-module WRITER (input clk, input clk_enable, output reg [7:0] tx_byte, output reg tx_signal = 0, input tx_busy, output reg finished = 0, output [12:0] ram_addr, input [15:0] ram_do, input [12:0] P);
+module WRITER (input clk, input clk_enable, output reg [7:0] tx_byte, output reg tx_signal = 0, input tx_busy, output reg finished = 0, output [12:0] ram_addr, input [15:0] ram_do, input [12:0] freeptr);