From 0baaec639d3229410e1a26abb3a9cb6df6099a0d Mon Sep 17 00:00:00 2001
From: RussellAult <RussellAult@users.noreply.github.com>
Date: Sat, 22 Jun 2024 16:03:08 -0600
Subject: [PATCH] reduced maximum waterfall_palette y value by 1

- otherwise maximum value of y will trigger the subsequent break
- fixes erikkaashoek/tinySA#102
---
 plot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plot.c b/plot.c
index 10a5b06..e6f015d 100644
--- a/plot.c
+++ b/plot.c
@@ -2151,7 +2151,7 @@ static void update_waterfall(void){
   for (i=0; i< sweep_points; i++) {			// Add new topline
     uint16_t color;
 #ifdef _USE_WATERFALL_PALETTE
-    uint16_t y = _PALETTE_ALIGN(256 - graph_bottom + index[i]); // should be always in range 0 - graph_bottom
+    uint16_t y = _PALETTE_ALIGN(255 - graph_bottom + index[i]); // should be always in range 0 - graph_bottom
 //    y = (uint8_t)i;  // for test
     if (y > 255)            // at start the index_y_t table could be empty leading to negative y
       break;