contrib/firmware: add new i2c bit-banging feature to angie's firmware

add new i2c bit-banging feature, we can now connect in JTAG with the SoC
target and in i2c with the main board components at the same time.

Change-Id: I8e4516fe1ad5238e0373444f1c3c9bc0814d0f52
Signed-off-by: Ahmed BOUDJELIDA <aboudjelida@nanoxplore.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7796
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

contrib/firmware/angie/hdl/src/angie_bitstream.vhd

@@ -0,0 +1,96 @@
+-- SPDX-License-Identifier: BSD-3-Clause
+----------------------------------------------------------------------------
+-- Project Context: nanoXplore USB-JTAG Adapter Board, Spartan6
+-- Design Name:     NJTAG USB-JTAG Adapter FPGA source code
+-- Module Name:     _angie_openocd.vhd
+-- Target Device:   XC6SLX9-2 TQ144
+-- Tool versions:   ISE Webpack 13.2 -> 14.2
+-- Author:          Ahmed BOUDJELIDA    nanoXplore SAS
+----------------------------------------------------------------------------
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.std_logic_arith.all;
+use ieee.std_logic_unsigned.all;
+library UNISIM;
+use UNISIM.VComponents.all;
+
+entity S609 is port(
+  TRST : in std_logic;
+  TMS : in std_logic;
+  TCK : in std_logic;
+  TDI : in std_logic;
+  TDO : out std_logic;
+  SRST : in std_logic;
+
+  SDA : inout std_logic;
+  SDA_DIR : in std_logic;
+  SCL : in std_logic;
+
+  FTP : out std_logic_vector(7 downto 0):=(others => '1'); -- Test points
+  SI_TDO : in  std_logic;
+  ST_0 : out std_logic;
+  ST_1 : out std_logic;
+  ST_2 : out std_logic;
+
+  ST_4 : out std_logic;
+  ST_5 : out std_logic;
+
+  SO_SDA_OUT : out std_logic;
+  SO_SDA_IN : in std_logic;
+  SO_SCL : out std_logic;
+
+  SO_TRST : out std_logic;
+  SO_TMS : out std_logic;
+  SO_TCK : out std_logic;
+  SO_TDI : out std_logic;
+  SO_SRST : out std_logic
+);
+end S609;
+
+architecture A_S609 of S609 is
+begin
+
+--Directions:
+ST_0 <= '0';
+ST_1 <= '1';
+
+ST_4 <= '0';
+
+--TDO:
+TDO <= not SI_TDO;
+
+--TRST - TCK - TMS - TDI:
+SO_TRST <= TRST;
+SO_TMS <= TMS;
+SO_TCK <= TCK;
+SO_TDI <= TDI;
+ST_2 <= SRST;
+SO_SRST <= '0';
+
+SO_SCL <= SCL;
+
+SDA <= not(SO_SDA_IN) when (SDA_DIR = '1') else 'Z';
+SO_SDA_OUT <= SDA;
+
+process(SDA_DIR)
+begin
+	if(SDA_DIR = '1') then
+		ST_5 <= '1';
+	else
+		ST_5 <= '0';
+	end if;
+end process;
+
+
+--Points de test:
+FTP(0) <= SDA;
+FTP(1) <= SCL;
+FTP(2) <= not(SO_SDA_IN);
+FTP(3) <= SDA_DIR;
+FTP(5) <= SRST;
+FTP(4) <= SI_TDO;
+FTP(6) <= '1';
+FTP(7) <= '1';
+
+end A_S609;