From 99e579fe00cacce2279c299edc39a41ce7c728af Mon Sep 17 00:00:00 2001
From: erikkaashoek <erik@kaashoek.com>
Date: Wed, 20 Jan 2021 08:34:45 +0100
Subject: [PATCH] Linearity test added back in

---
 nanovna.h | 2 +-
 ui_sa.c   | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/nanovna.h b/nanovna.h
index be5f0ee..d634b4a 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -42,7 +42,7 @@
 #define __SCROLL__
 #define __ICONS__
 #define __MEASURE__
-//#define __LINEARITY__         // Not available
+#define __LINEARITY__         // Not available
 #define __SELFTEST__
 #define __CALIBRATE__
 #define __FAST_SWEEP__          // Pre-fill SI4432 RSSI buffer  to get fastest sweep in zero span mode
diff --git a/ui_sa.c b/ui_sa.c
index bc4b72c..cd5ddc5 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -1785,10 +1785,12 @@ static const menuitem_t menu_settings[] =
 };
 
 static const menuitem_t menu_measure2[] = {
-//  { MT_ADV_CALLBACK | MT_LOW,   M_LINEARITY,  "LINEAR",         menu_measure_acb},
   { MT_ADV_CALLBACK,            M_AM,           "AM",           menu_measure_acb},
   { MT_ADV_CALLBACK,            M_FM,           "FM",           menu_measure_acb},
   { MT_ADV_CALLBACK,            M_THD,          "THD",           menu_measure_acb},
+#ifdef __LINEARITY__
+  { MT_ADV_CALLBACK | MT_LOW,   M_LINEARITY,  "LINEAR",         menu_measure_acb},
+#endif
   { MT_CANCEL, 0,               S_LARROW" BACK", NULL },
   { MT_NONE,   0, NULL, NULL } // sentinel
 };