Optimize RAM usage by making lookup tables const

App/app/action.c

@@ -61,7 +61,7 @@ inline static void ACTION_1750() { ACTION_AlarmOr1750(true); };
 
 inline static void ACTION_ScanRestart() { ACTION_Scan(true); };
 
-void (*action_opt_table[])(void) = {
+void (*const action_opt_table[])(void) = {
     [ACTION_OPT_NONE] = &FUNCTION_NOP,
     [ACTION_OPT_POWER] = &ACTION_Power,
     [ACTION_OPT_MONITOR] = &ACTION_Monitor,

App/app/app.c

@@ -107,7 +107,7 @@ static KEY_Code_t gScreenSaverWakeKey = KEY_INVALID;
 static void ProcessKey(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld);
 
 
-void (*ProcessKeysFunctions[])(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld) = {
+void (*const ProcessKeysFunctions[])(KEY_Code_t Key, bool bKeyPressed, bool bKeyHeld) = {
     [DISPLAY_MAIN] = &MAIN_ProcessKeys,
     [DISPLAY_MENU] = &MENU_ProcessKeys,
     [DISPLAY_SCANNER] = &SCANNER_ProcessKeys,

App/app/spectrum.c

@@ -73,7 +73,7 @@ static uint16_t blacklistFreqs[15];
 static uint8_t blacklistFreqsIdx;
 #endif
 
-const char *bwOptions[] = {"25", "12.5", "6.25"};
+const char *const bwOptions[] = {"25", "12.5", "6.25"};
 const uint8_t modulationTypeTuneSteps[] = {100, 50, 10};
 const uint8_t modTypeReg47Values[] = {1, 7, 5};
 
@@ -176,7 +176,7 @@ char freqInputString[11];
 uint8_t menuState = 0;
 uint16_t listenT = 0;
 
-RegisterSpec registerSpecs[] = {
+const RegisterSpec registerSpecs[] = {
     {},
     {"LNAs", BK4819_REG_13, 8, 0b11, 1},
     {"LNA", BK4819_REG_13, 5, 0b111, 1},

App/driver/st7565.c

@@ -260,7 +260,7 @@ void ST7565_FillScreen(uint8_t value)
 // D=0, display OFF
 #define ST7565_CMD_DISPLAY_ON_OFF 0xAE 
 
-uint8_t cmds[] = {
+const uint8_t cmds[] = {
     ST7565_CMD_BIAS_SELECT | 0,             // Select bias setting: 1/9
     ST7565_CMD_COM_DIRECTION  | (0 << 3),   // Set output direction of COM: normal
     ST7565_CMD_SEG_DIRECTION | 1,           // Set scan direction of SEG: reverse

App/ui/main.c

@@ -140,7 +140,7 @@ static void UI_MAIN_DrawBeamLine(void)
 }
 #endif
 
-const char *VfoStateStr[] = {
+const char *const VfoStateStr[] = {
        [VFO_STATE_NORMAL]="",
        [VFO_STATE_BUSY]="BUSY",
        [VFO_STATE_BAT_LOW]="BAT LOW",

App/ui/ui.c

@@ -48,7 +48,7 @@ bool              gAskToSave;
 bool              gAskToDelete;
 
 
-void (*UI_DisplayFunctions[])(void) = {
+void (*const UI_DisplayFunctions[])(void) = {
     [DISPLAY_MAIN] = &UI_DisplayMain,
     [DISPLAY_MENU] = &UI_DisplayMenu,
     [DISPLAY_SCANNER] = &UI_DisplayScanner,