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9_Firmware/9_2_FPGA/fft_1024_inverse.v

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+`timescale 1ns / 1ps
+
+module fft_1024_inverse_enhanced (
+    input wire clk,
+    input wire reset_n,
+    input wire [15:0] data_i,
+    input wire [15:0] data_q,
+    input wire data_valid,
+    output wire [15:0] ifft_i,
+    output wire [15:0] ifft_q,
+    output wire ifft_valid
+);
+
+// ========== MATCH YOUR FFT IP CONFIGURATION ==========
+wire [15:0] s_axis_config_tdata;      // 16-bit
+wire s_axis_config_tvalid;
+wire s_axis_config_tready;
+wire [31:0] s_axis_data_tdata;        // 32-bit for your IP  {Q[15:0],I[15:0]}
+wire s_axis_data_tvalid;
+wire s_axis_data_tready;
+wire s_axis_data_tlast;
+wire [31:0] m_axis_data_tdata;        // 32-bit
+wire m_axis_data_tvalid;
+wire m_axis_data_tready;
+wire m_axis_data_tlast;
+
+// Configuration: bit 0 = 0 for inverse FFT
+assign s_axis_config_tdata = 16'h0000;
+assign s_axis_config_tvalid = 1'b1;
+
+
+assign s_axis_data_tdata = {data_q, data_i};
+assign s_axis_data_tvalid = data_valid;
+
+// Frame counter
+reg [9:0] sample_count;
+reg frame_active;
+always @(posedge clk or negedge reset_n) begin
+    if (!reset_n) begin
+        sample_count <= 0;
+        frame_active <= 0;
+    end else begin
+        if (data_valid && !frame_active) begin
+            frame_active <= 1'b1;
+            sample_count <= 0;
+        end
+        
+        if (frame_active && data_valid) begin
+            if (sample_count == 1023) begin
+                sample_count <= 0;
+                frame_active <= 0;
+            end else begin
+                sample_count <= sample_count + 1;
+            end
+        end
+    end
+end
+assign s_axis_data_tlast = (sample_count == 1023) && data_valid;
+// Output
+assign ifft_i = m_axis_data_tdata[15:0];   // I = lower 16 bits
+assign ifft_q = m_axis_data_tdata[31:16];  // Q = upper 16 bits
+assign ifft_valid = m_axis_data_tvalid;
+assign m_axis_data_tready = 1'b1;
+
+// Debug
+reg [31:0] debug_counter;
+always @(posedge clk) begin
+    debug_counter <= debug_counter + 1;
+    
+    if (debug_counter < 1000) begin
+        if (s_axis_config_tvalid && s_axis_config_tready) begin
+            $display("[IFFT_CORRECTED @%d] CONFIG ACCEPTED!", debug_counter);
+        end
+    end
+end
+
+// IFFT IP instance
+FFT_enhanced ifft_inverse_inst (  // Same IP core, different configuration
+    .aclk(clk),
+    .aresetn(reset_n),
+    
+    .s_axis_config_tdata(s_axis_config_tdata),
+    .s_axis_config_tvalid(s_axis_config_tvalid),
+    .s_axis_config_tready(s_axis_config_tready),
+    
+    .s_axis_data_tdata(s_axis_data_tdata),
+    .s_axis_data_tvalid(s_axis_data_tvalid),
+    .s_axis_data_tready(s_axis_data_tready),
+    .s_axis_data_tlast(s_axis_data_tlast),
+    
+    .m_axis_data_tdata(m_axis_data_tdata),
+    .m_axis_data_tvalid(m_axis_data_tvalid),
+    .m_axis_data_tlast(m_axis_data_tlast)
+    
+);
+
+endmodule