From c22e30a4a6ef014c7a5086ad47eaab7740a75ff2 Mon Sep 17 00:00:00 2001
From: Ceimour <113631258+Ceimour@users.noreply.github.com>
Date: Sun, 30 Apr 2023 08:50:18 -0500
Subject: Refactored Ppg for frequency based algorithm. (#1486)

New implementation of the heart rate sensor data processing using a frequency based PPG algorithm.
The HRS3300 settings are fine-tuned for better signal to noise at 10Hz.
The measurement delay is now set to 100ms.
Enable and use the ambient light sensor.
FFT implementation based on ArduinoFFT (https://github.com/kosme/arduinoFFT, GPLv3.0).
---
 src/components/heartrate/Biquad.cpp | 26 --------------------------
 1 file changed, 26 deletions(-)
 delete mode 100644 src/components/heartrate/Biquad.cpp

(limited to 'src/components/heartrate/Biquad.cpp')

diff --git a/src/components/heartrate/Biquad.cpp b/src/components/heartrate/Biquad.cpp
deleted file mode 100644
index b7edd403..00000000
--- a/src/components/heartrate/Biquad.cpp
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
-  SPDX-License-Identifier: LGPL-3.0-or-later
-  Original work Copyright (C) 2020 Daniel Thompson
-  C++ port Copyright (C) 2021 Jean-François Milants
-*/
-
-#include "components/heartrate/Biquad.h"
-
-using namespace Pinetime::Controllers;
-
-/** Original implementation from wasp-os : https://github.com/daniel-thompson/wasp-os/blob/master/wasp/ppg.py */
-Biquad::Biquad(float b0, float b1, float b2, float a1, float a2) : b0 {b0}, b1 {b1}, b2 {b2}, a1 {a1}, a2 {a2} {
-}
-
-float Biquad::Step(float x) {
-  auto v1 = this->v1;
-  auto v2 = this->v2;
-
-  auto v = x - (a1 * v1) - (a2 * v2);
-  auto y = (b0 * v) + (b1 * v1) + (b2 * v2);
-
-  this->v2 = v1;
-  this->v1 = v;
-
-  return y;
-}
-- 
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