From 0db99b9c7c8f0304b395f8f9fdc32c1a356b16b7 Mon Sep 17 00:00:00 2001
From: TT <edy555@gmail.com>
Date: Thu, 2 Feb 2017 05:49:49 +0900
Subject: [PATCH] add lower range 50kHz support, fix frequency inversion

---
 main.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/main.c b/main.c
index 8555e8b..7c2d352 100644
--- a/main.c
+++ b/main.c
@@ -534,7 +534,7 @@ freq_mode_centerspan(void)
 }
 
 
-#define START_MIN 500000
+#define START_MIN 50000
 #define STOP_MAX 300000000
 
 void
@@ -549,6 +549,9 @@ set_sweep_frequency(int type, float frequency)
     if (frequency0 != freq) {
       ensure_edit_config();
       frequency0 = freq;
+      // if start > stop then make start = stop
+      if (frequency1 < freq)
+        frequency1 = freq;
       update_frequencies();
     }
     break;
@@ -559,6 +562,9 @@ set_sweep_frequency(int type, float frequency)
     if (frequency1 != freq) {
       ensure_edit_config();
       frequency1 = freq;
+      // if start > stop then make start = stop
+      if (frequency0 > freq)
+        frequency0 = freq;
       update_frequencies();
     }
     break;