Initial commit

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

Makefile

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+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+TOPDIR ?= $(CURDIR)
+include $(DEVKITARM)/3ds_rules
+
+#---------------------------------------------------------------------------------
+# TARGET is the name of the output
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# DATA is a list of directories containing data files
+# INCLUDES is a list of directories containing header files
+#
+# NO_SMDH: if set to anything, no SMDH file is generated.
+# ROMFS is the directory which contains the RomFS, relative to the Makefile (Optional)
+# APP_TITLE is the name of the app stored in the SMDH file (Optional)
+# APP_DESCRIPTION is the description of the app stored in the SMDH file (Optional)
+# APP_AUTHOR is the author of the app stored in the SMDH file (Optional)
+# ICON is the filename of the icon (.png), relative to the project folder.
+#   If not set, it attempts to use one of the following (in this order):
+#     - <Project name>.png
+#     - icon.png
+#     - <libctru folder>/default_icon.png
+#---------------------------------------------------------------------------------
+TARGET		:=	$(notdir $(CURDIR))
+BUILD		:=	build
+SOURCES		:=	source
+DATA		:=	data
+INCLUDES	:=	include
+APP_TITLE	:=  Power Off Cartridge Slot
+APP_DESCRIPTION	:= Dis- and enables the cartridge slot
+APP_AUTHOR	:= Brawl
+#ROMFS		:=	romfs
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH	:=	-march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft
+
+CFLAGS	:=	-g -Wall -O2 -mword-relocations \
+			-fomit-frame-pointer -ffunction-sections \
+			$(ARCH)
+
+CFLAGS	+=	$(INCLUDE) -DARM11 -D_3DS
+
+CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11
+
+ASFLAGS	:=	-g $(ARCH)
+LDFLAGS	=	-specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
+
+LIBS	:= -lctru -lm
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS	:= $(CTRULIB)
+
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export TOPDIR	:=	$(CURDIR)
+
+export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
+			$(foreach dir,$(DATA),$(CURDIR)/$(dir))
+
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+PICAFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.v.pica)))
+SHLISTFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.shlist)))
+BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+	export LD	:=	$(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES_SOURCES 	:=	$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export OFILES_BIN	:=	$(addsuffix .o,$(BINFILES)) \
+			$(PICAFILES:.v.pica=.shbin.o) $(SHLISTFILES:.shlist=.shbin.o)
+
+export OFILES := $(OFILES_BIN) $(OFILES_SOURCES)
+
+export HFILES	:=	$(PICAFILES:.v.pica=_shbin.h) $(SHLISTFILES:.shlist=_shbin.h) $(addsuffix .h,$(subst .,_,$(BINFILES)))
+
+export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
+			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
+			-I$(CURDIR)/$(BUILD)
+
+export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+ifeq ($(strip $(ICON)),)
+	icons := $(wildcard *.png)
+	ifneq (,$(findstring $(TARGET).png,$(icons)))
+		export APP_ICON := $(TOPDIR)/$(TARGET).png
+	else
+		ifneq (,$(findstring icon.png,$(icons)))
+			export APP_ICON := $(TOPDIR)/icon.png
+		endif
+	endif
+else
+	export APP_ICON := $(TOPDIR)/$(ICON)
+endif
+
+ifeq ($(strip $(NO_SMDH)),)
+	export _3DSXFLAGS += --smdh=$(CURDIR)/$(TARGET).smdh
+endif
+
+ifneq ($(ROMFS),)
+	export _3DSXFLAGS += --romfs=$(CURDIR)/$(ROMFS)
+endif
+
+.PHONY: $(BUILD) clean all
+
+#---------------------------------------------------------------------------------
+all: $(BUILD)
+
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(TARGET).3dsx $(OUTPUT).smdh $(TARGET).elf
+
+
+#---------------------------------------------------------------------------------
+else
+
+DEPENDS	:=	$(OFILES:.o=.d)
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(NO_SMDH)),)
+$(OUTPUT).3dsx	:	$(OUTPUT).elf $(OUTPUT).smdh
+else
+$(OUTPUT).3dsx	:	$(OUTPUT).elf
+endif
+
+$(OFILES_SOURCES) : $(HFILES)
+
+$(OUTPUT).elf	:	$(OFILES)
+
+#---------------------------------------------------------------------------------
+# you need a rule like this for each extension you use as binary data
+#---------------------------------------------------------------------------------
+%.bin.o	%_bin.h :	%.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+#---------------------------------------------------------------------------------
+# rules for assembling GPU shaders
+#---------------------------------------------------------------------------------
+define shader-as
+	$(eval CURBIN := $*.shbin)
+	$(eval DEPSFILE := $(DEPSDIR)/$*.shbin.d)
+	echo "$(CURBIN).o: $< $1" > $(DEPSFILE)
+	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(CURBIN) | tr . _)`.h
+	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(CURBIN) | tr . _)`.h
+	echo "extern const u32" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(CURBIN) | tr . _)`.h
+	picasso -o $(CURBIN) $1
+	bin2s $(CURBIN) | $(AS) -o $*.shbin.o
+endef
+
+%.shbin.o %_shbin.h : %.v.pica %.g.pica
+	@echo $(notdir $^)
+	@$(call shader-as,$^)
+
+%.shbin.o %_shbin.h : %.v.pica
+	@echo $(notdir $<)
+	@$(call shader-as,$<)
+
+%.shbin.o %_shbin.h : %.shlist
+	@echo $(notdir $<)
+	@$(call shader-as,$(foreach file,$(shell cat $<),$(dir $<)$(file)))
+
+
+-include $(DEPENDS)
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

README.md

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+3DS Power Off Cartridge Slot
+============================
+This 3DS homebrew **powers off the 3DS cartridge slot** and can enable it again. This **does not survive a reboot** and the cartridge slot gets **re-enabled when you re-insert a cartridge**. Please make sure to run this **with a Custom Firmware**. Useful for flashcard users!
+
+![Screenshot](screenshot1.bmp?raw=true)
+
+![Screenshot](screenshot2.bmp?raw=true)

source/main.c

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+#include <stdio.h>
+#include <string.h>
+#include <3ds.h>
+
+// Get current Cartridge Slot status
+bool get_slot_status() {
+    bool status;
+    FSUSER_CardSlotGetCardIFPowerStatus(&status);
+    return status;
+}
+
+// Switch cartridge slot status
+void switch_slot_status(bool status) {
+    bool newstatus;
+    if (status) {
+        FSUSER_CardSlotPowerOff(&newstatus);
+    } else {
+        FSUSER_CardSlotPowerOn(&newstatus);
+    }
+    // Doesn't seem to return the new power status correctly?
+}
+
+int main(int argc, char** argv)
+{
+    // Initialize services
+    gfxInitDefault();
+    fsInit();
+  
+    // Init console for text output
+    consoleInit(GFX_TOP, NULL);
+    consoleClear();
+    
+    // Begin Code here
+    printf(CONSOLE_GREEN "3DS Power Off Cartridge Slot" CONSOLE_RESET "\n");
+    printf("Press A to switch cartridge status.\n");
+    printf("Press START to exit.\n");
+    
+    bool status = get_slot_status();
+
+    // Main loop
+    while (aptMainLoop())
+    {
+        printf("\x1b[5;0H");
+        if (status) {
+            printf("Cartridge Slot is:" CONSOLE_BLUE " ENABLED " CONSOLE_RESET "\n");
+        } else {
+            printf("Cartridge Slot is:" CONSOLE_RED " DISABLED" CONSOLE_RESET "\n");
+        }
+        
+        hidScanInput();
+        u32 kDown = hidKeysDown();
+        
+        if (kDown & KEY_START) {
+            break; // break in order to return to hbmenu
+        }
+        
+        if (kDown & KEY_A) {
+            switch_slot_status(status);
+            status = get_slot_status();
+        }
+
+        // Flush and swap framebuffers
+        gfxFlushBuffers();
+        gfxSwapBuffers();
+        gspWaitForVBlank();
+    }
+
+    // Exit services
+    fsExit();
+    gfxExit();
+    return 0;
+}