Rostislav Krylov / MAX30100

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MAX30100.cpp@1:a9cc51956082, 2021-11-03 (annotated)

Committer:
condato_mbed
Date:
Wed Nov 03 15:59:01 2021 +0000
Revision:
1:a9cc51956082
Parent:
0:010b908e2187 
HAND

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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
condato_mbed 1:a9cc51956082 18 extern I2C i2c;
condato_mbed 1:a9cc51956082 19 //I2C Wire(P3_4 , P3_5 );
AVELARDEV 0:010b908e2187 20
AVELARDEV 0:010b908e2187 21 MAX30100::MAX30100()
AVELARDEV 0:010b908e2187 22 {
AVELARDEV 0:010b908e2187 23
AVELARDEV 0:010b908e2187 24 }
AVELARDEV 0:010b908e2187 25
AVELARDEV 0:010b908e2187 26 bool MAX30100::begin()
AVELARDEV 0:010b908e2187 27 {
AVELARDEV 0:010b908e2187 28 // Wire.begin();
AVELARDEV 0:010b908e2187 29 // Wire.setClock(I2C_BUS_SPEED);
AVELARDEV 0:010b908e2187 30
condato_mbed 1:a9cc51956082 31 //Wire.frequency(I2C_BUS_SPEED);
AVELARDEV 0:010b908e2187 32
AVELARDEV 0:010b908e2187 33 if(!setMode(DEFAULT_MODE))
AVELARDEV 0:010b908e2187 34 return false;
AVELARDEV 0:010b908e2187 35 if(!setLedsPulseWidth(DEFAULT_PULSE_WIDTH))
AVELARDEV 0:010b908e2187 36 return false;
AVELARDEV 0:010b908e2187 37 if(!setSamplingRate(DEFAULT_SAMPLING_RATE))
AVELARDEV 0:010b908e2187 38 return false;
AVELARDEV 0:010b908e2187 39 if(!setLedsCurrent(DEFAULT_IR_LED_CURRENT, DEFAULT_RED_LED_CURRENT))
AVELARDEV 0:010b908e2187 40 return false;
AVELARDEV 0:010b908e2187 41 if(!setHighresModeEnabled(true))
AVELARDEV 0:010b908e2187 42 return false;
AVELARDEV 0:010b908e2187 43
AVELARDEV 0:010b908e2187 44 return true;
AVELARDEV 0:010b908e2187 45 }
AVELARDEV 0:010b908e2187 46
AVELARDEV 0:010b908e2187 47 bool MAX30100::setMode(Mode mode)
AVELARDEV 0:010b908e2187 48 {
AVELARDEV 0:010b908e2187 49 if(!writeRegister(MAX30100_REG_MODE_CONFIGURATION, mode))
AVELARDEV 0:010b908e2187 50 return false;
AVELARDEV 0:010b908e2187 51 else
AVELARDEV 0:010b908e2187 52 return true;
AVELARDEV 0:010b908e2187 53 }
AVELARDEV 0:010b908e2187 54
AVELARDEV 0:010b908e2187 55 bool MAX30100::setLedsPulseWidth(LEDPulseWidth ledPulseWidth)
AVELARDEV 0:010b908e2187 56 {
AVELARDEV 0:010b908e2187 57 uint8_t previous;
AVELARDEV 0:010b908e2187 58 if(readRegister(MAX30100_REG_SPO2_CONFIGURATION, &previous))
AVELARDEV 0:010b908e2187 59 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, (previous & 0xfc) | ledPulseWidth))
AVELARDEV 0:010b908e2187 60 return false;
AVELARDEV 0:010b908e2187 61 else
AVELARDEV 0:010b908e2187 62 return true;
AVELARDEV 0:010b908e2187 63 else
AVELARDEV 0:010b908e2187 64 return false;
AVELARDEV 0:010b908e2187 65 }
AVELARDEV 0:010b908e2187 66
AVELARDEV 0:010b908e2187 67 bool MAX30100::setSamplingRate(SamplingRate samplingRate)
AVELARDEV 0:010b908e2187 68 {
AVELARDEV 0:010b908e2187 69 uint8_t previous;
AVELARDEV 0:010b908e2187 70 if(readRegister(MAX30100_REG_SPO2_CONFIGURATION, &previous))
AVELARDEV 0:010b908e2187 71 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, (previous & 0xe3) | (samplingRate << 2)))
AVELARDEV 0:010b908e2187 72 return false;
AVELARDEV 0:010b908e2187 73 else
AVELARDEV 0:010b908e2187 74 return true;
AVELARDEV 0:010b908e2187 75 else
AVELARDEV 0:010b908e2187 76 return false;
AVELARDEV 0:010b908e2187 77 }
AVELARDEV 0:010b908e2187 78
AVELARDEV 0:010b908e2187 79 bool MAX30100::setLedsCurrent(LEDCurrent irLedCurrent, LEDCurrent redLedCurrent)
AVELARDEV 0:010b908e2187 80 {
AVELARDEV 0:010b908e2187 81 if(!writeRegister(MAX30100_REG_LED_CONFIGURATION, redLedCurrent << 4 | irLedCurrent))
AVELARDEV 0:010b908e2187 82 return false;
AVELARDEV 0:010b908e2187 83 else
AVELARDEV 0:010b908e2187 84 return true;
AVELARDEV 0:010b908e2187 85 }
AVELARDEV 0:010b908e2187 86
AVELARDEV 0:010b908e2187 87 bool MAX30100::setHighresModeEnabled(bool enabled)
AVELARDEV 0:010b908e2187 88 {
AVELARDEV 0:010b908e2187 89 uint8_t previous;
AVELARDEV 0:010b908e2187 90 if(readRegister(MAX30100_REG_SPO2_CONFIGURATION, &previous))
AVELARDEV 0:010b908e2187 91 if (enabled) {
AVELARDEV 0:010b908e2187 92 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, previous | MAX30100_SPC_SPO2_HI_RES_EN))
AVELARDEV 0:010b908e2187 93 return false;
AVELARDEV 0:010b908e2187 94 else
AVELARDEV 0:010b908e2187 95 return true;
AVELARDEV 0:010b908e2187 96 } else {
AVELARDEV 0:010b908e2187 97 if(!writeRegister(MAX30100_REG_SPO2_CONFIGURATION, previous & ~MAX30100_SPC_SPO2_HI_RES_EN))
AVELARDEV 0:010b908e2187 98 return false;
AVELARDEV 0:010b908e2187 99 else
AVELARDEV 0:010b908e2187 100 return true;
AVELARDEV 0:010b908e2187 101 }
AVELARDEV 0:010b908e2187 102 else
AVELARDEV 0:010b908e2187 103 return false;
AVELARDEV 0:010b908e2187 104 }
AVELARDEV 0:010b908e2187 105
AVELARDEV 0:010b908e2187 106
AVELARDEV 0:010b908e2187 107 bool MAX30100::update()
AVELARDEV 0:010b908e2187 108 {
AVELARDEV 0:010b908e2187 109 if(!readFifoData())
AVELARDEV 0:010b908e2187 110 return false;
AVELARDEV 0:010b908e2187 111 else
AVELARDEV 0:010b908e2187 112 return true;
AVELARDEV 0:010b908e2187 113 }
AVELARDEV 0:010b908e2187 114
AVELARDEV 0:010b908e2187 115
AVELARDEV 0:010b908e2187 116 /*
AVELARDEV 0:010b908e2187 117 uint8_t MAX30100::readRegister(uint8_t address)
AVELARDEV 0:010b908e2187 118 {
AVELARDEV 0:010b908e2187 119 Wire.beginTransmission(MAX30100_I2C_ADDRESS);
AVELARDEV 0:010b908e2187 120 Wire.write(address);
AVELARDEV 0:010b908e2187 121 Wire.endTransmission(false);
AVELARDEV 0:010b908e2187 122 Wire.requestFrom(MAX30100_I2C_ADDRESS, 1);
AVELARDEV 0:010b908e2187 123
AVELARDEV 0:010b908e2187 124 return Wire.read();
AVELARDEV 0:010b908e2187 125 }
AVELARDEV 0:010b908e2187 126 */
AVELARDEV 0:010b908e2187 127
AVELARDEV 0:010b908e2187 128 bool MAX30100::readRegister(uint8_t uch_addr, uint8_t *puch_data)
AVELARDEV 0:010b908e2187 129 /**
AVELARDEV 0:010b908e2187 130 * \brief Read a MAX30102 register
AVELARDEV 0:010b908e2187 131 * \par Details
AVELARDEV 0:010b908e2187 132 * This function reads a MAX30102 register
AVELARDEV 0:010b908e2187 133 *
AVELARDEV 0:010b908e2187 134 * \param[in] uch_addr - register address
AVELARDEV 0:010b908e2187 135 * \param[out] puch_data - pointer that stores the register data
AVELARDEV 0:010b908e2187 136 *
AVELARDEV 0:010b908e2187 137 * \retval true on success
AVELARDEV 0:010b908e2187 138 */
AVELARDEV 0:010b908e2187 139 {
AVELARDEV 0:010b908e2187 140 char ch_i2c_data;
AVELARDEV 0:010b908e2187 141 ch_i2c_data=uch_addr;
condato_mbed 1:a9cc51956082 142 if(i2c.write(I2C_WRITE_ADDR, &ch_i2c_data, 1, true)!=0)
AVELARDEV 0:010b908e2187 143 return false;
condato_mbed 1:a9cc51956082 144 if(i2c.read(I2C_READ_ADDR, &ch_i2c_data, 1, false)==0)
AVELARDEV 0:010b908e2187 145 {
AVELARDEV 0:010b908e2187 146 *puch_data=(uint8_t) ch_i2c_data;
AVELARDEV 0:010b908e2187 147 return true;
AVELARDEV 0:010b908e2187 148 }
AVELARDEV 0:010b908e2187 149 else
AVELARDEV 0:010b908e2187 150 return false;
AVELARDEV 0:010b908e2187 151 }
AVELARDEV 0:010b908e2187 152
AVELARDEV 0:010b908e2187 153 /*
AVELARDEV 0:010b908e2187 154 void MAX30100::writeRegister(uint8_t address, uint8_t data)
AVELARDEV 0:010b908e2187 155 {
AVELARDEV 0:010b908e2187 156 Wire.beginTransmission(MAX30100_I2C_ADDRESS);
AVELARDEV 0:010b908e2187 157 Wire.write(address);
AVELARDEV 0:010b908e2187 158 Wire.write(data);
AVELARDEV 0:010b908e2187 159 Wire.endTransmission();
AVELARDEV 0:010b908e2187 160 }
AVELARDEV 0:010b908e2187 161 */
AVELARDEV 0:010b908e2187 162
AVELARDEV 0:010b908e2187 163 bool MAX30100::writeRegister(uint8_t uch_addr, uint8_t uch_data)
AVELARDEV 0:010b908e2187 164 /**
AVELARDEV 0:010b908e2187 165 * \brief Write a value to a MAX30102 register
AVELARDEV 0:010b908e2187 166 * \par Details
AVELARDEV 0:010b908e2187 167 * This function writes a value to a MAX30102 register
AVELARDEV 0:010b908e2187 168 *
AVELARDEV 0:010b908e2187 169 * \param[in] uch_addr - register address
AVELARDEV 0:010b908e2187 170 * \param[in] uch_data - register data
AVELARDEV 0:010b908e2187 171 *
AVELARDEV 0:010b908e2187 172 * \retval true on success
AVELARDEV 0:010b908e2187 173 */
AVELARDEV 0:010b908e2187 174 {
AVELARDEV 0:010b908e2187 175 char ach_i2c_data[2];
AVELARDEV 0:010b908e2187 176 ach_i2c_data[0]=uch_addr;
AVELARDEV 0:010b908e2187 177 ach_i2c_data[1]=uch_data;
AVELARDEV 0:010b908e2187 178
condato_mbed 1:a9cc51956082 179 if(i2c.write(I2C_WRITE_ADDR, ach_i2c_data, 2, false)==0)
AVELARDEV 0:010b908e2187 180 return true;
AVELARDEV 0:010b908e2187 181 else
AVELARDEV 0:010b908e2187 182 return false;
AVELARDEV 0:010b908e2187 183 }
AVELARDEV 0:010b908e2187 184
AVELARDEV 0:010b908e2187 185 bool MAX30100::readFifoData()
AVELARDEV 0:010b908e2187 186 {
AVELARDEV 0:010b908e2187 187 char ach_i2c_data[4];
AVELARDEV 0:010b908e2187 188
AVELARDEV 0:010b908e2187 189 ach_i2c_data[0]=MAX30100_REG_FIFO_DATA;
condato_mbed 1:a9cc51956082 190 if(i2c.write(I2C_WRITE_ADDR, ach_i2c_data, 1, true)!=0)
AVELARDEV 0:010b908e2187 191 return false;
condato_mbed 1:a9cc51956082 192 if(i2c.read(I2C_READ_ADDR, ach_i2c_data, 4, false)!=0)
AVELARDEV 0:010b908e2187 193 return false;
AVELARDEV 0:010b908e2187 194
AVELARDEV 0:010b908e2187 195 // Warning: the values are always left-aligned
AVELARDEV 0:010b908e2187 196 rawIRValue = (ach_i2c_data[0] << 8) | ach_i2c_data[1];
AVELARDEV 0:010b908e2187 197 rawRedValue = (ach_i2c_data[2] << 8) | ach_i2c_data[3];
AVELARDEV 0:010b908e2187 198
AVELARDEV 0:010b908e2187 199 return true;
AVELARDEV 0:010b908e2187 200 }