From cb192d47ede2fd634a4f553e534b9925b85775cc Mon Sep 17 00:00:00 2001
From: "jacob.eva" <x00010@disroot.org>
Date: Thu, 10 Oct 2024 14:47:40 +0100
Subject: [PATCH] Fix incorrect SX1280 preamble calculation

---
 sx128x.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sx128x.cpp b/sx128x.cpp
index f4d55cb..e965a46 100644
--- a/sx128x.cpp
+++ b/sx128x.cpp
@@ -328,12 +328,15 @@ void sx128x::setPacketParams(uint32_t preamble, uint8_t headermode, uint8_t leng
   uint8_t m = 1;
   uint32_t preamblelen;
 
-  for (e <= 15; e++;) {
-      for (m <= 15; m++;) {
-          preamblelen = m * (uint32_t(1) << e);
+  while (e <= 15) {
+      while (m <= 15) {
+          preamblelen = m * (pow(2,e));
           if (preamblelen >= preamble) break;
+          m++;
       }
       if (preamblelen >= preamble) break;
+      m = 0;
+      e++;
   }
 
   buf[0] = (e << 4) | m;