Add Contrast feature

ui/menu.c

@@ -129,6 +129,7 @@ const t_menu_item MenuList[] =
 	{"SetLow", VOICE_ID_INVALID,                       MENU_SET_LOW       },
 	{"SetPtt", VOICE_ID_INVALID,                       MENU_SET_PTT       },
 	{"SetTot", VOICE_ID_INVALID,                       MENU_SET_TOT       },
+	{"SetCtr", VOICE_ID_INVALID,                       MENU_SET_CTR       },
 #endif
 	// hidden menu items from here on
 	// enabled if pressing both the PTT and upper side button at power-on
@@ -899,6 +900,12 @@ void UI_DisplayMenu(void)
 		case MENU_SET_TOT:
 			strcpy(String, gSubMenu_SET_TOT[gSubMenuSelection]);
 			break;
+
+		case MENU_SET_CTR:
+			sprintf(String, "%d", gSubMenuSelection);
+			gSetting_set_ctr = gSubMenuSelection;
+			ST7565_Contrast();
+			break;
 #endif
 
 	}

ui/menu.h

@@ -123,6 +123,7 @@ enum
 	MENU_SET_LOW,
 	MENU_SET_PTT,
 	MENU_SET_TOT,
+	MENU_SET_CTR,
 #endif
 	MENU_BATCAL,  // battery voltage calibration
 	MENU_F1SHRT,

ui/welcome.c

@@ -71,6 +71,7 @@ void UI_DisplayWelcome(void)
 		UI_PrintString(WelcomeString1, 0, 127, 2, 10);
 
 #ifdef ENABLE_FEAT_F4HWN
+		ST7565_Contrast();
 		UI_PrintStringSmallNormal(Version, 0, 128, 5);
 		UI_PrintStringSmallNormal(Feat, 0, 128, 6);
 #else