Changeset 50 for trunk/MultiChannelUSB/analyser.v

Timestamp:

Sep 16, 2009, 12:51:00 PM (15 years ago)

Author:

demin

Message:

fix peak detection logic and add peak threshold

File:

• trunk/MultiChannelUSB/analyser.v (modified) (3 diffs)

trunk/MultiChannelUSB/analyser.v

@@ -5 +5 @@
                 input   wire    [1:0]   uwt_flag,
                 input   wire    [11:0]  uwt_data,
+                input   wire    [11:0]  threshold,
                 output  wire                    peak_ready,
                 output  wire    [11:0]  peak
@@ -58 +59 @@
                 state_next = state_reg;
                 counter_next = counter_reg;
-                peak_ready_next = 1'b0;
-                peak_next = 12'd0;
+                peak_ready_next = peak_ready_reg;
+                peak_next = peak_reg;
                 case (state_reg)
                         0: // skip first 16 samples
                         begin
+                                peak_next = 12'd0;
+                                peak_ready_next = 1'b0;
                                 if (data_ready)
                                 begin
@@ -89 +92 @@
                                 if (data_ready & uwt_flag[0])
                                 begin
-                                        peak_next = uwt_data - baseline;
-                                        peak_ready_next = 1'b1;
+                                        peak_next = (uwt_data > baseline) ? (uwt_data - baseline) : 12'd0;
+                                        peak_ready_next = (peak_next > threshold);
                 end
+                else
+                begin
+                                        peak_ready_next = 1'b0;
+                                end
                         end
 
                         default:
                         begin
+                                peak_next = 12'd0;
+                                peak_ready_next = 1'b0;
                                 state_next = 2'd0;
                         end