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core, add TH pad pin latency after switching to input

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kub 2022-10-03 07:55:25 +00:00
parent 54f74b8100
commit 66e9abff6d
1 changed files with 9 additions and 4 deletions
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13
pico/memory.c
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@ -314,6 +314,8 @@ static port_read_func *port_readers[3] = {
read_nothing read_nothing
}; };
static int padTHLatency[3];
static NOINLINE u32 port_read(int i) static NOINLINE u32 port_read(int i)
{ {
u32 data_reg = PicoMem.ioports[i + 1]; u32 data_reg = PicoMem.ioports[i + 1];
@ -326,10 +328,8 @@ static NOINLINE u32 port_read(int i)
// disables output before doing TH-low read, so don't emulate it for TH. // disables output before doing TH-low read, so don't emulate it for TH.
// Decap Attack reportedly doesn't work on Nomad but works on must // Decap Attack reportedly doesn't work on Nomad but works on must
// other MD revisions (different pull-up strength?). // other MD revisions (different pull-up strength?).
if (PicoIn.AHW & (PAHW_32X|PAHW_MCD)) // don't do it on 32X, it breaks WWF Raw u32 mask = 0x3f | (padTHLatency[i] < SekCyclesDone() ? 0x40 : 0);
out |= 0x7f & ~ctrl_reg; out |= mask & ~ctrl_reg;
else
out |= 0x3f & ~ctrl_reg;
in = port_readers[i](i, out); in = port_readers[i](i, out);
@ -407,6 +407,11 @@ NOINLINE void io_ports_write(u32 a, u32 d)
Pico.m.padTHPhase[a - 1]++; Pico.m.padTHPhase[a - 1]++;
} }
// after pulling down TH there's a latency before the new value can be read
// back as input (see Decap Attack, not in Samurai Showdown, 32x WWF Raw)
if (a >= 4 && a <= 5 && !(d & 0x40))
padTHLatency[a - 4] = SekCyclesDone() + 25;
// certain IO ports can be used as RAM // certain IO ports can be used as RAM
PicoMem.ioports[a] = d; PicoMem.ioports[a] = d;
} }