Maxim Integrated's IoT development kit.
Dependencies: MAX30101 MAX30003 MAX113XX_Pixi MAX30205 max32630fthr USBDevice
max30101_algo.cpp@1:efe9cad8942f, 2018-03-13 (annotated)
- Committer:
- Mahir Ozturk
- Date:
- Tue Mar 13 14:52:59 2018 +0300
- Revision:
- 1:efe9cad8942f
- Child:
- 12:1300cb0f6274
Commit project files
Change-Id: I2188228f2a27e9a13e2407846e48b38c2596caa0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Mahir Ozturk |
1:efe9cad8942f | 1 | /******************************************************************************* |
Mahir Ozturk |
1:efe9cad8942f | 2 | * Copyright (C) 2018 Maxim Integrated Products, Inc., All Rights Reserved. |
Mahir Ozturk |
1:efe9cad8942f | 3 | * |
Mahir Ozturk |
1:efe9cad8942f | 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
Mahir Ozturk |
1:efe9cad8942f | 5 | * copy of this software and associated documentation files (the "Software"), |
Mahir Ozturk |
1:efe9cad8942f | 6 | * to deal in the Software without restriction, including without limitation |
Mahir Ozturk |
1:efe9cad8942f | 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
Mahir Ozturk |
1:efe9cad8942f | 8 | * and/or sell copies of the Software, and to permit persons to whom the |
Mahir Ozturk |
1:efe9cad8942f | 9 | * Software is furnished to do so, subject to the following conditions: |
Mahir Ozturk |
1:efe9cad8942f | 10 | * |
Mahir Ozturk |
1:efe9cad8942f | 11 | * The above copyright notice and this permission notice shall be included |
Mahir Ozturk |
1:efe9cad8942f | 12 | * in all copies or substantial portions of the Software. |
Mahir Ozturk |
1:efe9cad8942f | 13 | * |
Mahir Ozturk |
1:efe9cad8942f | 14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
Mahir Ozturk |
1:efe9cad8942f | 15 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
Mahir Ozturk |
1:efe9cad8942f | 16 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
Mahir Ozturk |
1:efe9cad8942f | 17 | * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES |
Mahir Ozturk |
1:efe9cad8942f | 18 | * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
Mahir Ozturk |
1:efe9cad8942f | 19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
Mahir Ozturk |
1:efe9cad8942f | 20 | * OTHER DEALINGS IN THE SOFTWARE. |
Mahir Ozturk |
1:efe9cad8942f | 21 | * |
Mahir Ozturk |
1:efe9cad8942f | 22 | * Except as contained in this notice, the name of Maxim Integrated |
Mahir Ozturk |
1:efe9cad8942f | 23 | * Products, Inc. shall not be used except as stated in the Maxim Integrated |
Mahir Ozturk |
1:efe9cad8942f | 24 | * Products, Inc. Branding Policy. |
Mahir Ozturk |
1:efe9cad8942f | 25 | * |
Mahir Ozturk |
1:efe9cad8942f | 26 | * The mere transfer of this software does not imply any licenses |
Mahir Ozturk |
1:efe9cad8942f | 27 | * of trade secrets, proprietary technology, copyrights, patents, |
Mahir Ozturk |
1:efe9cad8942f | 28 | * trademarks, maskwork rights, or any other form of intellectual |
Mahir Ozturk |
1:efe9cad8942f | 29 | * property whatsoever. Maxim Integrated Products, Inc. retains all |
Mahir Ozturk |
1:efe9cad8942f | 30 | * ownership rights. |
Mahir Ozturk |
1:efe9cad8942f | 31 | ******************************************************************************* |
Mahir Ozturk |
1:efe9cad8942f | 32 | */ |
Mahir Ozturk |
1:efe9cad8942f | 33 | |
Mahir Ozturk |
1:efe9cad8942f | 34 | #include "max30101_algo.h" |
Mahir Ozturk |
1:efe9cad8942f | 35 | |
Mahir Ozturk |
1:efe9cad8942f | 36 | //helper functions for the heart rate and SpO2 function |
Mahir Ozturk |
1:efe9cad8942f | 37 | uint16_t avg_dc_est(int32_t *p, uint16_t x); |
Mahir Ozturk |
1:efe9cad8942f | 38 | |
Mahir Ozturk |
1:efe9cad8942f | 39 | void lp_dfir_flt(int16_t din0, int16_t din1, int16_t din2, int16_t *dout0, int16_t *dout1, int16_t *dout2) ; |
Mahir Ozturk |
1:efe9cad8942f | 40 | int32_t mul16(int16_t x, int16_t y); |
Mahir Ozturk |
1:efe9cad8942f | 41 | |
Mahir Ozturk |
1:efe9cad8942f | 42 | // |
Mahir Ozturk |
1:efe9cad8942f | 43 | // Heart Rate/SpO2 Monitor function takes sample input 'dinIR' and dinRed. |
Mahir Ozturk |
1:efe9cad8942f | 44 | // Other inputs: |
Mahir Ozturk |
1:efe9cad8942f | 45 | // ns -> Sample Counter, increments with each sample input. |
Mahir Ozturk |
1:efe9cad8942f | 46 | // SampRate -> Input data real-time sample rate. |
Mahir Ozturk |
1:efe9cad8942f | 47 | // dinLShft -> Number of left shifts for data to be 16 bit wide. |
Mahir Ozturk |
1:efe9cad8942f | 48 | // compSpO2 -> If '1' compute SpO2 value,else compute HR only. |
Mahir Ozturk |
1:efe9cad8942f | 49 | |
Mahir Ozturk |
1:efe9cad8942f | 50 | // |
Mahir Ozturk |
1:efe9cad8942f | 51 | // Outputs: |
Mahir Ozturk |
1:efe9cad8942f | 52 | // ir_ac_comp -> AC component of the IR signal. |
Mahir Ozturk |
1:efe9cad8942f | 53 | // red_ac_comp -> AC component of the Red signal. |
Mahir Ozturk |
1:efe9cad8942f | 54 | // ir_ac_mag -> Peak to Peak magnitude of the IR signal. |
Mahir Ozturk |
1:efe9cad8942f | 55 | // red_ac_mag -> Peak to Peak magnitude of the Red signal. |
Mahir Ozturk |
1:efe9cad8942f | 56 | // HRbpm -> Heart Rate in beats per minute. |
Mahir Ozturk |
1:efe9cad8942f | 57 | // SpO2 -> SpO2 value as %saturation. |
Mahir Ozturk |
1:efe9cad8942f | 58 | // DRdy -> '1' when new data is available. |
Mahir Ozturk |
1:efe9cad8942f | 59 | // |
Mahir Ozturk |
1:efe9cad8942f | 60 | |
Mahir Ozturk |
1:efe9cad8942f | 61 | void HRSpO2Func(uint32_t dinIR, uint32_t dinRed, uint32_t dinGreen, uint32_t ns, uint16_t SampRate, uint16_t compSpO2, |
Mahir Ozturk |
1:efe9cad8942f | 62 | int16_t *ir_ac_comp, int16_t *red_ac_comp, int16_t *green_ac_comp, int16_t *ir_ac_mag, int16_t *red_ac_mag, |
Mahir Ozturk |
1:efe9cad8942f | 63 | int16_t *green_ac_mag, uint16_t *HRbpm2, uint16_t *SpO2B, uint16_t *DRdy) |
Mahir Ozturk |
1:efe9cad8942f | 64 | { |
Mahir Ozturk |
1:efe9cad8942f | 65 | static int32_t ir_avg_reg = 0; |
Mahir Ozturk |
1:efe9cad8942f | 66 | static int32_t red_avg_reg = 0; |
Mahir Ozturk |
1:efe9cad8942f | 67 | static int32_t green_avg_reg = 0; |
Mahir Ozturk |
1:efe9cad8942f | 68 | |
Mahir Ozturk |
1:efe9cad8942f | 69 | static int16_t ir_ac_sig_cur = 0; |
Mahir Ozturk |
1:efe9cad8942f | 70 | static int16_t ir_ac_sig_pre; |
Mahir Ozturk |
1:efe9cad8942f | 71 | static int16_t ir_ac_sig_min = 0; |
Mahir Ozturk |
1:efe9cad8942f | 72 | static int16_t ir_ac_sig_max = 0; |
Mahir Ozturk |
1:efe9cad8942f | 73 | static int16_t ir_avg_est; |
Mahir Ozturk |
1:efe9cad8942f | 74 | |
Mahir Ozturk |
1:efe9cad8942f | 75 | static int16_t ir_pedge = 0, ir_nedge = 0; |
Mahir Ozturk |
1:efe9cad8942f | 76 | static int16_t ir_pzxic, ir_pzxip; |
Mahir Ozturk |
1:efe9cad8942f | 77 | static int16_t ir_nzxic; |
Mahir Ozturk |
1:efe9cad8942f | 78 | |
Mahir Ozturk |
1:efe9cad8942f | 79 | static int16_t red_ac_sig_cur = 0; |
Mahir Ozturk |
1:efe9cad8942f | 80 | static int16_t red_ac_sig_min = 0; |
Mahir Ozturk |
1:efe9cad8942f | 81 | static int16_t red_ac_sig_max = 0; |
Mahir Ozturk |
1:efe9cad8942f | 82 | static int16_t red_avg_est; |
Mahir Ozturk |
1:efe9cad8942f | 83 | |
Mahir Ozturk |
1:efe9cad8942f | 84 | static int16_t green_avg_est; |
Mahir Ozturk |
1:efe9cad8942f | 85 | static int16_t green_ac_sig_cur = 0; |
Mahir Ozturk |
1:efe9cad8942f | 86 | //static int16_t green_ac_sig_cur=0; |
Mahir Ozturk |
1:efe9cad8942f | 87 | static int16_t green_ac_sig_pre; |
Mahir Ozturk |
1:efe9cad8942f | 88 | static int16_t green_ac_sig_max ; |
Mahir Ozturk |
1:efe9cad8942f | 89 | static int16_t green_ac_sig_min; |
Mahir Ozturk |
1:efe9cad8942f | 90 | static int16_t green_mac_FIFO[5]; |
Mahir Ozturk |
1:efe9cad8942f | 91 | int16_t meanGreenMagFIFO; |
Mahir Ozturk |
1:efe9cad8942f | 92 | int16_t minAmpForHeartBeat ; |
Mahir Ozturk |
1:efe9cad8942f | 93 | |
Mahir Ozturk |
1:efe9cad8942f | 94 | uint32_t IRData, RedData, greenData, rnum, rden, rdens; |
Mahir Ozturk |
1:efe9cad8942f | 95 | uint16_t zeros_in_HrQue = 0, posCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 96 | static uint32_t prevPeakLoc = 0; |
Mahir Ozturk |
1:efe9cad8942f | 97 | static int16_t IrFIFO[100]; |
Mahir Ozturk |
1:efe9cad8942f | 98 | static int16_t HrQue[10], lastKnownGoodHr[10]; |
Mahir Ozturk |
1:efe9cad8942f | 99 | static int16_t SPO2Que[5]; |
Mahir Ozturk |
1:efe9cad8942f | 100 | int16_t SPO2score[5]; |
Mahir Ozturk |
1:efe9cad8942f | 101 | static uint16_t HrQindex = 0, lengthOfposCountExceeding = 0; |
Mahir Ozturk |
1:efe9cad8942f | 102 | static uint16_t initHrQueCounter = 0, fingerOff = 0; |
Mahir Ozturk |
1:efe9cad8942f | 103 | |
Mahir Ozturk |
1:efe9cad8942f | 104 | static int16_t HrQueSmoothing[3]; |
Mahir Ozturk |
1:efe9cad8942f | 105 | static int16_t SPO2QueSmoothing[3]; |
Mahir Ozturk |
1:efe9cad8942f | 106 | |
Mahir Ozturk |
1:efe9cad8942f | 107 | int16_t k, j; |
Mahir Ozturk |
1:efe9cad8942f | 108 | uint32_t peakLoc ; |
Mahir Ozturk |
1:efe9cad8942f | 109 | int16_t bufferIdx1, bufferIdx2; |
Mahir Ozturk |
1:efe9cad8942f | 110 | int16_t maxFIFO, IdxMaxFIFO ; |
Mahir Ozturk |
1:efe9cad8942f | 111 | int16_t HRperiod2, HRComp2, deltaHR; |
Mahir Ozturk |
1:efe9cad8942f | 112 | int16_t cSpO2, SpO2; |
Mahir Ozturk |
1:efe9cad8942f | 113 | |
Mahir Ozturk |
1:efe9cad8942f | 114 | int16_t HrCount = 0, HrSum = 0, meanGreenMagFIFOcounter = 0; |
Mahir Ozturk |
1:efe9cad8942f | 115 | int16_t SPO2D, meanHrQ; |
Mahir Ozturk |
1:efe9cad8942f | 116 | int16_t dx[99], cumsumX[99]; |
Mahir Ozturk |
1:efe9cad8942f | 117 | static int16_t SPO2QueCounter = 0 ; //, lastDisplayedHrValue; |
Mahir Ozturk |
1:efe9cad8942f | 118 | |
Mahir Ozturk |
1:efe9cad8942f | 119 | int16_t validSPO2Count = 0; |
Mahir Ozturk |
1:efe9cad8942f | 120 | int16_t validSPO2Sum = 0; |
Mahir Ozturk |
1:efe9cad8942f | 121 | int16_t SPO2scoreAverage = 0; |
Mahir Ozturk |
1:efe9cad8942f | 122 | int16_t SPO2scoreSum = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 123 | // int16_t deltaMeanLastKnownGoodHr = 0, meanLastKnownGoodHr = 0; |
Mahir Ozturk |
1:efe9cad8942f | 124 | // int16_t counterMeanLastKnownGoodHr = 0; |
Mahir Ozturk |
1:efe9cad8942f | 125 | |
Mahir Ozturk |
1:efe9cad8942f | 126 | |
Mahir Ozturk |
1:efe9cad8942f | 127 | /* clear some vars if fresh new start */ |
Mahir Ozturk |
1:efe9cad8942f | 128 | if ((ns == 0) || (fingerOff > 300)) { |
Mahir Ozturk |
1:efe9cad8942f | 129 | ir_avg_reg = 0; |
Mahir Ozturk |
1:efe9cad8942f | 130 | red_avg_reg = 0; |
Mahir Ozturk |
1:efe9cad8942f | 131 | green_avg_reg = 0; |
Mahir Ozturk |
1:efe9cad8942f | 132 | |
Mahir Ozturk |
1:efe9cad8942f | 133 | ir_ac_sig_cur = 0; |
Mahir Ozturk |
1:efe9cad8942f | 134 | ir_ac_sig_pre = 0; |
Mahir Ozturk |
1:efe9cad8942f | 135 | ir_ac_sig_min = 0; |
Mahir Ozturk |
1:efe9cad8942f | 136 | ir_ac_sig_max = 0; |
Mahir Ozturk |
1:efe9cad8942f | 137 | |
Mahir Ozturk |
1:efe9cad8942f | 138 | ir_avg_est = 0; |
Mahir Ozturk |
1:efe9cad8942f | 139 | green_avg_est = 0; |
Mahir Ozturk |
1:efe9cad8942f | 140 | red_avg_est = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 141 | |
Mahir Ozturk |
1:efe9cad8942f | 142 | ir_pedge = 0; |
Mahir Ozturk |
1:efe9cad8942f | 143 | ir_nedge = 0; |
Mahir Ozturk |
1:efe9cad8942f | 144 | ir_pzxic = 0; |
Mahir Ozturk |
1:efe9cad8942f | 145 | ir_pzxip = 0; |
Mahir Ozturk |
1:efe9cad8942f | 146 | ir_nzxic = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 147 | //ir_nzxip = 0; |
Mahir Ozturk |
1:efe9cad8942f | 148 | red_ac_sig_cur = 0; |
Mahir Ozturk |
1:efe9cad8942f | 149 | red_ac_sig_min = 0; |
Mahir Ozturk |
1:efe9cad8942f | 150 | red_ac_sig_max = 0; |
Mahir Ozturk |
1:efe9cad8942f | 151 | |
Mahir Ozturk |
1:efe9cad8942f | 152 | prevPeakLoc = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 153 | bufferIdx1 = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 154 | bufferIdx2 = 0; |
Mahir Ozturk |
1:efe9cad8942f | 155 | HrQindex = 0; |
Mahir Ozturk |
1:efe9cad8942f | 156 | initHrQueCounter = 0; |
Mahir Ozturk |
1:efe9cad8942f | 157 | lengthOfposCountExceeding = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 158 | fingerOff = 0; |
Mahir Ozturk |
1:efe9cad8942f | 159 | HRComp2 = 0; |
Mahir Ozturk |
1:efe9cad8942f | 160 | |
Mahir Ozturk |
1:efe9cad8942f | 161 | for (k = 0 ; k < 100 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 162 | IrFIFO[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 163 | } |
Mahir Ozturk |
1:efe9cad8942f | 164 | |
Mahir Ozturk |
1:efe9cad8942f | 165 | for (k = 0 ; k < 10 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 166 | HrQue[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 167 | lastKnownGoodHr[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 168 | } |
Mahir Ozturk |
1:efe9cad8942f | 169 | |
Mahir Ozturk |
1:efe9cad8942f | 170 | for (k = 0 ; k < 3 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 171 | HrQueSmoothing[k] = 70; |
Mahir Ozturk |
1:efe9cad8942f | 172 | SPO2QueSmoothing[k] = 97; |
Mahir Ozturk |
1:efe9cad8942f | 173 | } |
Mahir Ozturk |
1:efe9cad8942f | 174 | |
Mahir Ozturk |
1:efe9cad8942f | 175 | for (k = 0 ; k < 5 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 176 | SPO2Que[k] = 97; |
Mahir Ozturk |
1:efe9cad8942f | 177 | SPO2score[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 178 | green_mac_FIFO[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 179 | } |
Mahir Ozturk |
1:efe9cad8942f | 180 | |
Mahir Ozturk |
1:efe9cad8942f | 181 | SPO2QueCounter = 0; |
Mahir Ozturk |
1:efe9cad8942f | 182 | *SpO2B = 97; |
Mahir Ozturk |
1:efe9cad8942f | 183 | *HRbpm2 = 0; |
Mahir Ozturk |
1:efe9cad8942f | 184 | *DRdy = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 185 | } |
Mahir Ozturk |
1:efe9cad8942f | 186 | |
Mahir Ozturk |
1:efe9cad8942f | 187 | |
Mahir Ozturk |
1:efe9cad8942f | 188 | /* Save current state */ |
Mahir Ozturk |
1:efe9cad8942f | 189 | green_ac_sig_pre = green_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 190 | |
Mahir Ozturk |
1:efe9cad8942f | 191 | /* Process next data sample */ |
Mahir Ozturk |
1:efe9cad8942f | 192 | minAmpForHeartBeat = 0; |
Mahir Ozturk |
1:efe9cad8942f | 193 | IRData = dinIR; |
Mahir Ozturk |
1:efe9cad8942f | 194 | RedData = dinRed; |
Mahir Ozturk |
1:efe9cad8942f | 195 | greenData = dinGreen ; |
Mahir Ozturk |
1:efe9cad8942f | 196 | |
Mahir Ozturk |
1:efe9cad8942f | 197 | ir_avg_est = avg_dc_est(&ir_avg_reg, IRData); |
Mahir Ozturk |
1:efe9cad8942f | 198 | red_avg_est = avg_dc_est(&red_avg_reg, RedData); |
Mahir Ozturk |
1:efe9cad8942f | 199 | green_avg_est = avg_dc_est(&green_avg_reg, greenData); |
Mahir Ozturk |
1:efe9cad8942f | 200 | |
Mahir Ozturk |
1:efe9cad8942f | 201 | lp_dfir_flt((uint16_t)(IRData - ir_avg_est), (uint16_t)(RedData - red_avg_est), |
Mahir Ozturk |
1:efe9cad8942f | 202 | (uint16_t)(greenData - green_avg_est), &ir_ac_sig_cur, &red_ac_sig_cur, &green_ac_sig_cur); |
Mahir Ozturk |
1:efe9cad8942f | 203 | |
Mahir Ozturk |
1:efe9cad8942f | 204 | *ir_ac_comp = ir_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 205 | *red_ac_comp = red_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 206 | *green_ac_comp = green_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 207 | |
Mahir Ozturk |
1:efe9cad8942f | 208 | /* save to FIFO */ |
Mahir Ozturk |
1:efe9cad8942f | 209 | for (k = 1 ; k < 100 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 210 | IrFIFO[100 - k] = IrFIFO[99 - k]; |
Mahir Ozturk |
1:efe9cad8942f | 211 | } |
Mahir Ozturk |
1:efe9cad8942f | 212 | IrFIFO[0] = green_ac_sig_cur ; // invert |
Mahir Ozturk |
1:efe9cad8942f | 213 | for (k = 0 ; k < 97 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 214 | dx[k] = IrFIFO[k + 2] - IrFIFO[k] ; |
Mahir Ozturk |
1:efe9cad8942f | 215 | } |
Mahir Ozturk |
1:efe9cad8942f | 216 | dx[97] = dx[96]; |
Mahir Ozturk |
1:efe9cad8942f | 217 | dx[98] = dx[96]; |
Mahir Ozturk |
1:efe9cad8942f | 218 | |
Mahir Ozturk |
1:efe9cad8942f | 219 | for (k = 0 ; k < 99 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 220 | if (dx[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 221 | dx[k] = 1; |
Mahir Ozturk |
1:efe9cad8942f | 222 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 223 | dx[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 224 | } |
Mahir Ozturk |
1:efe9cad8942f | 225 | } |
Mahir Ozturk |
1:efe9cad8942f | 226 | |
Mahir Ozturk |
1:efe9cad8942f | 227 | cumsumX[0] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 228 | for (k = 1; k < 99 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 229 | if (dx[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 230 | cumsumX[k] = cumsumX[k - 1] + dx[k] ; |
Mahir Ozturk |
1:efe9cad8942f | 231 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 232 | cumsumX[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 233 | } |
Mahir Ozturk |
1:efe9cad8942f | 234 | } |
Mahir Ozturk |
1:efe9cad8942f | 235 | |
Mahir Ozturk |
1:efe9cad8942f | 236 | /* determine noise |
Mahir Ozturk |
1:efe9cad8942f | 237 | * ignore less than 3 consecutive non-zeros's |
Mahir Ozturk |
1:efe9cad8942f | 238 | * detect # of sign change |
Mahir Ozturk |
1:efe9cad8942f | 239 | */ |
Mahir Ozturk |
1:efe9cad8942f | 240 | posCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 241 | for (k = 1; k < 99 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 242 | if (cumsumX[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 243 | posCount ++ ; |
Mahir Ozturk |
1:efe9cad8942f | 244 | } else if (cumsumX[k] == 0) { |
Mahir Ozturk |
1:efe9cad8942f | 245 | if (posCount < 4 && k >= 4) { |
Mahir Ozturk |
1:efe9cad8942f | 246 | for (j = k - 1; j > k - posCount - 1; j--) { |
Mahir Ozturk |
1:efe9cad8942f | 247 | cumsumX[j] = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 248 | } |
Mahir Ozturk |
1:efe9cad8942f | 249 | } |
Mahir Ozturk |
1:efe9cad8942f | 250 | posCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 251 | } |
Mahir Ozturk |
1:efe9cad8942f | 252 | } |
Mahir Ozturk |
1:efe9cad8942f | 253 | |
Mahir Ozturk |
1:efe9cad8942f | 254 | /* ignore less than 3 consecutive zeros's */ |
Mahir Ozturk |
1:efe9cad8942f | 255 | posCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 256 | for (k = 1; k < 99 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 257 | if (cumsumX[k] == 0) { |
Mahir Ozturk |
1:efe9cad8942f | 258 | posCount ++ ; |
Mahir Ozturk |
1:efe9cad8942f | 259 | } else if (cumsumX[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 260 | if (posCount < 4 && k >= 4) { |
Mahir Ozturk |
1:efe9cad8942f | 261 | for (j = k - 1; j > k - posCount - 1; j--) { |
Mahir Ozturk |
1:efe9cad8942f | 262 | cumsumX[j] = 100 ; |
Mahir Ozturk |
1:efe9cad8942f | 263 | } |
Mahir Ozturk |
1:efe9cad8942f | 264 | } |
Mahir Ozturk |
1:efe9cad8942f | 265 | posCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 266 | } |
Mahir Ozturk |
1:efe9cad8942f | 267 | } |
Mahir Ozturk |
1:efe9cad8942f | 268 | |
Mahir Ozturk |
1:efe9cad8942f | 269 | /* detect # of sign change */ |
Mahir Ozturk |
1:efe9cad8942f | 270 | posCount = 0; /* sign change counter */ |
Mahir Ozturk |
1:efe9cad8942f | 271 | for (k = 0; k < 98 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 272 | if (cumsumX[k] == 0 && cumsumX[k + 1] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 273 | posCount ++; |
Mahir Ozturk |
1:efe9cad8942f | 274 | } |
Mahir Ozturk |
1:efe9cad8942f | 275 | } |
Mahir Ozturk |
1:efe9cad8942f | 276 | if (posCount >= 4) { |
Mahir Ozturk |
1:efe9cad8942f | 277 | lengthOfposCountExceeding ++ ; |
Mahir Ozturk |
1:efe9cad8942f | 278 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 279 | lengthOfposCountExceeding = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 280 | } |
Mahir Ozturk |
1:efe9cad8942f | 281 | |
Mahir Ozturk |
1:efe9cad8942f | 282 | /* Detect IR channel positive zero crossing (rising edge) */ |
Mahir Ozturk |
1:efe9cad8942f | 283 | if ((green_ac_sig_pre < 0) && (green_ac_sig_cur >= 0) && fingerOff == 0) { |
Mahir Ozturk |
1:efe9cad8942f | 284 | *ir_ac_mag = ir_ac_sig_max - ir_ac_sig_min; |
Mahir Ozturk |
1:efe9cad8942f | 285 | *red_ac_mag = red_ac_sig_max - red_ac_sig_min; |
Mahir Ozturk |
1:efe9cad8942f | 286 | *green_ac_mag = green_ac_sig_max - green_ac_sig_min; |
Mahir Ozturk |
1:efe9cad8942f | 287 | if (*green_ac_mag > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 288 | for (k = 0; k < 4 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 289 | green_mac_FIFO[k] = green_mac_FIFO[k + 1]; |
Mahir Ozturk |
1:efe9cad8942f | 290 | } |
Mahir Ozturk |
1:efe9cad8942f | 291 | green_mac_FIFO[4] = *green_ac_mag ; |
Mahir Ozturk |
1:efe9cad8942f | 292 | if (green_mac_FIFO[4] > 1000) { |
Mahir Ozturk |
1:efe9cad8942f | 293 | green_mac_FIFO[4] = 1000; |
Mahir Ozturk |
1:efe9cad8942f | 294 | } |
Mahir Ozturk |
1:efe9cad8942f | 295 | } |
Mahir Ozturk |
1:efe9cad8942f | 296 | meanGreenMagFIFO = 0; |
Mahir Ozturk |
1:efe9cad8942f | 297 | meanGreenMagFIFOcounter = 0; |
Mahir Ozturk |
1:efe9cad8942f | 298 | for (k = 0; k < 5 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 299 | if (green_mac_FIFO[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 300 | meanGreenMagFIFO = meanGreenMagFIFO + green_mac_FIFO[k] ; |
Mahir Ozturk |
1:efe9cad8942f | 301 | meanGreenMagFIFOcounter++; |
Mahir Ozturk |
1:efe9cad8942f | 302 | } |
Mahir Ozturk |
1:efe9cad8942f | 303 | } |
Mahir Ozturk |
1:efe9cad8942f | 304 | if (meanGreenMagFIFOcounter >= 2) { |
Mahir Ozturk |
1:efe9cad8942f | 305 | meanGreenMagFIFO = meanGreenMagFIFO / meanGreenMagFIFOcounter ; |
Mahir Ozturk |
1:efe9cad8942f | 306 | minAmpForHeartBeat = meanGreenMagFIFO / 4 ; //25% of mean of past heart beat |
Mahir Ozturk |
1:efe9cad8942f | 307 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 308 | minAmpForHeartBeat = 75; |
Mahir Ozturk |
1:efe9cad8942f | 309 | } |
Mahir Ozturk |
1:efe9cad8942f | 310 | if (minAmpForHeartBeat < 75) { |
Mahir Ozturk |
1:efe9cad8942f | 311 | minAmpForHeartBeat = 75; |
Mahir Ozturk |
1:efe9cad8942f | 312 | } |
Mahir Ozturk |
1:efe9cad8942f | 313 | if (minAmpForHeartBeat > 400) { |
Mahir Ozturk |
1:efe9cad8942f | 314 | minAmpForHeartBeat = 400; |
Mahir Ozturk |
1:efe9cad8942f | 315 | } |
Mahir Ozturk |
1:efe9cad8942f | 316 | |
Mahir Ozturk |
1:efe9cad8942f | 317 | ir_pedge = 1; |
Mahir Ozturk |
1:efe9cad8942f | 318 | ir_nedge = 0; |
Mahir Ozturk |
1:efe9cad8942f | 319 | ir_ac_sig_max = 0; |
Mahir Ozturk |
1:efe9cad8942f | 320 | ir_pzxip = ir_pzxic; |
Mahir Ozturk |
1:efe9cad8942f | 321 | ir_pzxic = ns; |
Mahir Ozturk |
1:efe9cad8942f | 322 | bufferIdx1 = ir_pzxic - ir_nzxic; |
Mahir Ozturk |
1:efe9cad8942f | 323 | bufferIdx2 = ir_pzxic - ir_pzxip; |
Mahir Ozturk |
1:efe9cad8942f | 324 | |
Mahir Ozturk |
1:efe9cad8942f | 325 | if ((*green_ac_mag) > minAmpForHeartBeat && (*green_ac_mag) < 20000 && bufferIdx1 >= 0 |
Mahir Ozturk |
1:efe9cad8942f | 326 | && bufferIdx1 < 100 && bufferIdx2 >= 0 && bufferIdx2 < 100 && bufferIdx1 < bufferIdx2) { // was <5000 |
Mahir Ozturk |
1:efe9cad8942f | 327 | maxFIFO = -32766; |
Mahir Ozturk |
1:efe9cad8942f | 328 | |
Mahir Ozturk |
1:efe9cad8942f | 329 | IdxMaxFIFO = 0; |
Mahir Ozturk |
1:efe9cad8942f | 330 | for (j = bufferIdx1; j <= bufferIdx2; j++) { // find max peak |
Mahir Ozturk |
1:efe9cad8942f | 331 | if (IrFIFO[j] > maxFIFO) { |
Mahir Ozturk |
1:efe9cad8942f | 332 | maxFIFO = IrFIFO[j]; |
Mahir Ozturk |
1:efe9cad8942f | 333 | IdxMaxFIFO = j; |
Mahir Ozturk |
1:efe9cad8942f | 334 | } |
Mahir Ozturk |
1:efe9cad8942f | 335 | } |
Mahir Ozturk |
1:efe9cad8942f | 336 | peakLoc = ir_pzxic - IdxMaxFIFO + 1 ; |
Mahir Ozturk |
1:efe9cad8942f | 337 | |
Mahir Ozturk |
1:efe9cad8942f | 338 | if (prevPeakLoc != 0) { |
Mahir Ozturk |
1:efe9cad8942f | 339 | HRperiod2 = (uint16_t)(peakLoc - prevPeakLoc); |
Mahir Ozturk |
1:efe9cad8942f | 340 | if (HRperiod2 > 33 && HRperiod2 < 134) { |
Mahir Ozturk |
1:efe9cad8942f | 341 | HRComp2 = (6000 / HRperiod2); |
Mahir Ozturk |
1:efe9cad8942f | 342 | fingerOff = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 343 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 344 | HRComp2 = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 345 | } |
Mahir Ozturk |
1:efe9cad8942f | 346 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 347 | HRComp2 = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 348 | } |
Mahir Ozturk |
1:efe9cad8942f | 349 | |
Mahir Ozturk |
1:efe9cad8942f | 350 | if (initHrQueCounter < 10 && HRComp2 > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 351 | HrQue[HrQindex] = HRComp2; |
Mahir Ozturk |
1:efe9cad8942f | 352 | HrQindex++; |
Mahir Ozturk |
1:efe9cad8942f | 353 | initHrQueCounter ++; |
Mahir Ozturk |
1:efe9cad8942f | 354 | if (HrQindex == 10) { |
Mahir Ozturk |
1:efe9cad8942f | 355 | HrQindex = 0; |
Mahir Ozturk |
1:efe9cad8942f | 356 | } |
Mahir Ozturk |
1:efe9cad8942f | 357 | } |
Mahir Ozturk |
1:efe9cad8942f | 358 | |
Mahir Ozturk |
1:efe9cad8942f | 359 | if (initHrQueCounter > 7 && lengthOfposCountExceeding <= 3) { |
Mahir Ozturk |
1:efe9cad8942f | 360 | if (HRComp2 > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 361 | |
Mahir Ozturk |
1:efe9cad8942f | 362 | HrCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 363 | HrSum = 0; |
Mahir Ozturk |
1:efe9cad8942f | 364 | zeros_in_HrQue = 0; |
Mahir Ozturk |
1:efe9cad8942f | 365 | for (k = 1 ; k < initHrQueCounter ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 366 | if (HrQue[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 367 | HrSum += HrQue[k]; |
Mahir Ozturk |
1:efe9cad8942f | 368 | HrCount ++; |
Mahir Ozturk |
1:efe9cad8942f | 369 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 370 | zeros_in_HrQue ++; |
Mahir Ozturk |
1:efe9cad8942f | 371 | } |
Mahir Ozturk |
1:efe9cad8942f | 372 | } |
Mahir Ozturk |
1:efe9cad8942f | 373 | meanHrQ = HrSum / HrCount ; |
Mahir Ozturk |
1:efe9cad8942f | 374 | deltaHR = lastKnownGoodHr[0] / 10; |
Mahir Ozturk |
1:efe9cad8942f | 375 | |
Mahir Ozturk |
1:efe9cad8942f | 376 | if (HRComp2 > lastKnownGoodHr[0] - deltaHR && HRComp2 < lastKnownGoodHr[0] + deltaHR) { |
Mahir Ozturk |
1:efe9cad8942f | 377 | for (k = 1 ; k < 10 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 378 | HrQue[10 - k] = HrQue[9 - k]; |
Mahir Ozturk |
1:efe9cad8942f | 379 | } |
Mahir Ozturk |
1:efe9cad8942f | 380 | HrQue[0] = HRComp2; |
Mahir Ozturk |
1:efe9cad8942f | 381 | } /* HR smoothing using FIFO queue */ |
Mahir Ozturk |
1:efe9cad8942f | 382 | |
Mahir Ozturk |
1:efe9cad8942f | 383 | if (zeros_in_HrQue <= 2) { |
Mahir Ozturk |
1:efe9cad8942f | 384 | for (k = 1 ; k < 3 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 385 | HrQueSmoothing[3 - k] = HrQueSmoothing[2 - k]; |
Mahir Ozturk |
1:efe9cad8942f | 386 | } |
Mahir Ozturk |
1:efe9cad8942f | 387 | HrQueSmoothing[0] = meanHrQ ; |
Mahir Ozturk |
1:efe9cad8942f | 388 | HRComp2 = ((HrQueSmoothing[0] << 2) + (HrQueSmoothing[1] << 1) + (HrQueSmoothing[2] << 1)) >> 3; |
Mahir Ozturk |
1:efe9cad8942f | 389 | *HRbpm2 = HRComp2 ; |
Mahir Ozturk |
1:efe9cad8942f | 390 | |
Mahir Ozturk |
1:efe9cad8942f | 391 | for (k = 1 ; k < 10 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 392 | lastKnownGoodHr[10 - k] = lastKnownGoodHr[9 - k]; |
Mahir Ozturk |
1:efe9cad8942f | 393 | } |
Mahir Ozturk |
1:efe9cad8942f | 394 | lastKnownGoodHr[0] = HRComp2; |
Mahir Ozturk |
1:efe9cad8942f | 395 | } |
Mahir Ozturk |
1:efe9cad8942f | 396 | } |
Mahir Ozturk |
1:efe9cad8942f | 397 | |
Mahir Ozturk |
1:efe9cad8942f | 398 | } else if (initHrQueCounter < 7) { /* before que is filled up, display whatever it got. */ |
Mahir Ozturk |
1:efe9cad8942f | 399 | *HRbpm2 = HRComp2; |
Mahir Ozturk |
1:efe9cad8942f | 400 | |
Mahir Ozturk |
1:efe9cad8942f | 401 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 402 | // *HRbpm2 = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 403 | HrCount = 0; |
Mahir Ozturk |
1:efe9cad8942f | 404 | HrSum = 0; |
Mahir Ozturk |
1:efe9cad8942f | 405 | for (k = 0 ; k < 10 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 406 | if (lastKnownGoodHr[k] > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 407 | HrSum = HrSum + lastKnownGoodHr[k]; |
Mahir Ozturk |
1:efe9cad8942f | 408 | HrCount++; |
Mahir Ozturk |
1:efe9cad8942f | 409 | } |
Mahir Ozturk |
1:efe9cad8942f | 410 | } |
Mahir Ozturk |
1:efe9cad8942f | 411 | if (HrCount > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 412 | *HRbpm2 = HrSum / HrCount; |
Mahir Ozturk |
1:efe9cad8942f | 413 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 414 | *HRbpm2 = 0; |
Mahir Ozturk |
1:efe9cad8942f | 415 | } |
Mahir Ozturk |
1:efe9cad8942f | 416 | } |
Mahir Ozturk |
1:efe9cad8942f | 417 | prevPeakLoc = peakLoc ; /* save peakLoc into Static var */ |
Mahir Ozturk |
1:efe9cad8942f | 418 | |
Mahir Ozturk |
1:efe9cad8942f | 419 | if (compSpO2) { |
Mahir Ozturk |
1:efe9cad8942f | 420 | rnum = (ir_avg_reg >> 20) * (*red_ac_mag); |
Mahir Ozturk |
1:efe9cad8942f | 421 | rden = (red_avg_reg >> 20) * (*ir_ac_mag); |
Mahir Ozturk |
1:efe9cad8942f | 422 | rdens = (rden >> 15); |
Mahir Ozturk |
1:efe9cad8942f | 423 | if (rdens > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 424 | cSpO2 = 110 - (((25 * rnum) / (rdens)) >> 15); |
Mahir Ozturk |
1:efe9cad8942f | 425 | } |
Mahir Ozturk |
1:efe9cad8942f | 426 | |
Mahir Ozturk |
1:efe9cad8942f | 427 | if (cSpO2 >= 100) { |
Mahir Ozturk |
1:efe9cad8942f | 428 | SpO2 = 100; |
Mahir Ozturk |
1:efe9cad8942f | 429 | } else if (cSpO2 <= 70) { |
Mahir Ozturk |
1:efe9cad8942f | 430 | SpO2 = 70; |
Mahir Ozturk |
1:efe9cad8942f | 431 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 432 | SpO2 = cSpO2; |
Mahir Ozturk |
1:efe9cad8942f | 433 | } |
Mahir Ozturk |
1:efe9cad8942f | 434 | |
Mahir Ozturk |
1:efe9cad8942f | 435 | SPO2Que[SPO2QueCounter ] = SpO2; |
Mahir Ozturk |
1:efe9cad8942f | 436 | |
Mahir Ozturk |
1:efe9cad8942f | 437 | for (k = 0 ; k < 5 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 438 | SPO2score[k] = 0; |
Mahir Ozturk |
1:efe9cad8942f | 439 | for (j = 0 ; j < 5 ; j++) |
Mahir Ozturk |
1:efe9cad8942f | 440 | if (abs(SPO2Que[k] - SPO2Que[j]) > 5) { |
Mahir Ozturk |
1:efe9cad8942f | 441 | SPO2score[k] ++; |
Mahir Ozturk |
1:efe9cad8942f | 442 | } |
Mahir Ozturk |
1:efe9cad8942f | 443 | } |
Mahir Ozturk |
1:efe9cad8942f | 444 | |
Mahir Ozturk |
1:efe9cad8942f | 445 | SPO2scoreSum = 0; |
Mahir Ozturk |
1:efe9cad8942f | 446 | for (k = 0 ; k < 5 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 447 | SPO2scoreSum += SPO2score[k] ; |
Mahir Ozturk |
1:efe9cad8942f | 448 | } |
Mahir Ozturk |
1:efe9cad8942f | 449 | SPO2scoreAverage = SPO2scoreSum / 5; |
Mahir Ozturk |
1:efe9cad8942f | 450 | for (k = 1 ; k < 5 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 451 | SPO2score[k] = SPO2score[k] - SPO2scoreAverage; |
Mahir Ozturk |
1:efe9cad8942f | 452 | } |
Mahir Ozturk |
1:efe9cad8942f | 453 | |
Mahir Ozturk |
1:efe9cad8942f | 454 | validSPO2Count = 0; |
Mahir Ozturk |
1:efe9cad8942f | 455 | validSPO2Sum = 0; |
Mahir Ozturk |
1:efe9cad8942f | 456 | for (k = 1 ; k < 5 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 457 | if (SPO2score[k] <= 0) { // add for HR to report |
Mahir Ozturk |
1:efe9cad8942f | 458 | validSPO2Sum += SPO2Que[k]; |
Mahir Ozturk |
1:efe9cad8942f | 459 | validSPO2Count ++; |
Mahir Ozturk |
1:efe9cad8942f | 460 | } |
Mahir Ozturk |
1:efe9cad8942f | 461 | } |
Mahir Ozturk |
1:efe9cad8942f | 462 | if (validSPO2Count > 0) { |
Mahir Ozturk |
1:efe9cad8942f | 463 | SPO2D = (validSPO2Sum / validSPO2Count) - 1; |
Mahir Ozturk |
1:efe9cad8942f | 464 | } |
Mahir Ozturk |
1:efe9cad8942f | 465 | if (SPO2D > 100) { |
Mahir Ozturk |
1:efe9cad8942f | 466 | SPO2D = 100; |
Mahir Ozturk |
1:efe9cad8942f | 467 | } |
Mahir Ozturk |
1:efe9cad8942f | 468 | |
Mahir Ozturk |
1:efe9cad8942f | 469 | SPO2QueCounter ++; |
Mahir Ozturk |
1:efe9cad8942f | 470 | if (SPO2QueCounter == 5) { |
Mahir Ozturk |
1:efe9cad8942f | 471 | SPO2QueCounter = 0; |
Mahir Ozturk |
1:efe9cad8942f | 472 | } |
Mahir Ozturk |
1:efe9cad8942f | 473 | |
Mahir Ozturk |
1:efe9cad8942f | 474 | for (k = 1 ; k < 3 ; k++) { |
Mahir Ozturk |
1:efe9cad8942f | 475 | SPO2QueSmoothing[3 - k] = SPO2QueSmoothing[2 - k]; |
Mahir Ozturk |
1:efe9cad8942f | 476 | } |
Mahir Ozturk |
1:efe9cad8942f | 477 | SPO2QueSmoothing[0] = SPO2D; |
Mahir Ozturk |
1:efe9cad8942f | 478 | *SpO2B = ((SPO2QueSmoothing[0] << 2) + (SPO2QueSmoothing[1] << 1) + (SPO2QueSmoothing[2] << 1)) >> 3; |
Mahir Ozturk |
1:efe9cad8942f | 479 | |
Mahir Ozturk |
1:efe9cad8942f | 480 | if (*SpO2B > 100) { |
Mahir Ozturk |
1:efe9cad8942f | 481 | *SpO2B = 100 ; |
Mahir Ozturk |
1:efe9cad8942f | 482 | } |
Mahir Ozturk |
1:efe9cad8942f | 483 | |
Mahir Ozturk |
1:efe9cad8942f | 484 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 485 | SpO2 = 0; |
Mahir Ozturk |
1:efe9cad8942f | 486 | *SpO2B = 0; |
Mahir Ozturk |
1:efe9cad8942f | 487 | } |
Mahir Ozturk |
1:efe9cad8942f | 488 | *DRdy = 1; |
Mahir Ozturk |
1:efe9cad8942f | 489 | |
Mahir Ozturk |
1:efe9cad8942f | 490 | } |
Mahir Ozturk |
1:efe9cad8942f | 491 | } |
Mahir Ozturk |
1:efe9cad8942f | 492 | |
Mahir Ozturk |
1:efe9cad8942f | 493 | /* Detect IR channel negative zero crossing (falling edge) */ |
Mahir Ozturk |
1:efe9cad8942f | 494 | if ((green_ac_sig_pre > 0) && (green_ac_sig_cur <= 0)) { |
Mahir Ozturk |
1:efe9cad8942f | 495 | ir_pedge = 0; |
Mahir Ozturk |
1:efe9cad8942f | 496 | ir_nedge = 1; |
Mahir Ozturk |
1:efe9cad8942f | 497 | ir_ac_sig_min = 0; |
Mahir Ozturk |
1:efe9cad8942f | 498 | ir_nzxic = ns; |
Mahir Ozturk |
1:efe9cad8942f | 499 | } |
Mahir Ozturk |
1:efe9cad8942f | 500 | |
Mahir Ozturk |
1:efe9cad8942f | 501 | /* Find Maximum IR & Red values in positive cycle */ |
Mahir Ozturk |
1:efe9cad8942f | 502 | if (ir_pedge && (green_ac_sig_cur > green_ac_sig_pre)) { |
Mahir Ozturk |
1:efe9cad8942f | 503 | ir_ac_sig_max = ir_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 504 | red_ac_sig_max = red_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 505 | green_ac_sig_max = green_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 506 | } |
Mahir Ozturk |
1:efe9cad8942f | 507 | |
Mahir Ozturk |
1:efe9cad8942f | 508 | /* Find minimum IR & Red values in negative cycle */ |
Mahir Ozturk |
1:efe9cad8942f | 509 | if (ir_nedge && (green_ac_sig_cur < green_ac_sig_pre)) { |
Mahir Ozturk |
1:efe9cad8942f | 510 | ir_ac_sig_min = ir_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 511 | red_ac_sig_min = red_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 512 | green_ac_sig_min = green_ac_sig_cur; |
Mahir Ozturk |
1:efe9cad8942f | 513 | } |
Mahir Ozturk |
1:efe9cad8942f | 514 | |
Mahir Ozturk |
1:efe9cad8942f | 515 | if (IRData < 50000) { |
Mahir Ozturk |
1:efe9cad8942f | 516 | // finger-off |
Mahir Ozturk |
1:efe9cad8942f | 517 | fingerOff++; |
Mahir Ozturk |
1:efe9cad8942f | 518 | *DRdy = 0; |
Mahir Ozturk |
1:efe9cad8942f | 519 | } else { |
Mahir Ozturk |
1:efe9cad8942f | 520 | fingerOff = 0 ; |
Mahir Ozturk |
1:efe9cad8942f | 521 | } |
Mahir Ozturk |
1:efe9cad8942f | 522 | |
Mahir Ozturk |
1:efe9cad8942f | 523 | if (*SpO2B == 0 || *HRbpm2 == 0) { |
Mahir Ozturk |
1:efe9cad8942f | 524 | *DRdy = 0; |
Mahir Ozturk |
1:efe9cad8942f | 525 | } |
Mahir Ozturk |
1:efe9cad8942f | 526 | } |
Mahir Ozturk |
1:efe9cad8942f | 527 | |
Mahir Ozturk |
1:efe9cad8942f | 528 | /* |
Mahir Ozturk |
1:efe9cad8942f | 529 | * Average DC Estimator |
Mahir Ozturk |
1:efe9cad8942f | 530 | */ |
Mahir Ozturk |
1:efe9cad8942f | 531 | uint16_t avg_dc_est(int32_t *p, uint16_t x) |
Mahir Ozturk |
1:efe9cad8942f | 532 | { |
Mahir Ozturk |
1:efe9cad8942f | 533 | *p += ((((int32_t) x << 15) - *p) >> 4); |
Mahir Ozturk |
1:efe9cad8942f | 534 | return (*p >> 15); |
Mahir Ozturk |
1:efe9cad8942f | 535 | } |
Mahir Ozturk |
1:efe9cad8942f | 536 | |
Mahir Ozturk |
1:efe9cad8942f | 537 | /* |
Mahir Ozturk |
1:efe9cad8942f | 538 | * Symmetric Dual Low Pass FIR Filter |
Mahir Ozturk |
1:efe9cad8942f | 539 | */ |
Mahir Ozturk |
1:efe9cad8942f | 540 | void lp_dfir_flt(int16_t din0, int16_t din1, int16_t din2, int16_t *dout0, int16_t *dout1, int16_t *dout2) |
Mahir Ozturk |
1:efe9cad8942f | 541 | { |
Mahir Ozturk |
1:efe9cad8942f | 542 | static const uint16_t FIRCoeffs[12] = {688, 1283, 2316, 3709, 5439, 7431, |
Mahir Ozturk |
1:efe9cad8942f | 543 | 9561, 11666, 13563, 15074, 16047, 16384 |
Mahir Ozturk |
1:efe9cad8942f | 544 | }; |
Mahir Ozturk |
1:efe9cad8942f | 545 | |
Mahir Ozturk |
1:efe9cad8942f | 546 | static int16_t cbuf0[32], cbuf1[32], cbuf2[32]; |
Mahir Ozturk |
1:efe9cad8942f | 547 | static int16_t offset = 0; |
Mahir Ozturk |
1:efe9cad8942f | 548 | int32_t y0, y1, y2; |
Mahir Ozturk |
1:efe9cad8942f | 549 | int16_t i; |
Mahir Ozturk |
1:efe9cad8942f | 550 | |
Mahir Ozturk |
1:efe9cad8942f | 551 | cbuf0[offset] = din0; |
Mahir Ozturk |
1:efe9cad8942f | 552 | cbuf1[offset] = din1; |
Mahir Ozturk |
1:efe9cad8942f | 553 | cbuf2[offset] = din2; |
Mahir Ozturk |
1:efe9cad8942f | 554 | |
Mahir Ozturk |
1:efe9cad8942f | 555 | y0 = mul16(FIRCoeffs[11], cbuf0[(offset - 11) & 0x1F]); |
Mahir Ozturk |
1:efe9cad8942f | 556 | y1 = mul16(FIRCoeffs[11], cbuf1[(offset - 11) & 0x1F]); |
Mahir Ozturk |
1:efe9cad8942f | 557 | y2 = mul16(FIRCoeffs[11], cbuf2[(offset - 11) & 0x1F]); |
Mahir Ozturk |
1:efe9cad8942f | 558 | |
Mahir Ozturk |
1:efe9cad8942f | 559 | |
Mahir Ozturk |
1:efe9cad8942f | 560 | for (i = 0; i < 11; i++) { |
Mahir Ozturk |
1:efe9cad8942f | 561 | y0 += mul16(FIRCoeffs[i], cbuf0[(offset - i) & 0x1F] + cbuf0[(offset - 22 + i) & 0x1F]); |
Mahir Ozturk |
1:efe9cad8942f | 562 | y1 += mul16(FIRCoeffs[i], cbuf1[(offset - i) & 0x1F] + cbuf1[(offset - 22 + i) & 0x1F]); |
Mahir Ozturk |
1:efe9cad8942f | 563 | y2 += mul16(FIRCoeffs[i], cbuf2[(offset - i) & 0x1F] + cbuf2[(offset - 22 + i) & 0x1F]); |
Mahir Ozturk |
1:efe9cad8942f | 564 | } |
Mahir Ozturk |
1:efe9cad8942f | 565 | offset = (offset + 1) & 0x1F; |
Mahir Ozturk |
1:efe9cad8942f | 566 | |
Mahir Ozturk |
1:efe9cad8942f | 567 | *dout0 = (y0 >> 15); |
Mahir Ozturk |
1:efe9cad8942f | 568 | *dout1 = (y1 >> 15); |
Mahir Ozturk |
1:efe9cad8942f | 569 | *dout2 = (y2 >> 15); |
Mahir Ozturk |
1:efe9cad8942f | 570 | } |
Mahir Ozturk |
1:efe9cad8942f | 571 | |
Mahir Ozturk |
1:efe9cad8942f | 572 | /* |
Mahir Ozturk |
1:efe9cad8942f | 573 | * Integer multiplier |
Mahir Ozturk |
1:efe9cad8942f | 574 | */ |
Mahir Ozturk |
1:efe9cad8942f | 575 | int32_t mul16(int16_t x, int16_t y) |
Mahir Ozturk |
1:efe9cad8942f | 576 | { |
Mahir Ozturk |
1:efe9cad8942f | 577 | return (int32_t)(x * y); |
Mahir Ozturk |
1:efe9cad8942f | 578 | } |
Mahir Ozturk |
1:efe9cad8942f | 579 |