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-- Autor
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-- Author : Julian Andres Guarin Reyes.
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-- Project : JART, Just Another Ray Tracer.
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-- email : jguarin2002 at gmail.com, j.guarin at javeriana.edu.co
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-- This code was entirely written by Julian Andres Guarin Reyes.
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-- The following code is licensed under GNU Public License
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-- http://www.gnu.org/licenses/gpl-3.0.txt.
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-- This file is part of JART (Just Another Ray Tracer).
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-- JART (Just Another Ray Tracer) is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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-- JART (Just Another Ray Tracer) is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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-- You should have received a copy of the GNU General Public License
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-- along with JART (Just Another Ray Tracer). If not, see <http://www.gnu.org/licenses/>.
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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_unsigned.all;
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use ieee.numeric_std.all;
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use ieee.numeric_std.all;
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architecture rtl of uart is
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architecture rtl of uart is
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-- Ticks
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-- Ticks
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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--constant T50MHZ_54NS : integer := 27; -- 27 T50MHZ_540NS, 1 16 avo de bit
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constant TBIT : integer := 434/4; -- 15 1 bit Divide By four in order to obtain 460800 bps at 50 MHZ, by 2 for 230400, by 1 for 115200 bps
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constant TBIT : integer := 434/4; -- 15 1 bit
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constant THALF_BIT : integer := 217/4; -- 7 1/2 bit Divide By four in order to obtain 460800 bps at 50 MHZ, by 2 for 230400, by 1 for 115200 bps
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constant THALF_BIT : integer := 217/4; -- 7 1/2 bit
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-- Maquinas de Estado
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-- Maquinas de Estado
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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type tTxStateMachine is (WAITING_LOAD_TX,SET_STARTBIT_TX,SET_NBIT_TX,FINISH_TX);
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type tTxStateMachine is (WAITING_LOAD_TX,SET_STARTBIT_TX,SET_NBIT_TX,FINISH_TX);
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type tRxStateMachine is (WAIT_START_BIT,HOLD_STARTBIT_RX,WAIT_FOR_NEW_BIT_RX,SAMPLE_BIT_RX,SAMPLE_STOPBIT_RX);--,RX_OVF,DEBUGGING_RX);
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type tRxStateMachine is (WAIT_START_BIT,HOLD_STARTBIT_RX,WAIT_FOR_NEW_BIT_RX,SAMPLE_BIT_RX,SAMPLE_STOPBIT_RX);--,RX_OVF,DEBUGGING_RX);
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