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

// Copyright (C) 2001 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: dbg_uart_tasks.v

// 

// *Module Description:

//                      openMSP430 debug interface UART tasks

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev: 134 $

// $LastChangedBy: olivier.girard $

// $LastChangedDate: 2012-03-22 21:31:06 +0100 (Thu, 22 Mar 2012) $

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

// Register B/W and addresses

parameter           CPU_ID_LO    =  (8'h00 | 8'h00);

parameter           CPU_ID_HI    =  (8'h00 | 8'h01);

parameter           CPU_CTL      =  (8'h40 | 8'h02);

parameter           CPU_STAT     =  (8'h40 | 8'h03);

parameter           MEM_CTL      =  (8'h40 | 8'h04);

parameter           MEM_ADDR     =  (8'h00 | 8'h05);

parameter           MEM_DATA     =  (8'h00 | 8'h06);

parameter           MEM_CNT      =  (8'h00 | 8'h07);

parameter           BRK0_CTL     =  (8'h40 | 8'h08);

parameter           BRK0_STAT    =  (8'h40 | 8'h09);

parameter           BRK0_ADDR0   =  (8'h00 | 8'h0A);

parameter           BRK0_ADDR1   =  (8'h00 | 8'h0B);

parameter           BRK1_CTL     =  (8'h40 | 8'h0C);

parameter           BRK1_STAT    =  (8'h40 | 8'h0D);

parameter           BRK1_ADDR0   =  (8'h00 | 8'h0E);

parameter           BRK1_ADDR1   =  (8'h00 | 8'h0F);

parameter           BRK2_CTL     =  (8'h40 | 8'h10);

parameter           BRK2_STAT    =  (8'h40 | 8'h11);

parameter           BRK2_ADDR0   =  (8'h00 | 8'h12);

parameter           BRK2_ADDR1   =  (8'h00 | 8'h13);

parameter           BRK3_CTL     =  (8'h40 | 8'h14);

parameter           BRK3_STAT    =  (8'h40 | 8'h15);

parameter           BRK3_ADDR0   =  (8'h00 | 8'h16);

parameter           BRK3_ADDR1   =  (8'h00 | 8'h17);

// Read / Write commands

parameter           DBG_WR       =   8'h80;

parameter           DBG_RD       =   8'h00;

// Synchronization value

parameter           DBG_SYNC     =   8'h80;

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

// UART COMMUNICATION DATA RATE CONFIGURATION

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

// If the auto synchronization mode is set, then the communication speed

// is configured by the testbench.

// If not, the values from the openMSP430.inc file are taken over.

`ifdef DBG_UART_AUTO_SYNC

parameter UART_BAUD   = 4000000;

integer   UART_PERIOD = 1000000000/UART_BAUD;

`else

integer   UART_PERIOD = `DBG_UART_CNT;

`endif

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

// Receive UART frame from CPU Debug interface (8N1)

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

task dbg_uart_rx;

   output [7:0] dbg_rxbuf;

   reg [7:0]     dbg_rxbuf;

   reg [7:0]     rxbuf;

   integer      rxcnt;

   begin

      #(1);

      dbg_uart_rx_busy = 1'b1;

      @(negedge dbg_uart_txd);

      dbg_rxbuf = 0;

      rxbuf     = 0;

      #(3*UART_PERIOD/2);

      for (rxcnt = 0; rxcnt < 8; rxcnt = rxcnt + 1)

        begin

           rxbuf = {dbg_uart_txd, rxbuf[7:1]};

           #(UART_PERIOD);

        end

      dbg_rxbuf        = rxbuf;

      dbg_uart_rx_busy = 1'b0;

   end

endtask

task dbg_uart_rx16;

   reg [7:0] rxbuf_lo;

   reg [7:0] rxbuf_hi;

   begin

      rxbuf_lo = 8'h00;

      rxbuf_hi = 8'h00;

      dbg_uart_rx(rxbuf_lo);

      dbg_uart_rx(rxbuf_hi);

      dbg_uart_buf = {rxbuf_hi, rxbuf_lo};

   end

endtask

task dbg_uart_rx8;

   reg [7:0] rxbuf;

   begin

      rxbuf = 8'h00;

      dbg_uart_rx(rxbuf);

      dbg_uart_buf = {8'h00, rxbuf};

   end

endtask

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

// Transmit UART frame to CPU Debug interface (8N1)

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

task dbg_uart_tx;

   input  [7:0] txbuf;

   reg [9:0]     txbuf_full;

   integer      txcnt;

   begin

      #(1);

      dbg_uart_tx_busy = 1'b1;

      dbg_uart_rxd_pre = 1'b1;

      txbuf_full       = {1'b1, txbuf, 1'b0};

      for (txcnt = 0; txcnt < 10; txcnt = txcnt + 1)

        begin

           #(UART_PERIOD);

           dbg_uart_rxd_pre =  txbuf_full[txcnt];

        end

      dbg_uart_tx_busy = 1'b0;

   end

endtask

task dbg_uart_tx16;

   input  [15:0] txbuf;

   begin

      dbg_uart_tx(txbuf[7:0]);

      dbg_uart_tx(txbuf[15:8]);

   end

endtask

always @(posedge mclk or posedge dbg_rst)

  if (dbg_rst)

    begin

       dbg_uart_rxd_sel <= 1'b0;

       dbg_uart_rxd_dly <= 1'b1;

    end

  else if (dbg_en)

    begin

       dbg_uart_rxd_sel <= dbg_uart_rxd_meta ? $random : 1'b0;

       dbg_uart_rxd_dly <= dbg_uart_rxd_pre;

    end

assign dbg_uart_rxd = dbg_uart_rxd_sel ? dbg_uart_rxd_dly : dbg_uart_rxd_pre;

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

// Write to Debug register

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

task dbg_uart_wr;

   input  [7:0] dbg_reg;

   input [15:0] dbg_data;

   begin

      dbg_uart_tx(DBG_WR | dbg_reg);

      dbg_uart_tx(dbg_data[7:0]);

      if (~dbg_reg[6])

        dbg_uart_tx(dbg_data[15:8]);

   end

endtask

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

// Read Debug register

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

task dbg_uart_rd;

   input  [7:0] dbg_reg;

   reg [7:0]     rxbuf_lo;

   reg [7:0]     rxbuf_hi;

   begin

      rxbuf_lo = 8'h00;

      rxbuf_hi = 8'h00;

      dbg_uart_tx(DBG_RD | dbg_reg);

      dbg_uart_rx(rxbuf_lo);

      if (~dbg_reg[6])

        dbg_uart_rx(rxbuf_hi);

      dbg_uart_buf = {rxbuf_hi, rxbuf_lo};

      end

endtask

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

// Send synchronization frame

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

task dbg_uart_sync;

   begin

      dbg_uart_tx(DBG_SYNC);

      repeat(10) @(posedge mclk);

   end

endtask