Plz help me to link these modules in verilog

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nitheeshnas

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i am doing a project on designing an ic for controlling the speed of a dc motor . the main modules in my project are pwm ,encoder,counter and pid..
i have generated the codes for counter, pid and pwm seperately but when i try to link it ..i am not getting it right ...plz help me..

these are my there modules

1,counter

Code Verilog - [expand]
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module count(clk,a,out,r,n,e);
input clk;
input a;
input [7:0]r;
input [7:0]n;
integer counter=0; 
output reg [7:0]e;
output reg [7:0]out;
reg [7:0]temp;
always @ (a)
begin
    if (a==1) counter=counter+1;
    temp=(counter/r);
    out=(temp*n);
    if
    (out>=200) e=out-200;
    else
    e=200-out;
    end
    endmodule


2,pid

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module PIDdddd(u_out,e_in,clk,reset,u);
output signed [15:0] u_out;
output signed [15:0] u;
input signed [15:0] e_in;
input clk;
input reset;
parameter k1=107;
parameter k2 = 104;
parameter k3 = 2;
reg signed [15:0] u_prev;
reg signed [15:0] e_prev1;
reg signed [15:0] e_prev2;
assign err=(e_in/5);
assign u =(u_prev)+(k1*err)+(k3*e_prev2);
assign u_out = u+(-(k2*e_prev1));
always @ (posedge clk)
if (reset == 1) begin
u_prev <= 0;
e_prev1 <= 0;
e_prev2 <= 0;
end
else begin
e_prev2 <= e_prev1;
e_prev1 <= err;
u_prev <= u_out;
end
endmodule


3,pwm

Code Verilog - [expand]
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module pulse(clk,switches,pwm);
    input clk;
    input [16:0] switches;
    output pwm;
    reg pwm;
    reg [15:0] counter=0;
    parameter sd=195;
    always @ (posedge clk)
    begin
        counter=counter+5;
        if(counter<=switches*sd) pwm=1;
        else pwm=0;
       if (counter>=50000) counter=0;
     end
 endmodule



and i want to connect these 3 modules that is i want to input the output of counter to pid and output of pid to pwm...plz help me
 
Last edited by a moderator:

If it just how to connect between 3 modules, then..
you can create another module as a top module and connect all your modules(counter, pid etc...) inside this top module as what you said
i want to input the output of counter to pid and output of pid to pwm
Click to expand...
 

you can create a top module where you can instantiate all the other modules. like as follows ..

module TopModule(outputs & inputs here of the whole box containing the small boxes);
output ...
input .....

wire *instantiate some wires here to connect the modules among themselves*

//Now instantiate the modules in the following code. Read up on module instantiation. Just google it. Its pretty simple.

count counteri1(.............)
pid pidi1(...........)
pulse pulsei1(.............)
endmodule
 

Technically speaking you *should* TEST your individual modules first! And, by including them into a testbench file individually to make sure they work as expected in simulation, you will also learn how to connect them up in an upper level file to each other!
 

here i am adding the code for 3 modules counter,pid and pwm...plzz help me to link these three modules....in such a way that i want the output of counter to be given as the error signal input of pid(e_in) and the out put of pid (u_out) as the the input of pwm(switches)....plzz help....thanks in advance..

Code: 
module count(clk,a,out,r,n,e);
input clk;
input a;
input [7:0]r;
input [7:0]n;
integer counter=0; 
output reg [7:0]e;
output reg [7:0]out;
reg [7:0]temp;
always @ (a)
begin
    if (a==1) counter=counter+1;
    temp=(counter/r);
    out=(temp*n);
    if
    (out>=200) e=out-200;
    else
    e=200-out;
    end
    endmodule





Code: 
module PIDdddd(u_out,e_in,clk,reset,u);
output signed [15:0] u_out;
output signed [15:0] u;
input signed [15:0] e_in;
input clk;
input reset;
parameter k1=107;
parameter k2 = 104;
parameter k3 = 2;
reg signed [15:0] u_prev;
reg signed [15:0] e_prev1;
reg signed [15:0] e_prev2;
assign err=(e_in/5);
assign u =(u_prev)+(k1*err)+(k3*e_prev2);
assign u_out = u+(-(k2*e_prev1));
always @ (posedge clk)
if (reset == 1) begin
u_prev <= 0;
e_prev1 <= 0;
e_prev2 <= 0;
end
else begin
e_prev2 <= e_prev1;
e_prev1 <= err;
u_prev <= u_out;
end
endmodule



Code: 
module pulse(clk,switches,pwm);
    input clk;
    input [16:0] switches;
    output pwm;
    reg pwm;
    reg [15:0] counter=0;
    parameter sd=195;
    always @ (posedge clk)
    begin
        counter=counter+5;
        if(counter<=switches*sd) pwm=1;
        else pwm=0;
       if (counter>=50000) counter=0;
     end
 endmodule
 

As said before, excepting in/out definitions, the content inside each functional block don´t matter.

You must express it terms of diagram, what exactly do you want connect to what.


+++
 

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