p9 bus emulation

tests/test_emulator_fast_paths.py

@@ -1,6 +1,7 @@
 import unittest
 
 from h8536.emulator.fast_paths import (
+    LOC_BFE0_TRANSFER_WRAPPER,
     LOC_C08B_P9_WRITE_BYTE,
     LOC_C0DB_P9_READ_BYTE,
     P9FastPath,
@@ -105,6 +106,41 @@ class P9FastPathTest(unittest.TestCase):
         self.assertEqual(event.queue_depth, 1)
         self.assertEqual(fast_path.trace_lines(), ["read_byte pc=C0DB value=00 source=script:idle-panel queued=1"])
 
+    def test_wrapper_defaults_to_timeout_when_no_p9_device_response_is_queued(self):
+        emulator = H8536Emulator(bytes(rom_with_reset()))
+        emulator.cpu.pc = LOC_BFE0_TRANSFER_WRAPPER
+        emulator.cpu.regs[7] = 0xFE84
+        emulator.memory.write16(0xFE84, 0x789A)
+
+        fast_path = P9FastPath(P9FastPathConfig(enabled=True))
+
+        self.assertTrue(fast_path.try_handle(emulator))
+        event = fast_path.events[-1]
+        self.assertEqual(event.kind, "wrapper_timeout")
+        self.assertFalse(event.success)
+        self.assertEqual(event.source, "default_timeout")
+        self.assertEqual(emulator.cpu.regs[0], 0)
+        self.assertTrue(emulator.cpu.z)
+        self.assertEqual(emulator.cpu.pc, 0x789A)
+
+    def test_wrapper_can_succeed_from_queued_p9_device_response(self):
+        emulator = H8536Emulator(bytes(rom_with_reset()))
+        emulator.cpu.pc = LOC_BFE0_TRANSFER_WRAPPER
+        emulator.cpu.regs[7] = 0xFE86
+        emulator.memory.write16(0xFE86, 0x89AB)
+        emulator.memory.p9_bus.queue_wrapper_results([True], source="panel-script")
+
+        fast_path = P9FastPath(P9FastPathConfig(enabled=True))
+
+        self.assertTrue(fast_path.try_handle(emulator))
+        event = fast_path.events[-1]
+        self.assertEqual(event.kind, "wrapper_success")
+        self.assertTrue(event.success)
+        self.assertEqual(event.source, "panel-script")
+        self.assertEqual(emulator.cpu.regs[0], 1)
+        self.assertFalse(emulator.cpu.z)
+        self.assertEqual(emulator.cpu.pc, 0x89AB)
+
 
 if __name__ == "__main__":
     unittest.main()

tests/test_p9_bus.py

@@ -36,6 +36,16 @@ class P9BusTest(unittest.TestCase):
         self.assertEqual(bus.transmitted_bits, [1, 0, 1, 0, 0, 1, 0, 1])
         self.assertEqual(bus.byte_candidates, [0xA5])
         self.assertEqual([event.edge for event in bus.strobe_edges[:2]], ["rising", "falling"])
+        self.assertIn("tx_byte ddr=93 dr=82 value=A5", bus.trace_lines())
+
+    def test_wrapper_results_are_queued_then_default_timeout(self):
+        bus = P9Bus()
+        bus.queue_wrapper_results([True], source="panel-script")
+
+        self.assertEqual(bus.consume_wrapper_result(), (True, "panel-script", 0))
+        self.assertEqual(bus.consume_wrapper_result(), (False, "default_timeout", 0))
+        self.assertIn("wrapper_result ddr=00 dr=00 value=01 success=1 source=panel-script queued=0", bus.trace_lines())
+        self.assertIn("wrapper_result ddr=00 dr=00 value=00 success=0 source=default_timeout queued=0", bus.trace_lines())
 
 
 if __name__ == "__main__":