emitter_uart.v

module corescore_emitter_uart
  #(
    parameter clk_freq_hz = 0,
    parameter baud_rate = 57600)
  (
   input wire 	    i_clk,
   input wire 	    i_rst,
   input wire [7:0] i_data,
   input wire 	    i_valid,
   output reg 	    o_ready,
   output wire 	    o_uart_tx);

   localparam START_VALUE = clk_freq_hz/baud_rate;
   
   localparam WIDTH = $clog2(START_VALUE);
   
   reg [WIDTH:0]  cnt;
   
   reg [9:0] 	    data;

   assign o_uart_tx = data[0] | !(|data);

   always @(posedge i_clk) begin
      if (cnt[WIDTH] & !(|data))
	o_ready <= 1'b1;
      else if (i_valid & o_ready)
	o_ready <= 1'b0;

      if (o_ready | cnt[WIDTH])
	cnt <= {1'b0,START_VALUE[WIDTH-1:0]};
      else
	cnt <= cnt-1;
      
      if (cnt[WIDTH])
	data <= {1'b0, data[9:1]};
      else if (i_valid & o_ready)
	data <= {1'b1, i_data, 1'b0};
   end
      
endmodule

Good question. It looks like it ended up in CoreScore eventually, in which case Apache 2.0 would be the preferred license. Is that ok for you?

Hi Olof,

I've modified the not a bit:

# This module is designed after corescore_emitter_uart by Olof Kindgren which
# is part of the corescore repository on github.
#
# https://github.com/olofk/corescore/blob/master/rtl/corescore_emitter_uart.v
#
# The original code is licensed under the Apache-2.0 license.
# A copy of this license file is included in this repository in the LICENSES
# directory.

Do you think that is OK?

Yes. That's great. Thanks