78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""dlpc_rs485 协议自检(无硬件): 对照上游 protocols.md 的实测帧向量做回归
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用法: python selftest_rs485.py (全部通过退出码 0)
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"""
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import sys
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import dlpc_rs485 as d
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fails = []
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def check(name, got, want):
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ok = got == want
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print(('PASS' if ok else 'FAIL'), name, '->', got, '' if ok else f'(期望 {want})')
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if not ok:
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fails.append(name)
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# 1) 帧构造: protocols.md 实测示例 M730S0T2000
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f = d.build_frame('M730S0T2000')
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check('build_frame(M730S0T2000)', f.hex(' ').upper(),
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'D5 01 0B 4D 37 33 30 53 30 54 32 30 30 30 8C')
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# 2) 增量解析: ok 应答跨两个半包喂入
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p = d.FrameParser()
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r1 = p.feed(bytes.fromhex('B5 F0'))
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r2 = p.feed(bytes.fromhex('02 6F 6B CC'))
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check('split-feed frames', len(r1) + len(r2), 1)
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fr = (r1 + r2)[0]
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check('type_code', fr.type_code, 0xF0)
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check('payload', fr.payload, 'ok')
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check('describe(ok)', d.describe(fr), 'ok')
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# 3) 前导噪声 + 0xFD err:OL 译码(字符串标记, 不附 DLPC 释义)
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body = bytes.fromhex('FD 06 65 72 72 3A 4F 4C') # "err:OL"
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good = bytes([0xB5]) + body + bytes([d.sum_crc(body)])
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frames = d.FrameParser().feed(b'\x01\x02' + good)
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check('noise+err-frame count', len(frames), 1)
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check('describe(err:OL)', d.describe(frames[0]), '参数越界/读回复核不一致 err:OL')
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# 4) 0xFA + 数字错误码 err:3 追加 DLPC 释义
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body = bytes.fromhex('FA 05') + b'err:3'
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fa = bytes([0xB5]) + body + bytes([d.sum_crc(body)])
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frames = d.FrameParser().feed(fa)
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check('describe(err:3)', d.describe(frames[0]),
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'开光机通信失败 err:3（I2C NACK(器件无应答)）')
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# 5) CRC 坏帧被丢弃后继续同步到下一帧
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bad = bytearray(good)
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bad[-1] ^= 0xFF
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frames = d.FrameParser().feed(bytes(bad) + good)
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check('bad-crc then good', len(frames), 1)
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check('recovered type', frames[0].type_code, 0xFD)
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# 6) 非法输入拒绝
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for bad_cmd in ('', ' '):
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try:
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d.build_frame(bad_cmd)
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fails.append('empty-cmd-not-rejected')
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except ValueError:
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pass
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try:
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d.build_frame('M' * 40)
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fails.append('long-cmd-not-rejected')
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except ValueError:
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pass
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print('空/超长命令拒绝: PASS')
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# 7) 预设命令全部可组帧
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for _name, cmd, _note in d.PRESETS:
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d.build_frame(cmd)
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print(f'预设 {len(d.PRESETS)} 条全部可组帧: PASS')
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print('RESULT:', 'FAIL:' + ','.join(fails) if fails else 'ALL PASS')
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sys.exit(1 if fails else 0)
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