SDR (Software Defined Radio) » OsmoSDR

---------------------------------------------------------------------------------------------------

-- Filename    : usbrx_gpio.vhd

-- Project     : OsmoSDR FPGA Firmware

-- Purpose     : GPIO Block

---------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------

-- Copyright (C) 2012 maintech GmbH, Otto-Hahn-Str. 15, 97204 Hoechberg, Germany --

-- written by Matthias Kleffel                                                   --

--                                                                               --

-- This program is free software; you can redistribute it and/or modify          --

-- it under the terms of the GNU General Public License as published by          --

-- the Free Software Foundation as version 3 of the License, or                  --

--                                                                               --

-- This program is distributed in the hope that it will be useful,               --

-- but WITHOUT ANY WARRANTY; without even the implied warranty of                --

-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  --

-- GNU General Public License V3 for more details.                               --

--                                                                               --

-- You should have received a copy of the GNU General Public License             --

-- along with this program. If not, see <http://www.gnu.org/licenses/>.          --

-----------------------------------------------------------------------------------

library ieee;

	use ieee.std_logic_1164.all;

	use ieee.numeric_std.all;

library work;

	use work.all;

	use work.mt_toolbox.all;

	use work.usbrx.all;

entity usbrx_gpio is

	port(

		-- common

		clk    : in  std_logic;

		reset  : in  std_logic;

		-- GPIOs

		gpio   : inout std_logic_vector(10 downto 0);

		-- config / status

		config : in  usbrx_gpio_config_t;

		status : out usbrx_gpio_status_t

	);

end usbrx_gpio;

architecture rtl of usbrx_gpio is

	-- register

	signal ireg : std_logic_vector(10 downto 0) := (others=>'0');

	signal oreg : std_logic_vector(10 downto 0) := (others=>'0');

	signal oena : std_logic_vector(10 downto 0) := (others=>'0');

begin

	-- create output-driver

	od: for i in gpio'range generate

	begin

		gpio(i) <= oreg(i) when oena(i)='1' else 'Z';

	end generate;

	-- IOBs

	process(clk)

	begin

		if rising_edge(clk) then

			ireg <= to_X01(gpio);

			oreg <= config.odata;

			oena <= config.oena;

		end if;

	end process;

end rtl;