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  • 【iCore4 双核心板_FPGA】例程一:GPIO输出实验——点亮LED

    实验现象:

    三色LED循环点亮。

    核心源代码:

    module led_ctrl(
        input clk_25m,
        input rst_n,
        output fpga_ledr,
        output fpga_ledg,
        output fpga_ledb
    );
    
    //--------------------cnt----------------------------------//
    reg [24:0]cnt;
    reg [2:0]led_cnt;
    
    always @ (posedge clk_25m or negedge rst_n)
        if(!rst_n)
            begin
                cnt <= 25'd0;
                led_cnt <= 1'd0;
            end
        else if(cnt == 25'd5000000)
            begin
                cnt <= 25'd0;
                if(led_cnt == 3'd2)
                    led_cnt <= 3'd0;
                else 
                    led_cnt <= led_cnt + 1'd1;
            end        
        else
            begin
                cnt <= cnt + 1'd1;
            end
        
    //--------------------led_ctrl----------------------------//
    /*led状态切换状态机*/
    reg ledr,ledg,ledb;
    
    always @ (posedge clk_25m or negedge rst_n)
        if(!rst_n)
            begin
                ledr <= 1'd1;
                ledg <= 1'd1;
                ledb <= 1'd1;
            end
        else 
            case(led_cnt)                        
                3'd0:                                //红灯亮
                    begin
                        ledr <= 1'd0;
                        ledg <= 1'd1;
                        ledb <= 1'd1;
                    end
                3'd1:                                //绿灯亮
                    begin
                        ledr <= 1'd1;
                        ledg <= 1'd0;
                        ledb <= 1'd1;
                    end
                3'd2:                                //蓝灯亮
                    begin
                        ledr <= 1'd1;
                        ledg <= 1'd1;
                        ledb <= 1'd0;
                    end
                    default:                        //都不亮
                    begin
                        ledr <= 1'd1;
                        ledg <= 1'd1;
                        ledb <= 1'd1;
                    end
            endcase
    
    assign {fpga_ledr,fpga_ledg,fpga_ledb}    = {ledr,ledg,ledb};    
    
    //--------------------endmodule---------------------------//
    endmodule

    源代码下载链接:

    链接:http://pan.baidu.com/s/1nu74Iy1 密码:dz3y

    iCore4链接:

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  • 原文地址:https://www.cnblogs.com/xiaomagee/p/7266617.html
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