From: c vw <dl1ycf@darc.de>
Date: Thu, 9 Jan 2020 18:39:01 +0000 (+0100)
Subject: making AutoAttenuation a little bit more precise
X-Git-Url: https://git.rkrishnan.org/Site/%5B/%5D%20/uri/%3C?a=commitdiff_plain;h=5e9b0a49da8a45600a056712044732ffa0120d7a;p=pihpsdr.git

making AutoAttenuation a little bit more precise
---

diff --git a/ps_menu.c b/ps_menu.c
index e1a4561..a303497 100644
--- a/ps_menu.c
+++ b/ps_menu.c
@@ -219,14 +219,21 @@ static int info_thread(gpointer arg) {
       old5_2=info[5];
       switch(state) {
         case 0:
-          if(newcal && (info[4]>181 || (info[4]<=128 && transmitter->attenuation>0))) {
-	    if (info[4] > 0) {
+	  //
+	  // A value of 175 means 1.2 dB too strong
+	  // A value of 132 means 1.2 dB too weak
+	  //
+          if(newcal && ((info[4]>175 && transmitter->attenuation < 31) || (info[4]<=132 && transmitter->attenuation>0))) {
+            if (info[4] > 256) {
+	      // If signal is very strong, start with large attenuation and then step up
+	      ddb = 100.0;  // this makes the attenuation 31 dB in the next step
+            } else if (info[4] > 0) {
               ddb= 20.0 * log10((double)info[4]/152.293);
 	    } else {
 	      // This happens when the "Drive" slider is moved to zero
-	      ddb= -100.0;
+	      ddb= -100.0;  // this makes the attenuation zero in the next step
 	    }
-            new_att=transmitter->attenuation + (int)ddb;
+            new_att=transmitter->attenuation + (int)lround(ddb);
 	    // keep new value of attenuation in allowed range
 	    if (new_att <  0) new_att= 0;
 	    if (new_att > 31) new_att=31;