Press select/minus to toggle backlight

README.md

@@ -8,6 +8,9 @@ FTP Server for 3DS/Switch/Linux.
 - Supports multiple simultaneous clients. The 3DS itself only appears to support enough sockets to perform 4-5 simultaneous data transfers, so it will help if you limit your FTP client to this many parallel requests.
 - Cutting-edge graphics.
 
+- Toggle backlight on 3DS with SELECT button
+- Toggle backlight on Switch with MINUS button
+
 ## Latest Builds
 NDS: https://mtheall.com/~mtheall/ftpd.nds
 

source/3ds/platform.cpp

@@ -70,6 +70,12 @@ u32 *s_socuBuffer = nullptr;
 /// \brief ac:u fence
 platform::Mutex s_acuFence;
 
+/// \brief Whether to power backlight
+bool s_backlight = true;
+
+/// \brief APT hook cookie
+aptHookCookie s_aptHookCookie;
+
 #ifdef CLASSIC
 in_addr_t s_addr = 0;
 #else
@@ -118,6 +124,43 @@ C3D_Tex s_gfxTexture;
 Tex3DS_Texture s_gfxT3x;
 #endif
 
+/// \brief Enable backlight
+/// \param enable_ Whether to enable backligh
+void enableBacklight (bool const enable_)
+{
+	if (R_FAILED (gspLcdInit ()))
+		return;
+
+	(enable_ ? GSPLCD_PowerOnBacklight : GSPLCD_PowerOffBacklight) (GSPLCD_SCREEN_BOTH);
+
+	gspLcdExit ();
+}
+
+/// \brief Handle APT cookie
+/// \param type_ Hook type
+/// \param param_ User param
+void handleAPTHook (APT_HookType const type_, void *const param_)
+{
+	switch (type_)
+	{
+	case APTHOOK_ONSUSPEND:
+	case APTHOOK_ONSLEEP:
+		// turn on backlight, or you can't see the home menu!
+		if (!s_backlight)
+			enableBacklight (true);
+		break;
+
+	case APTHOOK_ONRESTORE:
+	case APTHOOK_ONWAKEUP:
+		// restore backlight setting
+		enableBacklight (s_backlight);
+		break;
+
+	default:
+		break;
+	}
+}
+
 /// \brief Get network visibility
 bool getNetworkVisibility ()
 {
@@ -328,6 +371,8 @@ bool platform::init ()
 	std::setvbuf (stderr, nullptr, _IOLBF, 0);
 #endif
 
+	aptHook (&s_aptHookCookie, handleAPTHook, nullptr);
+
 #ifndef CLASSIC
 	// initialize citro3d
 	C3D_Init (2 * C3D_DEFAULT_CMDBUF_SIZE);
@@ -392,9 +437,19 @@ bool platform::loop ()
 
 	hidScanInput ();
 
-	if (hidKeysDown () & KEY_START)
+	auto const kDown = hidKeysDown ();
+
+	// check if the user wants to exit
+	if (kDown & KEY_START)
 		return false;
 
+	// check if the user wants to toggle the backlight
+	if (kDown & KEY_SELECT)
+	{
+		s_backlight = !s_backlight;
+		enableBacklight (s_backlight);
+	}
+
 #ifndef CLASSIC
 	auto &io = ImGui::GetIO ();
 
@@ -455,6 +510,12 @@ void platform::exit ()
 	s_socuActive = false;
 	std::free (s_socuBuffer);
 
+	aptUnhook (&s_aptHookCookie);
+
+	// turn backlight back on
+	if (!s_backlight)
+		enableBacklight (true);
+
 	gfxExit ();
 #ifndef CLASSIC
 	romfsExit ();

source/nds/platform.cpp

@@ -40,6 +40,8 @@ PrintConsole g_sessionConsole;
 namespace
 {
 struct in_addr s_addr = {0};
+/// \brief Whether to power backlight
+bool s_backlight = true;
 }
 
 bool platform::networkVisible ()
@@ -99,9 +101,18 @@ bool platform::loop ()
 {
 	scanKeys ();
 
-	if (keysDown () & KEY_START)
+	// check if the user wants to exit
+	auto const kDown = keysDown ();
+	if (kDown & KEY_START)
 		return false;
 
+	// check if the user wants to toggle the backlight
+	if (kDown & KEY_SELECT)
+	{
+		s_backlight = !s_backlight;
+		(s_backlight ? powerOn : powerOff) (POWER_LCD);
+	}
+
 	return true;
 }
 
@@ -112,12 +123,5 @@ void platform::render ()
 
 void platform::exit ()
 {
-	info ("Press any key to exit\n");
-	render ();
-
-	do
-	{
-		swiWaitForVBlank ();
-		scanKeys ();
-	} while (!keysDown ());
+	powerOn (POWER_LCD);
 }

source/switch/platform.cpp

@@ -50,6 +50,12 @@ PrintConsole g_sessionConsole;
 
 namespace
 {
+/// \brief Whether to power backlight
+bool s_backlight = true;
+
+/// \brief Applet hook cookie
+AppletHookCookie s_appletHookCookie;
+
 #ifdef CLASSIC
 in_addr_t s_addr = 0;
 #else
@@ -397,6 +403,24 @@ void deko3dExit ()
 }
 #endif
 
+/// \brief Handle applet hook
+/// \param hook_ Callback reason
+/// \param param_ User param
+void handleAppletHook (AppletHookType const hook_, void *const param_)
+{
+	(void)param_;
+	switch (hook_)
+	{
+	case AppletHookType_OnFocusState:
+		if (appletGetFocusState () == AppletFocusState_Focused)
+			appletSetLcdBacklightOffEnabled (!s_backlight);
+		break;
+
+	default:
+		break;
+	}
+}
+
 /// \brief Draw status
 void drawStatus ()
 {
@@ -503,6 +527,8 @@ void drawStatus ()
 }
 }
 
+
+
 bool platform::init ()
 {
 #ifdef CLASSIC
@@ -534,6 +560,8 @@ bool platform::init ()
 	    FB_NUM);
 #endif
 
+	appletHook (&s_appletHookCookie, handleAppletHook, nullptr);
+
 	return true;
 }
 
@@ -561,9 +589,18 @@ bool platform::loop ()
 	hidScanInput ();
 
 	auto const keysDown = hidKeysDown (CONTROLLER_P1_AUTO);
+
+	// check if the user wants to exit
 	if (keysDown & KEY_PLUS)
 		return false;
 
+	// check if the user wants to toggle the backlight
+	if (keysDown & KEY_MINUS)
+	{
+		s_backlight = !s_backlight;
+		appletSetLcdBacklightOffEnabled (!s_backlight);
+	}
+
 #ifndef CLASSIC
 	imgui::nx::newFrame ();
 	ImGui::NewFrame ();
@@ -647,6 +684,11 @@ void platform::exit ()
 	imgui::deko3d::exit ();
 	deko3dExit ();
 #endif
+
+	appletUnhook (&s_appletHookCookie);
+
+	if (!s_backlight)
+		appletSetLcdBacklightOffEnabled (false);
 }
 
 ///////////////////////////////////////////////////////////////////////////