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[NES] fixup square waves a tiny bit

This commit is contained in:
zeromus 2011-03-13 01:40:09 +00:00
parent 44619d747c
commit fe7e80d723
2 changed files with 12 additions and 7 deletions
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17
BizHawk.Emulation/Consoles/Nintendo/NES/APU.cs
View File

@ -36,7 +36,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
//reg0
int duty, length_halt, envelope_constant, envelope_cnt_value;
//reg1
int sweep_en, timer_period, negate, shiftcount;
int sweep_en, sweep_period, negate, shiftcount;
//reg2/3
int len_cnt;
int timer_raw_reload_value, timer_reload_value;
@ -58,7 +58,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
case 1:
shiftcount = val & 7;
negate = (val >> 3) & 1;
timer_period = (val >> 4) & 7;
sweep_period = (val >> 4) & 7;
sweep_en = (val >> 7) & 1;
break;
case 2:
@ -71,6 +71,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
timer_reload_value = (timer_reload_value & 0xFF) | ((val & 0x07) << 8);
timer_raw_reload_value = timer_reload_value;
sq_seq = 0;
timer_counter = timer_raw_reload_value;
calc_sweep_unit();
//serves as a useful note-on diagnostic
Console.WriteLine("{0} timer_reload_value: {1}", unit, timer_reload_value);
@ -81,6 +82,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
int swp_val_result;
bool swp_silence;
int sq_seq;
int timer_counter;
public int sample;
int envelope_value;
@ -120,11 +122,12 @@ namespace BizHawk.Emulation.Consoles.Nintendo
//writes and frame counter, and envelope is set through the memory
//regs also, so we just need to deal with the timer and sequencer here
if (--timer_period==0)
timer_counter--;
if (timer_counter == 0)
{
sq_seq = (sq_seq + 1) & 7;
//reload timer
timer_period = timer_raw_reload_value + 2;
timer_counter = timer_raw_reload_value + 2;
}
if (PULSE_DUTY[duty,sq_seq] == 1) //we are outputting something
{
@ -182,7 +185,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
if (sequencer_irq_inhibit == 0)
{
sequencer_irq_flag = 1;
//TODO - actually fire IRQ
//nes.cpu.Interrupt = true;
//Console.WriteLine("APU trigger IRQ (cpu needs implementation)");
}
sequencer_step = 0;
}
@ -245,13 +249,14 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{
pulse[0].Run();
pulse[1].Run();
sequencer_tick();
int mix = pulse[0].sample;
mix += pulse[1].sample;
EmitSample(mix);
sequencer_tick();
//since the units run concurrently, the APU frame sequencer
//is ran last because
//it can change the ouput values of the pulse/triangle channels,

2
BizHawk.Emulation/Consoles/Nintendo/NES/PPU.regs.cs
View File

@ -315,7 +315,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
if (!reg_2000.vblank_nmi_gen & ((value & 0x80) != 0) && (Reg2002_vblank_active))
{
//if we just unleashed the vblank interrupt then activate it now
//FCEUX would use a "trigger NMI2" here. why?? why isn't a regular NMI good enough?
//FCEUX would use a "trigger NMI2" here in order to result in some delay effect
TriggerNMI();
}
reg_2000.Value = value;