From 05382584f4de463b9e7da1865f21ce624b604e21 Mon Sep 17 00:00:00 2001
From: Dual Tachyon <N/A>
Date: Mon, 28 Aug 2023 20:13:33 +0100
Subject: [PATCH] More restructuring of functions and variables.

---
 Makefile                      |   8 +-
 app/app.c                     |  10 +-
 app/generic.c                 |   3 +-
 app/main.c                    |   2 +-
 app/menu.c                    |   2 +-
 audio.c                       |   2 +-
 board.c                       |   2 +-
 driver/keyboard.c             |   5 +
 driver/keyboard.h             |   8 +
 functions.c                   |   7 +-
 gui.c                         | 306 ----------------------------------
 helper.c                      |   8 +-
 helper.h                      |   4 -
 battery.c => helper/battery.c |   5 +-
 battery.h => helper/battery.h |   0
 main.c                        |   9 +-
 misc.c                        |   4 +-
 misc.h                        |   4 +-
 radio.c                       |   2 +-
 scheduler.c                   |   3 +-
 ui/battery.c                  |  53 ++++++
 ui/battery.h                  |  26 +++
 ui/fmradio.c                  |   2 +-
 ui/lock.c                     | 122 ++++++++++++++
 ui/lock.h                     |  23 +++
 ui/menu.c                     |  14 +-
 ui/rssi.c                     |   2 +-
 ui/scanner.c                  |   1 -
 ui/status.c                   |  81 +++++++++
 ui/status.h                   |  23 +++
 ui/ui.c                       |  82 +++++++++
 gui.h => ui/ui.h              |   9 -
 ui/welcome.c                  |  52 ++++++
 ui/welcome.h                  |  23 +++
 34 files changed, 542 insertions(+), 365 deletions(-)
 delete mode 100644 gui.c
 rename battery.c => helper/battery.c (96%)
 rename battery.h => helper/battery.h (100%)
 create mode 100644 ui/battery.c
 create mode 100644 ui/battery.h
 create mode 100644 ui/lock.c
 create mode 100644 ui/lock.h
 create mode 100644 ui/status.c
 create mode 100644 ui/status.h
 create mode 100644 ui/ui.c
 rename gui.h => ui/ui.h (82%)
 create mode 100644 ui/welcome.c
 create mode 100644 ui/welcome.h

diff --git a/Makefile b/Makefile
index 8f680ff..a8de88e 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,6 @@ OBJS += app/generic.o
 OBJS += app/main.o
 OBJS += app/menu.o
 OBJS += audio.o
-OBJS += battery.o
 OBJS += bitmaps.o
 OBJS += board.o
 OBJS += dcs.o
@@ -49,20 +48,25 @@ OBJS += fm.o
 OBJS += font.o
 OBJS += frequencies.o
 OBJS += functions.o
-OBJS += gui.o
 OBJS += helper.o
+OBJS += helper/battery.o
 OBJS += misc.o
 OBJS += radio.o
 OBJS += scheduler.o
 OBJS += settings.o
 OBJS += ui/aircopy.o
+OBJS += ui/battery.o
 OBJS += ui/fmradio.o
 OBJS += ui/helper.o
 OBJS += ui/inputbox.o
+OBJS += ui/lock.o
 OBJS += ui/main.o
 OBJS += ui/menu.o
 OBJS += ui/rssi.o
 OBJS += ui/scanner.o
+OBJS += ui/status.o
+OBJS += ui/ui.o
+OBJS += ui/welcome.o
 
 OBJS += main.o
 
diff --git a/app/app.c b/app/app.c
index 87242e9..5b34b54 100644
--- a/app/app.c
+++ b/app/app.c
@@ -21,7 +21,6 @@
 #include "app/main.h"
 #include "app/menu.h"
 #include "audio.h"
-#include "battery.h"
 #include "board.h"
 #include "bsp/dp32g030/gpio.h"
 #include "driver/backlight.h"
@@ -36,15 +35,18 @@
 #include "fm.h"
 #include "frequencies.h"
 #include "functions.h"
-#include "gui.h"
 #include "helper.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "radio.h"
 #include "settings.h"
 #include "sram-overlay.h"
+#include "ui/battery.h"
 #include "ui/inputbox.h"
 #include "ui/menu.h"
 #include "ui/rssi.h"
+#include "ui/status.h"
+#include "ui/ui.h"
 
 static void APP_ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld);
 void FUN_000069f8(FUNCTION_Type_t Function);
@@ -1047,7 +1049,7 @@ void APP_TimeSlice10ms(void)
 
 	if (gCurrentFunction != FUNCTION_TRANSMIT) {
 		if (g_2000036F == 1) {
-			GUI_DisplayStatusLine();
+			UI_DisplayStatus();
 			g_2000036F = 0;
 		}
 		if (gUpdateDisplay) {
@@ -1291,7 +1293,7 @@ LAB_00004b08:
 
 	if (gLowBattery) {
 		gLowBatteryBlink = ++g_20000400 & 1;
-		GUI_DisplayBatteryLevel(g_20000400);
+		UI_DisplayBattery(g_20000400);
 		if (gCurrentFunction != FUNCTION_TRANSMIT) {
 			if (g_20000400 < 30) {
 				if (g_20000400 == 29 && gChargingWithTypeC == false) {
diff --git a/app/generic.c b/app/generic.c
index 0b0a0b2..43c9e42 100644
--- a/app/generic.c
+++ b/app/generic.c
@@ -1,13 +1,14 @@
 #include "app/generic.h"
 #include "audio.h"
+#include "driver/keyboard.h"
 #include "dtmf.h"
 #include "external/printf/printf.h"
 #include "fm.h"
 #include "functions.h"
-#include "gui.h"
 #include "misc.h"
 #include "settings.h"
 #include "ui/inputbox.h"
+#include "ui/ui.h"
 
 extern void FUN_0000773c(void);
 extern void PlayFMRadio(void);
diff --git a/app/main.c b/app/main.c
index 3fe98d6..ac723a9 100644
--- a/app/main.c
+++ b/app/main.c
@@ -4,11 +4,11 @@
 #include "dtmf.h"
 #include "fm.h"
 #include "frequencies.h"
-#include "gui.h"
 #include "misc.h"
 #include "radio.h"
 #include "settings.h"
 #include "ui/inputbox.h"
+#include "ui/ui.h"
 
 extern void APP_SwitchToFM(void);
 extern void FUN_0000773c(void);
diff --git a/app/menu.c b/app/menu.c
index 03fc8be..2e2a2e9 100644
--- a/app/menu.c
+++ b/app/menu.c
@@ -7,12 +7,12 @@
 #include "driver/gpio.h"
 #include "driver/keyboard.h"
 #include "frequencies.h"
-#include "gui.h"
 #include "misc.h"
 #include "settings.h"
 #include "sram-overlay.h"
 #include "ui/inputbox.h"
 #include "ui/menu.h"
+#include "ui/ui.h"
 
 static const VOICE_ID_t MenuVoices[] = {
 	VOICE_ID_SQUELCH,
diff --git a/audio.c b/audio.c
index 8a37263..b7ddfed 100644
--- a/audio.c
+++ b/audio.c
@@ -23,9 +23,9 @@
 #include "driver/systick.h"
 #include "fm.h"
 #include "functions.h"
-#include "gui.h"
 #include "misc.h"
 #include "settings.h"
+#include "ui/ui.h"
 
 static const uint8_t VoiceClipLengthChinese[58] = {
 	0x32, 0x32, 0x32, 0x37, 0x37, 0x32, 0x32, 0x32,
diff --git a/board.c b/board.c
index 4b56dc4..a4d7e7a 100644
--- a/board.c
+++ b/board.c
@@ -16,7 +16,6 @@
  */
 
 #include <string.h>
-#include "battery.h"
 #include "board.h"
 #include "bsp/dp32g030/gpio.h"
 #include "bsp/dp32g030/portcon.h"
@@ -34,6 +33,7 @@
 #include "dtmf.h"
 #include "fm.h"
 #include "frequencies.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "settings.h"
 #include "sram-overlay.h"
diff --git a/driver/keyboard.c b/driver/keyboard.c
index 0aa736e..f90c37e 100644
--- a/driver/keyboard.c
+++ b/driver/keyboard.c
@@ -20,6 +20,11 @@
 #include "driver/keyboard.h"
 #include "driver/systick.h"
 
+KEY_Code_t gKeyReading0;
+KEY_Code_t gKeyReading1;
+uint8_t gDebounceCounter;
+bool gWasFKeyPressed;
+
 KEY_Code_t KEYBOARD_Poll(void)
 {
 	KEY_Code_t Key = KEY_INVALID;
diff --git a/driver/keyboard.h b/driver/keyboard.h
index 3c40505..58a7da3 100644
--- a/driver/keyboard.h
+++ b/driver/keyboard.h
@@ -18,6 +18,9 @@
 #ifndef DRIVER_KEYBOARD_H
 #define DRIVER_KEYBOARD_H
 
+#include <stdbool.h>
+#include <stdint.h>
+
 enum KEY_Code_t {
 	KEY_0 = 0,
 	KEY_1 = 1,
@@ -43,6 +46,11 @@ enum KEY_Code_t {
 
 typedef enum KEY_Code_t KEY_Code_t;
 
+extern KEY_Code_t gKeyReading0;
+extern KEY_Code_t gKeyReading1;
+extern uint8_t gDebounceCounter;
+extern bool gWasFKeyPressed;
+
 KEY_Code_t KEYBOARD_Poll(void);
 
 #endif
diff --git a/functions.c b/functions.c
index 6deacc7..9e28446 100644
--- a/functions.c
+++ b/functions.c
@@ -15,7 +15,6 @@
  */
 
 #include <string.h>
-#include "battery.h"
 #include "bsp/dp32g030/gpio.h"
 #include "dcs.h"
 #include "driver/bk1080.h"
@@ -26,10 +25,12 @@
 #include "external/printf/printf.h"
 #include "fm.h"
 #include "functions.h"
-#include "gui.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "radio.h"
 #include "settings.h"
+#include "ui/status.h"
+#include "ui/ui.h"
 
 FUNCTION_Type_t gCurrentFunction;
 
@@ -81,7 +82,7 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 		if (Function != FUNCTION_POWER_SAVE) {
 			BK4819_Conditional_RX_TurnOn_and_GPIO6_Enable();
 			gThisCanEnable_BK4819_Rxon = false;
-			GUI_DisplayStatusLine();
+			UI_DisplayStatus();
 		}
 	}
 
diff --git a/gui.c b/gui.c
deleted file mode 100644
index 7e07d34..0000000
--- a/gui.c
+++ /dev/null
@@ -1,306 +0,0 @@
-/* Copyright 2023 Dual Tachyon
- * https://github.com/DualTachyon
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- *     Unless required by applicable law or agreed to in writing, software
- *     distributed under the License is distributed on an "AS IS" BASIS,
- *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *     See the License for the specific language governing permissions and
- *     limitations under the License.
- */
-
-#include <string.h>
-#include "audio.h"
-#include "battery.h"
-#include "bitmaps.h"
-#include "driver/eeprom.h"
-#include "driver/keyboard.h"
-#include "driver/st7565.h"
-#include "external/printf/printf.h"
-#include "fm.h"
-#include "functions.h"
-#include "gui.h"
-#include "helper.h"
-#include "misc.h"
-#include "settings.h"
-#include "ui/aircopy.h"
-#include "ui/fmradio.h"
-#include "ui/helper.h"
-#include "ui/inputbox.h"
-#include "ui/main.h"
-#include "ui/menu.h"
-#include "ui/scanner.h"
-
-GUI_DisplayType_t gScreenToDisplay;
-volatile int8_t gStepDirection;
-GUI_DisplayType_t gRequestDisplayScreen;
-uint8_t g_200003BB;
-bool gWasFKeyPressed;
-
-uint8_t gAskForConfirmation;
-bool gAskToSave;
-bool gAskToDelete;
-
-void GUI_DisplayBatteryLevel(uint8_t BatteryLevel)
-{
-	const uint8_t *pBitmap;
-	bool bClearMode = false;
-
-	if (gCurrentFunction != 1) {
-		switch (BatteryLevel) {
-		case 0:
-			pBitmap = NULL;
-			bClearMode = 1;
-			break;
-		case 1:
-			pBitmap = BITMAP_BatteryLevel1;
-			break;
-		case 2:
-			pBitmap = BITMAP_BatteryLevel2;
-			break;
-		case 3:
-			pBitmap = BITMAP_BatteryLevel3;
-			break;
-		case 4:
-			pBitmap = BITMAP_BatteryLevel4;
-			break;
-		default:
-			pBitmap = BITMAP_BatteryLevel5;
-			break;
-		}
-		ST7565_DrawLine(110, 0, 18, pBitmap, bClearMode);
-	}
-}
-
-void GUI_Welcome(void)
-{
-	char WelcomeString0[16];
-	char WelcomeString1[16];
-
-	memset(gStatusLine, 0, sizeof(gStatusLine));
-	memset(gFrameBuffer, 0, sizeof(gFrameBuffer));
-
-	if (gEeprom.POWER_ON_DISPLAY_MODE == POWER_ON_DISPLAY_MODE_FULL_SCREEN) {
-		ST7565_FillScreen(0xFF);
-	} else {
-		memset(WelcomeString0, 0, sizeof(WelcomeString0));
-		memset(WelcomeString1, 0, sizeof(WelcomeString1));
-		if (gEeprom.POWER_ON_DISPLAY_MODE == POWER_ON_DISPLAY_MODE_VOLTAGE) {
-			sprintf(WelcomeString0, "VOLTAGE");
-			sprintf(WelcomeString1, "%.2fV", gBatteryVoltageAverage * 0.01);
-		} else {
-			EEPROM_ReadBuffer(0x0EB0, WelcomeString0, 16);
-			EEPROM_ReadBuffer(0x0EC0, WelcomeString1, 16);
-		}
-		UI_PrintString(WelcomeString0, 0, 127, 1, 10, true);
-		UI_PrintString(WelcomeString1, 0, 127, 3, 10, true);
-		ST7565_BlitStatusLine();
-		ST7565_BlitFullScreen();
-	}
-}
-
-void GUI_PasswordScreen(void)
-{
-	KEY_Code_t Key;
-	BEEP_Type_t Beep;
-
-	gUpdateDisplay = true;
-	memset(gInputBox, 10, sizeof(gInputBox));
-
-	while (1) {
-		while (!gNextTimeslice) {
-		}
-		// TODO: Original code doesn't do the below, but is needed for proper key debounce.
-		gNextTimeslice = false;
-		Key = KEYBOARD_Poll();
-		if (gKeyReading0 == Key) {
-			gDebounceCounter++;
-			if (gDebounceCounter == 2) {
-				if (Key == KEY_INVALID) {
-					gKeyReading1 = KEY_INVALID;
-				} else {
-					gKeyReading1 = Key;
-					switch (Key) {
-					case KEY_0: case KEY_1: case KEY_2: case KEY_3:
-					case KEY_4: case KEY_5: case KEY_6: case KEY_7:
-					case KEY_8: case KEY_9:
-						INPUTBOX_Append(Key - KEY_0);
-						if (gInputBoxIndex < 6) {
-							Beep = BEEP_1KHZ_60MS_OPTIONAL;
-						} else {
-							uint32_t Password;
-
-							gInputBoxIndex = 0;
-							NUMBER_Get(gInputBox, &Password);
-							if ((gEeprom.POWER_ON_PASSWORD * 100) == Password) {
-								AUDIO_PlayBeep(BEEP_1KHZ_60MS_OPTIONAL);
-								return;
-							}
-							memset(gInputBox, 10, sizeof(gInputBox));
-							Beep = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
-						}
-						AUDIO_PlayBeep(Beep);
-						gUpdateDisplay = true;
-						break;
-					case KEY_EXIT: // Delete digit
-						if (gInputBoxIndex) {
-							gInputBoxIndex -= 1;
-							gInputBox[gInputBoxIndex] = 10;
-							gUpdateDisplay = true;
-						}
-						AUDIO_PlayBeep(BEEP_1KHZ_60MS_OPTIONAL);
-					default:
-						break;
-					}
-				}
-				gKeyBeingHeld = false;
-			}
-		} else {
-			gDebounceCounter = 0;
-			gKeyReading0 = Key;
-		}
-#if 0
-		if (UART_CheckForCommand()) {
-			__disable_irq();
-			ProcessUartCommand();
-			__enable_irq();
-		}
-#endif
-		if (gUpdateDisplay) {
-			GUI_LockScreen();
-			gUpdateDisplay = false;
-		}
-	}
-}
-
-void GUI_LockScreen(void)
-{
-	char String[7];
-	uint8_t i;
-
-	memset(gStatusLine, 0, sizeof(gStatusLine));
-	memset(gFrameBuffer, 0, sizeof(gFrameBuffer));
-	strcpy(String, "LOCK");
-	UI_PrintString(String, 0, 127, 1, 10, true);
-	for (i = 0; i < 6; i++) {
-		if (gInputBox[i] == 10) {
-			String[i] = '-';
-		} else {
-			String[i] = '*';
-		}
-	}
-	String[6] = 0;
-	UI_PrintString(String, 0, 127, 3, 12, true);
-	ST7565_BlitStatusLine();
-	ST7565_BlitFullScreen();
-}
-
-void GUI_DisplayStatusLine(void)
-{
-	memset(gStatusLine, 0, sizeof(gStatusLine));
-	if (gCurrentFunction == FUNCTION_POWER_SAVE) {
-		memcpy(gStatusLine, BITMAP_PowerSave, sizeof(BITMAP_PowerSave));
-	}
-	if (gBatteryDisplayLevel < 2) {
-		if (gLowBatteryBlink == 1) {
-			memcpy(gStatusLine + 110, BITMAP_BatteryLevel1, sizeof(BITMAP_BatteryLevel1));
-		}
-	} else {
-		if (gBatteryDisplayLevel == 2) {
-			memcpy(gStatusLine + 110, BITMAP_BatteryLevel2, sizeof(BITMAP_BatteryLevel2));
-		} else if (gBatteryDisplayLevel == 3) {
-			memcpy(gStatusLine + 110, BITMAP_BatteryLevel3, sizeof(BITMAP_BatteryLevel3));
-		} else if (gBatteryDisplayLevel == 4) {
-			memcpy(gStatusLine + 110, BITMAP_BatteryLevel4, sizeof(BITMAP_BatteryLevel4));
-		} else {
-			memcpy(gStatusLine + 110, BITMAP_BatteryLevel5, sizeof(BITMAP_BatteryLevel5));
-		}
-	}
-	if (gChargingWithTypeC) {
-		memcpy(gStatusLine + 100, BITMAP_USB_C, sizeof(BITMAP_USB_C));
-	}
-	if (gEeprom.KEY_LOCK) {
-		memcpy(gStatusLine + 90, BITMAP_KeyLock, sizeof(BITMAP_KeyLock));
-	} else if (gWasFKeyPressed) {
-		memcpy(gStatusLine + 90, BITMAP_F_Key, sizeof(BITMAP_F_Key));
-	}
-
-	if (gEeprom.VOX_SWITCH) {
-		memcpy(gStatusLine + 71, BITMAP_VOX, sizeof(BITMAP_VOX));
-	}
-	if (gEeprom.CROSS_BAND_RX_TX != CROSS_BAND_OFF) {
-		memcpy(gStatusLine + 58, BITMAP_WX, sizeof(BITMAP_WX));
-	}
-	if (gEeprom.DUAL_WATCH != DUAL_WATCH_OFF) {
-		memcpy(gStatusLine + 45, BITMAP_TDR, sizeof(BITMAP_TDR));
-	}
-	if (gEeprom.VOICE_PROMPT != VOICE_PROMPT_OFF) {
-		memcpy(gStatusLine + 34, BITMAP_VoicePrompt, sizeof(BITMAP_VoicePrompt));
-	}
-	if (gSetting_KILLED) {
-		memset(gStatusLine + 21, 0xFF, 10);
-	}
-	else if (gFmRadioMode) {
-		memcpy(gStatusLine + 21, BITMAP_FM, sizeof(BITMAP_FM));
-	}
-	if (gIsNoaaMode) {
-		memcpy(gStatusLine + 7, BITMAP_NOAA, sizeof(BITMAP_NOAA));
-	}
-	ST7565_BlitStatusLine();
-}
-
-//
-
-void GUI_DisplayScreen(void)
-{
-	switch (gScreenToDisplay) {
-	case DISPLAY_MAIN:
-		UI_DisplayMain();
-		break;
-	case DISPLAY_FM:
-		UI_DisplayFM();
-		break;
-	case DISPLAY_MENU:
-		UI_DisplayMenu();
-		break;
-	case DISPLAY_SCANNER:
-		UI_DisplayScanner();
-		break;
-	case DISPLAY_AIRCOPY:
-		UI_DisplayAircopy();
-		break;
-	default:
-		break;
-	}
-}
-
-void GUI_SelectNextDisplay(GUI_DisplayType_t Display)
-{
-	if (Display != DISPLAY_INVALID) {
-		if (gScreenToDisplay != Display) {
-			gInputBoxIndex = 0;
-			gIsInSubMenu = false;
-			g_20000381 = 0;
-			gStepDirection = 0;
-			g_20000390 = 0;
-			gAskForConfirmation = 0;
-			g_200003BA = 0;
-			g_200003BB = 0;
-			gF_LOCK = false;
-			gAskToSave = false;
-			gAskToDelete = false;
-			if (gWasFKeyPressed) {
-				gWasFKeyPressed = false;
-				g_2000036F = 1;
-			}
-		}
-		gUpdateDisplay = true;
-		gScreenToDisplay = Display;
-	}
-}
-
diff --git a/helper.c b/helper.c
index a6f4028..4a4bc11 100644
--- a/helper.c
+++ b/helper.c
@@ -20,16 +20,12 @@
 #include "driver/keyboard.h"
 #include "driver/gpio.h"
 #include "driver/system.h"
-#include "gui.h"
 #include "helper.h"
 #include "misc.h"
 #include "radio.h"
 #include "settings.h"
 #include "ui/menu.h"
-
-KEY_Code_t gKeyReading0;
-KEY_Code_t gKeyReading1;
-uint8_t g_2000042A;
+#include "ui/ui.h"
 
 uint8_t HELPER_GetKey(void)
 {
@@ -48,7 +44,7 @@ uint8_t HELPER_GetKey(void)
 	if (Keys[0] == Keys[1]) {
 		gKeyReading0 = Keys[0];
 		gKeyReading1 = Keys[0];
-		g_2000042A = 2;
+		gDebounceCounter = 2;
 		if (i == KEY_SIDE1) {
 			ret = 1;
 		} else if (i == KEY_SIDE2) {
diff --git a/helper.h b/helper.h
index ece1304..fc02ce8 100644
--- a/helper.h
+++ b/helper.h
@@ -20,10 +20,6 @@
 #include <stdint.h>
 #include "driver/keyboard.h"
 
-extern KEY_Code_t gKeyReading0;
-extern KEY_Code_t gKeyReading1;
-extern uint8_t g_2000042A;
-
 uint8_t HELPER_GetKey(void);
 void HELPER_CheckBootKey(uint8_t KeyType);
 
diff --git a/battery.c b/helper/battery.c
similarity index 96%
rename from battery.c
rename to helper/battery.c
index 8b065fd..7f659b6 100644
--- a/battery.c
+++ b/helper/battery.c
@@ -16,9 +16,10 @@
 
 #include "battery.h"
 #include "driver/backlight.h"
-#include "gui.h"
 #include "misc.h"
+#include "ui/battery.h"
 #include "ui/menu.h"
+#include "ui/ui.h"
 
 uint16_t gBatteryCalibration[6];
 uint16_t gBatteryCurrentVoltage;
@@ -83,7 +84,7 @@ void BATTERY_GetReadings(bool bDisplayBatteryLevel)
 		} else {
 			gLowBattery = false;
 			if (bDisplayBatteryLevel) {
-				GUI_DisplayBatteryLevel(gBatteryDisplayLevel);
+				UI_DisplayBattery(gBatteryDisplayLevel);
 			}
 		}
 		g_20000400 = 0;
diff --git a/battery.h b/helper/battery.h
similarity index 100%
rename from battery.h
rename to helper/battery.h
diff --git a/main.c b/main.c
index 131284b..766ade8 100644
--- a/main.c
+++ b/main.c
@@ -20,7 +20,6 @@
 
 #include "app/app.h"
 #include "audio.h"
-#include "battery.h"
 #include "bsp/dp32g030/gpio.h"
 #include "bsp/dp32g030/portcon.h"
 #include "bsp/dp32g030/syscon.h"
@@ -40,11 +39,13 @@
 #include "dtmf.h"
 #include "external/printf/printf.h"
 #include "functions.h"
-#include "gui.h"
 #include "helper.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "radio.h"
 #include "settings.h"
+#include "ui/lock.h"
+#include "ui/welcome.h"
 
 static const char Version[] = "UV-K5 Firmware, v0.01 Open Edition\r\n";
 
@@ -104,7 +105,7 @@ void Main(void)
 		uint8_t KeyType;
 		uint8_t Channel;
 
-		GUI_Welcome();
+		UI_DisplayWelcome();
 		BACKLIGHT_TurnOn();
 		SYSTEM_DelayMs(1000);
 		gMenuListCount = 51;
@@ -113,7 +114,7 @@ void Main(void)
 		KeyType = HELPER_GetKey();
 		if (gEeprom.POWER_ON_PASSWORD < 1000000) {
 			g_2000036E = 1;
-			GUI_PasswordScreen();
+			UI_DisplayLock();
 			g_2000036E = 0;
 		}
 
diff --git a/misc.c b/misc.c
index 7736144..7b6034b 100644
--- a/misc.c
+++ b/misc.c
@@ -106,6 +106,7 @@ uint8_t g_200003B4;
 uint16_t g_200003B6;
 uint16_t g_200003B8;
 uint8_t g_200003BA;
+uint8_t g_200003BB;
 uint8_t g_200003BC;
 uint8_t g_200003BD;
 uint8_t g_200003BE;
@@ -165,7 +166,6 @@ uint8_t gNoaaChannel;
 bool gUpdateDisplay;
 uint8_t gFmRadioCountdown;
 uint8_t gA_Scan_Channel;
-uint8_t gDebounceCounter;
 uint8_t gDTMF_AUTO_RESET_TIME;
 bool gF_LOCK;
 uint8_t gScanChannel;
@@ -194,6 +194,8 @@ int16_t gFM_FrequencyDeviation;
 
 uint16_t gCurrentRSSI;
 
+volatile int8_t gStepDirection;
+
 // --------
 
 void NUMBER_Get(char *pDigits, uint32_t *pInteger)
diff --git a/misc.h b/misc.h
index 959cf0c..791c545 100644
--- a/misc.h
+++ b/misc.h
@@ -115,6 +115,7 @@ extern uint8_t g_200003B4;
 extern uint16_t g_200003B6;
 extern uint16_t g_200003B8;
 extern uint8_t g_200003BA;
+extern uint8_t g_200003BB;
 extern uint8_t g_200003BC;
 extern uint8_t g_200003BD;
 extern uint8_t g_200003BE;
@@ -174,7 +175,6 @@ extern uint8_t gNoaaChannel;
 extern bool gUpdateDisplay;
 extern uint8_t gFmRadioCountdown;
 extern uint8_t gA_Scan_Channel;
-extern uint8_t gDebounceCounter;
 extern uint8_t gDTMF_AUTO_RESET_TIME;
 extern bool gF_LOCK;
 extern uint8_t gScanChannel;
@@ -202,6 +202,8 @@ extern int16_t gFM_FrequencyDeviation;
 
 extern uint16_t gCurrentRSSI;
 
+extern volatile int8_t gStepDirection;
+
 // --------
 
 void NUMBER_Get(char *pDigits, uint32_t *pInteger);
diff --git a/radio.c b/radio.c
index 38c6b1f..27aab9c 100644
--- a/radio.c
+++ b/radio.c
@@ -16,7 +16,6 @@
 
 #include <string.h>
 #include "audio.h"
-#include "battery.h"
 #include "bsp/dp32g030/gpio.h"
 #include "dcs.h"
 #include "driver/bk4819.h"
@@ -26,6 +25,7 @@
 #include "fm.h"
 #include "frequencies.h"
 #include "functions.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "radio.h"
 #include "settings.h"
diff --git a/scheduler.c b/scheduler.c
index 8f80c6e..40fa6eb 100644
--- a/scheduler.c
+++ b/scheduler.c
@@ -15,9 +15,8 @@
  */
 
 #include "audio.h"
-#include "battery.h"
 #include "functions.h"
-#include "gui.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "settings.h"
 
diff --git a/ui/battery.c b/ui/battery.c
new file mode 100644
index 0000000..e96e595
--- /dev/null
+++ b/ui/battery.c
@@ -0,0 +1,53 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#include <stddef.h>
+#include "bitmaps.h"
+#include "driver/st7565.h"
+#include "functions.h"
+#include "ui/battery.h"
+
+void UI_DisplayBattery(uint8_t Level)
+{
+	const uint8_t *pBitmap;
+	bool bClearMode = false;
+
+	if (gCurrentFunction != 1) {
+		switch (Level) {
+		case 0:
+			pBitmap = NULL;
+			bClearMode = 1;
+			break;
+		case 1:
+			pBitmap = BITMAP_BatteryLevel1;
+			break;
+		case 2:
+			pBitmap = BITMAP_BatteryLevel2;
+			break;
+		case 3:
+			pBitmap = BITMAP_BatteryLevel3;
+			break;
+		case 4:
+			pBitmap = BITMAP_BatteryLevel4;
+			break;
+		default:
+			pBitmap = BITMAP_BatteryLevel5;
+			break;
+		}
+		ST7565_DrawLine(110, 0, 18, pBitmap, bClearMode);
+	}
+}
+
diff --git a/ui/battery.h b/ui/battery.h
new file mode 100644
index 0000000..899aea6
--- /dev/null
+++ b/ui/battery.h
@@ -0,0 +1,26 @@
+
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#ifndef UI_BATTERY_H
+#define UI_BATTERY_H
+
+#include <stdint.h>
+
+void UI_DisplayBattery(uint8_t Level);
+
+#endif
+
diff --git a/ui/fmradio.c b/ui/fmradio.c
index 4464dd0..8b6d74c 100644
--- a/ui/fmradio.c
+++ b/ui/fmradio.c
@@ -18,12 +18,12 @@
 #include "driver/st7565.h"
 #include "external/printf/printf.h"
 #include "fm.h"
-#include "gui.h"
 #include "misc.h"
 #include "settings.h"
 #include "ui/fmradio.h"
 #include "ui/helper.h"
 #include "ui/inputbox.h"
+#include "ui/ui.h"
 
 void UI_DisplayFM(void)
 {
diff --git a/ui/lock.c b/ui/lock.c
new file mode 100644
index 0000000..eabd1b6
--- /dev/null
+++ b/ui/lock.c
@@ -0,0 +1,122 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#include <string.h>
+#include "audio.h"
+#include "driver/keyboard.h"
+#include "driver/st7565.h"
+#include "misc.h"
+#include "settings.h"
+#include "ui/helper.h"
+#include "ui/inputbox.h"
+#include "ui/lock.h"
+
+static void Render(void)
+{
+	char String[7];
+	uint8_t i;
+
+	memset(gStatusLine, 0, sizeof(gStatusLine));
+	memset(gFrameBuffer, 0, sizeof(gFrameBuffer));
+	strcpy(String, "LOCK");
+	UI_PrintString(String, 0, 127, 1, 10, true);
+	for (i = 0; i < 6; i++) {
+		if (gInputBox[i] == 10) {
+			String[i] = '-';
+		} else {
+			String[i] = '*';
+		}
+	}
+	String[6] = 0;
+	UI_PrintString(String, 0, 127, 3, 12, true);
+	ST7565_BlitStatusLine();
+	ST7565_BlitFullScreen();
+}
+
+void UI_DisplayLock(void)
+{
+	KEY_Code_t Key;
+	BEEP_Type_t Beep;
+
+	gUpdateDisplay = true;
+	memset(gInputBox, 10, sizeof(gInputBox));
+
+	while (1) {
+		while (!gNextTimeslice) {
+		}
+		// TODO: Original code doesn't do the below, but is needed for proper key debounce.
+		gNextTimeslice = false;
+		Key = KEYBOARD_Poll();
+		if (gKeyReading0 == Key) {
+			gDebounceCounter++;
+			if (gDebounceCounter == 2) {
+				if (Key == KEY_INVALID) {
+					gKeyReading1 = KEY_INVALID;
+				} else {
+					gKeyReading1 = Key;
+					switch (Key) {
+					case KEY_0: case KEY_1: case KEY_2: case KEY_3:
+					case KEY_4: case KEY_5: case KEY_6: case KEY_7:
+					case KEY_8: case KEY_9:
+						INPUTBOX_Append(Key - KEY_0);
+						if (gInputBoxIndex < 6) {
+							Beep = BEEP_1KHZ_60MS_OPTIONAL;
+						} else {
+							uint32_t Password;
+
+							gInputBoxIndex = 0;
+							NUMBER_Get(gInputBox, &Password);
+							if ((gEeprom.POWER_ON_PASSWORD * 100) == Password) {
+								AUDIO_PlayBeep(BEEP_1KHZ_60MS_OPTIONAL);
+								return;
+							}
+							memset(gInputBox, 10, sizeof(gInputBox));
+							Beep = BEEP_500HZ_60MS_DOUBLE_BEEP_OPTIONAL;
+						}
+						AUDIO_PlayBeep(Beep);
+						gUpdateDisplay = true;
+						break;
+					case KEY_EXIT: // Delete digit
+						if (gInputBoxIndex) {
+							gInputBoxIndex -= 1;
+							gInputBox[gInputBoxIndex] = 10;
+							gUpdateDisplay = true;
+						}
+						AUDIO_PlayBeep(BEEP_1KHZ_60MS_OPTIONAL);
+					default:
+						break;
+					}
+				}
+				gKeyBeingHeld = false;
+			}
+		} else {
+			gDebounceCounter = 0;
+			gKeyReading0 = Key;
+		}
+#if 0
+		if (UART_CheckForCommand()) {
+			__disable_irq();
+			ProcessUartCommand();
+			__enable_irq();
+		}
+#endif
+		if (gUpdateDisplay) {
+			Render();
+			gUpdateDisplay = false;
+		}
+	}
+}
+
diff --git a/ui/lock.h b/ui/lock.h
new file mode 100644
index 0000000..4ad4f49
--- /dev/null
+++ b/ui/lock.h
@@ -0,0 +1,23 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#ifndef UI_LOCK_H
+#define UI_LOCK_H
+
+void UI_DisplayLock(void);
+
+#endif
+
diff --git a/ui/menu.c b/ui/menu.c
index 8c5e43e..6548681 100644
--- a/ui/menu.c
+++ b/ui/menu.c
@@ -15,28 +15,18 @@
  */
 
 #include <string.h>
-//#include "app/aircopy.h"
-//#include "audio.h"
-#include "battery.h"
 #include "bitmaps.h"
 #include "dcs.h"
-//#include "driver/eeprom.h"
-//#include "driver/keyboard.h"
 #include "driver/st7565.h"
 #include "dtmf.h"
 #include "external/printf/printf.h"
-//#include "font.h"
-//#include "fm.h"
-//#include "functions.h"
-#include "gui.h"
-//#include "helper.h"
+#include "helper/battery.h"
 #include "misc.h"
 #include "settings.h"
-//#include "ui/aircopy.h"
-//#include "ui/fmradio.h"
 #include "ui/helper.h"
 #include "ui/inputbox.h"
 #include "ui/menu.h"
+#include "ui/ui.h"
 
 static const char MenuList[][7] = {
 	// 0x00
diff --git a/ui/rssi.c b/ui/rssi.c
index 162b0db..23907c4 100644
--- a/ui/rssi.c
+++ b/ui/rssi.c
@@ -18,10 +18,10 @@
 #include "bitmaps.h"
 #include "driver/st7565.h"
 #include "functions.h"
-#include "gui.h"
 #include "misc.h"
 #include "settings.h"
 #include "ui/rssi.h"
+#include "ui/ui.h"
 
 static void Render(uint8_t RssiLevel, uint8_t VFO)
 {
diff --git a/ui/scanner.c b/ui/scanner.c
index 084fd75..fc55991 100644
--- a/ui/scanner.c
+++ b/ui/scanner.c
@@ -19,7 +19,6 @@
 #include "dcs.h"
 #include "driver/st7565.h"
 #include "external/printf/printf.h"
-#include "gui.h"
 #include "misc.h"
 #include "ui/helper.h"
 #include "ui/scanner.h"
diff --git a/ui/status.c b/ui/status.c
new file mode 100644
index 0000000..4a0c32e
--- /dev/null
+++ b/ui/status.c
@@ -0,0 +1,81 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#include <string.h>
+#include "bitmaps.h"
+#include "driver/keyboard.h"
+#include "driver/st7565.h"
+#include "fm.h"
+#include "functions.h"
+#include "helper/battery.h"
+#include "misc.h"
+#include "settings.h"
+#include "ui/status.h"
+
+void UI_DisplayStatus(void)
+{
+	memset(gStatusLine, 0, sizeof(gStatusLine));
+	if (gCurrentFunction == FUNCTION_POWER_SAVE) {
+		memcpy(gStatusLine, BITMAP_PowerSave, sizeof(BITMAP_PowerSave));
+	}
+	if (gBatteryDisplayLevel < 2) {
+		if (gLowBatteryBlink == 1) {
+			memcpy(gStatusLine + 110, BITMAP_BatteryLevel1, sizeof(BITMAP_BatteryLevel1));
+		}
+	} else {
+		if (gBatteryDisplayLevel == 2) {
+			memcpy(gStatusLine + 110, BITMAP_BatteryLevel2, sizeof(BITMAP_BatteryLevel2));
+		} else if (gBatteryDisplayLevel == 3) {
+			memcpy(gStatusLine + 110, BITMAP_BatteryLevel3, sizeof(BITMAP_BatteryLevel3));
+		} else if (gBatteryDisplayLevel == 4) {
+			memcpy(gStatusLine + 110, BITMAP_BatteryLevel4, sizeof(BITMAP_BatteryLevel4));
+		} else {
+			memcpy(gStatusLine + 110, BITMAP_BatteryLevel5, sizeof(BITMAP_BatteryLevel5));
+		}
+	}
+	if (gChargingWithTypeC) {
+		memcpy(gStatusLine + 100, BITMAP_USB_C, sizeof(BITMAP_USB_C));
+	}
+	if (gEeprom.KEY_LOCK) {
+		memcpy(gStatusLine + 90, BITMAP_KeyLock, sizeof(BITMAP_KeyLock));
+	} else if (gWasFKeyPressed) {
+		memcpy(gStatusLine + 90, BITMAP_F_Key, sizeof(BITMAP_F_Key));
+	}
+
+	if (gEeprom.VOX_SWITCH) {
+		memcpy(gStatusLine + 71, BITMAP_VOX, sizeof(BITMAP_VOX));
+	}
+	if (gEeprom.CROSS_BAND_RX_TX != CROSS_BAND_OFF) {
+		memcpy(gStatusLine + 58, BITMAP_WX, sizeof(BITMAP_WX));
+	}
+	if (gEeprom.DUAL_WATCH != DUAL_WATCH_OFF) {
+		memcpy(gStatusLine + 45, BITMAP_TDR, sizeof(BITMAP_TDR));
+	}
+	if (gEeprom.VOICE_PROMPT != VOICE_PROMPT_OFF) {
+		memcpy(gStatusLine + 34, BITMAP_VoicePrompt, sizeof(BITMAP_VoicePrompt));
+	}
+	if (gSetting_KILLED) {
+		memset(gStatusLine + 21, 0xFF, 10);
+	}
+	else if (gFmRadioMode) {
+		memcpy(gStatusLine + 21, BITMAP_FM, sizeof(BITMAP_FM));
+	}
+	if (gIsNoaaMode) {
+		memcpy(gStatusLine + 7, BITMAP_NOAA, sizeof(BITMAP_NOAA));
+	}
+	ST7565_BlitStatusLine();
+}
+
diff --git a/ui/status.h b/ui/status.h
new file mode 100644
index 0000000..cfa32a5
--- /dev/null
+++ b/ui/status.h
@@ -0,0 +1,23 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#ifndef UI_STATUS_H
+#define UI_STATUS_H
+
+void UI_DisplayStatus(void);
+
+#endif
+
diff --git a/ui/ui.c b/ui/ui.c
new file mode 100644
index 0000000..6bb7cc3
--- /dev/null
+++ b/ui/ui.c
@@ -0,0 +1,82 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#include <string.h>
+#include "driver/keyboard.h"
+#include "misc.h"
+#include "ui/aircopy.h"
+#include "ui/fmradio.h"
+#include "ui/inputbox.h"
+#include "ui/main.h"
+#include "ui/menu.h"
+#include "ui/scanner.h"
+#include "ui/ui.h"
+
+GUI_DisplayType_t gScreenToDisplay;
+GUI_DisplayType_t gRequestDisplayScreen;
+
+uint8_t gAskForConfirmation;
+bool gAskToSave;
+bool gAskToDelete;
+
+void GUI_DisplayScreen(void)
+{
+	switch (gScreenToDisplay) {
+	case DISPLAY_MAIN:
+		UI_DisplayMain();
+		break;
+	case DISPLAY_FM:
+		UI_DisplayFM();
+		break;
+	case DISPLAY_MENU:
+		UI_DisplayMenu();
+		break;
+	case DISPLAY_SCANNER:
+		UI_DisplayScanner();
+		break;
+	case DISPLAY_AIRCOPY:
+		UI_DisplayAircopy();
+		break;
+	default:
+		break;
+	}
+}
+
+void GUI_SelectNextDisplay(GUI_DisplayType_t Display)
+{
+	if (Display != DISPLAY_INVALID) {
+		if (gScreenToDisplay != Display) {
+			gInputBoxIndex = 0;
+			gIsInSubMenu = false;
+			g_20000381 = 0;
+			gStepDirection = 0;
+			g_20000390 = 0;
+			gAskForConfirmation = 0;
+			g_200003BA = 0;
+			g_200003BB = 0;
+			gF_LOCK = false;
+			gAskToSave = false;
+			gAskToDelete = false;
+			if (gWasFKeyPressed) {
+				gWasFKeyPressed = false;
+				g_2000036F = 1;
+			}
+		}
+		gUpdateDisplay = true;
+		gScreenToDisplay = Display;
+	}
+}
+
diff --git a/gui.h b/ui/ui.h
similarity index 82%
rename from gui.h
rename to ui/ui.h
index 5729f60..f2809a1 100644
--- a/gui.h
+++ b/ui/ui.h
@@ -32,21 +32,12 @@ enum GUI_DisplayType_t {
 typedef enum GUI_DisplayType_t GUI_DisplayType_t;
 
 extern GUI_DisplayType_t gScreenToDisplay;
-extern volatile int8_t gStepDirection;
 extern GUI_DisplayType_t gRequestDisplayScreen;
-extern uint8_t g_200003BB;
-extern bool gWasFKeyPressed;
 
 extern uint8_t gAskForConfirmation;
 extern bool gAskToSave;
 extern bool gAskToDelete;
 
-void GUI_DisplayBatteryLevel(uint8_t BatteryLevel);
-void GUI_Welcome(void);
-void GUI_PasswordScreen(void);
-void GUI_LockScreen(void);
-void GUI_DisplayStatusLine(void);
-
 void GUI_DisplayScreen(void);
 void GUI_SelectNextDisplay(GUI_DisplayType_t Display);
 
diff --git a/ui/welcome.c b/ui/welcome.c
new file mode 100644
index 0000000..dda9ad5
--- /dev/null
+++ b/ui/welcome.c
@@ -0,0 +1,52 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#include <string.h>
+#include "driver/eeprom.h"
+#include "driver/st7565.h"
+#include "external/printf/printf.h"
+#include "helper/battery.h"
+#include "settings.h"
+#include "ui/helper.h"
+#include "ui/welcome.h"
+
+void UI_DisplayWelcome(void)
+{
+	char WelcomeString0[16];
+	char WelcomeString1[16];
+
+	memset(gStatusLine, 0, sizeof(gStatusLine));
+	memset(gFrameBuffer, 0, sizeof(gFrameBuffer));
+
+	if (gEeprom.POWER_ON_DISPLAY_MODE == POWER_ON_DISPLAY_MODE_FULL_SCREEN) {
+		ST7565_FillScreen(0xFF);
+	} else {
+		memset(WelcomeString0, 0, sizeof(WelcomeString0));
+		memset(WelcomeString1, 0, sizeof(WelcomeString1));
+		if (gEeprom.POWER_ON_DISPLAY_MODE == POWER_ON_DISPLAY_MODE_VOLTAGE) {
+			sprintf(WelcomeString0, "VOLTAGE");
+			sprintf(WelcomeString1, "%.2fV", gBatteryVoltageAverage * 0.01);
+		} else {
+			EEPROM_ReadBuffer(0x0EB0, WelcomeString0, 16);
+			EEPROM_ReadBuffer(0x0EC0, WelcomeString1, 16);
+		}
+		UI_PrintString(WelcomeString0, 0, 127, 1, 10, true);
+		UI_PrintString(WelcomeString1, 0, 127, 3, 10, true);
+		ST7565_BlitStatusLine();
+		ST7565_BlitFullScreen();
+	}
+}
+
diff --git a/ui/welcome.h b/ui/welcome.h
new file mode 100644
index 0000000..1f7c6dd
--- /dev/null
+++ b/ui/welcome.h
@@ -0,0 +1,23 @@
+/* Copyright 2023 Dual Tachyon
+ * https://github.com/DualTachyon
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *     Unless required by applicable law or agreed to in writing, software
+ *     distributed under the License is distributed on an "AS IS" BASIS,
+ *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *     See the License for the specific language governing permissions and
+ *     limitations under the License.
+ */
+
+#ifndef UI_WELCOME_H
+#define UI_WELCOME_H
+
+void UI_DisplayWelcome(void);
+
+#endif
+