105 lines
3.6 KiB
Python
105 lines
3.6 KiB
Python
import unittest
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from h8536.emulator import H8536Emulator, MemoryMap, P7DDR, P7DR
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def rom_with_reset(*, reset: int = 0x1000, size: int = 0x1100) -> bytearray:
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rom = bytearray([0xFF] * size)
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rom[0:2] = reset.to_bytes(2, "big")
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return rom
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class EmulatorAddressingTest(unittest.TestCase):
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def test_p7dr_reads_external_pin_state_for_input_bits(self):
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memory = MemoryMap(b"\x00" * 4, p7_input=0xFF)
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memory.write8(P7DDR, 0x00)
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memory.write8(P7DR, 0x00)
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self.assertEqual(memory.read8(P7DR), 0xFF)
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def test_p7dr_output_bits_read_latch_while_input_bits_read_pins(self):
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memory = MemoryMap(b"\x00" * 4, p7_input=0x7F)
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memory.write8(P7DDR, 0x80)
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memory.write8(P7DR, 0x00)
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self.assertEqual(memory.read8(P7DR), 0x7F)
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def test_factory_eeprom_seed_populates_shadow_and_page_labels(self):
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rom = bytearray([0xFF] * 0xCB00)
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rom[0xC966:0xC968] = b"\x6B\x6F"
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rom[0xC974:0xC976] = b"\x80\x00"
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memory = MemoryMap(bytes(rom))
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memory.seed_factory_eeprom_and_shadow()
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self.assertEqual(memory.read16(0xF402), 0x6B6F)
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self.assertEqual(memory.p9_bus.fast_read_word(0x0010), (True, 0x8000))
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self.assertEqual(memory.p9_bus.fast_read_word(0x0110), (True, 0x8000))
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self.assertEqual(memory.p9_bus.fast_read_word(0x0002), (True, 0x6B6F))
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self.assertEqual(memory.p9_bus.fast_read_word(0x0102), (True, 0x2020))
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def test_txi_indexed_byte_load_uses_signed_word_displacement_and_full_index_register(self):
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rom = rom_with_reset()
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rom[0x1000:0x1004] = b"\xF0\xF8\x58\x80" # MOV:G.B @(-H'07A8,R0), R0
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emulator = H8536Emulator(bytes(rom))
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emulator.cpu.regs[0] = 5
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emulator.memory.write8(0xF85D, 0xA6)
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emulator.step()
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self.assertEqual(emulator.cpu.regs[0], 0x00A6)
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self.assertEqual(emulator.cpu.pc, 0x1004)
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def test_txi_indexed_byte_load_preserves_destination_high_byte(self):
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rom = rom_with_reset()
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rom[0x1000:0x1004] = b"\xF0\xF8\x58\x80" # MOV:G.B @(-H'07A8,R0), R0
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emulator = H8536Emulator(bytes(rom))
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emulator.cpu.regs[0] = 0x0105
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emulator.memory.write8(0xF95D, 0x4B)
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emulator.step()
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self.assertEqual(emulator.cpu.regs[0], 0x014B)
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def test_extu_byte_clears_high_byte_before_txi_indexed_load(self):
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rom = rom_with_reset()
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rom[0x1000:0x1002] = b"\xA0\x12" # EXTU.B R0
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rom[0x1002:0x1006] = b"\xF0\xF8\x58\x80" # MOV:G.B @(-H'07A8,R0), R0
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emulator = H8536Emulator(bytes(rom))
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emulator.cpu.regs[0] = 0x0105
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emulator.memory.write8(0xF85D, 0xC7)
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emulator.memory.write8(0xF95D, 0x99)
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emulator.run(max_steps=2)
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self.assertEqual(emulator.cpu.regs[0], 0x00C7)
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self.assertEqual(emulator.cpu.pc, 0x1006)
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def test_byte_immediate_to_word_destination_writes_zero_extended_word(self):
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rom = rom_with_reset()
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rom[0x1000:0x1005] = b"\x1D\xF8\x70\x06\xAB" # MOV:G.W #H'AB, @H'F870
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emulator = H8536Emulator(bytes(rom))
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emulator.memory.write16(0xF870, 0xFFFF)
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emulator.step()
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self.assertEqual(emulator.memory.read16(0xF870), 0x00AB)
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self.assertEqual(emulator.cpu.pc, 0x1005)
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def test_signed_byte_displacement_addresses_below_base(self):
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rom = rom_with_reset()
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rom[0x1000:0x1003] = b"\xE1\xFE\x81" # MOV:G.B @(H'-02,R1), R1
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emulator = H8536Emulator(bytes(rom), p7_input=0x37)
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emulator.cpu.regs[1] = 0xFE90
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emulator.memory.write8(0xFE8E, 0x37)
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emulator.step()
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self.assertEqual(emulator.cpu.regs[1], 0xFE37)
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if __name__ == "__main__":
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unittest.main()
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