【iCore1S 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-----------------------------//
module LED(
    input CLK_12M,
    output FPGA_LEDR,
    output FPGA_LEDG,
    output FPGA_LEDB
);
//----------------------rst_n---------------------------------//
    reg rst_n;
    reg [:]cnt_rst;

    always@(posedge CLK_12M)
        if(cnt_rst==)
            begin
                rst_n <= 'd1;
            end
        else cnt_rst <= cnt_rst + 'd1;

//--------------------led_cnt-------------------------------//
    reg [:]cnt;

    always @ (posedge CLK_12M or negedge rst_n)
        if(!rst_n)
            begin
                cnt <= 'd0;
            end
        else
            begin
                if(cnt == 'd60000000)
                    cnt <= 'd0;
                else
                    cnt <= cnt + 'd1;
            end

//--------------------led----------------------------------//
    reg ledr,ledg,ledb;

    always @ (posedge CLK_12M or negedge rst_n)
        begin
            if(!rst_n)
                begin
                    ledr <= 'd1;
                    ledg <= 'd1;
                    ledb <= 'd1;
                end
            else if(((cnt > ) || (cnt == )) &&  ((cnt < 'd20000000) || (cnt == 28'd20000000)))
                begin
                    ledr <= 'd0;
                    ledg <= 'd1;
                    ledb <= 'd1;
                end
            else if((cnt > 'd20000000) &&  ((cnt < 28'd40000000) || (cnt == 'd40000000)))
                begin
                    ledr <= 'd1;
                    ledg <= 'd0;
                    ledb <= 'd1;
                end
            else
                begin
                    ledr <= 'd1;
                    ledg <= 'd1;
                    ledb <= 'd0;
                end
        end

    assign FPGA_LEDR = ledr;
    assign FPGA_LEDG = ledg;
    assign FPGA_LEDB = ledb;

//--------------------endmodule-----------------------------//
endmodule 

代码包下载：

链接：http://pan.baidu.com/s/1jHVWIIM 密码：wlwy