From 563a00e8d9944a1c7e073383b0694a2e63d4b032 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=98=B3=E5=85=89=E5=B0=91=E5=B9=B4?= <849317537@qq.com>
Date: Tue, 14 May 2024 18:56:59 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BB=BF=E7=9C=9F=E6=88=90=E5=8A=9F?=
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---
 led_matrix/{tb_lm.v => tb_lm_1.v} |   0
 led_matrix/tb_lm_2.v              | 135 ++++++++++++++++++++++++++++++
 2 files changed, 135 insertions(+)
 rename led_matrix/{tb_lm.v => tb_lm_1.v} (100%)
 create mode 100644 led_matrix/tb_lm_2.v

diff --git a/led_matrix/tb_lm.v b/led_matrix/tb_lm_1.v
similarity index 100%
rename from led_matrix/tb_lm.v
rename to led_matrix/tb_lm_1.v
diff --git a/led_matrix/tb_lm_2.v b/led_matrix/tb_lm_2.v
new file mode 100644
index 0000000..cd711c6
--- /dev/null
+++ b/led_matrix/tb_lm_2.v
@@ -0,0 +1,135 @@
+`timescale 1ns/1ns
+
+module tb_lm();
+
+reg k_1;  // 显示的图像1
+reg k_2;  // 显示的图像2
+
+reg key;  // 物理按键 开关显示, 该按键异步的, 每次按下 等于
+
+reg key_1;  // 物理按键的随时钟同步变化信号
+reg key_2;  // 
+reg is_show;  // 互斥变化的
+
+reg flag;  // 状态改变周期 现在500ns改变一次状态, 显示相反的图像
+
+reg sys_clk;
+reg sys_rst;
+
+
+always #10 sys_clk = ~sys_clk;
+
+initial begin
+    sys_clk <= 1'b0;
+    sys_rst <= 1'b0;
+    #200
+    sys_rst <= 1'b1;
+
+    // 延迟2000纳秒, 现在x 应该是0
+    #2000
+
+    // 按下一次key, 持续188纳秒
+    key <= 1'b1;
+    #188
+    key <= 1'b0;
+    #400
+
+    // 延迟4000纳秒观察
+    {k_2, k_1} <= 2'b10;
+    #3900
+    {k_2, k_1} <= 2'b01;
+    #3800
+
+    // 按下一次key, 持续288纳秒, 现在应该是关闭显示了, x为0
+    key <= 1'b1;
+    #288
+    key <= 1'b0;
+end
+
+
+reg [5:0] CNT;
+always @(posedge sys_clk or negedge sys_rst) begin
+    if (sys_rst == 1'b0) begin
+        CNT <= 5'd0;
+    end
+    else if (CNT < (5'd25 - 5'd1)) begin
+        CNT <= CNT + 5'd1;
+    end
+    else begin
+        CNT <= 5'b0;
+    end
+end
+
+
+reg [7:0]x;
+reg [7:0]y;
+always @(posedge sys_clk or negedge sys_rst) begin
+    if (sys_rst == 1'b0) begin
+        {k_2, k_1} <= 2'b11;
+        x <= 8'b00000000;
+        y <= 8'b11111111;  // 所有的都显示算了
+    end
+    else if ({k_2, k_1} == 2'b10 && is_show) begin
+        case (flag)
+            1'b0: x <= 8'b1010_1010;
+            1'b1: x <= 8'b0101_0101;
+        endcase
+    end
+    else if ({k_2, k_1} == 2'b01 && is_show) begin
+        case (flag)
+            1'b0: x <= 8'b1111_0000;
+            1'b1: x <= 8'b0000_1111;
+        endcase
+    end
+    else begin
+        x <= 8'b00000000;
+    end
+end
+
+always @(posedge sys_clk or negedge sys_rst) begin
+    if (sys_rst == 1'b0) begin
+        flag <= 1'b0;
+    end
+    else if (CNT == (5'd25 - 5'd1)) begin
+        flag <= !flag;
+    end
+    else begin
+    end
+end
+
+
+always @(posedge sys_clk or negedge sys_rst) begin
+    if (sys_rst == 1'b0) begin
+        key <= 1'b0;
+        key_1 <= 1'b0;
+        key_2 <= 1'b0;
+    end
+    else begin
+        key_1 <= key;
+        key_2 <= key_1;
+    end
+end
+
+// 用一个时钟周期即可判断是否在当前时钟周期上升沿之前, 按下了按键
+assign is_click = key_1 && !key_2;
+// 使用时钟约束一下
+always @(posedge sys_clk or negedge sys_rst) begin
+    if (sys_rst == 1'b0) begin
+        is_show <= 1'b0;
+    end
+    else if (is_click) begin
+        is_show <= !is_show;
+    end
+    else begin
+    end
+end
+
+
+
+lm u_lm(
+    .x (x),
+    .y (y)
+);
+
+
+endmodule
\ No newline at end of file