From f49973528068ebfa8d43a96538b76e3dc430186c Mon Sep 17 00:00:00 2001
From: ellensp <530024+ellensp@users.noreply.github.com>
Date: Sat, 14 Jun 2025 15:27:05 +1200
Subject: [PATCH] =?UTF-8?q?=F0=9F=A9=B9=20Fix=20Ender-3=20S1=20pin=20EXP3-?=
 =?UTF-8?q?4=20(#27915)?=
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---
 .../pins/stm32f4/pins_CREALITY_V24S1_301F4.h  | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/Marlin/src/pins/stm32f4/pins_CREALITY_V24S1_301F4.h b/Marlin/src/pins/stm32f4/pins_CREALITY_V24S1_301F4.h
index 40ea8ae9bc..5a42b1c72a 100644
--- a/Marlin/src/pins/stm32f4/pins_CREALITY_V24S1_301F4.h
+++ b/Marlin/src/pins/stm32f4/pins_CREALITY_V24S1_301F4.h
@@ -37,6 +37,34 @@
 
 #define EEPROM_EXCL_ZONE 916,926  // Ender-3S1 STM32F401 Bootloader EEPROM exclusion zone
 
+  /**
+   *                 ------
+   *           PC6  | 1  2 | PB2
+   *  UART2_TX PA2  | 3  4 | PA3 UART2_RX
+   *           PB14   5  6 | PB13
+   *           PB12 | 7  8 | PB15
+   *            GND | 9 10 | 5V
+   *                 ------
+   *                  EXP3
+   */
+
 #define EXP3_03_PIN                         PA2
+#define EXP3_04_PIN                         PA3
+
+  /**
+   *          ----
+   *     VCC | 1  |
+   *     VCC | 2  |
+   *     GND | 3  |
+   *    PA14 | 4  |
+   *    PA13 | 5  |
+   *     PB1 | 6  |
+   *     PB2 | 7  |
+   *     PA2 | 8  | UART2_TX
+   *     PA3 | 9  | UART2_RX
+   *     GND | 10 |
+   *          ----
+   *   Touch screen Interface
+   */
 
 #include "../stm32f1/pins_CREALITY_V24S1_301.h"