move stuff around

1 files changed, 36 insertions, 0 deletions

diff --git a/playground/clkdiv.v b/playground/clkdiv.v
new file mode 100644
index 0000000..b6f1419
--- /dev/null
+++ b/playground/clkdiv.v
@@ -0,0 +1,36 @@
+`timescale 1us/1us
+
+module clkdiv (
+    input rst_i,
+    input clk,              // clk input
+    output reg o_divclk     // divided output (must be a reg, b/c it needs to keep state)
+);
+
+reg [23:0] counter;
+//  CLK is 27 MHz
+//  we want a 2Hz signal at the output
+//  and pin needs to *toggle twice* within one period
+//  27MHz / 4 = 6750000
+localparam DIVISOR = 24'd6_749_999;
+
+always @(posedge clk or negedge rst_i) begin
+    if (!rst_i)
+        counter <= 24'd0;
+    else if (counter < DIVISOR)
+        counter <= counter + 1'b1;
+    else
+        counter <= 24'd0;
+end
+
+always @(posedge clk or negedge rst_i) begin
+    if (!rst_i)
+        o_divclk <= 1'b0;
+    else if (counter == DIVISOR)
+        o_divclk <= ~o_divclk;
+    else
+        o_divclk <= o_divclk;
+end
+
+
+endmodule
+