97 lines
2.1 KiB
C++
97 lines
2.1 KiB
C++
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#include <vector>
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#include <nrf_log.h>
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#include "Ppg.h"
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using namespace Pinetime::Controllers;
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namespace {
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// TODO no vector!
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int Compare(int* d1, int* d2, size_t count) {
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int e = 0;
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for(int i = 0; i < count; i++) {
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auto d = d1[i] - d2[i];
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e += d * d;
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}
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return e;
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}
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int CompareShift(int* d, int shift, size_t count) {
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return Compare(d +shift, d, count - shift);
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}
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int Trough(int* d, size_t size, float mn, float mx) {
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auto z2 = CompareShift(d, mn-2, size);
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auto z1 = CompareShift(d, mn-1, size);
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for(int i = mn; i < mx + 1; i++) {
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auto z = CompareShift(d, i, size);
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if(z2 > z1 && z1 < z)
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return i;
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z2 = z1;
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z1 = z;
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}
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return -1;
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}
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}
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Ppg::Ppg(float spl) : offset{spl},
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hpf{0.87033078, -1.74066156, 0.87033078,-1.72377617, 0.75754694},
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agc{20, 0.971, 2},
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lpf{0.11595249, 0.23190498, 0.11595249,-0.72168143, 0.18549138} {
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}
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int Ppg::Preprocess(float spl) {
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spl -= offset;
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spl = hpf.Step(spl);
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spl = agc.Step(spl);
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spl = lpf.Step(spl);
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auto spl_int = static_cast<int>(spl);
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if(dataIndex < 200)
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data[dataIndex++] = spl_int;
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return spl_int;
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}
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float Ppg::HeartRate() {
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if(dataIndex < 200)
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return 0;
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NRF_LOG_INFO("PREPROCESS, offset = %d", offset);
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auto hr = ProcessHeartRate();
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dataIndex = 0;
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return hr;
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}
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int cccount = 0;
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float Ppg::ProcessHeartRate() {
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if(cccount > 2)
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asm("nop");
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cccount ++;
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auto t0 = Trough(data.data(), dataIndex, 7, 48);
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if(t0 < 0)
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return 0;
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float t1 = t0 * 2;
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t1 = Trough(data.data(), dataIndex, t1-5, t1+5);
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if(t1 < 0)
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return 0;
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float t2 = static_cast<int>(t1 * 3) / 2;
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t2 = Trough(data.data(), dataIndex, t2 - 5, t2 + 5);
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if(t2 < 0)
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return 0;
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float t3 = static_cast<int>(t2 * 4) / 3;
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t3 = Trough(data.data(), dataIndex, t3 - 4, t3 + 4);
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if(t3 < 0)
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return static_cast<int>(60 * 24 * 3) / static_cast<int>(t2);
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return static_cast<int>(60 * 24 * 4) / static_cast<int>(t3);
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}
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void Ppg::SetOffset(uint16_t offset) {
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this->offset = offset;
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dataIndex = 0;
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}
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