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rUv
7831f29436
Bug #2 (root cause): LD2410 probe-detection matched only the 4-byte head 0xF4F3F2F1, so a floating UART at 256000 baud could phantom-detect a sensor and spawn a UART task. Now requires a full validated report frame (head + sane length + tail 0xF8F7F6F5), extracted to mmwave_detect.h and shared with a host unit test (test_mmwave_detect.c, 8 vectors) so firmware and test can't diverge. Matches the validate-before-trust approach used for MR60 in #1107. Bug #1: sendto ENOMEM used a fixed 100 ms backoff too short to drain sustained lwIP/WiFi buffer pressure, so a node could stay stuck. Now exponential (100->200->...->2000 ms per consecutive ENOMEM, reset on first successful send). Removing the phantom LD2410 task (bug #2) also removes the extra load that tipped the reporter's tier-2 node into the stuck state. Validated on ESP32-S3 QFN56 rev v0.2 (the reporter's silicon): tier-2 streams ~100 frames/s with no stuck ENOMEM and correctly reports no mmWave (no phantom). LD2410 predicate truth table proven (head-without-tail REJECTED). Could not reproduce the reporter's environment-specific floating-pin noise, so the deterministic proof is the host unit test.
38 lines
1.5 KiB
C
38 lines
1.5 KiB
C
/**
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* @file mmwave_detect.h
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* @brief Pure (host-testable) mmWave frame-validation predicates for probe-time
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* sensor detection. No ESP-IDF deps — safe to #include in a host unit test.
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*
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* Detection must validate a *full* frame, never a bare header byte/pattern: a
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* floating UART with no sensor reads line noise that can contain header-looking
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* bytes, which the old loose checks mistook for a real sensor (#1107 MR60,
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* #1135 LD2410). These predicates are the validate-before-trust gate.
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*/
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#ifndef MMWAVE_DETECT_H
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#define MMWAVE_DETECT_H
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#include <stdint.h>
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#include <stdbool.h>
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/**
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* True iff buf[i..] begins a *validated* LD2410 report frame within [0,len):
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* F4 F3 F2 F1 | len(LE,2) | data[len] | F8 F7 F6 F5
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* Requires the head magic, a sane intra-frame length, AND the matching tail at
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* head+6+len. Pure noise that merely contains 0xF4F3F2F1 fails the tail check.
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*/
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static inline bool mmwave_ld2410_valid_at(const uint8_t *buf, int i, int len)
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{
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if (i < 0 || i + 5 >= len) return false;
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if (!(buf[i] == 0xF4 && buf[i+1] == 0xF3 && buf[i+2] == 0xF2 && buf[i+3] == 0xF1))
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return false;
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uint16_t flen = (uint16_t)buf[i+4] | ((uint16_t)buf[i+5] << 8);
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/* Real LD2410 report frames are small (basic=13, engineering=35). */
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if (flen < 1 || flen > 64) return false;
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int tail = i + 6 + (int)flen;
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if (tail + 3 >= len) return false;
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return buf[tail] == 0xF8 && buf[tail+1] == 0xF7
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&& buf[tail+2] == 0xF6 && buf[tail+3] == 0xF5;
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}
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#endif /* MMWAVE_DETECT_H */
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