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https://github.com/bsnes-emu/bsnes.git
synced 2025-02-22 06:02:28 +01:00
40802b0b9f
byuu says:
Changelog:
- fc/controller: added ControllerPort class; removed Peripherals class
- md/controller/gamepad: removed X,Y,Z buttons since this isn't a
6-button controller
- ms/controller: added ControllerPort class (not used in Game Gear
mode); removed Peripherals class
- pce/controller: added ControllerPort class; removed Peripherals
class
- processor/spc700: idle(address) is part of SMP class again, contains
flag to detect mov (x)+ edge case
- sfc/controller/super-scope,justifier: use CPU frequency instead of
hard-coding NTSC frequency
- sfc/cpu: move 4x8-bit SMP ports to SMP class
- sfc/smp: move APU RAM to DSP class
- sfc/smp: improved emulation of TEST registers bits 4-7 [information
from nocash]
- d4,d5 is RAM wait states (1,2,5,10)
- d6,d7 is ROM/IO wait states (1,2,5,10)
- sfc/smp: code cleanup to new style (order from lowest to highest
bits; use .bit(s) functions)
- sfc/smp: $00f8,$00f9 are P4/P5 auxiliary ports; named the registers
better
48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
auto SMP::step(uint clocks) -> void {
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Thread::step(clocks);
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synchronize(dsp);
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#if defined(DEBUGGER)
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synchronize(cpu);
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#else
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//forcefully sync S-SMP to S-CPU in case chips are not communicating
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//sync if S-SMP is more than 1ms ahead of S-CPU
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if(clock() - cpu.clock() > Thread::Second / 1'000) synchronize(cpu);
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#endif
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}
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auto SMP::cycleEdge() -> void {
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timer0.tick();
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timer1.tick();
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timer2.tick();
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}
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template<uint Frequency> auto SMP::Timer<Frequency>::tick() -> void {
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//stage 0 increment
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stage0 += smp.io.timerStep;
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if(stage0 < Frequency) return;
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stage0 -= Frequency;
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//stage 1 increment
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stage1 ^= 1;
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synchronizeStage1();
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}
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template<uint Frequency> auto SMP::Timer<Frequency>::synchronizeStage1() -> void {
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bool newLine = stage1;
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if(!smp.io.timersEnable) newLine = false;
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if(smp.io.timersDisable) newLine = false;
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bool oldLine = line;
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line = newLine;
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if(oldLine != 1 || newLine != 0) return; //only pulse on 1->0 transition
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//stage 2 increment
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if(!enable) return;
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if(++stage2 != target) return;
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//stage 3 increment
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stage2 = 0;
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stage3++;
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}
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