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

// user_logic.v - module

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

//

//  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, either version 3 of the License, or

//  (at your option) any later version.

//

//  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 for more details.

//

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

//  along with this program.  If not, see .

//

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

wire pixel_on;

wire h_synch;

wire v_synch;

wire blank;

// instantiate the character generator

`VARIANT`CHAR_DISPLAY

#(.H_ACTIVE(H_ACTIVE))

 CHAR_DISPLAY

  (

  .clk               ( clk               ),

  .reset             ( reset             ),

  .subchar_line      ( subchar_line      ),

  .subchar_pixel     ( subchar_pixel     ),

  .pixel_on          ( pixel_on          ),

  .char_read_addr    ( char_read_addr    ),

  .char_write_addr   ( address           ),

  .char_write_data   ( wdata             ),

  .char_gen_rom_data ( char_gen_rom_data ),

  .char_write_enable ( ascii_load        ),

  .ascii_code        ( ascii_code        )

);

// instantiate the video timing generator

`VARIANT`SVGA_TIMING_GENERATION

 #(.CHARACTER_DECODE_DELAY(CHARACTER_DECODE_DELAY),

   .H_ACTIVE(H_ACTIVE),

   .H_FRONT_PORCH(H_FRONT_PORCH),

   .H_SYNCH(H_SYNCH),

   .H_BACK_PORCH(H_BACK_PORCH),

   .H_TOTAL(H_TOTAL),

   .V_ACTIVE(V_ACTIVE),

   .V_FRONT_PORCH(V_FRONT_PORCH),

   .V_SYNCH(V_SYNCH),

   .V_BACK_PORCH(V_BACK_PORCH),

   .V_TOTAL(V_TOTAL)

  )

 SVGA_TIMING_GENERATION

(

  .clk            ( clk          ),

  .reset          ( reset        ),

  .h_synch        ( h_synch      ),

  .v_synch        ( v_synch      ),

  .blank          ( blank        ),

  .pixel_count    ( pixel_count  ),

  .line_count     ( line_count   ),

  .subchar_pixel  ( subchar_pixel),

  .subchar_line   ( subchar_line ),

  .char_column    ( char_column  ),

  .char_line      ( char_line    )

);

// instantiate the video output mux

`VARIANT`VIDEO_OUT

 VIDEO_OUT

(

  .clk                ( clk             ),

  .reset              ( reset           ),

  .h_synch            ( h_synch         ),

  .v_synch            ( v_synch         ),

  .blank              ( blank           ),

  .char_color         ( char_color      ),

  .back_color         ( back_color      ),

  .cursor_color       ( cursor_color    ),

  .pixel_on           ( pixel_on        ),

  .cursor_on          ( cursor_on       ),

  .hsync_n_out        ( hsync_n_pad_out ),

  .vsync_n_out        ( vsync_n_pad_out ),

  .red_out            ( red_pad_out     ),

  .green_out          ( green_pad_out   ),

  .blue_out           ( blue_pad_out    )

);

always @ (posedge clk )

   if (reset)    cursor_on <=  1'b0;

   else          cursor_on <= (char_read_addr ==  address) ;

always@(posedge clk)

  if(reset)       address <= 14'b00000000000000;

  else

  if(add_l_load)  address[7:0] <= wdata;

  else

  if(add_h_load)  address[13:8] <= wdata[5:0];

  else

  if(ascii_load)  address  <= address+ 14'b0000000000001;

  else            address  <= address;

always @ (*)

     begin

     char_read_addr    = (char_line[6:0] * H_ACTIVE / 8 ) + {7'b0000000,char_column[6:0]};

     end

assign   chargen_rom_address = {ascii_code[7:0], subchar_line[2:0]};