BlackMark
7716e1e291
--scan's walk was unwalkable on POSIX: probe rates have no termios B-constant, so the first off-nominal probe raised out of the loop. The port speaks termios2 BOTHER now (red-proven on a pty at 9984 Bd), the probe's open lives inside the walk's error handling, an fd no longer leaks on an unmakeable rate, and the swallowed unknown-signature reply is named at timeout instead of reported as silence. CMakePresets.json's generator emits the submodule toolchain path it had drifted from — a hand edit on a generated file, exactly the class rule 10 exists for — and presets.generated gates the pair from here on (the marker CMake rejects at the presets root stayed out; the check is the guard). The over-slot image guard the tsb runner gained reaches the pureboot runner too; the GPIO bridge's delivery comment states the hardware truth (RXC at the stop bit's sampling point); the hardware suite gains the scan check — the one place the rate physics is real; and the libavr pin advances over both audit rounds. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
#!/usr/bin/env python3
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"""--scan's walk and report logic, no simulator: the probe order, the rate
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arithmetic, and the advice's direction. The rate physics itself is not
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sim-testable — a pty carries bytes at any termios rate — so what the wire
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would arbitrate is pinned here as logic instead.
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Usage: test_scan.py <tool_py>
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"""
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import os
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import sys
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def fail(message):
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print(f"FAIL: {message}")
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sys.exit(1)
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def main():
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sys.path.insert(0, os.path.dirname(os.path.abspath(sys.argv[1])))
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import pureboot as pb
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walk = pb.scan_ratios()
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if walk != [0, -2, 2, -4, 4, -6, 6, -8, 8, -10, 10]:
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fail(f"probe walk is not built-rate-first, nearest-out: {walk}")
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if pb.scan_rate(9600, 4) != 9984 or pb.scan_rate(9600, -4) != 9216:
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fail("probe rate arithmetic")
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if pb.scan_rate(115200, 0) != 115200:
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fail("the built rate must probe unchanged")
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# A loader answering fast means a fast oscillator: the trim goes down.
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report = "\n".join(pb.scan_report(9600, 4, 6))
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for needle in ("9984", "+4 %", "--baud 9984", "4 steps lower", "pureboot 6"):
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if needle not in report:
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fail(f"+4 % report lacks {needle!r}:\n{report}")
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report = "\n".join(pb.scan_report(9600, -6, 6))
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if "6 steps higher" not in report:
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fail(f"-6 % report advises the wrong direction:\n{report}")
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report = "\n".join(pb.scan_report(9600, 0, 6))
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if "none" not in report or "steps" in report:
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fail(f"an on-rate answer must advise no trim:\n{report}")
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report = "\n".join(pb.scan_report(9600, 4, 6, clock=9600000))
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if "9984000" not in report:
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fail(f"the absolute clock must scale with the found ratio:\n{report}")
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# The walk's rates mostly have no termios B-constant, so the POSIX port
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# must set them through termios2 — probed on a pty, which accepts the
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# ioctl without caring about the speed. Without this every off-nominal
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# probe would abort the walk on the platform --scan matters most on.
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if os.name == "posix":
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import pty
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master, slave = pty.openpty()
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try:
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port = pb.Port(os.ttyname(slave), pb.scan_rate(9600, 4))
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port.set_baud(pb.scan_rate(9600, -4))
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port.close()
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except pb.Error as error:
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fail(f"PosixPort refused an off-nominal probe rate: {error}")
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finally:
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os.close(master)
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os.close(slave)
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print("OK")
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if __name__ == "__main__":
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main()
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