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GBHawk: More double speed mode work

This commit is contained in:
alyosha-tas 2020-11-21 16:18:43 -05:00
parent cd7cc7f939
commit bffe2078d4
3 changed files with 17 additions and 26 deletions
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5
src/BizHawk.Emulation.Cores/CPUs/LR35902/LR35902.cs
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@ -60,7 +60,7 @@ namespace BizHawk.Emulation.Cores.Components.LR35902
public const ushort COND_CHECK = 48; public const ushort COND_CHECK = 48;
public const ushort HALT_FUNC = 49; public const ushort HALT_FUNC = 49;
public const ushort WAIT = 50; // set cpu to wait state during HDMA public const ushort WAIT = 50; // set cpu to wait state during HDMA
public const ushort DIV_RST = 51; // change speed mode public const ushort DIV_RST = 51; // change speed mode and reset divider
// test conditions // test conditions
public const ushort ALWAYS_T = 0; public const ushort ALWAYS_T = 0;
@ -516,7 +516,6 @@ namespace BizHawk.Emulation.Cores.Components.LR35902
if (stop_time == 32770) if (stop_time == 32770)
{ {
// point to speed cange loop // point to speed cange loop
SpeedFunc(1);
instr_pntr = 256 * 60 * 2 + 60 * 9; instr_pntr = 256 * 60 * 2 + 60 * 9;
stop_time--; stop_time--;
break; break;
@ -736,7 +735,7 @@ namespace BizHawk.Emulation.Cores.Components.LR35902
instr_pntr--; instr_pntr--;
break; break;
case DIV_RST: case DIV_RST:
SpeedFunc(2); SpeedFunc(1);
break; break;
} }
TotalExecutedCycles++; TotalExecutedCycles++;

10
src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
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@ -1176,13 +1176,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
HDMA_can_start = true; HDMA_can_start = true;
read_case = 18; read_case = 18;
if (Core.double_speed)
{
STAT &= 0xFC;
STAT |= 0x00;
if (STAT.Bit(3)) { HBL_INT = true; }
// the CPU has to be able to see the transition from mode 3 to mode 0 to start HDMA
}
break; break;
case 9: case 9:
@ -1293,13 +1286,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
read_case = 8; read_case = 8;
// hbl_countdown = 1; // hbl_countdown = 1;
if (!Core.double_speed)
{
STAT &= 0xFC; STAT &= 0xFC;
STAT |= 0x00; STAT |= 0x00;
if (STAT.Bit(3)) { HBL_INT = true; } if (STAT.Bit(3)) { HBL_INT = true; }
// the CPU has to be able to see the transition from mode 3 to mode 0 to start HDMA // the CPU has to be able to see the transition from mode 3 to mode 0 to start HDMA
}
// TODO: If Window is turned on midscanline what happens? When is this check done exactly? // TODO: If Window is turned on midscanline what happens? When is this check done exactly?
if ((window_started && window_latch) || (window_is_reset && !window_latch && (LY > window_y_latch))) if ((window_started && window_latch) || (window_is_reset && !window_latch && (LY > window_y_latch)))

16
src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBHawk.IEmulator.cs
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@ -299,26 +299,28 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
return 0; return 0;
} }
else if (temp == 1) else if (temp == 1)
{
double_speed = !double_speed;
return 0;
}
else
{ {
// reset the divider (only way for speed_change_timing_fine.gbc and speed_change_cancel.gbc to both work) // reset the divider (only way for speed_change_timing_fine.gbc and speed_change_cancel.gbc to both work)
// Console.WriteLine("at stop " + timer.divider_reg + " " + timer.timer_control); // Console.WriteLine("at stop " + timer.divider_reg + " " + timer.timer_control);
// only if the timer mode is 1, an extra tick of the timer is counted before the reset // only if the timer mode is 1, an extra tick of the timer is counted before the reset
// this varies between console revisions // this varies between console revisions
if ((timer.timer_control & 3) == 1) if ((timer.timer_control & 7) == 5)
{ {
if((timer.divider_reg & 0x7) == 7) if ((timer.divider_reg & 0x7) == 7)
{ {
timer.old_state = true; timer.old_state = true;
} }
} }
timer.divider_reg = 0xFFFF; timer.divider_reg = 0xFFFF;
double_speed = !double_speed;
return 0;
}
else
{
return 0; return 0;
} }
} }