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/*
Copyright 2016-2023 melonDS team
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"
#include "Platform.h"
using Platform::Log;
using Platform::LogLevel;
DSi_TSC::DSi_TSC(SPIHost* host) : TSC(host)
{
}
DSi_TSC::~DSi_TSC()
{
}
void DSi_TSC::Reset()
{
TSC::Reset();
DataPos = 0;
Bank = 0;
Index = 0;
Data = 0;
memset(Bank3Regs, 0, 0x80);
Bank3Regs[0x02] = 0x18;
Bank3Regs[0x03] = 0x87;
Bank3Regs[0x04] = 0x22;
Bank3Regs[0x05] = 0x04;
Bank3Regs[0x06] = 0x20;
Bank3Regs[0x09] = 0x40;
Bank3Regs[0x0E] = 0xAD;
Bank3Regs[0x0F] = 0xA0;
Bank3Regs[0x10] = 0x88;
Bank3Regs[0x11] = 0x81;
TSCMode = 0x01; // DSi mode
}
void DSi_TSC::DoSavestate(Savestate* file)
{
TSC::DoSavestate(file);
file->Section("SPTi");
file->Var32(&DataPos);
file->Var8(&Index);
file->Var8(&Bank);
file->Var8(&Data);
file->VarArray(Bank3Regs, 0x80);
file->Var8(&TSCMode);
}
void DSi_TSC::SetMode(u8 mode)
{
TSCMode = mode;
}
void DSi_TSC::SetTouchCoords(u16 x, u16 y)
{
if (TSCMode == 0x00) return TSC::SetTouchCoords(x, y);
TouchX = x;
TouchY = y;
u8 oldpress = Bank3Regs[0x0E] & 0x01;
if (y == 0xFFF)
{
// released
// TODO: GBAtek says it can also be 1000 or 3000??
TouchX = 0x7000;
TouchY = 0x7000;
Bank3Regs[0x09] = 0x40;
//Bank3Regs[0x09] &= ~0x80;
Bank3Regs[0x0E] |= 0x01;
}
else
{
// pressed
TouchX <<= 4;
TouchY <<= 4;
Bank3Regs[0x09] = 0x80;
//Bank3Regs[0x09] |= 0x80;
Bank3Regs[0x0E] &= ~0x01;
}
if (oldpress ^ (Bank3Regs[0x0E] & 0x01))
{
TouchX |= 0x8000;
TouchY |= 0x8000;
}
}
void DSi_TSC::MicInputFrame(s16* data, int samples)
{
if (TSCMode == 0x00) return TSC::MicInputFrame(data, samples);
// otherwise we don't handle mic input
// TODO: handle it where it needs to be
}
void DSi_TSC::Write(u8 val)
{
if (TSCMode == 0x00) return TSC::Write(val);
#define READWRITE(var) { if (Index & 0x01) Data = var; else var = val; }
if (DataPos == 0)
{
Index = val;
}
else
{
u8 id = Index >> 1;
if (id == 0)
{
READWRITE(Bank);
}
else if (Bank == 0x03)
{
if (Index & 0x01) Data = Bank3Regs[id];
else
{
if (id == 0x0D || id == 0x0E)
Bank3Regs[id] = (Bank3Regs[id] & 0x03) | (val & 0xFC);
}
}
else if ((Bank == 0xFC) && (Index & 0x01))
{
if (id < 0x0B)
{
// X coordinates
if (id & 0x01) Data = TouchX >> 8;
else Data = TouchX & 0xFF;
TouchX &= 0x7FFF;
}
else if (id < 0x15)
{
// Y coordinates
if (id & 0x01) Data = TouchY >> 8;
else Data = TouchY & 0xFF;
TouchY &= 0x7FFF; // checkme
}
else
{
// whatever (TODO)
Data = 0;
}
}
else if (Bank == 0xFF)
{
if (id == 0x05)
{
// TSC mode register
// 01: normal (DSi) mode
// 00: compatibility (DS) mode
if (Index & 0x01) Data = TSCMode;
else
{
TSCMode = val;
if (TSCMode == 0x00)
{
Log(LogLevel::Debug, "DSi_SPI_TSC: DS-compatibility mode\n");
DataPos = 0;
NDS::KeyInput |= (1 << (16+6));
return;
}
}
}
}
else
{
Log(LogLevel::Debug, "DSi_SPI_TSC: unknown IO, bank=%02X, index=%02X (%02X %s)\n", Bank, Index, Index>>1, (Index&1)?"read":"write");
}
Index += (1<<1); // increment index
}
DataPos++;
}
void DSi_TSC::Release()
{
if (TSCMode == 0x00) return TSC::Release();
DataPos = 0;
}
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