always @(posedge clk_1Hz,posedge button)报错

这个报错可能是因为在Verilog语法中，always块的敏感列表（即括号中的posedge clk_1Hz,posedge button）只能包含时钟信号，而不能包含其他类型的信号，如按钮。如果您想使用按钮来触发always块中的代码，请使用edge关键字，如下所示：

always @(posedge clk_1Hz, posedge button)
begin
  if (button == 1'b1)
    // your code here
end

这段代码将在1Hz时钟上升沿和按钮边缘（即从0到1或从1到0的变化）时执行。

相关问题

module traffic_light( input rst, input clk_a, input button, output [2:0]LED ); wire clk_a; wire button; reg [2:0]LED; reg [1:0]state; reg clk; reg [21:0]clk_count; reg [6:0]green_count; reg [8:0]red_count; always @(posedge clk_a) begin if(rst) begin clk_count <= 22'd0; clk <= 1'b0; end else begin //3125000 if(clk_count >= 22'b10_1111_1010_1111_0000_0111) begin clk_count <= 22'd0; clk <= ~clk; end else begin clk_count <= clk_count + 1; clk <= clk; end end end always @(posedge clk) begin if(rst) begin state <= 0; end else begin case(state) 2'd0 : begin if(!button) state <= 2'd1; else state <= 2'd0; end 2'd1 : begin if(green_count == 7'b111_1110) //127 state <= 2'd2; else state <= 2'd1; end 2'd2 : begin if(red_count == 9'b1_1101_1110) //479 state <= 2'd0; else state <= 2'd2; end endcase end end always@(posedge clk) begin if(rst) begin LED <= 3'b000; green_count <= 6'd0; red_count <= 9'd0; end else begin case(state) 2'd0 : begin LED <= ~LED; green_count <= 6'd0; red_count <= 9'd0; end 2'd1: begin green_count <= green_count + 1; LED <= ~green_count[6:4]; end 2'd2:begin LED <= ~LED; red_count <= red_count + 1; end endcase end end endmodule

这是一个 Verilog 代码模块，实现了一个红绿灯控制器。具体来说，当按钮被按下后，红灯亮，持续一段时间后变为绿灯亮，再经过一段时间后变为红灯亮，周而复始。如果需要进一步了解代码作用和实现细节，建议查阅相关的技术文献或者咨询相关专业人士。

module liushui(clk, rst, led,ctrl); input clk; input rst; input ctrl; output [7 : 0] led; parameter WIDTH =27; parameter COUNT = 99_999_999; reg [WIDTH - 1 : 0] cnt; reg [7 : 0] light; reg flag; always @(posedge clk) begin if (!rst) cnt <= 0; else if (cnt == COUNT) cnt <= 0; else if(ctrl) cnt<=cnt; else cnt <= cnt + 1; end always @(posedge clk) begin if (light == 8'h01) flag <= 1; //left move else if (light == 8'h80) flag <= 0; //rihgt move else ; end always @(posedge clk) begin if (!rst) light <= 8'h01; else if (cnt == COUNT) begin if(ctrl) light<=light; else if (flag) light <= light << 1; else light <= light >> 1; end else ; end assign led = light; endmodule修改代码，添加一个按键，使按键为1时流水灯能够单向运行

可以添加一个输入端口 button，用来输入按键信号。当 button 为 1 时，流水灯单向循环运行；否则，流水灯双向循环运行。修改后的代码如下：

module liushui(clk, rst, led, button);
    input clk;
    input rst;
    input button;
    output [7:0] led;
    
    parameter WIDTH = 27;
    parameter COUNT = 99_999_999;
    
    reg [WIDTH - 1:0] cnt;
    reg [7:0] light;
    reg [1:0] dir; // 0: right, 1: left
    
    always @(posedge clk) begin
        if (!rst)
            cnt <= 0;
        else if (cnt == COUNT)
            cnt <= 0;
        else if (button)
            cnt <= cnt;
        else
            cnt <= cnt + 1;
    end
    
    always @(posedge clk) begin
        if (light == 8'h01) // left move
            dir <= 1;
        else if (light == 8'h80) // right move
            dir <= 0;
    end
    
    always @(posedge clk) begin
        if (!rst)
            light <= 8'h01;
        else if (cnt == COUNT)
            if (button)
                if (dir)
                    light <= light << 1; // left move
                else
                    light <= light >> 1; // right move
            else
                if (dir)
                    light <= light << 1; // left move
                else if (light == 8'h80)
                    light <= 8'h01; // reset to 8'h01
                else
                    light <= light >> 1; // right move
    end
    
    assign led = light;
    
endmodule