Themes: selectable on-device presets (Custom / BASIC 80s / Terminal)

Add a Theme selector in Display Options that cycles three presets with a live
preview: Custom (CPS-editable, default), BASIC 80s (Commodore 64 light-blue on
blue) and Terminal (green-on-black night / black-on-green day). Presets fill all
theme items for a cohesive look.

The selection is stored in the codeplug custom-data area (new THEME_PRESET
block), which is migration-safe (missing block -> Custom) and needs no settings
reset. CPS theme edits only ever change the Custom theme. Documented in MANUAL.md
and the README.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,11 @@ single running list until the first versioned release.
 
 ## Unreleased
 
+- **Theme presets** — selectable on the radio in Display Options → "Theme":
+  **Custom** (CPS-editable, default), **BASIC 80s** (Commodore 64 blue/light-blue),
+  and **Terminal** (green-on-black night / black-on-green day). The choice is stored
+  in the codeplug custom-data area (migration-safe; defaults to Custom), and CPS
+  theme edits only ever change Custom.
 - **Fix:** green LED **flickering** between the red flashes while muted during a DMR
   QSO. The DMR RX handler re-asserts the green LED as soon as it reads it off, racing
   the main-loop mute clear; the green LED is now **held off at the driver** for the

MANUAL.md

@@ -58,6 +58,17 @@ Optionally dims the backlight after inactivity to **100 / 50 / 30 / 15 %** of th
 configured brightness (only in **Auto** backlight mode). Any activity restores full
 brightness. Set it in **Menu → Options → Display Options → Screen Dim**.
 
+### Theme presets — 🟢 [FreeTRX]
+Pick a colour theme on the radio at **Menu → Options → Display Options → "Theme"**
+(◀/▶ to change; the screen updates live):
+
+- **Custom** — the theme edited via the CPS or the on-radio colour editor (default).
+- **BASIC 80s** — a Commodore-64 look (light blue on blue).
+- **Terminal** — a green terminal (green-on-black at night, black-on-green by day).
+
+Editing colours in the CPS only affects **Custom**; the two built-in presets are
+fixed. Every element (S-meter, frequencies, menus) follows the selected theme.
+
 ### Main-menu icons — 🟢 [FreeTRX]
 Each top-level menu entry has a small icon next to it.
 

MDUV380_firmware/application/include/functions/codeplug.h

@@ -353,6 +353,7 @@ typedef enum
 	CODEPLUG_CUSTOM_DATA_TYPE_SATELLITE_TLE,
 	CODEPLUG_CUSTOM_DATA_TYPE_THEME_DAY,
 	CODEPLUG_CUSTOM_DATA_TYPE_THEME_NIGHT,
+	CODEPLUG_CUSTOM_DATA_TYPE_THEME_PRESET, // FreeTRX: 1 byte, selected theme preset (themePreset_t)
 } CodeplugCustomDataType_t;
 
 

MDUV380_firmware/application/include/hardware/HX8353E.h

@@ -269,8 +269,21 @@ void displayDrawFrequencySevenSeg(int16_t x, int16_t y, int16_t cellW, int16_t c
 #endif
 
 #if defined(HAS_COLOURS)
+// FreeTRX selectable theme presets. CUSTOM is the CPS-editable theme (default);
+// the others are fixed palettes baked into the firmware.
+typedef enum
+{
+	THEME_PRESET_CUSTOM = 0, // editable via CPS / on-device colour editor
+	THEME_PRESET_BASIC80S,   // Commodore 64 BASIC (light blue on blue)
+	THEME_PRESET_TERMINAL,   // green terminal (green-on-black night / black-on-green day)
+	NUM_THEME_PRESETS
+} themePreset_t;
+
 void themeInitToDefaultValues(DayTime_t daytime, bool invert);
 void themeInit(bool SPIFlashAvailable);
+void themeApplyPreset(uint8_t preset);     // rebuild themeItems[] for the given preset
+uint8_t themeGetPreset(void);              // read the stored preset (default CUSTOM)
+void themeSetPreset(uint8_t preset, bool save); // apply, and optionally persist to the codeplug
 void displayThemeApply(themeItem_t fgItem, themeItem_t bgItem);
 void displayThemeResetToDefault(void);
 bool displayThemeIsForegroundColourEqualTo(themeItem_t fgItem);

MDUV380_firmware/application/source/hardware/HX8353E_display.c

@@ -1510,29 +1510,105 @@ void themeInitToDefaultValues(DayTime_t daytime, bool invert)
 	themeItems[daytime][THEME_ITEM_FG_BD_COLOUR] = PLATFORM_COLOUR_FORMAT_SWAP_BYTES(RGB888_TO_PLATFORM_COLOUR_FORMAT(0xFF0000U));
 }
 
-void themeInit(bool SPIFlashAvailable)
+// Set every theme item to fgRGB, then override the background items with bgRGB, for
+// a cohesive single-palette look. The selected-menu-item background is intentionally
+// left as the foreground colour so the highlighted row still inverts.
+static void themeSetAllItems(DayTime_t daytime, uint32_t fgRGB, uint32_t bgRGB)
 {
+	uint16_t fg = PLATFORM_COLOUR_FORMAT_SWAP_BYTES(RGB888_TO_PLATFORM_COLOUR_FORMAT(fgRGB));
+	uint16_t bg = PLATFORM_COLOUR_FORMAT_SWAP_BYTES(RGB888_TO_PLATFORM_COLOUR_FORMAT(bgRGB));
+
+	for (int i = 0; i < THEME_ITEM_MAX; i++)
+	{
+		themeItems[daytime][i] = fg;
+	}
+	themeItems[daytime][THEME_ITEM_BG] = bg;
+	themeItems[daytime][THEME_ITEM_BG_SPLASHSCREEN] = bg;
+	themeItems[daytime][THEME_ITEM_BG_NOTIFICATION] = bg;
+	themeItems[daytime][THEME_ITEM_BG_MENU_NAME] = bg;
+	themeItems[daytime][THEME_ITEM_BG_HEADER_TEXT] = bg;
+	// THEME_ITEM_BG_MENU_ITEM_SELECTED intentionally left = fg (inverts the selected row).
+}
+
+void themeApplyPreset(uint8_t preset)
+{
+	// Start from the monochrome defaults, then overlay the chosen preset.
 	themeInitToDefaultValues(NIGHT, true);
 	themeInitToDefaultValues(DAY, false);
 
-	// Read and apply user's theme, if any
+	switch (preset)
-	if (SPIFlashAvailable)
+	{
+		case THEME_PRESET_BASIC80S: // Commodore 64 BASIC: light blue on blue (day & night)
+			themeSetAllItems(DAY,   0x7C71D5, 0x3E31A2);
+			themeSetAllItems(NIGHT, 0x7C71D5, 0x3E31A2);
+			break;
+
+		case THEME_PRESET_TERMINAL:
+			themeSetAllItems(DAY,   0x000000, 0x00A000); // black on green
+			themeSetAllItems(NIGHT, 0x00E000, 0x000000); // green on black
+			break;
+
+		case THEME_PRESET_CUSTOM:
+		default:
+			// Overlay the user's Custom theme from the codeplug, if present (CPS edits
+			// only ever touch this).
 			{
 				uint16_t themingTmp[THEME_ITEM_MAX];
 
 				if (codeplugGetOpenGD77CustomData(CODEPLUG_CUSTOM_DATA_TYPE_THEME_DAY, (uint8_t *) &themingTmp))
 				{
 					memcpy(&themeItems[DAY], &themingTmp, sizeof(themingTmp));
-
-			foregroundColour = themeItems[DAY][THEME_ITEM_FG_DEFAULT];
-			backgroundColour = themeItems[DAY][THEME_ITEM_BG];
 				}
-
 				if (codeplugGetOpenGD77CustomData(CODEPLUG_CUSTOM_DATA_TYPE_THEME_NIGHT, (uint8_t *) &themingTmp))
 				{
 					memcpy(&themeItems[NIGHT], &themingTmp, sizeof(themingTmp));
 				}
 			}
+			break;
+	}
+
+	foregroundColour = themeItems[DAY][THEME_ITEM_FG_DEFAULT];
+	backgroundColour = themeItems[DAY][THEME_ITEM_BG];
+}
+
+uint8_t themeGetPreset(void)
+{
+	uint8_t buf[4] = { THEME_PRESET_CUSTOM, 0, 0, 0 };
+
+	if (codeplugGetOpenGD77CustomData(CODEPLUG_CUSTOM_DATA_TYPE_THEME_PRESET, buf))
+	{
+		return (buf[0] < NUM_THEME_PRESETS) ? buf[0] : THEME_PRESET_CUSTOM;
+	}
+	return THEME_PRESET_CUSTOM;
+}
+
+void themeSetPreset(uint8_t preset, bool save)
+{
+	if (preset >= NUM_THEME_PRESETS)
+	{
+		preset = THEME_PRESET_CUSTOM;
+	}
+
+	themeApplyPreset(preset);
+
+	if (save)
+	{
+		uint8_t buf[1] = { preset };
+		codeplugSetOpenGD77CustomData(CODEPLUG_CUSTOM_DATA_TYPE_THEME_PRESET, buf, sizeof(buf));
+	}
+}
+
+void themeInit(bool SPIFlashAvailable)
+{
+	if (SPIFlashAvailable)
+	{
+		themeApplyPreset(themeGetPreset());
+	}
+	else
+	{
+		themeInitToDefaultValues(NIGHT, true);
+		themeInitToDefaultValues(DAY, false);
+	}
 
 	if (settingsIsOptionBitSet(BIT_AUTO_NIGHT_OVERRIDE) && (uiDataGlobal.daytimeOverridden == NIGHT))
 	{

MDUV380_firmware/application/source/user_interface/menuDisplayOptions.c

@@ -104,6 +104,9 @@ enum
 	DISPLAY_SHOW_DISTANCE,
 	DISPLAY_DMR_LAST_TALKER_ON_SCREEN,
 	DISPLAY_SCREEN_DIM,
+#if defined(HAS_COLOURS)
+	DISPLAY_THEME_PRESET,
+#endif
 	NUM_DISPLAY_MENU_ITEMS
 };
 
@@ -269,6 +272,18 @@ static void updateScreen(bool isFirstRun)
 					}
 					break;
 
+#if defined(HAS_COLOURS)
+				case DISPLAY_THEME_PRESET:
+					{
+						// Preset names are plain literals -> rightSideVar (voice-safe).
+						const char *presetNames[] = { "Custom", "BASIC 80s", "Terminal" };
+						uint8_t p = themeGetPreset();
+						leftSide = "Theme";
+						snprintf(rightSideVar, SCREEN_LINE_BUFFER_SIZE, "%s", presetNames[(p < NUM_THEME_PRESETS) ? p : 0]);
+					}
+					break;
+#endif
+
 #if ! defined(PLATFORM_GD77S)
 				case DISPLAY_AUTO_NIGHT:
 					leftSide = currentLanguage->auto_night;
@@ -630,6 +645,19 @@ static void handleEvent(uiEvent_t *ev)
 					}
 					break;
 
+#if defined(HAS_COLOURS)
+				case DISPLAY_THEME_PRESET:
+					{
+						uint8_t p = themeGetPreset();
+						if (p < (NUM_THEME_PRESETS - 1))
+						{
+							themeSetPreset(p + 1, true); // apply + persist, live preview
+							displayThemeResetToDefault();
+						}
+					}
+					break;
+#endif
+
 #if ! defined(PLATFORM_GD77S)
 				case DISPLAY_AUTO_NIGHT:
 					if (settingsIsOptionBitSet(BIT_AUTO_NIGHT) == false)
@@ -839,6 +867,19 @@ static void handleEvent(uiEvent_t *ev)
 					}
 					break;
 
+#if defined(HAS_COLOURS)
+				case DISPLAY_THEME_PRESET:
+					{
+						uint8_t p = themeGetPreset();
+						if (p > THEME_PRESET_CUSTOM)
+						{
+							themeSetPreset(p - 1, true); // apply + persist, live preview
+							displayThemeResetToDefault();
+						}
+					}
+					break;
+#endif
+
 #if ! defined(PLATFORM_GD77S)
 				case DISPLAY_AUTO_NIGHT:
 					if (settingsIsOptionBitSet(BIT_AUTO_NIGHT))

README.md

@@ -35,6 +35,9 @@ FreeTRX keeps OpenGD77's core (DMR/FM, hotspot, CPS compatibility) and adds:
 - **7-segment "LED" frequency font** on the VFO and the SK1-held frequency view.
 - **Screen dimming** — optionally dim the backlight to 100 / 50 / 30 / 15 % after
   inactivity (Auto backlight mode); new setting in Display Options.
+- **Theme presets** — pick a colour theme on the radio: **Custom** (CPS-editable,
+  default), **BASIC 80s** (Commodore 64), or **Terminal** (green-on-black). CPS edits
+  only affect Custom.
 - **On-radio channel management** — create and delete channels directly from the
   Channel quick menu, no PC/CPS required (see [Managing channels](#managing-channels-on-the-radio)).
 - **Main-menu icons** next to each top-level entry.