trying to complete the following step for the below code if anyone can help that would be great:

 

Problem 3) testbench that instantiates ASCII27Seg to display all the numbers 0-9 converted from ASCII, on the wave display. Show the ascii codes using a radix of ascii. As stated, the 7-segment HexSeg codes they generate will be sort of hard to interpret directly in the waveforms and you can display them with a radix of binary which just shows which segments are on.

 

Code the testbench is for:

//
// ascii to 7 segment display conversion
//
module ASCII27Seg (input [7:0] AsciiCode, output reg [6:0] HexSeg);
always @ (*) begin
HexSeg = 8'd0;
$display ("AsciiCode %b", AsciiCode);
case (AsciiCode)
// A
8'h41 : HexSeg[3] = 1;
// a
8'h61 : HexSeg[3] = 1;
// B
8'h42 : begin
HexSeg[0] = 1; HexSeg[1] = 1;
end
// b
8'h62 : begin
HexSeg[0] = 1; HexSeg[1] = 1;
end
// C
8'h43 : begin
HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[6] = 1;
end
// c
8'h63 : begin
HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[6] = 1;
end
// D
8'h44 : begin
HexSeg[0] = 1; HexSeg[5] = 1;
end
// d
8'h64 : begin
HexSeg[0] = 1; HexSeg[5] = 1;
end
// E
8'h45 : begin
HexSeg[1] = 1; HexSeg[2] = 1;
end
// e
8'h65 : begin
HexSeg[1] = 1; HexSeg[2] = 1;
end
// F
8'h46 : begin
HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[3] = 1;
end
// f
8'h66 : begin
HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[3] = 1;
end
// G
8'h47 : begin
HexSeg[4] = 1;
end
// g
8'h67 : begin
HexSeg[4] = 1;
end
// H
8'h48 : begin
HexSeg[0] = 1; HexSeg[3] = 1;
end
// h
8'h68 : begin
HexSeg[0] = 1; HexSeg[3] = 1;
end
// I
8'h49 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[3] = 1; HexSeg[6] = 1;
end
// i
8'h69 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[3] = 1; HexSeg[6] = 1;
end
// J
8'h4A : begin
HexSeg[0] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// j
8'h6A : begin
HexSeg[0] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// K
8'h4B : begin
HexSeg[0] = 1; HexSeg[3] = 1;
end
// k
8'h6B : begin
HexSeg[0] = 1; HexSeg[3] = 1;
end
// L
8'h4C : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[6] = 1;
end
// l
8'h6C : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[6] = 1;
end
// M
8'h4D : begin
HexSeg[1] = 1; HexSeg[3] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// m
8'h6D : begin
HexSeg[1] = 1; HexSeg[3] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// N
8'h4E : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[3] = 1; HexSeg[5] = 1;
end
// n
8'h6E : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[3] = 1; HexSeg[5] = 1;
end
// O
8'h4F : begin
HexSeg[6] = 1;
end
// o
8'h6F : begin
HexSeg[6] = 1;
end
// P
8'h50 : begin
HexSeg[2] = 1; HexSeg[3] = 1;
end
// p
8'h70 : begin
HexSeg[2] = 1; HexSeg[3] = 1;
end
// Q
8'h51 : begin
HexSeg[3] = 1; HexSeg[4] = 1;
end
// q
8'h71 : begin
HexSeg[3] = 1; HexSeg[4] = 1;
end
// R
8'h52 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[3] = 1; HexSeg[5] = 1;
end
// r
8'h72 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1; HexSeg[3] = 1; HexSeg[5] = 1;
end
// S
8'h53 : begin
HexSeg[1] = 1; HexSeg[4] = 1;
end
// s
8'h73 : begin
HexSeg[1] = 1; HexSeg[4] = 1;
end
// T
8'h54 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1;
end
// t
8'h74 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[2] = 1;
end
// U
8'h55 : begin
HexSeg[0] = 1; HexSeg[6] = 1;
end
// u
8'h75 : begin
HexSeg[0] = 1; HexSeg[6] = 1;
end
// V
8'h56 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// v
8'h76 : begin
HexSeg[0] = 1; HexSeg[1] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// W
8'h57 : begin
HexSeg[0] = 1; HexSeg[2] = 1; HexSeg[4] = 1; HexSeg[6] = 1;
end
// w
8'h77 : begin
HexSeg[0] = 1; HexSeg[2] = 1; HexSeg[4] = 1; HexSeg[6] = 1;
end
// X
8'h58 : begin
HexSeg[0] = 1; HexSeg[3] = 1;
end
// x
8'h78 : begin
HexSeg[0] = 1; HexSeg[3] = 1;
end
// Y
8'h59 : begin
HexSeg[0] = 1; HexSeg[4] = 1;
end
// y
8'h79 : begin
HexSeg[0] = 1; HexSeg[4] = 1;
end
// Z
8'h5A : begin
HexSeg[2] = 1; HexSeg[5] = 1;
end
// z
8'h7A : begin
HexSeg[2] = 1; HexSeg[5] = 1;
end
// 0
8'h30 : begin
HexSeg[6] = 1;
end
// 1
8'h31 : begin
HexSeg[0] = 1; HexSeg[3] = 1; HexSeg[4] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// 2
8'h32 : begin
HexSeg[2] = 1; HexSeg[5] = 1;
end
// 3
8'h33 : begin
HexSeg[4] = 1; HexSeg[5] = 1;
end
// 4
8'h34 : begin
HexSeg[0] = 1; HexSeg[3] = 1; HexSeg[4] = 1;
end
// 5
8'h35 : begin
HexSeg[1] = 1; HexSeg[4] = 1;
end
// 6
8'h36 : begin
HexSeg[1] = 1;
end
// 7
8'h37 : begin
HexSeg[3] = 1; HexSeg[4] = 1; HexSeg[5] = 1; HexSeg[6] = 1;
end
// 8
8'h38 : begin
end
// 9
8'h39 : begin
HexSeg[4] = 1;
end
default : HexSeg = 8'b11111111;
endcase
end
endmodule
module ASCIICodes (input Kkey0, output [6:0] HexSeg4, HexSeg3, HexSeg2, HexSeg1, HexSeg0);
reg [7:0] Message [4:0];
always @ (*) begin
Message[4] = "H"; // this initialises Message in each pass
Message[3] = "e";
Message[2] = "l";
Message[1] = "l";
Message[0] = "o";
// Using case assumes a parallel structure
case (Kkey0)
1'b1 : begin
Message[4] = "H";
Message[3] = "e";
Message[2] = "l";
Message[1] = "l";
Message[0] = "o";
end
1'b0 : begin
Message[4] = "D";
Message[3] = "A";
Message[2] = "W";
Message[1] = "";
Message[0] = "";
end
default : begin
Message[4] = "D";
Message[3] = "A";
Message[2] = "W";
Message[1] = "";
Message[0] = "";
end
endcase
end
ASCII27Seg SevH4 (Message[4], HexSeg4);
ASCII27Seg SevH3 (Message[3], HexSeg3);
ASCII27Seg SevH2 (Message[2], HexSeg2);
ASCII27Seg SevH1 (Message[1], HexSeg1);
ASCII27Seg SevH0 (Message[0], HexSeg0);
endmodule