From 3a3a14115a81b9dd2c6f839c0ad1b14d04367642 Mon Sep 17 00:00:00 2001
From: Jean-François Milants <jf@codingfield.com>
Date: Sun, 17 Jan 2021 16:33:45 +0100
Subject: Add License/copyright info in HR related files.

---
 src/components/heartrate/Biquad.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

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

diff --git a/src/components/heartrate/Biquad.cpp b/src/components/heartrate/Biquad.cpp
index 37b3ba67..6a4b8181 100644
--- a/src/components/heartrate/Biquad.cpp
+++ b/src/components/heartrate/Biquad.cpp
@@ -1,7 +1,14 @@
+/*
+  SPDX-License-Identifier: LGPL-3.0-or-later
+  Original work Copyright (C) 2020 Daniel Thompson
+  C++ port Copyright (C) 2021 Jean-François Milants
+*/
+
 #include "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} {
 
 }
-- 
cgit v1.2.3-70-g09d2