV 0:010b908e2187 89 if(readRegister(MAX30100_REG_SPO2_CONFIGURATION, &previous))
AVELARDEV 0:010b908e2187 90 if (enabled) {
AVELARDEV 0:010b908e2187 91 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, previous | MAX30100_SPC_SPO2_HI_RES_EN))
AVELARDEV 0:010b908e2187 92 return false;
AVELARDEV 0:010b908e2187 93 else
AVELARDEV 0:010b908e2187 94 return true;
AVELARDEV 0:010b908e2187 95 } else {
AVELARDEV 0:010b908e2187 96 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, previous & ~MAX30100_SPC_SPO2_HI_RES_EN))
AVELARDEV 0:010b908e2187 97 return false;
AVELARDEV 0:010b908e2187 98 else
AVELARDEV 0:010b908e2187 99 return true;
AVELARDEV 0:010b908e2187 100 }
AVELARDEV 0:010b908e2187 101 else
AVELARDEV 0:010b908e2187 102 return false;
AVELARDEV 0:010b908e2187 103 }
AVELARDEV 0:010b908e2187 104
AVELARDEV 0:010b908e2187 105
AVELARDEV 0:010b908e2187 106 bool MAX30100::update()
AVELARDEV 0:010b908e2187 107 {
AVELARDEV 0:010b908e2187 108 if(!readFifoData())
AVELARDEV 0:010b908e2187 109 return false;
AVELARDEV 0:010b908e2187 110 else
AVELARDEV 0:010b908e2187 111 return true;
AVELARDEV 0:010b908e2187 112 }
AVELARDEV 0:010b908e2187 113
AVELARDEV 0:010b908e2187 114
AVELARDEV 0:010b908e2187 115 /*
AVELARDEV 0:010b908e2187 116 uint8_t MAX30100::readRegister(uint8_t address)
AVELARDEV 0:010b908e2187 117 {
AVELARDEV 0:010b908e2187 118 Wire.beginTransmission(MAX30100_I2C_ADDRESS);
AVELARDEV 0:010b908e2187 119 Wire.write(address);
AVELARDEV 0:010b908e2187 120 Wire.endTransmission(false);
AVELARDEV 0:010b908e2187 121 Wire.requestFrom(MAX30100_I2C_ADDRESS, 1);
AVELARDEV 0:010b908e2187 122
AVELARDEV 0:010b908e2187 123 return Wire.read();
AVELARDEV 0:010b908e2187 124 }
AVELARDEV 0:010b908e2187 125 */
AVELARDEV 0:010b908e2187 126
AVELARDEV 0:010b908e2187 127 bool MAX30100::readRegister(uint8_t uch_addr, uint8_t *puch_data)
AVELARDEV 0:010b908e2187 128 /**
AVELARDEV 0:010b908e2187 129 * \brief Read a MAX30102 register
AVELARDEV 0:010b908e2187 130 * \par Details
AVELARDEV 0:010b908e2187 131 * This function reads a MAX30102 register
AVELARDEV 0:010b908e2187 132 *
AVELARDEV 0:010b908e2187 133 * \param[in] uch_addr - register address
AVELARDEV 0:010b908e2187 134 * \param[out] puch_data - pointer that stores the register data
AVELARDEV 0:010b908e2187 135 *
AVELARDEV 0:010b908e2187 136 * \retval true on success
AVELARDEV 0:010b908e2187 137 */
AVELARDEV 0:010b908e2187 138 {
AVELARDEV 0:010b908e2187 139 char ch_i2c_data;
AVELARDEV 0:010b908e2187 140 ch_i2c_data=uch_addr;
AVELARDEV 0:010b908e2187 141 if(Wire.write(I2C_WRITE_ADDR, &ch_i2c_data, 1, true)!=0)
AVELARDEV 0:010b908e2187 142 return false;
AVELARDEV 0:010b908e2187 143 if(Wire.read(I2C_READ_ADDR, &ch_i2c_data, 1, false)==0)
AVELARDEV 0:010b908e2187 144 {
AVELARDEV 0:010b908e2187 145 *puch_data=(uint8_t) ch_i2c_data;
AVELARDEV 0:010b908e2187 146 return true;
AVELARDEV 0:010b908e2187 147 }
AVELARDEV 0:010b908e2187 148 else
AVELARDEV 0:010b908e2187 149 return false;
AVELARDEV 0:010b908e2187 150 }
AVELARDEV 0:010b908e2187 151
AVELARDEV 0:010b908e2187 152 /*
AVELARDEV 0:010b908e2187 153 void MAX30100::writeRegister(uint8_t address, uint8_t data)
AVELARDEV 0:010b908e2187 154 {
AVELARDEV 0:010b908e2187 155 Wire.beginTransmission(MAX30100_I2C_ADDRESS);
AVELARDEV 0:010b908e2187 156 Wire.write(address);
AVELARDEV 0:010b908e2187 157 Wire.write(data);
AVELARDEV 0:010b908e2187 158 Wire.endTransmission();
AVELARDEV 0:010b908e2187 159 }
AVELARDEV 0:010b908e2187 160 */
AVELARDEV 0:010b908e2187 161
AVELARDEV 0:010b908e2187 162 bool MAX30100::writeRegister(uint8_t uch_addr, uint8_t uch_data)
AVELARDEV 0:010b908e2187 163 /**
AVELARDEV 0:010b908e2187 164 * \brief Write a value to a MAX30102 register
AVELARDEV 0:010b908e2187 165 * \par Details
AVELARDEV 0:010b908e2187 166 * This function writes a value to a MAX30102 register
AVELARDEV 0:010b908e2187 167 *
AVELARDEV 0:010b908e2187 168 * \param[in] uch_addr - register address
AVELARDEV 0:010b908e2187 169 * \param[in] uch_data - register data
AVELARDEV 0:010b908e2187 170 *
AVELARDEV 0:010b908e2187 171 * \retval true on success
AVELARDEV 0:010b908e2187 172 */
AVELARDEV 0:010b908e2187 173 {
AVELARDEV 0:010b908e2187 174 char ach_i2c_data[2];
AVELARDEV 0:010b908e2187 175 ach_i2c_data[0]=uch_addr;
AVELARDEV 0:010b908e2187 176 ach_i2c_data[1]=uch_data;
AVELARDEV 0:010b908e2187 177
AVELARDEV 0:010b908e2187 178 if(Wire.write(I2C_WRITE_ADDR, ach_i2c_data, 2, false)==0)
AVELARDEV 0:010b908e2187 179 return true;
AVELARDEV 0:010b908e2187 180 else
AVELARDEV 0:010b908e2187 181 return false;
AVELARDEV 0:010b908e2187 182 }
AVELARDEV 0:010b908e2187 183
AVELARDEV 0:010b908e2187 184 bool MAX30100::readFifoData()
AVELARDEV 0:010b908e2187 185 {
AVELARDEV 0:010b908e2187 186 char ach_i2c_data[4];
AVELARDEV 0:010b908e2187 187
AVELARDEV 0:010b908e2187 188 ach_i2c_data[0]=MAX30100_REG_FIFO_DATA;
AVELARDEV 0:010b908e2187 189 if(Wire.write(I2C_WRITE_ADDR, ach_i2c_data, 1, true)!=0)
AVELARDEV 0:010b908e2187 190 return false;
AVELARDEV 0:010b908e2187 191 if(Wire.read(I2C_READ_ADDR, ach_i2c_data, 4, false)!=0)
AVELARDEV 0:010b908e2187 192 return false;
AVELARDEV 0:010b908e2187 193
AVELARDEV 0:010b908e2187 194 // Warning: the values are always left-aligned
AVELARDEV 0:010b908e2187 195 rawIRValue = (ach_i2c_data[0] << 8) | ach_i2c_data[1];
AVELARDEV 0:010b908e2187 196 rawRedValue = (ach_i2c_data[2] << 8) | ach_i2c_data[3];
AVELARDEV 0:010b908e2187 197
AVELARDEV 0:010b908e2187 198 return true;
AVELARDEV 0:010b908e2187 199 }