Dimiter K / MAX30101

Hexiwear Heart rate sensor driver

Dependents:   Hexi_MAX30101 Hexiwear HexiwearFinal HexiwearFinal1

Fork of FXOS8700 by Aswin Sivakumar

MAX30101.cpp@4:3be008e67345, 2016-09-04 (annotated)

Committer:
DimiterK
Date:
Sun Sep 04 22:37:38 2016 +0000
Revision:
4:3be008e67345
Parent:
3:4bfb42d6c70c 
First revision , not yet operational

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DimiterK 3:4bfb42d6c70c 1 #include "MAX30101.h"
AswinSivakumar 0:a4ffc3c3e770 2 #include "mbed.h"
AswinSivakumar 0:a4ffc3c3e770 3
DimiterK 3:4bfb42d6c70c 4
DimiterK 4:3be008e67345 5 MAX30101::MAX30101(PinName sda, PinName scl) : m_i2c(sda, scl){
DimiterK 3:4bfb42d6c70c 6 // mode (HR, SpO2, or multi-led)
DimiterK 3:4bfb42d6c70c 7 mode = modeMultiLED;
DimiterK 3:4bfb42d6c70c 8
DimiterK 4:3be008e67345 9 m_addr = MAX30101_I2C_ADDRESS;
DimiterK 3:4bfb42d6c70c 10 // LED currents
DimiterK 3:4bfb42d6c70c 11 LEDCurrentRed = 0;
DimiterK 3:4bfb42d6c70c 12 LEDCurrentIR = 0;
DimiterK 3:4bfb42d6c70c 13 LEDCurrentGreen = 0;
DimiterK 3:4bfb42d6c70c 14
DimiterK 3:4bfb42d6c70c 15 // timings
DimiterK 3:4bfb42d6c70c 16 sampleRate = sampleRate_50;
DimiterK 3:4bfb42d6c70c 17 pulseWidth = ledPower_411;
DimiterK 3:4bfb42d6c70c 18 // ADC range
DimiterK 3:4bfb42d6c70c 19 range = adcRange8192;
DimiterK 3:4bfb42d6c70c 20 // averaging
DimiterK 3:4bfb42d6c70c 21 oversample = ovsNone;
DimiterK 3:4bfb42d6c70c 22
DimiterK 3:4bfb42d6c70c 23 // writeRegister(MAX30101_LED1RedPulseAmplitude, 0xFF );
DimiterK 3:4bfb42d6c70c 24 // writeRegister(MAX30101_LED2IrPulseAmplitude, 0x33 );
DimiterK 3:4bfb42d6c70c 25 // writeRegister(MAX30101_LED3GreenPulseAmplitude, 0xFF );
DimiterK 3:4bfb42d6c70c 26 // writeRegister(MAX30101_ProximityModePulseAmplitude, 0x19 );
DimiterK 3:4bfb42d6c70c 27 //
DimiterK 3:4bfb42d6c70c 28 // writeRegister( MAX30101_MultiLEDModeControlTime2Time1, 0x03 );
DimiterK 3:4bfb42d6c70c 29 // writeRegister( MAX30101_MultiLEDModeControlTime4Time3, 0x00 );
DimiterK 3:4bfb42d6c70c 30 //
DimiterK 3:4bfb42d6c70c 31 // writeRegister( MAX30101_FIFOConfiguration , 0x06 );
DimiterK 3:4bfb42d6c70c 32 // writeRegister( MAX30101_SPO2Configuration , 0x43 );
DimiterK 4:3be008e67345 33
DimiterK 4:3be008e67345 34 writeRegister(MAX30101_ProximityInterruptThreshold , 0x14 );
DimiterK 4:3be008e67345 35
DimiterK 4:3be008e67345 36 /** clear FIFO pointers */
DimiterK 4:3be008e67345 37 writeRegister(MAX30101_FIFO_WR_PTR , 0 );
DimiterK 4:3be008e67345 38 writeRegister(MAX30101_FIFO_RD_PTR , 0 );
DimiterK 4:3be008e67345 39 writeRegister(MAX30101_FIFO_OV_PTR , 0 );
DimiterK 3:4bfb42d6c70c 40
DimiterK 3:4bfb42d6c70c 41 }
DimiterK 3:4bfb42d6c70c 42
DimiterK 3:4bfb42d6c70c 43 MAX30101::~MAX30101() { }
DimiterK 3:4bfb42d6c70c 44
DimiterK 3:4bfb42d6c70c 45
DimiterK 3:4bfb42d6c70c 46 void MAX30101::enable(void)
AswinSivakumar 0:a4ffc3c3e770 47 {
DimiterK 3:4bfb42d6c70c 48
DimiterK 3:4bfb42d6c70c 49 writeRegister( MAX30101_InterruptEnable1 , 0x10 );
DimiterK 3:4bfb42d6c70c 50 writeRegister( MAX30101_ModeConfiguration , 0x07 );
DimiterK 3:4bfb42d6c70c 51
AswinSivakumar 0:a4ffc3c3e770 52 }
AswinSivakumar 0:a4ffc3c3e770 53
DimiterK 3:4bfb42d6c70c 54 void MAX30101::shutdown(void)
AswinSivakumar 0:a4ffc3c3e770 55 {
DimiterK 3:4bfb42d6c70c 56 writeRegister(MAX30101_ModeConfiguration,SHDN);
AswinSivakumar 0:a4ffc3c3e770 57
AswinSivakumar 0:a4ffc3c3e770 58 }
AswinSivakumar 0:a4ffc3c3e770 59
DimiterK 3:4bfb42d6c70c 60 max30101_status_t MAX30101::reset(void)
AswinSivakumar 0:a4ffc3c3e770 61 {
DimiterK 3:4bfb42d6c70c 62 writeRegister(MAX30101_ModeConfiguration,RESET);
DimiterK 3:4bfb42d6c70c 63
DimiterK 3:4bfb42d6c70c 64 while (1)
DimiterK 3:4bfb42d6c70c 65 {
DimiterK 3:4bfb42d6c70c 66 uint8_t status = readRegister( MAX30101_ModeConfiguration );
AswinSivakumar 0:a4ffc3c3e770 67
DimiterK 3:4bfb42d6c70c 68 if ( 0 == ( status & RESET ) )
DimiterK 3:4bfb42d6c70c 69 {
DimiterK 3:4bfb42d6c70c 70 return STATUS_MAXIM_SUCCESS;
DimiterK 3:4bfb42d6c70c 71 }
DimiterK 3:4bfb42d6c70c 72 }
AswinSivakumar 0:a4ffc3c3e770 73
AswinSivakumar 0:a4ffc3c3e770 74 }
AswinSivakumar 0:a4ffc3c3e770 75
DimiterK 3:4bfb42d6c70c 76 void MAX30101::setMode(max30101_mode_t sensorMode)
AswinSivakumar 0:a4ffc3c3e770 77 {
DimiterK 3:4bfb42d6c70c 78
DimiterK 3:4bfb42d6c70c 79 }
DimiterK 3:4bfb42d6c70c 80
DimiterK 3:4bfb42d6c70c 81 void MAX30101::setSPO2_ADC_range(void)
DimiterK 3:4bfb42d6c70c 82 {
DimiterK 3:4bfb42d6c70c 83
AswinSivakumar 0:a4ffc3c3e770 84
AswinSivakumar 0:a4ffc3c3e770 85 }
AswinSivakumar 0:a4ffc3c3e770 86
DimiterK 3:4bfb42d6c70c 87
DimiterK 3:4bfb42d6c70c 88 void MAX30101::set_SPO2_sampleRange(void)
DimiterK 3:4bfb42d6c70c 89 {
DimiterK 3:4bfb42d6c70c 90
DimiterK 3:4bfb42d6c70c 91 }
DimiterK 3:4bfb42d6c70c 92
DimiterK 3:4bfb42d6c70c 93 void MAX30101::set_LED_PulseWidth(uint8_t pw)
DimiterK 3:4bfb42d6c70c 94 {
DimiterK 3:4bfb42d6c70c 95
DimiterK 3:4bfb42d6c70c 96 }
DimiterK 3:4bfb42d6c70c 97
DimiterK 3:4bfb42d6c70c 98 max30101_status_t MAX30101::readRawData(uint8_t* dataBuff, uint8_t* sampleNum )
AswinSivakumar 0:a4ffc3c3e770 99 {
DimiterK 3:4bfb42d6c70c 100 // temporary buffer to read samples from the FIFO buffer
DimiterK 3:4bfb42d6c70c 101 uint8_t tmpBuf[ MAXIM_FIFO_DEPTH * MAXIM_BYTES_PER_ADC_VALUE ];
DimiterK 3:4bfb42d6c70c 102
DimiterK 3:4bfb42d6c70c 103 uint8_t numAvailSam;
DimiterK 3:4bfb42d6c70c 104
DimiterK 3:4bfb42d6c70c 105 // read FIFO pointers
DimiterK 3:4bfb42d6c70c 106 uint8_t fifoWrPtr = readRegister( MAX30101_FIFO_WR_PTR );
DimiterK 3:4bfb42d6c70c 107 uint8_t fifoRdPtr = readRegister( MAX30101_FIFO_RD_PTR );
DimiterK 3:4bfb42d6c70c 108 uint8_t fifoOvPtr = readRegister( MAX30101_FIFO_OV_PTR );
DimiterK 3:4bfb42d6c70c 109
DimiterK 3:4bfb42d6c70c 110 // overflow happened
DimiterK 3:4bfb42d6c70c 111 if ( fifoOvPtr > 0 )
DimiterK 3:4bfb42d6c70c 112 {
DimiterK 3:4bfb42d6c70c 113 uint8_t cmd = MAX30101_FIFO_DATA ;
DimiterK 3:4bfb42d6c70c 114 readRegs(cmd,tmpBuf,100);
DimiterK 3:4bfb42d6c70c 115 numAvailSam = 0xFF;
DimiterK 3:4bfb42d6c70c 116 }
DimiterK 3:4bfb42d6c70c 117
DimiterK 3:4bfb42d6c70c 118 else
DimiterK 3:4bfb42d6c70c 119 {
DimiterK 3:4bfb42d6c70c 120 if ( fifoWrPtr > fifoRdPtr )
DimiterK 3:4bfb42d6c70c 121 {
DimiterK 3:4bfb42d6c70c 122 /**
DimiterK 3:4bfb42d6c70c 123 * NUM_AVAILABLE_SAMPLES = FIFO_WR_PTR – FIFO_RD_PTR
DimiterK 3:4bfb42d6c70c 124 * NUM_SAMPLES_TO_READ = < less than or equal to NUM_AVAILABLE_SAMPLES >
DimiterK 3:4bfb42d6c70c 125 */
DimiterK 3:4bfb42d6c70c 126 numAvailSam = fifoWrPtr - fifoRdPtr;
DimiterK 3:4bfb42d6c70c 127 }
DimiterK 3:4bfb42d6c70c 128
DimiterK 3:4bfb42d6c70c 129 // note: pointer wrap around should be taken into account
DimiterK 3:4bfb42d6c70c 130 else if ( fifoWrPtr < fifoRdPtr )
DimiterK 3:4bfb42d6c70c 131 {
DimiterK 3:4bfb42d6c70c 132 numAvailSam = fifoWrPtr + MAXIM_FIFO_DEPTH - fifoRdPtr;
DimiterK 3:4bfb42d6c70c 133 }
DimiterK 3:4bfb42d6c70c 134
DimiterK 3:4bfb42d6c70c 135 // no new samples available
DimiterK 3:4bfb42d6c70c 136 else
DimiterK 3:4bfb42d6c70c 137 {
DimiterK 3:4bfb42d6c70c 138 numAvailSam = 0;
DimiterK 3:4bfb42d6c70c 139 }
DimiterK 3:4bfb42d6c70c 140
DimiterK 3:4bfb42d6c70c 141 if ( numAvailSam > 0 )
DimiterK 3:4bfb42d6c70c 142 {
DimiterK 3:4bfb42d6c70c 143 uint8_t cmd = MAX30101_FIFO_DATA ;
DimiterK 3:4bfb42d6c70c 144
DimiterK 3:4bfb42d6c70c 145 /**
DimiterK 3:4bfb42d6c70c 146 * read all the available samples,
DimiterK 3:4bfb42d6c70c 147 * FIFO RD pointer is implicitly incremented after each successful sample read
DimiterK 3:4bfb42d6c70c 148 */
DimiterK 3:4bfb42d6c70c 149 readRegs(cmd,tmpBuf,100);
DimiterK 3:4bfb42d6c70c 150
DimiterK 3:4bfb42d6c70c 151 if ( NULL != dataBuff )
DimiterK 3:4bfb42d6c70c 152 {
DimiterK 3:4bfb42d6c70c 153 memcpy (
DimiterK 3:4bfb42d6c70c 154 (void*)dataBuff,
DimiterK 3:4bfb42d6c70c 155 (const void*)tmpBuf,
DimiterK 3:4bfb42d6c70c 156 numAvailSam * MAXIM_BYTES_PER_ADC_VALUE
DimiterK 3:4bfb42d6c70c 157 );
DimiterK 3:4bfb42d6c70c 158 }
DimiterK 3:4bfb42d6c70c 159 }
DimiterK 3:4bfb42d6c70c 160 }
DimiterK 3:4bfb42d6c70c 161
DimiterK 3:4bfb42d6c70c 162 /** save data */
DimiterK 3:4bfb42d6c70c 163
DimiterK 3:4bfb42d6c70c 164 if ( NULL != sampleNum )
DimiterK 3:4bfb42d6c70c 165 {
DimiterK 3:4bfb42d6c70c 166 *sampleNum = numAvailSam;
DimiterK 3:4bfb42d6c70c 167 }
DimiterK 3:4bfb42d6c70c 168
DimiterK 3:4bfb42d6c70c 169
DimiterK 3:4bfb42d6c70c 170 return STATUS_MAXIM_SUCCESS;
DimiterK 3:4bfb42d6c70c 171 }
DimiterK 3:4bfb42d6c70c 172
DimiterK 3:4bfb42d6c70c 173 float MAX30101::getTemp(void)
DimiterK 3:4bfb42d6c70c 174 {
DimiterK 3:4bfb42d6c70c 175 float temp = 0;
DimiterK 3:4bfb42d6c70c 176
DimiterK 3:4bfb42d6c70c 177 return temp;
DimiterK 3:4bfb42d6c70c 178 }
DimiterK 3:4bfb42d6c70c 179
DimiterK 3:4bfb42d6c70c 180 float MAX30101::getDieTemp(void)
DimiterK 3:4bfb42d6c70c 181 {
DimiterK 3:4bfb42d6c70c 182 float dieTemp = 0;
DimiterK 3:4bfb42d6c70c 183
DimiterK 3:4bfb42d6c70c 184
DimiterK 3:4bfb42d6c70c 185 return dieTemp;
DimiterK 3:4bfb42d6c70c 186
DimiterK 3:4bfb42d6c70c 187 }
DimiterK 3:4bfb42d6c70c 188
DimiterK 3:4bfb42d6c70c 189 uint8_t MAX30101::getRevisionID(void)
DimiterK 3:4bfb42d6c70c 190 {
DimiterK 3:4bfb42d6c70c 191 uint8_t chipid = 0;
DimiterK 3:4bfb42d6c70c 192
DimiterK 3:4bfb42d6c70c 193 readRegs(MAX30101_DeviceID, &chipid, 1);
DimiterK 3:4bfb42d6c70c 194 return chipid;
DimiterK 3:4bfb42d6c70c 195 }
AswinSivakumar 0:a4ffc3c3e770 196
DimiterK 3:4bfb42d6c70c 197 uint8_t MAX30101::getChipID(void)
DimiterK 3:4bfb42d6c70c 198 {
DimiterK 3:4bfb42d6c70c 199 uint8_t chipid = 0;
DimiterK 3:4bfb42d6c70c 200
DimiterK 3:4bfb42d6c70c 201 readRegs(MAX30101_DeviceID, &chipid, 1);
DimiterK 3:4bfb42d6c70c 202 return chipid;
AswinSivakumar 0:a4ffc3c3e770 203 }
AswinSivakumar 0:a4ffc3c3e770 204
DimiterK 3:4bfb42d6c70c 205 void MAX30101::readRegs(int addr, uint8_t * data, int len)
DimiterK 3:4bfb42d6c70c 206 {
DimiterK 3:4bfb42d6c70c 207 char t[1] = {addr};
DimiterK 3:4bfb42d6c70c 208 m_i2c.write(m_addr, t, 1, true);
DimiterK 3:4bfb42d6c70c 209 m_i2c.read(m_addr, (char *)data, len);
DimiterK 3:4bfb42d6c70c 210 }
DimiterK 3:4bfb42d6c70c 211
DimiterK 3:4bfb42d6c70c 212 void MAX30101::writeRegs(uint8_t * data, int len)
DimiterK 3:4bfb42d6c70c 213 {
DimiterK 3:4bfb42d6c70c 214 m_i2c.write(m_addr, (char *)data, len);
DimiterK 3:4bfb42d6c70c 215 }
DimiterK 3:4bfb42d6c70c 216
DimiterK 3:4bfb42d6c70c 217
DimiterK 3:4bfb42d6c70c 218 uint8_t MAX30101::readRegister( uint8_t regaddr)
DimiterK 3:4bfb42d6c70c 219 {
DimiterK 3:4bfb42d6c70c 220 uint8_t data = 0;
DimiterK 3:4bfb42d6c70c 221 readRegs(regaddr, &data,1);
DimiterK 3:4bfb42d6c70c 222 return data;
DimiterK 3:4bfb42d6c70c 223 }
DimiterK 3:4bfb42d6c70c 224
DimiterK 3:4bfb42d6c70c 225 void MAX30101::writeRegister(uint8_t regaddr, uint8_t data)
DimiterK 3:4bfb42d6c70c 226 {
DimiterK 3:4bfb42d6c70c 227 uint8_t i2data[2]= {regaddr, data};
DimiterK 3:4bfb42d6c70c 228
DimiterK 3:4bfb42d6c70c 229 writeRegs(i2data, 2);
DimiterK 3:4bfb42d6c70c 230 }
AswinSivakumar 0:a4ffc3c3e770 231