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2019-07-11 18:01:21 +03:00
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+module ov7670_capture #(
+    parameter   CAM_DATA_WIDTH = 12,
+                CAM_LINE = 9,
+                CAM_PIXEL = 10
+)(
+        output                          we,
+        output [CAM_DATA_WIDTH-1:0]     o_data_wr,
+        output [CAM_LINE-1:0]           o_line,
+        output [CAM_PIXEL-1:0]          o_pixel,
+        input           reset,
+        input           ov7670_pclk,
+        input           ov7670_vs,
+        input           ov7670_hs,
+        input  [7:0]    ov7670_data  
+        );
+
+//-----------internal regiters and wires-----------------
+
+reg [1:0] pixel_counter = 'h0;
+/* //   YUV grayscale mode
+reg [7:0] u;        // U=B-Y
+reg [7:0] v;        // V=R-Y
+reg [7:0] y0;       // Y=0.59G + 0.31R + 0.11B
+reg [7:0] y1;       // Y=0.59G + 0.31R + 0.11B
+*/
+    // Color mode RGB 565
+reg [7:0] byte1 = 'h0;
+reg [7:0] byte2 = 'h0;
+reg [7:0] byte3 = 'h0;
+reg [7:0] byte4 = 'h0;
+
+reg [CAM_LINE-1:0]  line = 'h0;
+reg [CAM_PIXEL-1:0] pixel = 'h0;
+reg                 vsync_old_reg = 'h0;
+reg                 hsync_old_reg = 'h0;
+
+
+//-------------------------------------------------------
+always@(posedge ov7670_pclk)begin
+    vsync_old_reg <= ov7670_vs;
+    hsync_old_reg <= ov7670_hs;
+end
+
+//-------------------------------------------------------
+
+always@(posedge ov7670_pclk ||  reset)begin
+    if (ov7670_hs== 0 || reset == 1) begin
+      pixel_counter <= 0;
+    end
+
+    if (ov7670_hs == 1 && ov7670_vs== 0 ) begin
+
+        case (pixel_counter)
+      /*    // YUV grayscale mode
+            2'b00: u    <= ov7670_data;
+            2'b01: y0   <= ov7670_data;
+            2'b10: v    <= ov7670_data;
+            2'b11: y1   <= ov7670_data;
+      */    // RGB color mode               
+            2'b00: byte1   <= ov7670_data;
+            2'b01: byte2   <= ov7670_data;
+            2'b10: byte3   <= ov7670_data;
+            2'b11: byte4   <= ov7670_data;  
+        endcase
+
+        if ( pixel_counter[0] == 1 ) begin
+            if (pixel < 639 ) 
+                pixel <= pixel +1;
+        end
+    
+        pixel_counter <= pixel_counter + 1;
+    end
+
+    if(hsync_old_reg==1 && ov7670_hs==0) begin
+            pixel <= 0;
+            line <= line + 1;
+    end
+
+    if(vsync_old_reg==1 && ov7670_vs == 0) begin
+        line <= 0;
+    end
+end
+
+assign o_pixel  = pixel;//[9:1];
+assign o_line   = line;//[8:1];
+assign we = (pixel_counter[0]==1'b1) ? 1'b1 : 1'b0;
+//assign we = (pixel_counter==2'b11) ? 1'b1 : 1'b0;
+
+// -------------- grayscale image from YUV ------------------------
+/*
+assign o_data_wr =  {y0[7:4],
+                     y0[7:4],
+                     y0[7:4]
+                     };
+*/
+//--------------- color RGB mode ---------------------------------
+
+assign o_data_wr = pixel_counter[1]  ? 
+                    { byte1[7:4],
+                    { byte1[2:0],byte2[7] },
+                      byte2[4:1]
+                     }
+                     :
+                    { byte3[7:4],
+                    { byte3[2:0],byte4[7] },
+                      byte4[4:1]
+                     };
+
+endmodule