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--- breath_led [2021/09/13 01:46]
gongyu 创建
+++ breath_led [2021/09/13 10:56] (当前版本)
gongyu [9. 参考文档]
@@ 行 111: / 行 111: @@
 ### 9. 参考文档
-  * [[脉冲发生器]]
+  * [[pulse_gen|脉冲发生器]]
   * {{:machxo2familydatasheet.pdf|Lattice MachXO2数据手册}}
-### 10. 相关文档
+### 10. 参考代码
+#### 10.1 呼吸灯代码：
+代码附件 - [[Breath_led.v|呼吸灯verilog代码]]
+<code verilog>
+// --------------------------------------------------------------------
+// >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
+// --------------------------------------------------------------------
+// Module: Breath_led
+//
+// Author: Step
+//
+// Description: PWM-Breath_led
+//
+// Web: www.ecbcamp.com
+//
+// --------------------------------------------------------------------
+// Code Revision History :
+// --------------------------------------------------------------------
+// Version: |Mod. Date:   |Changes Made:
+// V1.0     |2015/11/11   |Initial ver
+// --------------------------------------------------------------------
+module Breath_led #
+(
+parameter	CNT_NUM = 5000	//period = (5000^2)*2 = 50000000 = 2s
+)
+(
+input		clk_in,			//system clk
+input		rst_n_in,			//system reset
+output		Breath_led		//Breath led output
+);
-^ **文件名称**  | **功能** |
+reg	[12:0]	cnt1;
-^ **[[Breath_led.v]]** | **呼吸灯** |
+//generate cnt1 signal
-^ **[[Breath_led_test.v]]** | **测试文件** |
+always@(posedge clk_in or negedge rst_n_in) begin
+	if(!rst_n_in) begin
+		cnt1<=13'd0;
+	end else begin
+		if(cnt1>=CNT_NUM-1) cnt1<=1'b0;
+		else cnt1<=cnt1+1'b1;
+	end
+end
+reg	flag;
+reg	[12:0]	cnt2;
+//generate cnt2 signal
+always@(posedge clk_in or negedge rst_n_in) begin
+	if(!rst_n_in) begin
+		cnt2<=13'd0;
+		flag<=1'b0;
+	end else begin
+		if(cnt1==CNT_NUM-1) begin
+			if(!flag) begin
+				if(cnt2>=CNT_NUM-1) flag<=1'b1;
+				else cnt2<=cnt2+1'b1;
+			end else begin
+				if(cnt2<=0) flag<=1'b0;
+				else cnt2<=cnt2-1'b1;
+			end
+		end else cnt2<=cnt2;
+	end
+end
+//Compare cnt1 and cnt2, generate PWM-Breath-led
+assign	Breath_led = (cnt1<cnt2)?1'b0:1'b1;
+endmodule
+</code>
+#### 10.2 呼吸灯测试代码
+代码附件：[[Breath_led_test.v|呼吸灯测试代码]]
+<code verilog>
+// --------------------------------------------------------------------
+// >>>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
+// --------------------------------------------------------------------
+// Module: Breath_led_test
+//
+// Author: Step
+//
+// Description: Testbench for Water_led
+//
+// Web: www.ecbcamp.com
+//
+// --------------------------------------------------------------------
+// Code Revision History :
+// --------------------------------------------------------------------
+// Version: |Mod. Date:   |Changes Made:
+// V1.0     |2015/11/11   |Initial ver
+// --------------------------------------------------------------------
+`timescale 1ns / 100ps
+module Breath_led_test;
+parameter CLK_PERIOD = 40;  //CLK_PERIOD=40ns, Frequency=25MHz
+parameter CNT_NUM = 6;
+reg sys_clk;
+initial
+	sys_clk = 1'b0;
+always
+	sys_clk = #(CLK_PERIOD/2) ~sys_clk;
+reg sys_rst_n;  //active low
+initial
+	begin
+		sys_rst_n = 1'b0;
+		#100;
+		sys_rst_n = 1'b1;
+	end
+wire Breath_led;
+Breath_led #(.CNT_NUM(CNT_NUM))
+Breath_led_uut
+(
+.clk_in(sys_clk),
+.rst_n_in(sys_rst_n),
+.Breath_led(Breath_led)
+);
+endmodule
+</code>