FPGA之静态数码管_fpga静态数码管显示

实现代码：
seg_led_static.v

module	seg_led_static(
	input		      clk     ,
	input		      rst_n   ,
	input		      flag    ,
	output	reg [5:0] sel     ,//数码管位选信号
	output	reg [7:0] seg  //数码管段选信号
);
reg [3:0]	num;//数码管显示十六进制数
//控制数码管位选信号(注:低电平有效),选中所有的数码管
always @(posedge clk or negedge rst_n)begin
	if(!rst_n)//如果按复位键0
		sel <= 6'b111111;//则默认为高电平
	else 
		sel <= 6'b000000;//否则为低电平
end
//每次通知信号flag到达时，数码管计数加1
always @(posedge clk or negedge rst_n)begin
	if(!rst_n)
		num <=	4'h0;
	else if(flag)begin
		if(num < 4'hf)
			num <= num + 1'h1;
		else 
			num <= 4'h0;
	end
	else begin
		num <= num;
	end
end
//根据数码管显示的数值，控制段选信号
always @(posedge clk or negedge rst_n)begin
	if(!rst_n)
		seg <= 8'b0;
	else begin
		case(num)//匹配16进制数
			4'h0:    seg <= 8'b1100_0000;//匹配到后参考共阳极真值表
	        4'h1:    seg <= 8'b1111_1001;
	        4'h2:    seg <= 8'b1010_0100;
	        4'h3:    seg <= 8'b1011_0000;
	        4'h4:    seg <= 8'b1001_1001;
	        4'h5:    seg <= 8'b1001_0010;
	        4'h6:    seg <= 8'b1000_0010;
	        4'h7:    seg <= 8'b1111_1000;
	        4'h8:    seg <= 8'b1000_0000;
	        4'h9:    seg <= 8'b1001_0000;
	        4'ha:    seg <= 8'b1000_1000;
	        4'hb:    seg <= 8'b1000_0011;
	        4'hc:    seg <= 8'b1100_0110;
	        4'hd:    seg <= 8'b1010_0001;
	        4'he:    seg <= 8'b1000_0110;
	        4'hf:     seg <= 8'b1000_1110;
	      	default : seg <= 8'b1100_0000;
		endcase
	end
end
endmodule 

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time_count.v

module time_count(
	input	     clk  ,//50MHz时钟信号
	input		 rst_n,//复位信号
	output	reg  flag//一个时钟周期的脉冲信号
);
parameter	 MAX_NUM = 25'd25_000_000;//计数器最大计数值
reg  [24:0]	 cnt                     ; //时钟分频计数器

//计数器对时钟计数，每0.5s，输出一个时钟周期脉冲信号
always @(posedge clk or negedge rst_n)begin
	if(!rst_n)begin//按复位时
		flag <= 1'b0;//信号为0
		cnt <= 25'd0;//计数器清零
	end
	else if(cnt < MAX_NUM - 1'b1)begin//如果没到时间
		flag <= 1'b0;//信号为0
		cnt <= cnt + 1'b1;//计数器正常累计+1
	end
	else	begin //否则到时间
		flag <= 1'b1;//信号变为1
		cnt <= 25'd0;
	end
end
endmodule 

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top_seg_led_static.v

module  top_seg_led_static(
	input	 	         clk  ,//50MHz系统时钟
	input		         rst_n,//系统复位信号(低有效)
	output		[5:0]	 sel  ,//数码管位选
	output	    [7:0]	 seg//数码管段选
);
 
parameter	MAX_NUM = 25'd25_000_000;// 数码管变化的时间间隔0.5s
wire		add_flag				;// 数码管变化的通知信号
//每隔0.5s产生一个时钟周期的脉冲信号
time_count #(.MAX_NUM(MAX_NUM)) u_time_count(
	.clk		(clk)  ,//50MHz时钟信号
	.rst_n		(rst_n),//复位信号
	.flag		(add_flag)//一个时钟周期的脉冲信号
);
//每当脉冲信号到达时，使数码管显示的数值加1
seg_led_static u_seg_led_static(
	.clk		(clk)	  ,
	.rst_n		(rst_n)	  ,
	.flag	    (add_flag),
	.sel		(sel)	  ,
	.seg		(seg)
);
endmodule 

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