EDA实验与实践 uart_test

A-Lin · 发表于 2019-5-8 07:00

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EDA实验与实践 uart_test

module uart_test(clock,key,rdata,wen,sdata,seg,dig);
input clock;                         //系统时钟(48MHz)
input[2:0] key;                         //按键输入(KEY1~KEY3)
input[7:0]rdata;                      //接收到的数据
output wen;                               //发送数据使能
output[7:0]sdata;                      //要发送的数据
output[7:0]seg;                         //数码管段码输出
output[7:0]dig;                         //数码管位码输出
//I/O寄存器
reg[7:0]sdata;
reg[7:0]seg;
reg[7:0]dig;
//内部寄存器
reg[16:0]count;                         //时钟分频计数器
reg[2:0]dout1,dout2,dout3,buff;          //消抖寄存器
reg[1:0] cnt;                            //数码管扫描计数器
reg[3:0]disp_dat;                      //数码管扫描显存
reg div_clk;                         //分频时钟
wire[2:0]key_edge;                      //按键消抖输出

//时钟分频部分
always @(posedge clock)
begin
if (count < 17'd120000)
begin
      count <= count + 1'b1;
      div_clk <= 1'b0;
   end
   else
   begin
      count <= 17'd0;
      div_clk <= 1'b1;
   end
end

//按键消抖部分
always @(posedge clock)
begin
if(div_clk)
begin
      dout1 <= key;
      dout2 <= dout1;
      dout3 <= dout2;
end
end

//按键边沿检测部分
always @(posedge clock)
begin
buff <= dout1 | dout2 | dout3;
end

assign key_edge = ~(dout1 | dout2 | dout3) & buff;

//2位16进制数输出部分
always @(posedge clock)                         //按键1
begin
if(key_edge[0])
      sdata[7:4] <= sdata[7:4] + 1'b1;
end

always @(posedge clock)                         //按键2
begin
if(key_edge[1])
      sdata[3:0] <= sdata[3:0] + 1'b1;
end

assign wen = key_edge[2];                      //按键3

//数码管扫描显示部分
always @(posedge clock)                //定义上升沿触发进程
begin
if(div_clk)
      cnt <= cnt + 1'b1;
end

always @(posedge clock)
begin
if(div_clk)
begin
      case(cnt)                               //选择扫描显示数据
         2'd0:disp_dat = sdata[7:4];          //第一个数码管
         2'd1:disp_dat = sdata[3:0];          //第二个数码管
         2'd2:disp_dat = rdata[7:4];          //第七个数码管
         2'd3:disp_dat = rdata[3:0];          //第八个数码管
      endcase
      case(cnt)                               //选择数码管显示位
         2'd0:dig = 8'b01111111;             //选择第一个数码管显示
         2'd1:dig = 8'b10111111;             //选择第二个数码管显示
         2'd2:dig = 8'b11111101;             //选择第七个数码管显示
         2'd3:dig = 8'b11111110;             //选择第八个数码管显示
      endcase
end
end

always @(disp_dat)
begin
case(disp_dat)                      //七段译码
      4'h0:seg = 8'hc0;             //显示0
      4'h1:seg = 8'hf9;             //显示1
      4'h2:seg = 8'ha4;             //显示2
      4'h3:seg = 8'hb0;             //显示3
      4'h4:seg = 8'h99;             //显示4
      4'h5:seg = 8'h92;             //显示5
      4'h6:seg = 8'h82;             //显示6
      4'h7:seg = 8'hf8;             //显示7
      4'h8:seg = 8'h80;             //显示8
      4'h9:seg = 8'h90;             //显示9
      4'ha:seg = 8'h88;             //显示a
      4'hb:seg = 8'h83;             //显示b
      4'hc:seg = 8'hc6;             //显示c
      4'hd:seg = 8'ha1;             //显示d
      4'he:seg = 8'h86;             //显示e
      4'hf:seg = 8'h8e;             //显示f
endcase
end

endmodule

fanichicl · 发表于 2019-5-8 17:56

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EDA实验与实践 uart_test

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