interface_RTX_Base.vhd

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-------------------------------------------------------------------------------
--! @file       interface_RTX_Base.vhd
--! @author     Michael Riedel
--! @author     Marc Kossmann
--! @version    v1.0.0
--! @date       11.11.2014
--! @brief      Interface Base-File (RTX) to embed Qsys-outputAssignments->))
--!
--! @par        History:
--! @details    v0.1.0 28.10.2014 Kossmann
--!             - initial setup
--! @details    v1.0.0 03.11.2014 Riedel
--!             - corrected documentation and indention
--! @details    v1.0.1 05.11.2014 Riedel
--!             - renamed led-outputs in StepperMotorControl-Component
--!             - removed unused-comments and corrected formatting
-------------------------------------------------------------------------------

--! Use Standard Library
LIBRARY ieee;
--! Use Logic Elements
USE ieee.std_logic_1164.all; 

--! Use Work Library
LIBRARY work;


--! @brief Base-Entity. This Entity describes the connection
--!        to DE2-Board
ENTITY interface_RTX_Base IS 
  PORT
  (
    CLOCK_50_B5B    : IN    STD_LOGIC;                                          --! 50 MHz Oscillator
    CPU_RESET_n     : IN    STD_LOGIC;                                          --! CPU reset_n
    SRAM_A          : OUT   STD_LOGIC_VECTOR(17 DOWNTO 0);                      --! SRAM address lines
    SRAM_D          : INOUT STD_LOGIC_VECTOR(15 DOWNTO 0);                      --! SRAM-data bus
    SRAM_CE_N       : OUT   STD_LOGIC;                                          --! SRAM chip enable
    SRAM_LB_N       : OUT   STD_LOGIC;                                          --! SRAM lower byte line
    SRAM_OE_N       : OUT   STD_LOGIC;                                          --! SRAM output enable (read) line
    SRAM_UB_N       : OUT   STD_LOGIC;                                          --! SRAM upper byte linkage
    SRAM_WE_N       : OUT   STD_LOGIC;                                          --! SRAM write enable line
    KEY             : IN    STD_LOGIC_VECTOR(3 DOWNTO 0);                       --! key-definition
    SW              : IN    STD_LOGIC_VECTOR(9 DOWNTO 0);                       --! slidINg switches
    LED9            : OUT   STD_LOGIC;                                          --! debug LEDs
    LEDG            : OUT   STD_LOGIC_VECTOR(7 DOWNTO 0);                       --! green leds
    LEDR            : OUT   STD_LOGIC_VECTOR(7 DOWNTO 0);                       --! red leds
    HEX0            : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);                       --! HEX display 0
    HEX1            : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);                       --! HEX display 1
    HEX2            : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);                       --! HEX display 2
    HEX3            : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);                       --! HEX display 3
    LCD_RS          : OUT   STD_LOGIC;                                          --! LCD RS
    LCD_RW          : OUT   STD_LOGIC;                                          --! LCD RW
    LCD_DQ          : INOUT STD_LOGIC_VECTOR(7 DOWNTO 0)  := (OTHERS => '0');   --! LCD data
    LCD_EN          : OUT   STD_LOGIC;                                          --! LCD enable
    HSMC_RX_P       : OUT   STD_LOGIC_VECTOR(16 DOWNTO 0);                      --! Motor_pwm1( bit 0 ) and Motor_pwm2( bit 1 )
    HSMC_RX_N       : OUT   STD_LOGIC_VECTOR(16 DOWNTO 0);                      --! Motor_pwm3( bit 0 ) and Motor_pwm4( bit 1 )
    HSMC_TX_N       : OUT   STD_LOGIC_VECTOR(16 DOWNTO 0);                      --! Motor_en_a( bit 2 )
    HSMC_TX_P       : OUT   STD_LOGIC_VECTOR(16 DOWNTO 0)                       --! Motor_en_b( bit 3 )
  );
END interface_RTX_Base;

--! @brief NIOS-Processor with SOPC-Peripherals
ARCHITECTURE a1 OF interface_RTX_Base IS 

COMPONENT StepperMotorControl IS
  PORT
  (
    reset_reset_n                    : IN    STD_LOGIC                     := '0';
    clk_clk                          : IN    STD_LOGIC                     := '0';
    sram_SRAM_OE_N                   : OUT   STD_LOGIC_VECTOR(0 DOWNTO 0);
    sram_SRAM_CE_N                   : OUT   STD_LOGIC_VECTOR(0 DOWNTO 0);
    sram_SRAM_BE_N                   : OUT   STD_LOGIC_VECTOR(1 DOWNTO 0);
    sram_SRAM_D                      : INOUT STD_LOGIC_VECTOR(15 DOWNTO 0) := (OTHERS => '0');
    sram_SRAM_A                      : OUT   STD_LOGIC_VECTOR(18 DOWNTO 0);
    sram_SRAM_WE_N                   : OUT   STD_LOGIC_VECTOR(0 DOWNTO 0);
    sw_export                        : IN    STD_LOGIC_VECTOR(9 DOWNTO 0)  := (OTHERS => '0');
    lcd_RS                           : OUT   STD_LOGIC;
    lcd_RW                           : OUT   STD_LOGIC;
    lcd_data                         : INOUT STD_LOGIC_VECTOR(7 DOWNTO 0)  := (OTHERS => '0');
    lcd_E                            : OUT   STD_LOGIC;
    key_export                       : IN    STD_LOGIC_VECTOR(3 DOWNTO 0)  := (OTHERS => '0');
    hex0_export                      : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);
    hex1_export                      : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);
    hex2_export                      : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);
    hex3_export                      : OUT   STD_LOGIC_VECTOR(6 DOWNTO 0);
    led9_export                      : OUT   STD_LOGIC;
    registers_conduit_nios_redleds   : OUT   STD_LOGIC_VECTOR(7 DOWNTO 0);
    registers_conduit_nios_greenleds : OUT   STD_LOGIC_VECTOR(7 DOWNTO 0);
    mcu_conduit_motor_motor_pwm      : OUT   STD_LOGIC_VECTOR(3 DOWNTO 0);
    mcu_conduit_motor_motor_en       : OUT   STD_LOGIC_VECTOR(1 DOWNTO 0)
  );
END COMPONENT StepperMotorControl;

SIGNAL be_n           : STD_LOGIC_VECTOR(1 DOWNTO 0);  --! Byte enable signals
SIGNAL motor_pwm_wire : STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL motor_en_wire  : STD_LOGIC_VECTOR(1 DOWNTO 0);

BEGIN 
  -- RAM
  SRAM_LB_N         <= be_n(0);
  SRAM_UB_N         <= be_n(1);
  
  -- Motor PWM
  HSMC_RX_P(0)      <= motor_pwm_wire(0);
  HSMC_RX_P(1)      <= motor_pwm_wire(1);
  HSMC_RX_N(0)      <= motor_pwm_wire(2);
  HSMC_RX_N(1)      <= motor_pwm_wire(3);
  -- visualized
  LEDG(3)           <= motor_pwm_wire(3);
  LEDG(2)           <= motor_pwm_wire(1);
  LEDG(1)           <= motor_pwm_wire(2);
  LEDG(0)           <= motor_pwm_wire(0);

  -- Motor EN
  HSMC_TX_N(2)      <= motor_en_wire(0);
  HSMC_TX_P(3)      <= motor_en_wire(1);
  -- visualized
  LEDG(5 DOWNTO 4)  <= motor_en_wire;
      
  u0 : COMPONENT StepperMotorControl
  PORT MAP
  (
    reset_reset_n                      => CPU_RESET_n,
    clk_clk                            => CLOCK_50_B5B,
    sram_SRAM_OE_N(0)                  => SRAM_OE_N,
    sram_SRAM_CE_N(0)                  => SRAM_CE_N,
    sram_SRAM_BE_N                     => be_n,
    sram_SRAM_D                        => SRAM_D,
    sram_SRAM_A(18 DOWNTO 1)           => SRAM_A ,
    sram_SRAM_WE_N(0)                  => SRAM_WE_N,
    sw_export                          => SW,
    lcd_RS                             => LCD_RS,
    lcd_RW                             => LCD_RW,
    lcd_data                           => LCD_DQ,
    lcd_E                              => LCD_EN,
    key_export                         => KEY,
    hex0_export                        => HEX0,
    hex1_export                        => HEX1,
    hex2_export                        => HEX2,
    hex3_export                        => HEX3,
    led9_export                        => LED9,
    registers_conduit_nios_redleds     => LEDR,
    --registers_conduit_nios_greenleds  => LEDG
    mcu_conduit_motor_motor_pwm        => motor_pwm_wire,
    mcu_conduit_motor_motor_en         => motor_en_wire
  );
END a1;