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Fix 6 RTL bugs in FPGA signal processing chain

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- nco_400m_enhanced.v: Correct sine LUT values (3.7x quadrature error)
- ddc_400m.v: Fix wire forward-declaration (Verilog-2001 compliance)
- plfm_chirp_controller.v: Remove multi-driven chirp_counter (critical)
- radar_system_top.v: Fix CFAR wire-as-reg, connect chirp_counter to receiver
- radar_receiver_final.v: Promote chirp_counter to input port

All fixes verified with Icarus Verilog 13.0 testbenches (144/144 tests pass).
This commit is contained in:
Jason
2026-03-15 06:14:04 +02:00
parent 7510e31c20
commit 76183e2e95
5 changed files with 53 additions and 47 deletions
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9_Firmware/9_2_FPGA/nco_400m_enhanced.v
+18 -16
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@@ -31,22 +31,24 @@ initial begin
end
// Initialize quarter-wave sine LUT (0-90 degrees)
sin_lut[0] = 16'h0000; sin_lut[1] = 16'h0324; sin_lut[2] = 16'h0647; sin_lut[3] = 16'h096A;
sin_lut[4] = 16'h0C8B; sin_lut[5] = 16'h0FA9; sin_lut[6] = 16'h12C4; sin_lut[7] = 16'h15DB;
sin_lut[8] = 16'h18EC; sin_lut[9] = 16'h1BF8; sin_lut[10] = 16'h1EFC; sin_lut[11] = 16'h21F8;
sin_lut[12] = 16'h24EB; sin_lut[13] = 16'h27D4; sin_lut[14] = 16'h2AB1; sin_lut[15] = 16'h2D82;
sin_lut[16] = 16'h3045; sin_lut[17] = 16'h32F9; sin_lut[18] = 16'h359D; sin_lut[19] = 16'h3830;
sin_lut[20] = 16'h3AB1; sin_lut[21] = 16'h3D1E; sin_lut[22] = 16'h3F76; sin_lut[23] = 16'h41B8;
sin_lut[24] = 16'h43E3; sin_lut[25] = 16'h45F5; sin_lut[26] = 16'h47EE; sin_lut[27] = 16'h49CD;
sin_lut[28] = 16'h4B90; sin_lut[29] = 16'h4D37; sin_lut[30] = 16'h4EC1; sin_lut[31] = 16'h502D;
sin_lut[32] = 16'h517A; sin_lut[33] = 16'h52A8; sin_lut[34] = 16'h53B6; sin_lut[35] = 16'h54A4;
sin_lut[36] = 16'h5572; sin_lut[37] = 16'h561F; sin_lut[38] = 16'h56AA; sin_lut[39] = 16'h5715;
sin_lut[40] = 16'h575E; sin_lut[41] = 16'h5785; sin_lut[42] = 16'h578B; sin_lut[43] = 16'h576E;
sin_lut[44] = 16'h5730; sin_lut[45] = 16'h56D0; sin_lut[46] = 16'h564E; sin_lut[47] = 16'h55AB;
sin_lut[48] = 16'h54E7; sin_lut[49] = 16'h5403; sin_lut[50] = 16'h52FE; sin_lut[51] = 16'h51DA;
sin_lut[52] = 16'h5096; sin_lut[53] = 16'h4F34; sin_lut[54] = 16'h4DB4; sin_lut[55] = 16'h4C17;
sin_lut[56] = 16'h4A5E; sin_lut[57] = 16'h4889; sin_lut[58] = 16'h4699; sin_lut[59] = 16'h448F;
sin_lut[60] = 16'h426B; sin_lut[61] = 16'h402F; sin_lut[62] = 16'h3DDB; sin_lut[63] = 16'h3B71;
// LUT[k] = round(32767 * sin(pi/2 * k / 64)), monotonically increasing
// FIX: Original LUT peaked at index 42 then decreased — broke cos=sin[63-k] quadrature
sin_lut[0] = 16'h0000; sin_lut[1] = 16'h0324; sin_lut[2] = 16'h0648; sin_lut[3] = 16'h096A;
sin_lut[4] = 16'h0C8C; sin_lut[5] = 16'h0FAB; sin_lut[6] = 16'h12C8; sin_lut[7] = 16'h15E2;
sin_lut[8] = 16'h18F9; sin_lut[9] = 16'h1C0B; sin_lut[10] = 16'h1F1A; sin_lut[11] = 16'h2223;
sin_lut[12] = 16'h2528; sin_lut[13] = 16'h2826; sin_lut[14] = 16'h2B1F; sin_lut[15] = 16'h2E11;
sin_lut[16] = 16'h30FB; sin_lut[17] = 16'h33DF; sin_lut[18] = 16'h36BA; sin_lut[19] = 16'h398C;
sin_lut[20] = 16'h3C56; sin_lut[21] = 16'h3F17; sin_lut[22] = 16'h41CE; sin_lut[23] = 16'h447A;
sin_lut[24] = 16'h471C; sin_lut[25] = 16'h49B4; sin_lut[26] = 16'h4C3F; sin_lut[27] = 16'h4EBF;
sin_lut[28] = 16'h5133; sin_lut[29] = 16'h539B; sin_lut[30] = 16'h55F5; sin_lut[31] = 16'h5842;
sin_lut[32] = 16'h5A82; sin_lut[33] = 16'h5CB3; sin_lut[34] = 16'h5ED7; sin_lut[35] = 16'h60EB;
sin_lut[36] = 16'h62F1; sin_lut[37] = 16'h64E8; sin_lut[38] = 16'h66CF; sin_lut[39] = 16'h68A6;
sin_lut[40] = 16'h6A6D; sin_lut[41] = 16'h6C23; sin_lut[42] = 16'h6DC9; sin_lut[43] = 16'h6F5E;
sin_lut[44] = 16'h70E2; sin_lut[45] = 16'h7254; sin_lut[46] = 16'h73B5; sin_lut[47] = 16'h7504;
sin_lut[48] = 16'h7641; sin_lut[49] = 16'h776B; sin_lut[50] = 16'h7884; sin_lut[51] = 16'h7989;
sin_lut[52] = 16'h7A7C; sin_lut[53] = 16'h7B5C; sin_lut[54] = 16'h7C29; sin_lut[55] = 16'h7CE3;
sin_lut[56] = 16'h7D89; sin_lut[57] = 16'h7E1D; sin_lut[58] = 16'h7E9C; sin_lut[59] = 16'h7F09;
sin_lut[60] = 16'h7F61; sin_lut[61] = 16'h7FA6; sin_lut[62] = 16'h7FD8; sin_lut[63] = 16'h7FF5;
end
// Quadrant determination