phone control.v

利用电话远程系统

////////////////////////////////////////////////////////////
// phone control.v
// 
// created 2008.10.07
// Author : dreamstar at VLSI & Integrated System Lab Of BJUT.
///////////////////////////////////////////////////////////


`timescale 1ns/10ps

 module phone_control(clk,rst,enable,dtmf_high,dtmf_low,dtmf_data,playl,
           tele_on,isd_addr,led1,led2,clr,dtmf_clr,
           tstate,pass_counter,wrong_time,dtmf_con);
 
 output [2:0] tstate;   //STATE REGISTER;
 
 output [2:0] pass_counter;  //PASSWORD COUNTER;
 output [1:0] wrong_time;    //PASSWORD WRONG INPUT TIMES;
 output [3:0] dtmf_con;      //control number
 
 input clk;
 input enable;   //ring_c enable
 input rst;
 input dtmf_high;   //DTMF CODING COMPLETE INDICATION;
 input dtmf_low;
 input [3:0] dtmf_data;  //DTMF CODING DATA;
 
 output clr;      //ring_c clear;
 output dtmf_clr; //dtmf clear;
 output playl;    //ISE1420 PLAY CONTROL;
 output tele_on;  //telephone open;
 output [7:0] isd_addr;  //ISD ADDRESS;
 output led1;
 output led2;
 
 reg clr;
 reg dtmf_clr;
 reg playl;
 reg tele_on;
 reg [7:0] isd_addr;
 reg led1;
 reg led2;
 
 reg [2:0] tstate;   //STATE REGISTER;
 reg [2:0] ring_counter;  //RING COUNTER;
 reg [3:0] dtmf [3:0];    //DTMF PASSWORD MEMORY;
 reg [2:0] pass_counter;  //PASSWORD COUNTER;
 reg [1:0] wrong_time;    //PASSWORD WRONG INPUT TIMES;
 reg [3:0] dtmf_con;      //control number
 reg sel;
  
 parameter idle             =3'b000;
 parameter phone_on         =3'b001;
 parameter password_check   =3'b010;
 parameter password_wrong1  =3'b011;
 parameter password_wrong2  =3'b100;
 parameter phone_off        =3'b101; 
 parameter receive_control  =3'b110;
 
 parameter password1=4'b0001;
 parameter password2=4'b0010;
 parameter password3=4'b0011;
 parameter password4=4'b0100;
 
 
  
 always@(posedge clk or negedge rst)
   begin
    if(rst==0)
     begin
         tstate       <= idle;
         tele_on      <= 1'b0;
         playl        <= 1'b1;
         isd_addr     <= 8'b00000000;
         clr          <= 1'b1;
         dtmf[0]      <= 4'b0000;
         dtmf[1]      <= 4'b0000;
         dtmf[2]      <= 4'b0000;
         dtmf[3]      <= 4'b0000;
         pass_counter <= 3'b000;
         wrong_time   <= 2'b00;
         led1         <= 1'b1;
         led2         <= 1'b1;
         dtmf_clr     <= 1'b1;
       end
    else
     begin
     case(tstate)
     idle: begin
           if (enable==1'b1)
             begin
                 tele_on      <= 1'b1;
                 tstate       <= phone_on;
                 isd_addr     <= 8'b00000001;
                 playl        <= 1'b0;
                 clr          <= 1'b0;
             end
           else
                 tstate       <=idle;
          end
             
      phone_on:  
           begin
               if (dtmf_high==1'b1)
                 begin
                   dtmf[pass_counter] <= dtmf_data;
                   pass_counter       <= pass_counter+1;
                   playl              <= 1'b1;
                   dtmf_clr           <= 1'b0;
                 end
               else if (dtmf_low==1'b1)
                 dtmf_clr  <= 1'b1;
               else if (pass_counter==3'b100)
                    begin
                      tstate       <= password_check;
                      pass_counter <=3'b000;
                    end
               else 
                    tstate  <= phone_on;
          end
                        
      password_check:    
      begin
        if(dtmf[0]==password1 & dtmf[1]==password2 &
           dtmf[2]==password3 & dtmf[3]==password4)
          begin
              tstate      <= receive_control;
              wrong_time  <= 2'b00;
              isd_addr    <= 8'b00000100;
              playl       <= 1'b0;
              clr         <= 1'b1;
          end
        else if (wrong_time==2'b00)
          begin
              tstate      <= password_wrong1;
              wrong_time  <= wrong_time+1;
              isd_addr    <= 8'b00000010;
              playl       <= 1'b0;
          end
        else if (wrong_time==2'b01)
          begin
              tstate      <= password_wrong2;
              wrong_time  <= wrong_time+1;
              isd_addr    <= 8'b00000010;
              playl       <= 1'b0;
          end
        else
          begin
              tstate      <= phone_off;
              wrong_time  <= 2'b00;
              isd_addr    <= 8'b00000011;
              playl       <= 1'b0;
          end
      end
                       
      password_wrong1:   
      begin
           if (dtmf_high==1'b1)
              begin
                  dtmf[pass_counter] <= dtmf_data;
                  pass_counter       <= pass_counter+1;
                  playl              <= 1'b1;
                  dtmf_clr           <= 1'b0;
              end
           else if (dtmf_low==1'b1)
               dtmf_clr  <= 1'b1;
           else if (pass_counter==3'b100)
              begin
                  tstate          <= password_check;
                  pass_counter    <= 3'b000;
              end
           else
              tstate<=password_wrong1;
          end
         
      password_wrong2: 
         begin
             if (dtmf_high==1'b1)
               begin
                   dtmf[pass_counter]  <= dtmf_data;
                   pass_counter        <= pass_counter+1;
                   playl               <= 1'b1;
                   dtmf_clr            <= 1'b0;
               end
             else if (dtmf_low==1'b1)
                 dtmf_clr   <=  1'b1;
             else if (pass_counter==3'b100)
               begin
                   tstate          <= password_check;
                   pass_counter    <= 3'b000;
               end
             else
               tstate <= password_wrong2;
           end
               
      phone_off:  
      begin
           // if (dtmf_high==1'b1)
              // begin
              //     playl    <= 1'b1;
             //      tele_on  <= 1'b0;
            //   end
            // else
        tele_on <= 1'b0;
        tstate  <= idle;
     end
               
      receive_control:
         begin
            if (dtmf_high==1)
            begin
                dtmf_con  <= dtmf_data;
                dtmf_clr  <= 1'b0;
            end
            else if(dtmf_low==1'b1)
                dtmf_clr  <= 1'b1;
            else if (dtmf_con==4'b0001)
               begin
                   led1   <= 1'b0;
                   tstate <= idle;
               end
            else if (dtmf_con==4'b0010)
               begin
                   led2   <= 1'b0;
                   tstate <= idle;
               end
            else
                tstate <= receive_control;
         end
    
      default: tstate <= idle;
  endcase
  end
  end
  endmodule