79 lines
2.8 KiB
Python
79 lines
2.8 KiB
Python
import unittest
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from h8536.emulator import H8536Emulator, ON_CHIP_RAM_START
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from h8536.emulator.constants import (
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FRT_TCR_OCIEA,
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FRT_TCSR_OCFA,
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FRT2_TCR,
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FRT2_TCSR,
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IPRC,
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VECTOR_FRT2_OCIA,
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)
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def rom_with_reset(*, reset: int = 0x1000, size: int = 0x1040) -> 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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def write_mov_b_abs_imm(rom: bytearray, address: int, target: int, value: int) -> int:
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rom[address : address + 5] = bytes([0x15, (target >> 8) & 0xFF, target & 0xFF, 0x06, value & 0xFF])
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return address + 5
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class Frt2OciaTimerTest(unittest.TestCase):
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def test_frt2_ocia_vector_can_fire_and_decrement_ram(self):
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rom = rom_with_reset()
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rom[VECTOR_FRT2_OCIA : VECTOR_FRT2_OCIA + 2] = (0x1020).to_bytes(2, "big")
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pc = 0x1000
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rom[pc : pc + 3] = b"\x5F\xFE\x80" # MOV:I.W #H'FE80, R7
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pc += 3
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# IPRC bits 6..4 are FRT1 and bits 2..0 are FRT2, so H'06 makes
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# only the FRT2 priority field high enough to pass interrupt mask 0.
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pc = write_mov_b_abs_imm(rom, pc, IPRC, 0x06)
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pc = write_mov_b_abs_imm(rom, pc, FRT2_TCR, FRT_TCR_OCIEA)
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rom[pc : pc + 2] = b"\x20\xFE" # BRA self
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isr = 0x1020
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rom[isr : isr + 4] = bytes([0x15, (ON_CHIP_RAM_START >> 8) & 0xFF, ON_CHIP_RAM_START & 0xFF, 0x0C])
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isr += 4
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rom[isr : isr + 4] = bytes([0x15, (FRT2_TCSR >> 8) & 0xFF, FRT2_TCSR & 0xFF, 0xD5])
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rom[isr + 4] = 0x0A # RTE
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emulator = H8536Emulator(bytes(rom), frt2_ocia_steps=2)
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emulator.memory.write8(ON_CHIP_RAM_START, 3)
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emulator.run(max_steps=5)
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self.assertEqual(emulator.memory.read8(ON_CHIP_RAM_START), 2)
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self.assertFalse(emulator.memory.read8(FRT2_TCSR) & FRT_TCSR_OCFA)
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self.assertEqual(emulator.cpu.pc, isr + 4)
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def test_frt2_ocia_does_not_fire_when_ociea_disabled(self):
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rom = rom_with_reset()
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rom[VECTOR_FRT2_OCIA : VECTOR_FRT2_OCIA + 2] = (0x1020).to_bytes(2, "big")
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pc = 0x1000
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rom[pc : pc + 3] = b"\x5F\xFE\x80" # MOV:I.W #H'FE80, R7
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pc += 3
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pc = write_mov_b_abs_imm(rom, pc, IPRC, 0x06)
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rom[pc : pc + 2] = b"\x20\xFE" # BRA self
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rom[0x1020 : 0x1024] = bytes(
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[0x15, (ON_CHIP_RAM_START >> 8) & 0xFF, ON_CHIP_RAM_START & 0xFF, 0x0C]
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)
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rom[0x1024] = 0x0A # RTE
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emulator = H8536Emulator(bytes(rom), frt2_ocia_steps=1)
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emulator.memory.write8(ON_CHIP_RAM_START, 3)
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emulator.run(max_steps=8)
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self.assertEqual(emulator.memory.read8(ON_CHIP_RAM_START), 3)
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self.assertEqual(emulator.memory.read8(FRT2_TCSR) & FRT_TCSR_OCFA, 0)
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self.assertEqual(emulator.cpu.pc, pc)
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if __name__ == "__main__":
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unittest.main()
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