From 5090f5a18d0c6a0494fe92268112613fef9be0e0 Mon Sep 17 00:00:00 2001
From: Andreas Eversberg <jolly@eversberg.eu>
Date: Sun, 30 Jul 2017 22:03:51 +0200
Subject: SDR: Show IQ data with three colors to detect input overdrive

green: up to 0.45
yellow: between 0.45 and 0.9
red: above 0.9
---
 src/common/display_iq.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/common/display_iq.c b/src/common/display_iq.c
index 6a27485..9df3725 100644
--- a/src/common/display_iq.c
+++ b/src/common/display_iq.c
@@ -181,7 +181,13 @@ void display_iq(float *samples, int length)
 					screen[y/2][x] = '\'';
 				else
 					screen[y/2][x] = '.';
-				if (L > 1.0)
+				/* overdrive:
+				 * 2 = close to -1..1 or above
+				 * 1 = close to -0.5..0.5 or above
+				 */
+				if (L > 0.9)
+					overdrive[y/2][x] = 2;
+				else if (L > 0.45 && overdrive[y/2][x] < 1)
 					overdrive[y/2][x] = 1;
 			}
 			if (iq_on == 1)
@@ -214,13 +220,24 @@ void display_iq(float *samples, int length)
 								putchar('|');
 						}
 					} else if (screen[j][k] == ':' || screen[j][k] == '.' || screen[j][k] == '\'') {
-						/* red / green plot */
-						if (overdrive[j][k]) {
+						/* red / yellow / green plot */
+						switch (overdrive[j][k]) {
+						case 2:
+							/* red  */
 							if (color != 1) {
 								color = 1;
 								printf("\033[1;31m");
 							}
-						} else {
+							break;
+						case 1:
+							/* yellow */
+							if (color != 3) {
+								color = 3;
+								printf("\033[1;33m");
+							}
+							break;
+						default:
+							/* green */
 							if (color != 2) {
 								color = 2;
 								printf("\033[1;32m");
-- 
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