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feat: 2048-pt FFT upgrade with decimation=4, 512 output bins, 6m spacing

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Complete cross-layer upgrade from 1024-pt/64-bin to 2048-pt/512-bin FFT:

FPGA RTL (14+ modules):
- radar_params.vh: FFT_SIZE=2048, RANGE_BINS=512, 9-bit range, 6-bit stream
- fft_engine.v: 2048-pt FFT with XPM BRAM
- chirp_memory_loader_param.v: 2 segments x 2048 (was 4 x 1024)
- matched_filter_multi_segment.v: BRAM inference for overlap_cache, explicit ov_waddr
- mti_canceller.v: BRAM inference for prev_i/q arrays (was fabric FFs)
- doppler_processor.v: 16384-deep memory, 14-bit addressing
- cfar_ca.v: 512 rows, indentation fix
- radar_receiver_final.v: rising-edge detector for frame_complete, 11-bit sample_addr
- range_bin_decimator.v: 512 output bins
- usb_data_interface_ft2232h.v: bulk per-frame with Manhattan magnitude
- radar_mode_controller.v: XOR edge detector for toggle signals
- rx_gain_control.v: updated for new bin count

Python GUI + Protocol (8 files):
- radar_protocol.py: 512-bin bulk frame parser, LSB-first bitmap
- GUI_V65_Tk.py, v7/*.py: updated for 512 bins, 6m range resolution

Golden data + tests:
- All .hex/.csv/.npy golden references regenerated for 2048/512
- fft_twiddle_2048.mem added
- Deleted stale seg2/seg3 chirp mem files
- 9 new bulk frame cross-layer tests, deleted 6 stale per-sample tests
- Deleted stale tb_cross_layer_ft2232h.v and dead contract_parser functions
- Updated validate_mem_files.py for 2048/2-segment config

MCU: RadarSettings.cpp max_distance/map_size 1536->3072

All 4 CI jobs pass: 285 tests, 0 failures, 0 skips
This commit is contained in:
Jason
2026-04-16 17:27:55 +05:45
parent affa40a9d3
commit e9705e40b7
178 changed files with 687738 additions and 122880 deletions
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9_Firmware/9_2_FPGA/rx_gain_control.v
+1 -1
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@@ -54,7 +54,7 @@ module rx_gain_control (
input wire [3:0] agc_decay, // 0x2B: amplification step when weak (default 1)
input wire [3:0] agc_holdoff, // 0x2C: frames to wait before gain-up (default 4)
// Frame boundary pulse (1 clk cycle, from Doppler frame_complete)
// Frame boundary pulse (1 clk cycle, from edge detector in radar_receiver_final)
input wire frame_boundary,
// Data output (to matched filter)