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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] |
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### 9. 参考文档 | ### 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}} | * {{: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> | ||