public void Step(uint opCycles)
{
clockTmp += opCycles;
//1/16 cpu speed: increment main clock
if (clockTmp >= 16)
{
clockTmp -= 16;
clock++;
//1/16 Increment divider
dividerClockTmp++;
if (dividerClockTmp == 16)
{
dividerClockTmp = 0;
DIV++;
}
}
if (IsRunning)
{
//1/x Increment counter
if (clock >= (int)TimerSpeed)
{
clock = 0;
TIMA++;
if (TIMA == 0)
{
mmu.SetInterrupt(MMU.InterruptType.TimerOverflow);
TIMA = TMA;
}
}
}
}
public void SetKey(Button button, bool pressed)
{
states[button] = pressed;
byte directions = 0x00;
byte buttons = 0x00;
buttons |= (byte)(states[Button.A] ? 0x01 : 0x00);
buttons |= (byte)(states[Button.B] ? 0x02 : 0x00);
buttons |= (byte)(states[Button.Select] ? 0x04 : 0x00);
buttons |= (byte)(states[Button.Start] ? 0x08 : 0x00);
buttons = (byte)~buttons;
directions |= (byte)(states[Button.Right] ? 0x01 : 0x00);
directions |= (byte)(states[Button.Left] ? 0x02 : 0x00);
directions |= (byte)(states[Button.Up] ? 0x04 : 0x00);
directions |= (byte)(states[Button.Down] ? 0x08 : 0x00);
directions = (byte)~directions;
mmu.WriteJoypadInfo(
(byte)((buttons) & 0x0F),
(byte)((directions) & 0xF)
);
if (directions != 0x0F || buttons != 0x0F)
{
mmu.SetInterrupt(MMU.InterruptType.HighToLowP10P13);
}
}
public void Step(uint opCycles)
{
clock += opCycles;
switch (STAT_Mode)
{
//OAM Read
case GPUMode.OAMRead:
if (clock >= SCANLINE_OAM_CYCLES)
{
clock -= SCANLINE_OAM_CYCLES;
STAT_Mode = GPUMode.VRAMRead;
}
break;
//VRAM Read
case GPUMode.VRAMRead:
if (clock >= SCANLINE_VRAM_CYCLES)
{
clock -= SCANLINE_VRAM_CYCLES;
STAT_Mode = GPUMode.HBlank;
DrawScanline();
}
break;
//HBlank
case GPUMode.HBlank:
if (clock >= HORIZONAL_BLANK_CYCLES)
{
clock -= HORIZONAL_BLANK_CYCLES;
LY++;
if (LY == (SCREEN_PIXELS_HEIGHT - 1))
{
STAT_Mode = GPUMode.VBlank;
mmu.SetInterrupt(MMU.InterruptType.VBlank);
DrawScreen();
}
else
{
STAT_Mode = GPUMode.OAMRead;
}
}
break;
//VBlank
case GPUMode.VBlank:
if (clock >= VERTICAL_BLANK_CYCLES)
{
clock -= VERTICAL_BLANK_CYCLES;
LY++;
if (LY > 153)
{
STAT_Mode = GPUMode.OAMRead;
LY = 0;
}
}
break;
}
}