想让两个数码管0-F循环点亮,数码管点亮顺序是0-5-6-。。。-F-1-2-3,可能出问题在哪了,求指导`timescale 1ns / 1ps
module led_seg7_3(
clk,rst_n,
sm_cs1_n,sm_cs2_n,
sm_db
);
input clk; //时钟 50MHZ
input rst_n;
output sm_cs1_n,sm_cs2_n;
output[6:0] sm_db;//7段数码管(不包括小数点)
reg[24:0] cnt;//计数器,最大可以计数到2的25次方*20ns=640ms
always @ (posedge clk or negedge rst_n)
if(!rst_n) cnt <= 25`d0;
else cnt <= cnt+1`b1;
reg[3:0] num; //显示数值
always @ (posedge clk or negedge rst_n)
if(!rst_n) num <= 4`d0;
else if (cnt == 24`hfffff) num <= num+1`b1; //每640ms增一
//-------------------------------------------------------------------------------
/* 共阴极 :不带小数点
;0, 1, 2, 3, 4, 5, 6, 7,
db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h
;8, 9, a, b, c, d, e, f , 灭
db 7fh,6fh,77h,7ch,39h,5eh,79h,71h,00h*/
/* 共阳极 :不带小数点
;0, 1, 2, 3, 4, 5, 6, 7,
db c0h,f9h,a4h,b0h,99h,92h,82h,f8h
;8, 9, a, b, c, d, e, f , 灭
db 80h,90h,88h,83h,c6h,a1h,86h,8eh,ffh*/
parameter
seg0 = 7'hc0,
seg1 = 7'hf9,
seg2 = 7'ha4,
seg3 = 7'hb0,
seg4 = 7'h99,
seg5 = 7'h92,
seg6 = 7'h82,
seg7 = 7'hf8,
seg8 = 7'h80,
seg9 = 7'h90,
sega = 7'h88,
segb = 7'h83,
segc = 7'hc6,
segd = 7'ha1,
sege = 7'h86,
segf = 7'h8e;
reg[6:0] sm_dbr;
always @ (num)
case (num)
4`h0: sm_dbr <= seg0;
4'h1: sm_dbr <= seg1;
4'h2: sm_dbr <= seg2;
4'h3: sm_dbr <= seg3;
4'h4: sm_dbr <= seg4;
4'h5: sm_dbr <= seg5;
4'h6: sm_dbr <= seg6;
4'h7: sm_dbr <= seg7;
4'h8: sm_dbr <= seg8;
4'h9: sm_dbr <= seg9;
4'ha: sm_dbr <= sega;
4'hb: sm_dbr <= segb;
4'hc: sm_dbr <= segc;
4'hd: sm_dbr <= segd;
4'he: sm_dbr <= sege;
4'hf: sm_dbr <= segf;
default: ;
endcase
assign sm_db = sm_dbr;
assign sm_cs1_n = 1'b0; //数码管1常开
assign sm_cs2_n = 1'b0; //数码管2常开
endmodule