From 87dd56e7cd821b5e6b07e2e9a867b8f4afad8d22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20NEDJAR?= <sebastien@nedjar.com>
Date: Mon, 16 Mar 2026 09:55:03 +0100
Subject: [PATCH] bq27441: Fix checksum overflow in compute_block_checksum().

---
 lib/bq27441/bq27441/device.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/bq27441/bq27441/device.py b/lib/bq27441/bq27441/device.py
index ab50cac4..4772d958 100644
--- a/lib/bq27441/bq27441/device.py
+++ b/lib/bq27441/bq27441/device.py
@@ -530,7 +530,7 @@ def compute_block_checksum(self):
         for i in range(32):
             csum += data[i]
 
-        csum = 255 - csum
+        csum = (255 - (csum & 0xFF)) & 0xFF
         return csum
 
     # Use the block_data_checksum command to write a checksum value