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shiweicl1314 发表于 2012-5-21 11:36:28

FPGA优化结果占用零资源问题

我设计了一个LCD1602的程序，但是优化结果占用零个资源，我查看RTL的确生成了实际复杂的电路出来，包括输入输出端口都存在，就是不占用一个LE，下载到板子中也没反应，求高人指点，小弟不胜感激。

module lcd(clk,LCD_Rs,LCD_Rw,LCD_En,LCD_Data);
input clk;
output LCD_Rs,LCD_Rw,LCD_En;
output LCD_Data;
reg LCD_Rs,LCD_En;
regLCD_Data;

reg DIV_Clk;
regDIV_Cunt;
always@(posedge clk)
begin

DIV_Cunt =DIV_Cunt +1'b1;
if(DIV_Cunt==6'b111111)DIV_Clk =~DIV_Clk;
end

regsetp;
regCtrl;
always@(posedge DIV_Clk)
begin

case(setp)

8'd0:
      begin

         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h06;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd1:
      begin

         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h0c;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd2:
      begin

         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h14;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd3:
      begin

         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h38;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd4:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h80;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd5:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="w" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd6:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h81;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd7:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="w" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd8:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h82;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd9:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="w" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd10:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h83;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd11:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="." +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd12:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h84;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd13:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="s" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd14:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h85;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd15:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="h" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd16:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h86;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd17:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="i" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd18:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h87;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd19:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="w" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd20:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h88;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd21:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="e" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd22:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h89;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd23:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="i" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd24:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h8a;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd25:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="." +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd26:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h8b;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd27:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="c" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd28:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h8c;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd29:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="o" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd30:
      begin
         LCD_Rs =1'b1;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data =8'h8d;
            2'd2: LCD_En =1'b1;
         endcase
      end

8'd31:
      begin
         LCD_Rs =1'b0;
         case(Ctrl)

            2'd0: LCD_En =1'b0;
            2'd1: LCD_Data ="m" +8'h30;
            2'd2: LCD_En =1'b1;
         endcase
      end

endcase

Ctrl =Ctrl +1'b1;

if(Ctrl==2'd3)
begin
      setp =setp +1'b1;
      Ctrl =2'd0;
      if(setp >8'd32)setp =8'd32;
end

end

assign LCD_Rw =1'b0;

endmodule

shiweicl1314 发表于 2012-5-21 11:40:58

回复 1# shiweicl1314

   if(Ctrl==2'd3)
begin
      setp =setp +1'b1;
      Ctrl =2'd0;
      //if(setp >8'd32)setp =8'd32;
end

我将最下面那条语句注视掉后，资源占用就正常了，但是这样的结果就不是我想要的了。

shiweicl1314 发表于 2012-5-21 11:50:58

问题已经解决了，

页: [1]

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FPGA优化结果占用零资源问题