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/*
Copyright 2016-2021 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_I2C.h"
#include "DSi_Camera.h"
#include "ARM.h"
namespace DSi_BPTWL
{
u8 Registers[0x100];
u32 CurPos;
bool Init()
{
return true;
}
void DeInit()
{
}
void Reset()
{
CurPos = -1;
memset(Registers, 0x5A, 0x100);
Registers[0x00] = 0x33; // TODO: support others??
Registers[0x01] = 0x00;
Registers[0x02] = 0x50;
Registers[0x10] = 0x00; // power btn
Registers[0x11] = 0x00; // reset
Registers[0x12] = 0x00; // power btn tap
Registers[0x20] = 0x8F; // battery
Registers[0x21] = 0x07;
Registers[0x30] = 0x13;
Registers[0x31] = 0x00; // camera power
Registers[0x40] = 0x1F; // volume
Registers[0x41] = 0x04; // backlight
Registers[0x60] = 0x00;
Registers[0x61] = 0x01;
Registers[0x62] = 0x50;
Registers[0x63] = 0x00;
Registers[0x70] = 0x00; // boot flag
Registers[0x71] = 0x00;
Registers[0x72] = 0x00;
Registers[0x73] = 0x00;
Registers[0x74] = 0x00;
Registers[0x75] = 0x00;
Registers[0x76] = 0x00;
Registers[0x77] = 0x00;
Registers[0x80] = 0x10;
Registers[0x81] = 0x64;
}
u8 GetBootFlag() { return Registers[0x70]; }
void Start()
{
//printf("BPTWL: start\n");
}
u8 Read(bool last)
{
//printf("BPTWL: read %02X -> %02X @ %08X\n", CurPos, Registers[CurPos], NDS::GetPC(1));
u8 ret = Registers[CurPos++];
if (last)
{
CurPos = -1;
}
return ret;
}
void Write(u8 val, bool last)
{
if (last)
{
CurPos = -1;
return;
}
if (CurPos == 0xFFFFFFFF)
{
CurPos = val;
//printf("BPTWL: reg=%02X\n", val);
return;
}
if (CurPos == 0x11 && val == 0x01)
{
printf("BPTWL: soft-reset\n");
val = 0; // checkme
// TODO: soft-reset might need to be scheduled later!
// TODO: this has been moved for the JIT to work, nothing is confirmed here
NDS::ARM7->Halt(4);
CurPos = -1;
return;
}
if (CurPos == 0x11 || CurPos == 0x12 ||
CurPos == 0x21 ||
CurPos == 0x30 || CurPos == 0x31 ||
CurPos == 0x40 || CurPos == 0x31 ||
CurPos == 0x60 || CurPos == 0x63 ||
(CurPos >= 0x70 && CurPos <= 0x77) ||
CurPos == 0x80 || CurPos == 0x81)
{
Registers[CurPos] = val;
}
//printf("BPTWL: write %02X -> %02X\n", CurPos, val);
CurPos++; // CHECKME
}
}
namespace DSi_I2C
{
u8 Cnt;
u8 Data;
u32 Device;
bool Init()
{
if (!DSi_BPTWL::Init()) return false;
if (!DSi_Camera::Init()) return false;
return true;
}
void DeInit()
{
DSi_BPTWL::DeInit();
DSi_Camera::DeInit();
}
void Reset()
{
Cnt = 0;
Data = 0;
Device = -1;
DSi_BPTWL::Reset();
DSi_Camera::Reset();
}
void WriteCnt(u8 val)
{
//printf("I2C: write CNT %02X, %08X\n", val, NDS::GetPC(1));
// TODO: check ACK flag
// TODO: transfer delay
// TODO: IRQ
// TODO: check read/write direction
if (val & (1<<7))
{
bool islast = val & (1<<0);
if (val & (1<<5))
{
// read
val &= 0xF7;
switch (Device)
{
case 0x4A: Data = DSi_BPTWL::Read(islast); break;
case 0x78: Data = DSi_Camera0->I2C_Read(islast); break;
case 0x7A: Data = DSi_Camera1->I2C_Read(islast); break;
case 0xA0:
case 0xE0: Data = 0xFF; break;
default:
printf("I2C: read on unknown device %02X, cnt=%02X, data=%02X, last=%d\n", Device, val, 0, islast);
Data = 0xFF;
break;
}
//printf("I2C read, device=%02X, cnt=%02X, data=%02X, last=%d\n", Device, val, Data, islast);
}
else
{
// write
val &= 0xE7;
bool ack = true;
if (val & (1<<1))
{
Device = Data & 0xFE;
//printf("I2C: %s start, device=%02X\n", (Data&0x01)?"read":"write", Device);
switch (Device)
{
case 0x4A: DSi_BPTWL::Start(); break;
case 0x78: DSi_Camera0->I2C_Start(); break;
case 0x7A: DSi_Camera1->I2C_Start(); break;
case 0xA0:
case 0xE0: ack = false; break;
default:
printf("I2C: %s start on unknown device %02X\n", (Data&0x01)?"read":"write", Device);
ack = false;
break;
}
}
else
{
//printf("I2C write, device=%02X, cnt=%02X, data=%02X, last=%d\n", Device, val, Data, islast);
switch (Device)
{
case 0x4A: DSi_BPTWL::Write(Data, islast); break;
case 0x78: DSi_Camera0->I2C_Write(Data, islast); break;
case 0x7A: DSi_Camera1->I2C_Write(Data, islast); break;
case 0xA0:
case 0xE0: ack = false; break;
default:
printf("I2C: write on unknown device %02X, cnt=%02X, data=%02X, last=%d\n", Device, val, Data, islast);
ack = false;
break;
}
}
if (ack) val |= (1<<4);
}
val &= 0x7F;
}
Cnt = val;
}
u8 ReadData()
{
return Data;
}
void WriteData(u8 val)
{
Data = val;
}
}
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