[SOLVED] problem about scanning 3x4 keypad in verilog

[pkl520]

hello i'm new here and a beginner in verilog

i have problem about scanning 3x4 keypad in verilog



above is question

now i already have 4-2 priority encoder to put row&column into keypad scanning and then

put data into binary to bcd converter

but now i'm stuck here. because i dont know how to put data into binary to bcd converter

can some give a help or hint?

i will be apreciate.

p.s: the attachment is my verilog code

module prio_encoder4_2 ( d0,d1,d2,d3 ,x ,y );
input d0 ;
input d1 ;
input d2 ;
input d3 ;
output reg  x ;
output reg  y ;



always @ (d0 or d1 or d2 or d3)
  if (d3 == 1)
  {x,y} = 3'b11 ;
else if (d2 == 1)
  {x,y} = 3'b10 ;
else if (d1 == 1)
  {x,y} = 3'b01 ;
else if (d0 == 1)
  {x,y} = 3'b00 ;
else
  {x,y} = 3'bxx ;

endmodule

module matrix_scan(co1,row,a1,b1,c1,d1);//a1~d1 is output

input [3:0] co1;
input [3:0] row;
output a1;
output b1;
output c1;
output d1;
prio_encoder4_2 en1(.d0(co1[0]) ,.d1(co1[1]) ,.d2(co1[2]) ,.d3(co1[3]) ,.x(a1) ,.y(b1) );
prio_encoder4_2 en2(.d0(row[0]) ,.d1(row[1]) ,.d2(row[2]) ,.d3(row[3]) ,.x(c1) ,.y(d1) );

endmodule

module add3(in,out);
input [3:0] in;

output [3:0] out;
reg [3:0] out;
matrix_scan aa(.co1(co1),.row(co1),.a(in[0]),.b(in[1]),.c(in[2]),.d(in[3]));//have problem here~!!!
always @ (in)       
 case (in)        
 4'b0000: out <= 4'b0000;       
 4'b0001: out <= 4'b0001;       
 4'b0010: out <= 4'b0010;       
 4'b0011: out <= 4'b0011;       
 4'b0100: out <= 4'b0100;       
 4'b0101: out <= 4'b1000;       
 4'b0110: out <= 4'b1001;       
 4'b0111: out <= 4'b1010;       
 4'b1000: out <= 4'b1011;       
 4'b1001: out <= 4'b1100;       
 default: out <= 4'b0000;      
  endcase
endmodule




module seg7 (bcd, leds);
	input [3:0] bcd;
	output [1:7] leds;
	reg [1:7] leds;
	
	always @(bcd)
		case (bcd)       //abcdefg
			0: leds = 7'b1111110;
	   		1: leds = 7'b0110000;
			2: leds = 7'b1101101;
			3: leds = 7'b1111001;
			4: leds = 7'b0110011;
			5: leds = 7'b1011011;
			6: leds = 7'b1011111;
			7: leds = 7'b1110000;
			8: leds = 7'b1111111;
			9: leds = 7'b1111011;
			default: leds = 7'bx;
		endcase
		
endmodule

 

[ads-ee]

We aren't going to do your homework for you...but I'll give you a hint.

The table in your picture of the problem statement shows that the codes that come out on ABCD need to be translated to BCD (i.e. Binary Coded Decimal). To perform logic transformation of some inputs into new outputs can be done by using a truth table.