mirror of
https://github.com/NawfalMotii79/PLFM_RADAR.git
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Jason
e9e301dc50
The packet-boundary scanner only checked header + footer bytes, so any
payload byte that happened to be 0xAA (or 0xBB) and which lined up with
a 0x55 at offset+10 (or +25) was accepted as a packet. A single corrupt
byte could permanently shift the binning until the next frame_start
re-sync.
Added two structural sentinel checks against fixed bits the FPGA
emitter always drives to known values:
- data byte 9 = {frame_start, 6'b0, cfar_detection} -> bits[6:1]==0
- status byte 1 = high byte of status_words[0] -> 0xFF
Combined with the existing footer check, false-match probability drops
from ~1/256 to ~1/16384 (data) and ~1/65536 (status). Mock generators
already produce conformant bit patterns, so existing parser/mock-read
tests pass unchanged.
New tests:
- test_find_boundaries_rejects_false_data_header (forged 0xAA...0x55)
- test_find_boundaries_rejects_false_status_header (forged 0xBB...0x55)
- test_find_boundaries_recovers_after_byte_drop (single-byte loss)
Tests: GUI 96/96 (was 93), test_v7 83/83, MCU 75/75, ruff clean.
No RTL change -- wire format is unchanged; this hardens the parser only.