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本帖最后由 HDL 于 2023-1-24 19:20 编辑
- `define fosc 50000000 //晶振频率(单位HZ)
- `define leap_year(y) (((y)%4 == 0 && (y)%100 != 0) || (y)%400 == 0) //是否闰年?
- module DateTimeSystem( //日期时间计时系统模块
- input clk_1khz, //1Khz时钟输入
- input set, //是否设置日期时间 高电平:设置 低电平:计时
- //数值必须在规定的范围内 (没有任何校验,否则计时将出错)
- input [13:0] s_y, //(设置)年 0~9999
- input [3:0] s_m, //(设置)月 1~12
- input [4:0] s_d, //(设置)日 1~31
- input [4:0] s_h, //(设置)小时 0~23
- input [5:0] s_i, //(设置)分钟 0~59
- input [5:0] s_s, //(设置)秒 0~59
- input [9:0] s_ms, //(设置)毫秒 0~999
- input [2:0] s_w, //(设置)星期 1~7 (不支持自动计算,需手动设定)
-
- output reg [13:0] y, //年 0~9999
- output reg [3:0] m, //月 1~12
- output reg [4:0] d, //日 1~31
- output reg [4:0] h, //小时 0~23
- output reg [5:0] i, //分钟 0~59
- output reg [5:0] s, //秒 0~59
- output reg [9:0] ms, //毫秒 0~999
- output reg [2:0] w //星期 1~7
- );
- initial begin
- y = 14'd0;
- m = 4'd1;
- d = 5'd1;
- h = 5'd0;
- i = 6'd0;
- s = 6'd0;
- ms = 10'd0;
- w = 3'd1;
- end
- function [4:0] ym2d; //已知年月 获取该月有多少天
- input [13:0] y;
- input [3:0] m;
- begin
- case(m)
- 1:ym2d = 5'd31;
- 2:ym2d = `leap_year(y) ? 5'd29 : 5'd28;
- 3:ym2d = 5'd31;
- 4:ym2d = 5'd30;
- 5:ym2d = 5'd31;
- 6:ym2d = 5'd30;
- 7:ym2d = 5'd31;
- 8:ym2d = 5'd31;
- 9:ym2d = 5'd30;
- 10:ym2d = 5'd31;
- 11:ym2d = 5'd30;
- 12:ym2d = 5'd31;
- default:ym2d = 5'd0;
- endcase
- end
- endfunction
- wire [4:0] dd = ym2d(y,m);
- always @(posedge clk_1khz or posedge set) begin
- if(set) begin //设置日期时间
- {y,m,d,h,i,s,ms,w} = {s_y,s_m,s_d,s_h,s_i,s_s,s_ms,s_w};
- end else begin //走时
- ms = ms + 1'd1;
- if(ms > 999) begin
- ms = 1'd0;
- s = s + 1'd1;
- if(s > 59) begin
- s = 1'd0;
- i = i + 1'd1;
- if(i > 59) begin
- i = 1'd0;
- h = h + 1'd1;
- if(h > 23) begin
- h = 1'd0;
- w = w + 1'd1;
- if(w == 0) begin
- w = 1'd1;
- end
- d = d + 1'd1;
- if((dd == 31) ? (d == 0) : (d > dd)) begin
- d = 1'd1;
- m = m + 1'd1;
- if(m > 12) begin
- m = 1'd1;
- y = y + 1'd1;
- if(y > 9999) begin
- y = 1'd0;
- end
- end
- end
- end
- end
- end
- end
- end
- end
- endmodule
- module main(
- input clk,
- output led
- );
- wire [13:0] y; //年 0~9999
- wire [3:0] m; //月 1~12
- wire [4:0] d; //日 1~31
- wire [4:0] h; //小时 0~23
- wire [5:0] i; //分钟 0~59
- wire [5:0] s; //秒 0~59
- wire [9:0] ms; //毫秒 0~999
- wire [2:0] w; //星期 1~7
- integer clk_1khz_count = 0; //1Khz分频计数器
- reg clk_1khz; //1Khz时钟信号
- always @(posedge clk) begin
- clk_1khz_count = clk_1khz_count + 1;
- if(clk_1khz_count >= `fosc/1000/2) begin
- clk_1khz_count = 0;
- clk_1khz <= !clk_1khz;
- end
- end
- DateTimeSystem DateTimeSystem(
- .clk_1khz(clk_1khz),
- .set(1'd0),
- .s_y(),
- .s_m(),
- .s_d(),
- .s_h(),
- .s_i(),
- .s_s(),
- .s_ms(10'd0),
- .s_w(),
- .y(y),
- .m(m),
- .d(d),
- .h(h),
- .i(i),
- .s(s),
- .ms(ms),
- .w(w)
- );
- assign led = (ms >= 500);
- endmodule
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