move stuff around

1 files changed, 39 insertions, 0 deletions

diff --git a/playground/ser_to_par.v b/playground/ser_to_par.v
new file mode 100644
index 0000000..f0a0c47
--- /dev/null
+++ b/playground/ser_to_par.v
@@ -0,0 +1,39 @@
+`timescale 1us/1us
+
+// serial to parallel converter
+// Learning:
+// I don't like this.
+// I think I need a signal / way to say "I'm finished"?
+// or generally, an enable pin.
+//
+
+module ser_to_par #(
+  parameter SHIFT_WIDTH = 8
+) (
+  input rst_i,
+  input clk_i,
+
+  input dat_valid_i,
+  input dat_i,
+
+  output reg[(SHIFT_WIDTH - 1):0] dat_o,
+  // ???
+  output dat_valid_o
+);
+
+reg [$clog2(SHIFT_WIDTH) - 1 : 0] count = {$clog2(SHIFT_WIDTH){1'b0}};
+
+always @(posedge clk_i or negedge rst_i) begin
+  if (!rst_i) begin
+    dat_o <= 8'b0;
+  end else if(dat_valid_i) begin
+    // shift into highest bit first, so it is subsequently shifted down
+    dat_o[SHIFT_WIDTH - 1] <= dat_i;
+    dat_o[(SHIFT_WIDTH - 2):0] <= dat_o[(SHIFT_WIDTH - 1):1];
+    count <= count + 1;
+  end
+end
+
+assign dat_valid_o = count == 0;
+
+endmodule