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test/hil: bound MIDI reads by deadline

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This commit is contained in:
Zixun LI
2026-07-27 17:11:46 +02:00
parent b3708aebd9
commit 9a4d71162b
1 changed files with 29 additions and 18 deletions
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47
test/hil/hil_test.py
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@ -1579,26 +1579,37 @@ def test_device_midi_test(board):
# Read MIDI messages and verify note on/off
import select
with open(midi_port, 'rb') as f:
notes = []
midi_fd = os.open(midi_port, os.O_RDONLY | os.O_NONBLOCK)
try:
data = bytearray()
# Read for up to 3 seconds to capture a few notes (286ms interval)
end_time = time.monotonic() + 3
while time.monotonic() < end_time:
ready, _, _ = select.select([f], [], [], 0.5)
if ready:
data = f.read(64)
if data:
# Parse MIDI bytes: note_on = 0x90, note_off = 0x80
i = 0
while i + 2 < len(data):
status = data[i]
if (status & 0xF0) == 0x90: # Note On
notes.append(data[i + 1])
i += 3
elif (status & 0xF0) == 0x80: # Note Off
i += 3
else:
i += 1
while (remaining := end_time - time.monotonic()) > 0:
ready, _, _ = select.select([midi_fd], [], [], min(0.5, remaining))
if not ready:
continue
try:
chunk = os.read(midi_fd, 64)
except BlockingIOError:
continue
if not chunk:
break
data.extend(chunk)
finally:
os.close(midi_fd)
notes = []
# Parse MIDI bytes: note_on = 0x90, note_off = 0x80
i = 0
while i + 2 < len(data):
status = data[i]
if (status & 0xF0) == 0x90: # Note On
notes.append(data[i + 1])
i += 3
elif (status & 0xF0) == 0x80: # Note Off
i += 3
else:
i += 1
assert len(notes) >= 2, f'Expected at least 2 MIDI notes, got {len(notes)}'
# Verify notes are from the expected sequence