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Emualtor RX side

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Aiden
2026-05-25 21:25:10 +10:00
parent 752148c585
commit e141f3b30d
9 changed files with 597 additions and 2 deletions
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36
h8536/emulator/runner.py
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@@ -16,11 +16,19 @@ from .constants import (
IPRA,
IPRC,
IPRE,
SCI_SCR_RE,
SCI_SCR_RIE,
SCI_SCR_TIE,
SCI_SSR_FER,
SCI_SSR_ORER,
SCI_SSR_PER,
SCI_SSR_RDRF,
SCI_SSR_TDRE,
VECTOR_FRT1_OCIA,
VECTOR_FRT2_OCIA,
VECTOR_INTERVAL_TIMER,
VECTOR_SCI1_ERI,
VECTOR_SCI1_RXI,
VECTOR_SCI1_TXI,
)
from .cpu import CPUState, mask, s8, s16, sign_bit
@@ -97,6 +105,9 @@ class H8536Emulator:
return self.memory.rom.u16(0)
raise DecodeError("ROM does not contain a reset vector at H'0000")
def inject_sci1_rx_byte(self, value: int) -> None:
self.memory.inject_sci1_rx_byte(value)
def step(self) -> str:
pc = self.cpu.pc
if self.p9_fast_path.try_handle(self):
@@ -116,6 +127,8 @@ class H8536Emulator:
pass
elif raw[0] == 0x02 and len(raw) == 2:
self._pop_register_mask(raw[1])
elif raw[0] == 0x11 and len(raw) >= 2:
next_pc = self._indirect_jump_call(raw, pc, next_pc)
elif raw[0] == 0x12 and len(raw) == 2:
self._push_register_mask(raw[1])
elif raw[0] in (0x01, 0x06, 0x07) and len(raw) == 3 and 0xB8 <= raw[1] <= 0xBF:
@@ -366,6 +379,20 @@ class H8536Emulator:
return (next_pc + s16(int.from_bytes(raw[1:3], "big"))) & 0xFFFF
return int.from_bytes(raw[1:3], "big")
def _indirect_jump_call(self, raw: bytes, pc: int, next_pc: int) -> int:
op = raw[1]
if 0xC0 <= op <= 0xDF:
target = self.cpu.regs[op & 0x07] & 0xFFFF
elif 0xE0 <= op <= 0xEF and len(raw) >= 3:
target = (self.cpu.regs[op & 0x07] + s8(raw[2])) & 0xFFFF
elif 0xF0 <= op <= 0xFF and len(raw) >= 4:
target = (self.cpu.regs[op & 0x07] + s16(int.from_bytes(raw[2:4], "big"))) & 0xFFFF
else:
raise UnsupportedInstruction(pc, raw, H8536Decoder(self.memory.rom, br=self.cpu.br).decode(pc).text)
if 0xC8 <= op <= 0xCF or 0xD8 <= op <= 0xDF or 0xE8 <= op <= 0xEF or 0xF8 <= op <= 0xFF:
self._push16(next_pc)
return target
def _scb(self, raw: bytes, pc: int, next_pc: int) -> int:
reg = raw[1] & 0x07
condition = {0x01: False, 0x06: not self.cpu.z, 0x07: self.cpu.z}[raw[0]]
@@ -389,6 +416,15 @@ class H8536Emulator:
if self.cpu.interrupt_depth:
return
candidates: list[tuple[int, int, str]] = []
sci1_rx_interrupts_enabled = bool(self.sci1.scr & SCI_SCR_RIE and self.sci1.scr & SCI_SCR_RE)
if sci1_rx_interrupts_enabled and self.sci1.ssr & (SCI_SSR_ORER | SCI_SSR_FER | SCI_SSR_PER):
target = self._vector_target(VECTOR_SCI1_ERI)
if target is not None:
candidates.append((self._sci1_priority(), target, "sci1_eri"))
if sci1_rx_interrupts_enabled and self.sci1.ssr & SCI_SSR_RDRF:
target = self._vector_target(VECTOR_SCI1_RXI)
if target is not None:
candidates.append((self._sci1_priority(), target, "sci1_rxi"))
if self.sci1.scr & SCI_SCR_TIE and self.sci1.ssr & SCI_SSR_TDRE:
target = self._vector_target(VECTOR_SCI1_TXI)
if target is not None: