From fd38f249ce3171d1094d379cc0450c05c20ce3f5 Mon Sep 17 00:00:00 2001
From: TT <edy555@gmail.com>
Date: Mon, 2 Jan 2017 00:00:25 +0900
Subject: [PATCH] continue signal on cw mode

---
 main.c | 8 +++++---
 plot.c | 7 +++++++
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/main.c b/main.c
index ccc6778..94c2b74 100644
--- a/main.c
+++ b/main.c
@@ -101,9 +101,11 @@ static void cmd_reset(BaseSequentialStream *chp, int argc, char *argv[])
 
 int set_frequency(int freq)
 {
-    int delay;
-    delay = si5351_set_frequency_with_offset(freq, frequency_offset, drive_strength);
-    frequency = freq;
+    int delay = 0;
+    if (frequency != freq) {
+      delay = si5351_set_frequency_with_offset(freq, frequency_offset, drive_strength);
+      frequency = freq;
+    }
     return delay;
 }
 
diff --git a/plot.c b/plot.c
index 8a96c6a..2bf6568 100644
--- a/plot.c
+++ b/plot.c
@@ -450,6 +450,8 @@ float linear(float *v)
 float swr(float *v)
 {
   float x = sqrtf(v[0]*v[0] + v[1]*v[1]);
+  if (x > 1)
+    return INFINITY;
   return (1 + x)/(1 - x);
 }
 
@@ -505,6 +507,11 @@ string_value_with_prefix(char *buf, int len, float val, char unit)
 {
   char prefix;
   int n;
+  if (val < 0) {
+    val = -val;
+    *buf++ = '-';
+    len--;
+  }
   if (val < 1e-12) {
     prefix = 'f';
     val *= 1e15;