Drop gScreenToDisplay switch and use function table

Saves some bytes

app/app.c

@@ -14,6 +14,8 @@
  *     limitations under the License.
  */
 
+#include <assert.h>
+#include <stdint.h>
 #include <string.h>
 
 #include "am_fix.h"
@@ -72,6 +74,23 @@
 static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld);
 
 
+void (*ProcessKeysFunctions[])(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld) = {
+	[DISPLAY_MAIN] = &MAIN_ProcessKeys,
+	[DISPLAY_MENU] = &MENU_ProcessKeys,
+	[DISPLAY_SCANNER] = &SCANNER_ProcessKeys,
+
+#ifdef ENABLE_FMRADIO
+	[DISPLAY_FM] = &FM_ProcessKeys,
+#endif
+
+#ifdef ENABLE_AIRCOPY
+	[DISPLAY_AIRCOPY] = &AIRCOPY_ProcessKeys,
+#endif
+};
+
+static_assert(ARRAY_SIZE(ProcessKeysFunctions) == DISPLAY_N_ELEM);
+
+
 
 static void CheckForIncoming(void)
 {
@@ -1580,8 +1599,6 @@ static void ALARM_Off(void)
 }
 #endif
 
-
-
 static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 {
 	if (Key == KEY_EXIT && !BACKLIGHT_IsOn() && gEeprom.BACKLIGHT_TIME > 0)
@@ -1849,33 +1866,8 @@ static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld)
 			}
 #endif
 		}
-		else if (Key != KEY_SIDE1 && Key != KEY_SIDE2) {
-			switch (gScreenToDisplay) {
-				case DISPLAY_MAIN:
-					MAIN_ProcessKeys(Key, bKeyPressed, bKeyHeld);
-					break;
-#ifdef ENABLE_FMRADIO
-				case DISPLAY_FM:
-					FM_ProcessKeys(Key, bKeyPressed, bKeyHeld);
-					break;
-#endif
-				case DISPLAY_MENU:
-					MENU_ProcessKeys(Key, bKeyPressed, bKeyHeld);
-					break;
-
-				case DISPLAY_SCANNER:
-					SCANNER_ProcessKeys(Key, bKeyPressed, bKeyHeld);
-					break;
-
-#ifdef ENABLE_AIRCOPY
-				case DISPLAY_AIRCOPY:
-					AIRCOPY_ProcessKeys(Key, bKeyPressed, bKeyHeld);
-					break;
-#endif
-				case DISPLAY_INVALID:
-				default:
-					break;
-			}
+		else if (Key != KEY_SIDE1 && Key != KEY_SIDE2 && gScreenToDisplay != DISPLAY_INVALID) {
+			ProcessKeysFunctions[gScreenToDisplay](Key, bKeyPressed, bKeyHeld);
 		}
 		else
 #ifdef ENABLE_AIRCOPY

functions.c

@@ -92,36 +92,19 @@ void FUNCTION_Init(void)
 	gUpdateStatus = true;
 }
 
-void FUNCTION_Select(FUNCTION_Type_t Function)
+void FUNCTION_Foreground(const FUNCTION_Type_t PreviousFunction)
 {
-	const FUNCTION_Type_t PreviousFunction = gCurrentFunction;
-	const bool            bWasPowerSave    = (PreviousFunction == FUNCTION_POWER_SAVE);
-
-	gCurrentFunction = Function;
-
-	if (bWasPowerSave && Function != FUNCTION_POWER_SAVE)
-	{
-		BK4819_Conditional_RX_TurnOn_and_GPIO6_Enable();
-		gRxIdleMode = false;
-		UI_DisplayStatus();
-	}
-
-	switch (Function)
-	{
-		case FUNCTION_FOREGROUND:
 #ifdef ENABLE_DTMF_CALLING
 	if (gDTMF_ReplyState != DTMF_REPLY_NONE)
 		RADIO_PrepareCssTX();
 #endif
-			if (PreviousFunction == FUNCTION_TRANSMIT)
-			{
+	if (PreviousFunction == FUNCTION_TRANSMIT) {
 		ST7565_FixInterfGlitch();
 		gVFO_RSSI_bar_level[0] = 0;
 		gVFO_RSSI_bar_level[1] = 0;
+	} else if (PreviousFunction != FUNCTION_RECEIVE) {
+		return;
 	}
-			else
-			if (PreviousFunction != FUNCTION_RECEIVE)
-				break;
 
 #if defined(ENABLE_FMRADIO)
 	if (gFmRadioMode)
@@ -137,17 +120,9 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 	}
 #endif
 	gUpdateStatus = true;
-			return;
+}
 
-		case FUNCTION_MONITOR:
-			gMonitor = true;
-			break;
-
-		case FUNCTION_INCOMING:
-		case FUNCTION_RECEIVE:
-			break;
-
-		case FUNCTION_POWER_SAVE:
+void FUNCTION_PowerSave() {
 	gPowerSave_10ms = gEeprom.BATTERY_SAVE * 10;
 	gPowerSaveCountdownExpired = false;
 
@@ -164,11 +139,10 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 
 	if (gScreenToDisplay != DISPLAY_MENU)     // 1of11 .. don't close the menu
 		GUI_SelectNextDisplay(DISPLAY_MAIN);
+}
 
-			return;
-
-		case FUNCTION_TRANSMIT:
-
+void FUNCTION_Transmit()
+{
 	// if DTMF is enabled when TX'ing, it changes the TX audio filtering !! .. 1of11
 	BK4819_DisableDTMF();
 
@@ -206,7 +180,7 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 		BK4819_ExitTxMute();
 
 		gAlarmToneCounter = 0;
-				break;
+		return;
 	}
 #endif
 
@@ -242,7 +216,7 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 		AUDIO_AudioPathOn();
 		gEnableSpeaker = true;
 
-				break;
+		return;
 	}
 #endif
 
@@ -254,9 +228,44 @@ void FUNCTION_Select(FUNCTION_Type_t Function)
 	if (gSetting_backlight_on_tx_rx & BACKLIGHT_ON_TR_TX) {
 		BACKLIGHT_TurnOn();
 	}
+}
 
+
+
+void FUNCTION_Select(FUNCTION_Type_t Function)
+{
+	const FUNCTION_Type_t PreviousFunction = gCurrentFunction;
+	const bool bWasPowerSave = PreviousFunction == FUNCTION_POWER_SAVE;
+
+	gCurrentFunction = Function;
+
+	if (bWasPowerSave && Function != FUNCTION_POWER_SAVE)
+	{
+		BK4819_Conditional_RX_TurnOn_and_GPIO6_Enable();
+		gRxIdleMode = false;
+		UI_DisplayStatus();
+	}
+
+	switch (Function)
+	{
+		case FUNCTION_FOREGROUND:
+			FUNCTION_Foreground(PreviousFunction);
+			return;
+
+		case FUNCTION_POWER_SAVE:
+			FUNCTION_PowerSave();
+			return;
+
+		case FUNCTION_TRANSMIT:
+			FUNCTION_Transmit();
 			break;
 
+		case FUNCTION_MONITOR:
+			gMonitor = true;
+			break;
+
+		case FUNCTION_INCOMING:
+		case FUNCTION_RECEIVE:
 		case FUNCTION_BAND_SCOPE:
 			break;
 	}

ui/ui.c

@@ -14,6 +14,7 @@
  *     limitations under the License.
  */
 
+#include <assert.h>
 #include <string.h>
 
 #include "app/chFrScanner.h"
@@ -34,6 +35,7 @@
 #include "ui/menu.h"
 #include "ui/scanner.h"
 #include "ui/ui.h"
+#include "../misc.h"
 
 GUI_DisplayType_t gScreenToDisplay;
 GUI_DisplayType_t gRequestDisplayScreen = DISPLAY_INVALID;
@@ -42,36 +44,27 @@ uint8_t           gAskForConfirmation;
 bool              gAskToSave;
 bool              gAskToDelete;
 
-void GUI_DisplayScreen(void)
-{
-	switch (gScreenToDisplay)
-	{
-		case DISPLAY_MAIN:
-			UI_DisplayMain();
-			break;
+
+void (*UI_DisplayFunctions[])(void) = {
+	[DISPLAY_MAIN] = &UI_DisplayMain,
+	[DISPLAY_MENU] = &UI_DisplayMenu,
+	[DISPLAY_SCANNER] = &UI_DisplayScanner,
 
 #ifdef ENABLE_FMRADIO
-			case DISPLAY_FM:
-				UI_DisplayFM();
-				break;
+	[DISPLAY_FM] = &UI_DisplayFM,
 #endif
 
-		case DISPLAY_MENU:
-			UI_DisplayMenu();
-			break;
-
-		case DISPLAY_SCANNER:
-			UI_DisplayScanner();
-			break;
-
 #ifdef ENABLE_AIRCOPY
-			case DISPLAY_AIRCOPY:
-				UI_DisplayAircopy();
-				break;
+	[DISPLAY_AIRCOPY] = &UI_DisplayAircopy,
 #endif
+};
 
-		default:
-			break;
+static_assert(ARRAY_SIZE(UI_DisplayFunctions) == DISPLAY_N_ELEM);
+
+void GUI_DisplayScreen(void)
+{
+	if (gScreenToDisplay != DISPLAY_INVALID) {
+		UI_DisplayFunctions[gScreenToDisplay]();
 	}
 }
 

ui/ui.h

@@ -23,10 +23,18 @@
 enum GUI_DisplayType_t
 {
 	DISPLAY_MAIN = 0,
-	DISPLAY_FM,
 	DISPLAY_MENU,
 	DISPLAY_SCANNER,
+
+#ifdef ENABLE_FMRADIO
+	DISPLAY_FM,
+#endif
+
+#ifdef ENABLE_AIRCOPY
 	DISPLAY_AIRCOPY,
+#endif
+
+	DISPLAY_N_ELEM,
 	DISPLAY_INVALID = 0xFFu
 };