BlackMark
52c4cdab32
The RC-oscillator answer's host half. --scan probes ±10 % around the built rate in 2 % steps, nearest first, one activation window (one reset) per probe: a fixed-baud loader whose oscillator drifted answers at the ratio, and the report gives the session workaround (--baud), the offset, the OSCCAL direction at ~1 %/step, and the autobaud way out. The walk and the advice are logic-tested (test_scan.py, red-proven on the trim direction) — a pty carries bytes at any rate, so the wire cannot arbitrate them. On an autobaud session --info now reads the measured bit period from ram_start — the geometry table gains that column — and undoes the unit's encoding ((cycles − 8) / 4, floored: libavr's spin granule and per-bit overhead), so the printed clock is the true one within a granule; --clock turns it into a stated drift. The autobaud end-to-end asserts the figure inside exactly that envelope at both clock points. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
54 lines
1.7 KiB
Python
54 lines
1.7 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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print("OK")
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if __name__ == "__main__":
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main()
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