开发板上有一排LED灯,共26个,LEDR17-LEDR0-LEDG7-LEDG0;
实现以1s间隔从左至右流,循环不断~
完整代码如下(用的依旧是自动生成的模板):
//======================================================= // This code is generated by Terasic System Builder //======================================================= module LED_Test( //////////// CLOCK ////////// CLOCK_50, RSTn, //////////// LED ////////// LEDG, LEDR ); //======================================================= // PORT declarations //======================================================= //////////// CLOCK ////////// input CLOCK_50; input RSTn; //////////// LED ////////// output [8:0] LEDG; output [17:0] LEDR; //======================================================= // Structural coding //=======================================================
//-----------------------定时器模板--------------------------
//----1MS定时器
parameter T1MS = 16'd49_999; reg [15:0] Count1; always@(posedge CLOCK_50 or negedge RSTn) if(!RSTn) Count1 <= 16'd0; else if(Count1 == T1MS) Count1 <= 16'd0; else Count1 <= Count1 + 1'b1; //----1S定时器 reg [9:0] Count_MS; always@(posedge CLOCK_50 or negedge RSTn) if(!RSTn) Count_MS <= 10'd0; else if(Count_MS == 16'd1000) Count_MS <= 10'd0; else if(Count1 == T1MS) Count_MS <= Count_MS + 1'b1;
//----------------------------------------------------------
//---------------------流水灯实现--------------------------- reg [26:0] rLED; always@(posedge CLOCK_50 or negedge RSTn) if(!RSTn) rLED <= 27'b1000_0000_0000_0000_0000_0000_00; else if(Count_MS == 16'd1000) begin if(rLED == 27'b0000_0000_0000_0000_0000_0000_001) //首尾交接处 rLED <= 27'b1000_0000_0000_0000_0000_0000_000; else if(rLED == 27'b0000_0000_0000_0000_0100_0000_000) //红绿LED交接处 rLED <= 27'b0000_0000_0000_0000_0001_0000_000; else rLED <= {1'b0,rLED[26:1]}; end
//-----------------------------------------------------------------
// 输出赋值 assign LEDR = rLED[26:9]; assign LEDG = {1'b0,rLED[7:0]}; //由于LEDG8跟它们一排LED不在同一排,所以就分出来置零好了 endmodule