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update EXP3_04_PIN for CREALITY_V24S1_301F4 #27915

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ellensp
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@ellensp ellensp commented Jun 12, 2025

Description

It was discovered yet another pin is wrong on the CREALITY_V24S1_301F4 Lcd port

Currently EXP3_04_PIN is defined as PB11 in the included pins_CREALITY_V4.h
But the STM32F401RC in a LQFP64 package does not have PB11

After some work by meganukebmp (Nexrem on discord), it was tracked down to really be PA3

This also makes sense as this puts UART 2 on the standard LCD pins creality uses for it 2*5 pin serial screens.

Also added the 1*10 "Touch screen Interface" pin diagram.

Requirements

CREALITY_V24S1_301F4

Benefits

Correct pins on 2*5 LCD port

Related

  • [BUG] CREALITY_V24S1_301F4 EXT3 pin 4 wrong mapping #27914
  • [FR] Support for Creality board v24S1 v301 for Ender 3 S1 Configurations#645
  • @ellensp
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    ellensp commented Jun 12, 2025

    a reddit post https://www.reddit.com/r/Ender3S1/comments/12ftfx6/ender_s1_pro_successful_uart_mod_for_xyze/ has cast doubt that

    pin 5 currently PA12 should be PA13

    So hold until this is confirmed one way or the other

    also #define IIC_EEPROM_SCL PA12
    So im inclined to believe pin 5 should be PA13

    @thinkyhead
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    It all makes sense.

    @thinkyhead thinkyhead merged commit f499735 into MarlinFirmware:bugfix-2.1.x Jun 14, 2025
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    @ellensp ellensp deleted the update-pins_CREALITY_V24S1_301F4 branch June 14, 2025 03:31
    @meganukebmp
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    Just chiming in, I have re-verified the pinout, please see attached picture.
    image

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    [BUG] CREALITY_V24S1_301F4 EXT3 pin 4 wrong mapping
    3 participants