From 973976ed8aa986de76bb61a273f0d40b1d658f26 Mon Sep 17 00:00:00 2001
From: GOB <goblin52@gmail.com>
Date: Wed, 15 Apr 2026 15:22:00 +0900
Subject: [PATCH] Add NessoN1 connection note to README

---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index 3520903..acbdb19 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,11 @@ See examples: [NFCA Emulation](examples/UnitUnified/NFCA/Emulation) and [NFCF Em
 
 - I2C version: MIFARE Plus SL3 operation has issues.
 
+### NessoN1 Connection
+GROVE port (port_b) on NessoN1 uses SoftwareI2C (M5HAL Bus), which causes I2C register polling latency too high for ST25R3916 RF timing requirements.  
+Use **QWIIC port (port_a)** with a QWIIC-GROVE conversion cable instead.
+
+> **Note:** GROVE port support may be added in a future update if SoftwareI2C performance improves.
 
 ## Related Link