diff --git a/Marlin/src/HAL/HC32/inc/Conditionals_LCD.h b/Marlin/src/HAL/HC32/inc/Conditionals_LCD.h
index 5f1a94e9203a..8266da4b2a49 100644
--- a/Marlin/src/HAL/HC32/inc/Conditionals_LCD.h
+++ b/Marlin/src/HAL/HC32/inc/Conditionals_LCD.h
@@ -20,3 +20,7 @@
*
*/
#pragma once
+
+#if ALL(HAS_MARLINUI_U8GLIB, FORCE_SOFT_SPI)
+ #define U8G_SW_SPI_HC32 1
+#endif
diff --git a/Marlin/src/HAL/HC32/u8g/LCD_defines.h b/Marlin/src/HAL/HC32/u8g/LCD_defines.h
index 8dc94bca7f3f..cb5a6812efd8 100644
--- a/Marlin/src/HAL/HC32/u8g/LCD_defines.h
+++ b/Marlin/src/HAL/HC32/u8g/LCD_defines.h
@@ -24,3 +24,6 @@
/**
* HC32 LCD-specific defines
*/
+
+uint8_t u8g_com_HAL_HC32_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr);
+#define U8G_COM_HAL_SW_SPI_FN u8g_com_HAL_HC32_sw_spi_fn
diff --git a/Marlin/src/HAL/HC32/u8g/u8g_com_HAL_HC32_sw_spi.cpp b/Marlin/src/HAL/HC32/u8g/u8g_com_HAL_HC32_sw_spi.cpp
new file mode 100644
index 000000000000..9f360961942d
--- /dev/null
+++ b/Marlin/src/HAL/HC32/u8g/u8g_com_HAL_HC32_sw_spi.cpp
@@ -0,0 +1,163 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2023 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ *
+ */
+
+#ifdef ARDUINO_ARCH_HC32
+
+#include "../../../inc/MarlinConfig.h"
+
+#if U8G_SW_SPI_HC32
+
+#warning "Software SPI for U8Glib is experimental on HC32F460. Please share your experiences at https://github.com/shadow578/Marlin-H32/issues/35"
+
+#include
+#include "../../shared/HAL_SPI.h"
+
+#ifndef LCD_SPI_SPEED
+ #define LCD_SPI_SPEED SPI_FULL_SPEED // Fastest
+ //#define LCD_SPI_SPEED SPI_QUARTER_SPEED // Slower
+#endif
+
+static uint8_t SPI_speed = LCD_SPI_SPEED;
+
+static inline uint8_t swSpiTransfer_mode_0(uint8_t b, const uint8_t spi_speed, const pin_t miso_pin=-1) {
+ for (i = 0; i < 8; ++i) {
+ if (spi_speed == 0) {
+ WRITE(DOGLCD_MOSI, !!(b & 0x80));
+ WRITE(DOGLCD_SCK, HIGH);
+ b <<= 1;
+ if (miso_pin >= 0 && READ(miso_pin)) b |= 1;
+ WRITE(DOGLCD_SCK, LOW);
+ }
+ else {
+ const uint8_t state = (b & 0x80) ? HIGH : LOW;
+ for (j = 0; j < spi_speed; ++j) WRITE(DOGLCD_MOSI, state);
+ for (j = 0; j < spi_speed + (miso_pin >= 0 ? 0 : 1; ++j)) WRITE(DOGLCD_SCK, HIGH);
+
+ b <<= 1;
+ if (miso_pin >= 0 && READ(miso_pin)) b |= 1;
+
+ for (j = 0; j < spi_speed; ++j) WRITE(DOGLCD_SCK, LOW);
+ }
+ }
+ return b;
+}
+
+static inline uint8_t swSpiTransfer_mode_3(uint8_t b, const uint8_t spi_speed, const pin_t miso_pin=-1) {
+ for (i = 0; i < 8; ++i) {
+ const uint8_t state = (b & 0x80) ? HIGH : LOW;
+ if (spi_speed == 0) {
+ WRITE(DOGLCD_SCK, LOW);
+ WRITE(DOGLCD_MOSI, state);
+ WRITE(DOGLCD_MOSI, state); // need some setup time
+ WRITE(DOGLCD_SCK, HIGH);
+ }
+ else {
+ for (j = 0; j < spi_speed + (miso_pin >= 0 ? 0 : 1); ++j) WRITE(DOGLCD_SCK, LOW);
+ for (j = 0; j < spi_speed; ++j) WRITE(DOGLCD_MOSI, state);
+ for (j = 0; j < spi_speed; ++j) WRITE(DOGLCD_SCK, HIGH);
+ }
+ b <<= 1;
+ if (miso_pin >= 0 && READ(miso_pin)) b |= 1;
+ }
+ return b;
+}
+
+static void u8g_sw_spi_shift_out(uint8_t val) {
+ #if ANY(FYSETC_MINI_12864, MKS_MINI_12864)
+ swSpiTransfer_mode_3(val, SPI_speed);
+ #else
+ swSpiTransfer_mode_0(val, SPI_speed);
+ #endif
+}
+
+static uint8_t swSpiInit(const uint8_t spi_speed) {
+ #if PIN_EXISTS(LCD_RESET)
+ SET_OUTPUT(LCD_RESET_PIN);
+ #endif
+ SET_OUTPUT(DOGLCD_A0);
+ OUT_WRITE(DOGLCD_SCK, LOW);
+ OUT_WRITE(DOGLCD_MOSI, LOW);
+ OUT_WRITE(DOGLCD_CS, HIGH);
+ return spi_speed;
+}
+
+uint8_t u8g_com_HAL_HC32_sw_spi_fn(u8g_t *u8g, uint8_t msg, uint8_t arg_val, void *arg_ptr) {
+ switch (msg) {
+ case U8G_COM_MSG_INIT:
+ SPI_speed = swSpiInit(LCD_SPI_SPEED);
+ break;
+
+ case U8G_COM_MSG_STOP:
+ break;
+
+ case U8G_COM_MSG_RESET:
+ #if PIN_EXISTS(LCD_RESET)
+ WRITE(LCD_RESET_PIN, arg_val);
+ #endif
+ break;
+
+ case U8G_COM_MSG_CHIP_SELECT:
+ #if ANY(FYSETC_MINI_12864, MKS_MINI_12864) // This LCD SPI is running mode 3 while SD card is running mode 0
+ if (arg_val) { // SCK idle state needs to be set to the proper idle state before
+ // the next chip select goes active
+ WRITE(DOGLCD_SCK, HIGH); // Set SCK to mode 3 idle state before CS goes active
+ WRITE(DOGLCD_CS, LOW);
+ }
+ else {
+ WRITE(DOGLCD_CS, HIGH);
+ WRITE(DOGLCD_SCK, LOW); // Set SCK to mode 0 idle state after CS goes inactive
+ }
+ #else
+ WRITE(DOGLCD_CS, !arg_val);
+ #endif
+ break;
+
+ case U8G_COM_MSG_WRITE_BYTE:
+ u8g_sw_spi_shift_out(arg_val);
+ break;
+
+ case U8G_COM_MSG_WRITE_SEQ: {
+ uint8_t *ptr = (uint8_t *)arg_ptr;
+ while (arg_val > 0) {
+ u8g_sw_spi_shift_out(*ptr++);
+ arg_val--;
+ }
+ } break;
+
+ case U8G_COM_MSG_WRITE_SEQ_P: {
+ uint8_t *ptr = (uint8_t *)arg_ptr;
+ while (arg_val > 0) {
+ u8g_sw_spi_shift_out(u8g_pgm_read(ptr));
+ ptr++;
+ arg_val--;
+ }
+ } break;
+
+ case U8G_COM_MSG_ADDRESS: /* define cmd (arg_val = 0) or data mode (arg_val = 1) */
+ WRITE(DOGLCD_A0, arg_val);
+ break;
+ }
+ return 1;
+}
+
+#endif // U8G_SW_SPI_HC32
+#endif // ARDUINO_ARCH_HC32
diff --git a/Marlin/src/pins/hc32f4/pins_AQUILA_101.h b/Marlin/src/pins/hc32f4/pins_AQUILA_101.h
index 32268f4cf84e..2834d56c96e9 100644
--- a/Marlin/src/pins/hc32f4/pins_AQUILA_101.h
+++ b/Marlin/src/pins/hc32f4/pins_AQUILA_101.h
@@ -153,22 +153,21 @@
#define EXP1_08_PIN PB15 // EN1
#if ENABLED(CR10_STOCKDISPLAY) // LCD used for C2
-#undef LCD_SERIAL_PORT
-#define LCD_SERIAL_PORT 1
- #define LCD_PINS_RS EXP1_07_PIN
- #define LCD_PINS_EN EXP1_08_PIN
- #define LCD_PINS_D4 EXP1_06_PIN
+ #ifndef HAS_PIN_27_BOARD
+ #define BEEPER_PIN EXP1_01_PIN
+ #endif
#define BTN_ENC EXP1_02_PIN
#define BTN_EN1 EXP1_03_PIN
#define BTN_EN2 EXP1_05_PIN
- #ifndef HAS_PIN_27_BOARD
- #define BEEPER_PIN EXP1_01_PIN
- #endif
+ #define LCD_PINS_RS EXP1_07_PIN
+ #define LCD_PINS_EN EXP1_08_PIN
+ #define LCD_PINS_D4 EXP1_06_PIN
#elif ANY(HAS_DWIN_E3V2, IS_DWIN_MARLINUI) // LCD used for X2
+
/**
* Display pinout (display side, so RX/TX are swapped)
*