lay base for DSi-mode TSC

src/DSi_SPI_TSC.cpp

@@ -0,0 +1,113 @@
+/*
+    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_SPI_TSC.h"
+
+
+namespace DSi_SPI_TSC
+{
+
+u32 DataPos;
+u8 Index;
+u8 Mode;
+u8 Data;
+
+u16 TouchX, TouchY;
+
+
+bool Init()
+{
+    return true;
+}
+
+void DeInit()
+{
+}
+
+void Reset()
+{
+    DataPos = 0;
+
+    Mode = 0;
+    Index = 0;
+    Data = 0;
+}
+
+void DoSavestate(Savestate* file)
+{
+    /*file->Section("SPTi");
+
+    file->Var32(&DataPos);
+    file->Var8(&ControlByte);
+    file->Var8(&Data);
+
+    file->Var16(&ConvResult);*/
+    // TODO!!
+}
+
+void SetTouchCoords(u16 x, u16 y)
+{
+    TouchX = x;
+    TouchY = y;
+
+    if (y == 0xFFF) return;
+
+    TouchX <<= 4;
+    TouchY <<= 4;
+}
+
+void MicInputFrame(s16* data, int samples)
+{
+    // TODO: forward to DS-mode TSC if needed
+}
+
+u8 Read()
+{
+    return Data;
+}
+
+void Write(u8 val, u32 hold)
+{
+#define READWRITE(var) { if (Index & 0x01) Data = var; else var = val; }
+printf("TSC: %02X %d\n", val, hold?1:0);
+    if (DataPos == 0)
+    {
+        Index = val;
+    }
+    else
+    {
+        if ((Index & 0xFE) == 0)
+        {
+            READWRITE(Mode);
+        }
+        else
+        {
+            printf("DSi_SPI_TSC: unknown IO, mode=%02X, index=%02X (%02X %s)\n", Mode, Index, Index>>1, (Index&1)?"read":"write");
+        }
+
+        Index += (1<<1); // increment index
+    }
+
+    if (hold) DataPos++;
+    else      DataPos = 0;
+}
+
+}