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

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