From 2d0052fb14c741aac3a6ac687b48dff0ef95de64 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Mon, 7 Dec 2015 09:58:08 -0800
Subject: [PATCH] Generalize ERT offset tracking a little.

---
 firmware/baseband/proc_ert.cpp | 6 +++---
 firmware/baseband/proc_ert.hpp | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/firmware/baseband/proc_ert.cpp b/firmware/baseband/proc_ert.cpp
index 97fd63073..b9daa9527 100644
--- a/firmware/baseband/proc_ert.cpp
+++ b/firmware/baseband/proc_ert.cpp
@@ -51,9 +51,9 @@ void ERTProcessor::execute(buffer_c8_t buffer) {
 	average_i += src->real();
 	average_q += src->imag();
 	average_count++;
-	if( average_count == 2048 ) {
-		offset_i = static_cast<float>(average_i) / 2048.0f;
-		offset_q = static_cast<float>(average_q) / 2048.0f;
+	if( average_count == average_window ) {
+		offset_i = static_cast<float>(average_i) / average_window;
+		offset_q = static_cast<float>(average_q) / average_window;
 		average_i = 0;
 		average_q = 0;
 		average_count = 0;
diff --git a/firmware/baseband/proc_ert.hpp b/firmware/baseband/proc_ert.hpp
index fa38d286a..0bb3d0c3c 100644
--- a/firmware/baseband/proc_ert.hpp
+++ b/firmware/baseband/proc_ert.hpp
@@ -96,6 +96,7 @@ private:
 	float sum_period[3];
 	float manchester[3];
 
+	const size_t average_window { 2048 };
 	int32_t average_i { 0 };
 	int32_t average_q { 0 };
 	size_t average_count { 0 };