Added ASCII-to-HEX

Author: pConst

ascii2hex.sv

@@ -0,0 +1,52 @@
+//------------------------------------------------------------------------------
+// hex2ascii.sv
+// published as part of https://github.com/pConst/basic_verilog
+// Konstantin Pavlov, [email protected]
+//------------------------------------------------------------------------------
+
+// INFO ------------------------------------------------------------------------
+// Converts 8-bit human-readable ASCII char to 4-bit binary nibble
+// For example, "F" char becomes 4'b1111, "4" char becomes 4'b0100
+//
+
+
+/* --- INSTANTIATION TEMPLATE BEGIN ---
+
+ascii2hex AH (
+  .ascii(  ),
+  .hex(  )
+);
+
+--- INSTANTIATION TEMPLATE END ---*/
+
+
+module ascii2hex (
+  input  [7:0] ascii,
+  output [3:0] hex
+);
+
+  always_comb begin
+    case( ascii[7:0] )
+      8'd48        : hex[3:0] = 4'h0;
+      8'd49        : hex[3:0] = 4'h1;
+      8'd50        : hex[3:0] = 4'h2;
+      8'd51        : hex[3:0] = 4'h3;
+      8'd52        : hex[3:0] = 4'h4;
+      8'd53        : hex[3:0] = 4'h5;
+      8'd54        : hex[3:0] = 4'h6;
+      8'd55        : hex[3:0] = 4'h7;
+      8'd56        : hex[3:0] = 4'h8;
+      8'd57        : hex[3:0] = 4'h9;
+
+      8'd65, 8'd97 : hex[3:0] = 4'hA;  // lowercase and capital letters
+      8'd66, 8'd98 : hex[3:0] = 4'hB;
+      8'd67, 8'd99 : hex[3:0] = 4'hC;
+      8'd68, 8'd100: hex[3:0] = 4'hD;
+      8'd69, 8'd101: hex[3:0] = 4'hE;
+      8'd70, 8'd102: hex[3:0] = 4'hF;
+
+      default      : hex[3:0] = 4'h0;
+    endcase
+
+endmodule
+