keypad demo

keypad.sv

@@ -0,0 +1,29 @@
+module keypad(
+    input clk_in,
+    input wire [3:0] row,
+    output logic [3:0] col,
+    output [5:0] cur_press
+);
+
+    logic [1:0] col_idx;
+    logic [15:0] keymap;
+
+    assign cur_press = {clk_in, 1'b0, keymap[3:0]};
+
+    initial begin 
+        col_idx = 0;
+        col = 0;
+        keymap = 0;
+    end
+
+    always_ff @(posedge clk_in) begin
+        for(logic [2:0] i = 0; i < 4; i++) begin
+            keymap[(i*4)+col_idx] <= row[i[1:0]];
+        end 
+
+        col[col_idx] <= 1;
+        col[col_idx+1] <= 0;
+        col_idx <= col_idx + 1;
+    end
+
+endmodule