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//----------------------------------------------------------------------------

// Copyright (C) 2011 Authors

//

// This source file may be used and distributed without restriction provided

// that this copyright statement is not removed from the file and that any

// derivative work contains the original copyright notice and the associated

// disclaimer.

//

// This source file is free software; you can redistribute it and/or modify

// it under the terms of the GNU Lesser General Public License as published

// by the Free Software Foundation; either version 2.1 of the License, or

// (at your option) any later version.

//

// This source 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 Lesser General Public

// License for more details.

//

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

// along with this source; if not, write to the Free Software Foundation,

// Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

//

//----------------------------------------------------------------------------

// 

// *File Name: omsp_system_1.v

// 

// *Module Description:

//                      openMSP430 System 0.

//                      This core is dedicated to communication and

//                      display (i.e. UART, LEDs and 7-segment modport)

//                      It can also read the switches value.

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

//----------------------------------------------------------------------------

`include "openmsp430/openMSP430_defines.v"

module omsp_system_0 (

// Clock & Reset

    dco_clk,                               // Fast oscillator (fast clock)

    reset_n,                               // Reset Pin (low active, asynchronous and non-glitchy)

// Serial Debug Interface (I2C)

    dbg_i2c_addr,                          // Debug interface: I2C Address

    dbg_i2c_broadcast,                     // Debug interface: I2C Broadcast Address (for multicore systems)

    dbg_i2c_scl,                           // Debug interface: I2C SCL

    dbg_i2c_sda_in,                        // Debug interface: I2C SDA IN

    dbg_i2c_sda_out,                       // Debug interface: I2C SDA OUT

// Data Memory

    dmem_addr,                             // Data Memory address

    dmem_cen,                              // Data Memory chip enable (low active)

    dmem_din,                              // Data Memory data input

    dmem_wen,                              // Data Memory write enable (low active)

    dmem_dout,                             // Data Memory data output

// Program Memory

    pmem_addr,                             // Program Memory address

    pmem_cen,                              // Program Memory chip enable (low active)

    pmem_din,                              // Program Memory data input (optional)

    pmem_wen,                              // Program Memory write enable (low active) (optional)

    pmem_dout,                             // Program Memory data output

// UART

    uart_rxd,                              // UART Data Receive (RXD)

    uart_txd,                              // UART Data Transmit (TXD)

// Switches & LEDs

    switch,                                // Input switches

    led                                    // LEDs

);

// Clock & Reset

input                dco_clk;              // Fast oscillator (fast clock)

input                reset_n;              // Reset Pin (low active, asynchronous and non-glitchy)

// Serial Debug Interface (I2C)

input          [6:0] dbg_i2c_addr;         // Debug interface: I2C Address

input          [6:0] dbg_i2c_broadcast;    // Debug interface: I2C Broadcast Address (for multicore systems)

input                dbg_i2c_scl;          // Debug interface: I2C SCL

input                dbg_i2c_sda_in;       // Debug interface: I2C SDA IN

output               dbg_i2c_sda_out;      // Debug interface: I2C SDA OUT

// Data Memory

input         [15:0] dmem_dout;            // Data Memory data output

output [`DMEM_MSB:0] dmem_addr;            // Data Memory address

output               dmem_cen;             // Data Memory chip enable (low active)

output        [15:0] dmem_din;             // Data Memory data input

output         [1:0] dmem_wen;             // Data Memory write enable (low active)

// Program Memory

input         [15:0] pmem_dout;            // Program Memory data output

output [`PMEM_MSB:0] pmem_addr;            // Program Memory address

output               pmem_cen;             // Program Memory chip enable (low active)

output        [15:0] pmem_din;             // Program Memory data input (optional)

output         [1:0] pmem_wen;             // Program Memory write enable (low active) (optional)

// UART

input                uart_rxd;             // UART Data Receive (RXD)

output               uart_txd;             // UART Data Transmit (TXD)

// Switches & LEDs

input          [3:0] switch;               // Input switches

output         [1:0] led;                  // LEDs

//=============================================================================

// 1)  INTERNAL WIRES/REGISTERS/PARAMETERS DECLARATION

//=============================================================================

// Clock & Reset

wire               mclk;

wire               aclk_en;

wire               smclk_en;

wire               puc_rst;

// Debug interface

wire               dbg_freeze;

// Data memory

wire [`DMEM_MSB:0] dmem_addr;

wire               dmem_cen;

wire        [15:0] dmem_din;

wire         [1:0] dmem_wen;

wire        [15:0] dmem_dout;

// Program memory

wire [`PMEM_MSB:0] pmem_addr;

wire               pmem_cen;

wire        [15:0] pmem_din;

wire         [1:0] pmem_wen;

wire        [15:0] pmem_dout;

// Peripheral bus

wire        [13:0] per_addr;

wire        [15:0] per_din;

wire         [1:0] per_we;

wire               per_en;

wire        [15:0] per_dout;

// Interrupts

wire        [13:0] irq_acc;

wire        [13:0] irq_bus;

wire               nmi;

// GPIO

wire         [7:0] p1_din;

wire         [7:0] p1_dout;

wire         [7:0] p1_dout_en;

wire         [7:0] p1_sel;

wire         [7:0] p2_din;

wire         [7:0] p2_dout;

wire         [7:0] p2_dout_en;

wire         [7:0] p2_sel;

wire        [15:0] per_dout_gpio;

// Timer A

wire        [15:0] per_dout_tA;

// Hardware UART

wire        [15:0] per_dout_uart;

//=============================================================================

// 2)  OPENMSP430 CORE

//=============================================================================

openMSP430 #(.INST_NR (0),

             .TOTAL_NR(1)) openMSP430_0 (

// OUTPUTs

    .aclk              (),                   // ASIC ONLY: ACLK

    .aclk_en           (aclk_en),            // FPGA ONLY: ACLK enable

    .dbg_freeze        (dbg_freeze),         // Freeze peripherals

    .dbg_i2c_sda_out   (dbg_i2c_sda_out),    // Debug interface: I2C SDA OUT

    .dbg_uart_txd      (),                   // Debug interface: UART TXD

    .dco_enable        (),                   // ASIC ONLY: Fast oscillator enable

    .dco_wkup          (),                   // ASIC ONLY: Fast oscillator wake-up (asynchronous)

    .dmem_addr         (dmem_addr),          // Data Memory address

    .dmem_cen          (dmem_cen),           // Data Memory chip enable (low active)

    .dmem_din          (dmem_din),           // Data Memory data input

    .dmem_wen          (dmem_wen),           // Data Memory write enable (low active)

    .irq_acc           (irq_acc),            // Interrupt request accepted (one-hot signal)

    .lfxt_enable       (),                   // ASIC ONLY: Low frequency oscillator enable

    .lfxt_wkup         (),                   // ASIC ONLY: Low frequency oscillator wake-up (asynchronous)

    .mclk              (mclk),               // Main system clock

    .per_addr          (per_addr),           // Peripheral address

    .per_din           (per_din),            // Peripheral data input

    .per_we            (per_we),             // Peripheral write enable (high active)

    .per_en            (per_en),             // Peripheral enable (high active)

    .pmem_addr         (pmem_addr),          // Program Memory address

    .pmem_cen          (pmem_cen),           // Program Memory chip enable (low active)

    .pmem_din          (pmem_din),           // Program Memory data input (optional)

    .pmem_wen          (pmem_wen),           // Program Memory write enable (low active) (optional)

    .puc_rst           (puc_rst),            // Main system reset

    .smclk             (),                   // ASIC ONLY: SMCLK

    .smclk_en          (smclk_en),           // FPGA ONLY: SMCLK enable

// INPUTs

    .cpu_en            (1'b1),               // Enable CPU code execution (asynchronous and non-glitchy)

    .dbg_en            (1'b1),               // Debug interface enable (asynchronous and non-glitchy)

    .dbg_i2c_addr      (dbg_i2c_addr),       // Debug interface: I2C Address

    .dbg_i2c_broadcast (dbg_i2c_broadcast),  // Debug interface: I2C Broadcast Address (for multicore systems)

    .dbg_i2c_scl       (dbg_i2c_scl),        // Debug interface: I2C SCL

    .dbg_i2c_sda_in    (dbg_i2c_sda_in),     // Debug interface: I2C SDA IN

    .dbg_uart_rxd      (1'b1),               // Debug interface: UART RXD (asynchronous)

    .dco_clk           (dco_clk),            // Fast oscillator (fast clock)

    .dmem_dout         (dmem_dout),          // Data Memory data output

    .irq               (irq_bus),            // Maskable interrupts

    .lfxt_clk          (1'b0),               // Low frequency oscillator (typ 32kHz)

    .nmi               (nmi),                // Non-maskable interrupt (asynchronous)

    .per_dout          (per_dout),           // Peripheral data output

    .pmem_dout         (pmem_dout),          // Program Memory data output

    .reset_n           (reset_n),            // Reset Pin (low active, asynchronous and non-glitchy)

    .scan_enable       (1'b0),               // ASIC ONLY: Scan enable (active during scan shifting)

    .scan_mode         (1'b0),               // ASIC ONLY: Scan mode

    .wkup              (1'b0)                // ASIC ONLY: System Wake-up (asynchronous and non-glitchy)

);

//=============================================================================

// 3)  OPENMSP430 PERIPHERALS

//=============================================================================

//

// Digital I/O

//-------------------------------

omsp_gpio #(.P1_EN(1),

            .P2_EN(1),

            .P3_EN(0),

            .P4_EN(0),

            .P5_EN(0),

            .P6_EN(0)) gpio_0 (

// OUTPUTs

    .irq_port1    (irq_port1),             // Port 1 interrupt

    .irq_port2    (irq_port2),             // Port 2 interrupt

    .p1_dout      (p1_dout),               // Port 1 data output

    .p1_dout_en   (p1_dout_en),            // Port 1 data output enable

    .p1_sel       (p1_sel),                // Port 1 function select

    .p2_dout      (p2_dout),               // Port 2 data output

    .p2_dout_en   (p2_dout_en),            // Port 2 data output enable

    .p2_sel       (p2_sel),                // Port 2 function select

    .p3_dout      (),                      // Port 3 data output

    .p3_dout_en   (),                      // Port 3 data output enable

    .p3_sel       (),                      // Port 3 function select

    .p4_dout      (),                      // Port 4 data output

    .p4_dout_en   (),                      // Port 4 data output enable

    .p4_sel       (),                      // Port 4 function select

    .p5_dout      (),                      // Port 5 data output

    .p5_dout_en   (),                      // Port 5 data output enable

    .p5_sel       (),                      // Port 5 function select

    .p6_dout      (),                      // Port 6 data output

    .p6_dout_en   (),                      // Port 6 data output enable

    .p6_sel       (),                      // Port 6 function select

    .per_dout     (per_dout_gpio),         // Peripheral data output

// INPUTs

    .mclk         (mclk),                  // Main system clock

    .p1_din       (p1_din),                // Port 1 data input

    .p2_din       (p2_din),                // Port 2 data input

    .p3_din       (8'h00),                 // Port 3 data input

    .p4_din       (8'h00),                 // Port 4 data input

    .p5_din       (8'h00),                 // Port 5 data input

    .p6_din       (8'h00),                 // Port 6 data input

    .per_addr     (per_addr),              // Peripheral address

    .per_din      (per_din),               // Peripheral data input

    .per_en       (per_en),                // Peripheral enable (high active)

    .per_we       (per_we),                // Peripheral write enable (high active)

    .puc_rst      (puc_rst)                // Main system reset

);

// Assign LEDs

assign  led         = p2_dout[1:0] & p2_dout_en[1:0];

// Assign Switches

assign  p1_din[7:4] = 4'h0;

assign  p1_din[3:0] = switch;

//

// Timer A

//----------------------------------------------

omsp_timerA timerA_0 (

// OUTPUTs

    .irq_ta0      (irq_ta0),               // Timer A interrupt: TACCR0

    .irq_ta1      (irq_ta1),               // Timer A interrupt: TAIV, TACCR1, TACCR2

    .per_dout     (per_dout_tA),           // Peripheral data output

    .ta_out0      (),                      // Timer A output 0

    .ta_out0_en   (),                      // Timer A output 0 enable

    .ta_out1      (),                      // Timer A output 1

    .ta_out1_en   (),                      // Timer A output 1 enable

    .ta_out2      (),                      // Timer A output 2

    .ta_out2_en   (),                      // Timer A output 2 enable

// INPUTs

    .aclk_en      (aclk_en),               // ACLK enable (from CPU)

    .dbg_freeze   (dbg_freeze),            // Freeze Timer A counter

    .inclk        (1'b0),                  // INCLK external timer clock (SLOW)

    .irq_ta0_acc  (irq_acc[9]),            // Interrupt request TACCR0 accepted

    .mclk         (mclk),                  // Main system clock

    .per_addr     (per_addr),              // Peripheral address

    .per_din      (per_din),               // Peripheral data input

    .per_en       (per_en),                // Peripheral enable (high active)

    .per_we       (per_we),                // Peripheral write enable (high active)

    .puc_rst      (puc_rst),               // Main system reset

    .smclk_en     (smclk_en),              // SMCLK enable (from CPU)

    .ta_cci0a     (1'b0),                  // Timer A capture 0 input A

    .ta_cci0b     (1'b0),                  // Timer A capture 0 input B

    .ta_cci1a     (1'b0),                  // Timer A capture 1 input A

    .ta_cci1b     (1'b0),                  // Timer A capture 1 input B

    .ta_cci2a     (1'b0),                  // Timer A capture 2 input A

    .ta_cci2b     (1'b0),                  // Timer A capture 2 input B

    .taclk        (1'b0)                   // TACLK external timer clock (SLOW)

);

//

// Hardware UART

//----------------------------------------------

omsp_uart uart_0 (

// OUTPUTs

    .irq_uart_rx  (irq_uart_rx),           // UART receive interrupt

    .irq_uart_tx  (irq_uart_tx),           // UART transmit interrupt

    .per_dout     (per_dout_uart),         // Peripheral data output

    .uart_txd     (uart_txd),              // UART Data Transmit (TXD)

// INPUTs

    .mclk         (mclk),                  // Main system clock

    .per_addr     (per_addr),              // Peripheral address

    .per_din      (per_din),               // Peripheral data input

    .per_en       (per_en),                // Peripheral enable (high active)

    .per_we       (per_we),                // Peripheral write enable (high active)

    .puc_rst      (puc_rst),               // Main system reset

    .smclk_en     (smclk_en),              // SMCLK enable (from CPU)

    .uart_rxd     (uart_rxd)               // UART Data Receive (RXD)

);

//

// Combine peripheral data buses

//-------------------------------

assign per_dout = per_dout_gpio  |

                  per_dout_uart  |

                  per_dout_tA;

//

// Assign interrupts

//-------------------------------

assign nmi      =   1'b0;

assign irq_bus  =  {1'b0,         // Vector 13  (0xFFFA)

                    1'b0,         // Vector 12  (0xFFF8)

                    1'b0,         // Vector 11  (0xFFF6)

                    1'b0,         // Vector 10  (0xFFF4) - Watchdog -

                    irq_ta0,      // Vector  9  (0xFFF2)

                    irq_ta1,      // Vector  8  (0xFFF0)

                    irq_uart_rx,  // Vector  7  (0xFFEE)

                    irq_uart_tx,  // Vector  6  (0xFFEC)

                    1'b0,         // Vector  5  (0xFFEA) - Reserved (Timer-A 0 from system 1)

                    1'b0,         // Vector  4  (0xFFE8) - Reserved (Timer-A 1 from system 1)

                    irq_port2,    // Vector  3  (0xFFE6)

                    irq_port1,    // Vector  2  (0xFFE4)

                    1'b0,         // Vector  1  (0xFFE2) - Reserved (Port 2 from system 1)

                    1'b0};        // Vector  0  (0xFFE0) - Reserved (Port 1 from system 1)

endmodule // omsp_system_0