MAX7219驱动数码管的代码，C语言有大把的代码参考，实现的原理这里我就不细说了，其他博主说得很详细，但是Verilog的代码并没有很多，因此，这里我封装好了代码，仅需根据自己的需要去配置就可以

module nixie_tude(input               sys_clk  ,  //系统时钟input               sys_rst_n,  //系统复位，低电平有效input	wire	[3:0]	switch_1,input	wire	[3:0]	switch_2,input	wire	[3:0]	switch_3,input	wire	[3:0]	switch_4,input	wire	[3:0]	switch_5,input	wire	[3:0]	switch_6,input	wire	[3:0]	switch_7,input	wire	[3:0]	switch_8,output	reg	o_cs,		//片选output	reg	o_clk,		//时钟output	reg	o_din,		//数据);reg	[31:0] 		counter;		//计数器
reg	[7:0]		spi_state;		//状态标志
reg	[15:0]		data;			//数据
reg	[7:0] 		flag;			//数据标志reg [7:0] switch_1_q;
reg [7:0] switch_2_q;
reg [7:0] switch_3_q;
reg [7:0] switch_4_q;
reg [7:0] switch_5_q;
reg [7:0] switch_6_q;
reg [7:0] switch_7_q;
reg [7:0] switch_8_q;always @(posedge sys_clk or negedge sys_rst_n) beginif(!sys_rst_n)beginswitch_1_q <= 8'h00;switch_2_q <= 8'h00;switch_3_q <= 8'h00;switch_4_q <= 8'h00;switch_5_q <= 8'h00;switch_6_q <= 8'h00;switch_7_q <= 8'h00;switch_8_q <= 8'h00;endelsebegin			case(switch_1)4'h0 : switch_1_q <= 8'h7e;4'h1 : switch_1_q <= 8'h30;4'h2 : switch_1_q <= 8'h6d;4'h3 : switch_1_q <= 8'h79;4'h4 : switch_1_q <= 8'h33;4'h5 : switch_1_q <= 8'h5b;4'h6 : switch_1_q <= 8'h5f;4'h7 : switch_1_q <= 8'h70;4'h8 : switch_1_q <= 8'h7f;4'h9 : switch_1_q <= 8'h7b;4'ha : switch_1_q <= 8'h77;4'hb : switch_1_q <= 8'h1f;4'hc : switch_1_q <= 8'h4e;4'hd : switch_1_q <= 8'h3d;4'he : switch_1_q <= 8'h4f;4'hf : switch_1_q <= 8'h47;endcase	case(switch_2)4'h0 : switch_2_q <= 8'h7e;4'h1 : switch_2_q <= 8'h30;4'h2 : switch_2_q <= 8'h6d;4'h3 : switch_2_q <= 8'h79;4'h4 : switch_2_q <= 8'h33;4'h5 : switch_2_q <= 8'h5b;4'h6 : switch_2_q <= 8'h5f;4'h7 : switch_2_q <= 8'h70;4'h8 : switch_2_q <= 8'h7f;4'h9 : switch_2_q <= 8'h7b;4'ha : switch_2_q <= 8'h77;4'hb : switch_2_q <= 8'h1f;4'hc : switch_2_q <= 8'h4e;4'hd : switch_2_q <= 8'h3d;4'he : switch_2_q <= 8'h4f;4'hf : switch_2_q <= 8'h47;endcasecase(switch_3)4'h0 : switch_3_q <= 8'h7e;4'h1 : switch_3_q <= 8'h30;4'h2 : switch_3_q <= 8'h6d;4'h3 : switch_3_q <= 8'h79;4'h4 : switch_3_q <= 8'h33;4'h5 : switch_3_q <= 8'h5b;4'h6 : switch_3_q <= 8'h5f;4'h7 : switch_3_q <= 8'h70;4'h8 : switch_3_q <= 8'h7f;4'h9 : switch_3_q <= 8'h7b;4'ha : switch_3_q <= 8'h77;4'hb : switch_3_q <= 8'h1f;4'hc : switch_3_q <= 8'h4e;4'hd : switch_3_q <= 8'h3d;4'he : switch_3_q <= 8'h4f;4'hf : switch_3_q <= 8'h47;endcasecase(switch_4)4'h0 : switch_4_q <= 8'h7e;4'h1 : switch_4_q <= 8'h30;4'h2 : switch_4_q <= 8'h6d;4'h3 : switch_4_q <= 8'h79;4'h4 : switch_4_q <= 8'h33;4'h5 : switch_4_q <= 8'h5b;4'h6 : switch_4_q <= 8'h5f;4'h7 : switch_4_q <= 8'h70;4'h8 : switch_4_q <= 8'h7f;4'h9 : switch_4_q <= 8'h7b;4'ha : switch_4_q <= 8'h77;4'hb : switch_4_q <= 8'h1f;4'hc : switch_4_q <= 8'h4e;4'hd : switch_4_q <= 8'h3d;4'he : switch_4_q <= 8'h4f;4'hf : switch_4_q <= 8'h47;endcase	case(switch_5)4'h0 : switch_5_q <= 8'h7e;4'h1 : switch_5_q <= 8'h30;4'h2 : switch_5_q <= 8'h6d;4'h3 : switch_5_q <= 8'h79;4'h4 : switch_5_q <= 8'h33;4'h5 : switch_5_q <= 8'h5b;4'h6 : switch_5_q <= 8'h5f;4'h7 : switch_5_q <= 8'h70;4'h8 : switch_5_q <= 8'h7f;4'h9 : switch_5_q <= 8'h7b;4'ha : switch_5_q <= 8'h77;4'hb : switch_5_q <= 8'h1f;4'hc : switch_5_q <= 8'h4e;4'hd : switch_5_q <= 8'h3d;4'he : switch_5_q <= 8'h4f;4'hf : switch_5_q <= 8'h47;endcase	case(switch_6)4'h0 : switch_6_q <= 8'h7e;4'h1 : switch_6_q <= 8'h30;4'h2 : switch_6_q <= 8'h6d;4'h3 : switch_6_q <= 8'h79;4'h4 : switch_6_q <= 8'h33;4'h5 : switch_6_q <= 8'h5b;4'h6 : switch_6_q <= 8'h5f;4'h7 : switch_6_q <= 8'h70;4'h8 : switch_6_q <= 8'h7f;4'h9 : switch_6_q <= 8'h7b;4'ha : switch_6_q <= 8'h77;4'hb : switch_6_q <= 8'h1f;4'hc : switch_6_q <= 8'h4e;4'hd : switch_6_q <= 8'h3d;4'he : switch_6_q <= 8'h4f;4'hf : switch_6_q <= 8'h47;endcasecase(switch_7)4'h0 : switch_7_q <= 8'h7e;4'h1 : switch_7_q <= 8'h30;4'h2 : switch_7_q <= 8'h6d;4'h3 : switch_7_q <= 8'h79;4'h4 : switch_7_q <= 8'h33;4'h5 : switch_7_q <= 8'h5b;4'h6 : switch_7_q <= 8'h5f;4'h7 : switch_7_q <= 8'h70;4'h8 : switch_7_q <= 8'h7f;4'h9 : switch_7_q <= 8'h7b;4'ha : switch_7_q <= 8'h77;4'hb : switch_7_q <= 8'h1f;4'hc : switch_7_q <= 8'h4e;4'hd : switch_7_q <= 8'h3d;4'he : switch_7_q <= 8'h4f;4'hf : switch_7_q <= 8'h47;endcasecase(switch_8)4'h0 : switch_8_q <= 8'h7e;4'h1 : switch_8_q <= 8'h30;4'h2 : switch_8_q <= 8'h6d;4'h3 : switch_8_q <= 8'h79;4'h4 : switch_8_q <= 8'h33;4'h5 : switch_8_q <= 8'h5b;4'h6 : switch_8_q <= 8'h5f;4'h7 : switch_8_q <= 8'h70;4'h8 : switch_8_q <= 8'h7f;4'h9 : switch_8_q <= 8'h7b;4'ha : switch_8_q <= 8'h77;4'hb : switch_8_q <= 8'h1f;4'hc : switch_8_q <= 8'h4e;4'hd : switch_8_q <= 8'h3d;4'he : switch_8_q <= 8'h4f;4'hf : switch_8_q <= 8'h47;endcaseend
endalways @(posedge sys_clk or negedge sys_rst_n) beginif(!sys_rst_n)begino_cs <= 1'b1;o_clk <= 1'b0;o_din <= 1'b0;spi_state <= 7'd0;data <= 16'hffff;flag <= 7'd0;counter <= 32'd0;endelse begin//if(spi_state == 7'd0)beginif(flag == 7'd0)data <= 16'h0900;else if(flag == 7'd1)data <= 16'h0a03;else if(flag == 7'd2)data <= 16'h0b07;else if(flag == 7'd3)data <= 16'h0c01;else if(flag == 7'd4)data <= 16'h0f00;						else if(flag == 7'd5)data <= ((16'h01<<8)+ switch_1_q);			else if(flag == 7'd6)data <= ((16'h02<<8)+ switch_2_q); else if(flag == 7'd7)data <= ((16'h03<<8)+ switch_3_q); else if(flag == 7'd8)data <= ((16'h04<<8)+ switch_4_q); else if(flag == 7'd9)data <= ((16'h05<<8)+ switch_5_q);else if(flag == 7'd10)data <= ((16'h06<<8)+ switch_6_q);else if(flag == 7'd11)data <= ((16'h07<<8)+ switch_7_q);else if(flag == 7'd12)data <= ((16'h08<<8)+ switch_8_q);if(counter==32'd1000)begino_cs <= 1'b0;o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end endelse if(spi_state == 7'd1)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  end//else if(spi_state == 7'd2)beginif(counter==32'd1000)begin			o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd3)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd4)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd5)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd6)beginif(counter==32'd1000)begin							o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd7)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd8)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd9)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd10)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd11)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd12)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd13)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd14)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd15)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd16)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd17)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd18)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd19)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd20)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd21)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd22)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd23)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd24)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd25)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd26)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd27)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd28)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd29)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd30)beginif(counter==32'd1000)begin				o_clk <= 1'b0;if((data & 16'h8000)>>15)o_din <= 1'b1;elseo_din <= 1'b0;	spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd31)beginif(counter==32'd1000)begino_clk <= 1'b1;data <= data * 2;spi_state <= spi_state + 7'd1;  counter <= 32'd0;endelsebegincounter <= counter + 1'b1;end  endelse if(spi_state == 7'd32)begino_cs <= 1'b1;data <= 16'hffff;				if(flag < 8'd12)flag <= flag + 1'b1;elseflag <= 1'b0;spi_state <= 7'd0;endend
endendmodule