lay base for SD shit

src/DSi_SD.cpp

@@ -0,0 +1,72 @@
+/*
+    Copyright 2016-2019 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include "DSi.h"
+#include "DSi_SD.h"
+
+
+DSi_SD::DSi_SD(u32 num)
+{
+    Num = num;
+}
+
+DSi_SD::~DSi_SD()
+{
+    //
+}
+
+void DSi_SD::Reset()
+{
+    if (Num == 0)
+    {
+        PortSelect = 0x0200; // CHECKME
+    }
+    else
+    {
+        PortSelect = 0x0100; // CHECKME
+    }
+}
+
+void DSi_SD::DoSavestate(Savestate* file)
+{
+    // TODO!
+}
+
+
+u16 DSi_SD::Read(u32 addr)
+{
+    switch (addr & 0x1FF)
+    {
+    case 0x002: return PortSelect & 0x030F;
+    }
+
+    printf("unknown %s read %08X\n", Num?"SDIO":"SD/MMC", addr);
+    return 0;
+}
+
+void DSi_SD::Write(u32 addr, u16 val)
+{
+    switch (addr & 0x1FF)
+    {
+    case 0x002: PortSelect = val; return;
+    }
+
+    printf("unknown %s write %08X %04X\n", Num?"SDIO":"SD/MMC", addr, val);
+}