From 9c4e5d259a2af7859c780c6ab97766e92f416f48 Mon Sep 17 00:00:00 2001
From: Waldemar Porscha <wp@porscha.eu>
Date: Tue, 22 Aug 2023 11:28:10 +0200
Subject: [PATCH] FIX: float16ToPayload

- all DPT9 numbers of the form (2^n)/100, n>10 (first value is 20.48) were converted to a payload of 0
- in other words: 20.48; 40.96; 81.92; etc. were send as 0!
---
 src/knx/dptconvert.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/knx/dptconvert.cpp b/src/knx/dptconvert.cpp
index e8b48b7..fc6a932 100644
--- a/src/knx/dptconvert.cpp
+++ b/src/knx/dptconvert.cpp
@@ -1749,8 +1749,8 @@ void float16ToPayload(uint8_t* payload, size_t payload_length, int index, double
     value *= 100.0;
     unsigned short exponent = 0;
   
-    if(value > 2048)
-        exponent = ceil(log2(value) - 11.0);
+    if(value >= 2048)
+        exponent = ceil(log2(value + 1.0) - 11.0);
     
     short mantissa = roundf(value / (1 << exponent));