Run 3DS detection code and show Reboot option in DS mode

arm7/source/main.c

@@ -37,11 +37,20 @@
 void my_installSystemFIFO(void);
 void my_sdmmc_get_cid(int devicenumber, u32 *cid);
 
+u8 my_i2cReadRegister(u8 device, u8 reg);
+u8 my_i2cWriteRegister(u8 device, u8 reg, u8 data);
+
 //---------------------------------------------------------------------------------
 void ReturntoDSiMenu() {
 //---------------------------------------------------------------------------------
-	i2cWriteRegister(0x4A, 0x70, 0x01);		// Bootflag = Warmboot/SkipHealthSafety
-	i2cWriteRegister(0x4A, 0x11, 0x01);		// Reset to DSi Menu
+	if (isDSiMode()) {
+		i2cWriteRegister(0x4A, 0x70, 0x01);		// Bootflag = Warmboot/SkipHealthSafety
+		i2cWriteRegister(0x4A, 0x11, 0x01);		// Reset to DSi Menu
+	} else {
+		u8 readCommand = readPowerManagement(0x10);
+		readCommand |= BIT(0);
+		writePowerManagement(0x10, readCommand);
+	}
 }
 
 //---------------------------------------------------------------------------------
@@ -128,11 +137,11 @@ int main() {
 	setPowerButtonCB(powerButtonCB);
 
 	// Check for 3DS
-	if(isDSiMode()) {
-		u8 byteBak = i2cReadRegister(0x4A, 0x71);
-		i2cWriteRegister(0x4A, 0x71, 0xD2);
-		fifoSendValue32(FIFO_USER_05, i2cReadRegister(0x4A, 0x71));
-		i2cWriteRegister(0x4A, 0x71, byteBak);
+	if(isDSiMode() || REG_SCFG_EXT != 0) {
+		u8 byteBak = my_i2cReadRegister(0x4A, 0x71);
+		my_i2cWriteRegister(0x4A, 0x71, 0xD2);
+		fifoSendValue32(FIFO_USER_05, my_i2cReadRegister(0x4A, 0x71));
+		my_i2cWriteRegister(0x4A, 0x71, byteBak);
 	}
 
 	if (isDSiMode() /*|| ((REG_SCFG_EXT & BIT(17)) && (REG_SCFG_EXT & BIT(18)))*/) {

arm7/source/my_i2c.c

@@ -0,0 +1,132 @@
+/*---------------------------------------------------------------------------------
+
+	I2C control for the ARM7
+
+	Copyright (C) 2011
+		Dave Murphy (WinterMute)
+
+	This software is provided 'as-is', without any express or implied
+	warranty.  In no event will the authors be held liable for any
+	damages arising from the use of this software.
+
+	Permission is granted to anyone to use this software for any
+	purpose, including commercial applications, and to alter it and
+	redistribute it freely, subject to the following restrictions:
+
+	1.	The origin of this software must not be misrepresented; you
+		must not claim that you wrote the original software. If you use
+		this software in a product, an acknowledgment in the product
+		documentation would be appreciated but is not required.
+	2.	Altered source versions must be plainly marked as such, and
+		must not be misrepresented as being the original software.
+	3.	This notice may not be removed or altered from any source
+		distribution.
+
+---------------------------------------------------------------------------------*/
+
+#include <nds/arm7/i2c.h>
+#include <nds/bios.h>
+
+static u32 i2cCurrentDelay = 0;
+
+//---------------------------------------------------------------------------------
+void my_i2cDelay() {
+//---------------------------------------------------------------------------------
+	i2cWaitBusy();
+	swiDelay(i2cCurrentDelay);
+}
+
+//---------------------------------------------------------------------------------
+void my_i2cStop(u8 arg0) {
+//---------------------------------------------------------------------------------
+	if(i2cCurrentDelay) {
+		REG_I2CCNT = (arg0 << 5) | 0xC0;
+		my_i2cDelay();
+		REG_I2CCNT = 0xC5;
+	} else REG_I2CCNT = (arg0 << 5) | 0xC1;
+}
+
+
+//---------------------------------------------------------------------------------
+u8 my_i2cGetResult() {
+//---------------------------------------------------------------------------------
+	i2cWaitBusy();
+	return (REG_I2CCNT >> 4) & 0x01;
+}
+
+//---------------------------------------------------------------------------------
+u8 my_i2cGetData() {
+//---------------------------------------------------------------------------------
+	i2cWaitBusy();
+	return REG_I2CDATA;
+}
+
+//---------------------------------------------------------------------------------
+void my_i2cSetDelay(u8 device) {
+//---------------------------------------------------------------------------------
+	if (device == I2C_PM ) {
+		i2cCurrentDelay = 0x180;
+	} else {
+		i2cCurrentDelay = 0;
+	}
+}
+
+//---------------------------------------------------------------------------------
+u8 my_i2cSelectDevice(u8 device) {
+//---------------------------------------------------------------------------------
+	i2cWaitBusy();
+	REG_I2CDATA = device;
+	REG_I2CCNT = 0xC2;
+	return my_i2cGetResult();
+}
+
+//---------------------------------------------------------------------------------
+u8 my_i2cSelectRegister(u8 reg) {
+//---------------------------------------------------------------------------------
+	my_i2cDelay();
+	REG_I2CDATA = reg;
+	REG_I2CCNT = 0xC0;
+	return my_i2cGetResult();
+}
+
+//---------------------------------------------------------------------------------
+u8 my_i2cWriteRegister(u8 device, u8 reg, u8 data) {
+//---------------------------------------------------------------------------------
+	my_i2cSetDelay(device);
+	int i;
+
+	for(i = 0; i < 8; i++) {
+		if((my_i2cSelectDevice(device) != 0) && (my_i2cSelectRegister(reg) != 0)) {
+			my_i2cDelay();
+			REG_I2CDATA = data;
+			my_i2cStop(0);
+			if(my_i2cGetResult() != 0) return 1;
+        }
+		REG_I2CCNT = 0xC5;
+    }
+
+    return 0;
+}
+
+//---------------------------------------------------------------------------------
+u8 my_i2cReadRegister(u8 device, u8 reg) {
+//---------------------------------------------------------------------------------
+	my_i2cSetDelay(device);
+	int i;
+
+	for(i = 0; i < 8; i++) {
+		
+		if((my_i2cSelectDevice(device) != 0) && (my_i2cSelectRegister(reg) != 0)) {
+			my_i2cDelay();
+			if(my_i2cSelectDevice(device | 1)) {
+				my_i2cDelay();
+				my_i2cStop(1);
+				return my_i2cGetData();
+			}
+		}
+
+		REG_I2CCNT = 0xC5;
+	}
+
+	return 0xff;
+}

arm9/source/main.cpp

@@ -175,6 +175,9 @@ int main(int argc, char **argv) {
 		*(vu32*)(0x0DFFFE0C) = 0x474D3969;		// Check for 32MB of RAM
 		bool ram32MB = *(vu32*)(0x0DFFFE0C) == 0x474D3969;
 		ramdriveMount(ram32MB);
+		if (ram32MB) {
+			is3DS = fifoGetValue32(FIFO_USER_05) != 0xD2;
+		}
 	} else if (isRegularDS && (io_dldi_data->ioInterface.features & FEATURE_SLOT_NDS)) {
 		ramdriveMount(false);
 	}

arm9/source/startMenu.cpp

@@ -40,7 +40,7 @@ constexpr std::array<std::pair<const char *, const char *>, 10> languageList = {
 
 void startMenu() {
 	std::vector<StartMenuItem> startMenuItems;
-	if(isDSiMode()) {
+	if(!isRegularDS) {
 		startMenuItems = {
 			StartMenuItem::powerOff,
 			StartMenuItem::reboot,