mirror of https://github.com/bsnes-emu/bsnes.git
63 lines
1.6 KiB
C++
Executable File
63 lines
1.6 KiB
C++
Executable File
#ifdef SMP_CPP
|
|
|
|
void SMP::add_clocks(unsigned clocks) {
|
|
step(clocks);
|
|
synchronize_dsp();
|
|
|
|
#if defined(DEBUGGER)
|
|
synchronize_cpu();
|
|
#else
|
|
//forcefully sync S-SMP to S-CPU in case chips are not communicating
|
|
//sync if S-SMP is more than 24 samples ahead of S-CPU
|
|
if(clock > +(768 * 24 * (int64)24000000)) synchronize_cpu();
|
|
#endif
|
|
}
|
|
|
|
void SMP::cycle_edge() {
|
|
timer0.tick();
|
|
timer1.tick();
|
|
timer2.tick();
|
|
|
|
//TEST register S-SMP speed control
|
|
//24 clocks have already been added for this cycle at this point
|
|
switch(status.clock_speed) {
|
|
case 0: break; //100% speed
|
|
case 1: add_clocks(24); break; // 50% speed
|
|
case 2: while(true) add_clocks(24); // 0% speed -- locks S-SMP
|
|
case 3: add_clocks(24 * 9); break; // 10% speed
|
|
}
|
|
}
|
|
|
|
template<unsigned timer_frequency>
|
|
void SMP::Timer<timer_frequency>::tick() {
|
|
//stage 0 increment
|
|
stage0_ticks += smp.status.timer_step;
|
|
if(stage0_ticks < timer_frequency) return;
|
|
stage0_ticks -= timer_frequency;
|
|
|
|
//stage 1 increment
|
|
stage1_ticks ^= 1;
|
|
synchronize_stage1();
|
|
}
|
|
|
|
template<unsigned timer_frequency>
|
|
void SMP::Timer<timer_frequency>::synchronize_stage1() {
|
|
bool new_line = stage1_ticks;
|
|
if(smp.status.timers_enable == false) new_line = false;
|
|
if(smp.status.timers_disable == true) new_line = false;
|
|
|
|
bool old_line = current_line;
|
|
current_line = new_line;
|
|
if(old_line != 1 || new_line != 0) return; //only pulse on 1->0 transition
|
|
|
|
//stage 2 increment
|
|
if(enable == false) return;
|
|
if(++stage2_ticks != target) return;
|
|
|
|
//stage 3 increment
|
|
stage2_ticks = 0;
|
|
stage3_ticks++;
|
|
}
|
|
|
|
#endif
|