From 4b041651d492e2838d86565ce825953d12eeab29 Mon Sep 17 00:00:00 2001
From: dilanthi <dilanthi@pdx.edu>
Date: Sat, 17 May 2025 20:38:52 -0700
Subject: [PATCH] added seven segment display logic / seconds counter

---
 design/display_converter.sv | 60 +++++++++++++++++++++++++++++++++++++
 design/seconds_display.sv   | 31 +++++++++++++++----
 2 files changed, 85 insertions(+), 6 deletions(-)
 create mode 100644 design/display_converter.sv

diff --git a/design/display_converter.sv b/design/display_converter.sv
new file mode 100644
index 0000000..acc9d8e
--- /dev/null
+++ b/design/display_converter.sv
@@ -0,0 +1,60 @@
+/**
+* display_converter.sv - decodes a 5 bit digit input into its seven segment
+*                        display equivalent using a lookup table. Display can
+*                        do 0 - 9, A - F, individual segmentsm and special
+*                        characters.  
+* @author: Dilanthi Prentice, Waylon Cude
+* @date: [not sure when its due yet]
+*
+*
+****/
+module display_converter(
+    input logic [4:0] digit, 
+    output logic [6:0] segment
+);
+
+localparam ROM_SIZE=32;
+
+//ROM lookup table for seven segment display
+localparam logic [6:0] segment_rom [0:ROM_SIZE-1] = '{
+    7'b1111110, //0
+    7'b0000110, //1
+    7'b1101101, //2
+    7'b1111001, //3
+    7'b1011011, //4
+    7'b1011011, //5
+    7'b1011111, //6
+    7'b1110000, //7
+    7'b1111111, //8
+    7'b1111011, //9
+
+    7'b1110111, //A
+    7'b0011111, //B
+    7'b1001110, //C
+    7'b0111101, //D
+    7'b1001111, //E
+    7'b1000111, //F
+
+    7'b1000000, //segment a
+    7'b0100000, //segment b
+    7'b0010000, //segment c
+    7'b0001000, //segment d
+    7'b0000100, //segment e
+    7'b0000001, //segment f
+
+    7'b0110111, //H
+    7'b0001110, //L
+    7'b1110111, //R
+    7'b0000110, //l 
+    7'b0000101, //r
+
+    7'b0000000, //blank
+    7'b0000000, //blank
+    7'b0000000, //blank
+    7'b0000000, //blank
+    7'b0000000  //blank
+};
+//use digit input to index segment_rom lookup table.
+assign segment = segment_rom[digit];
+
+endmodule
diff --git a/design/seconds_display.sv b/design/seconds_display.sv
index 5ea6b3e..f715a3a 100644
--- a/design/seconds_display.sv
+++ b/design/seconds_display.sv
@@ -1,10 +1,29 @@
-module seconds_display(
-    input logic clk, 
-    input logic reset, 
-    input [$clog2(60)-1:0] counter,
-    output [7:0] display_tens,
-    output [7:0] display_ones
+/***
+* seconds_display.sv - convert a seconds counter to a seven segement display.
+*
+* @author: Dilanthi Prentice, Waylon Cude
+* @date:[unsure of due date]
+*
+*/
+module seconds_display
+(
+    input [$clog2(60)-1:0] seconds,
+    output [6:0] display_tens,      
+    output [6:0] display_ones       
 );
 
+logic [4:0] ones_digit; 
+logic [4:0] tens_digit;
+
+always_comb
+begin
+    ones_digit = seconds % 10;
+    tens_digit = seconds / 10;
+end
+
+//instantiate the display_converter to convert the counter
+//to a seven segment display number
+display_converter ones (ones_digit, display_ones);
+display_converter tens (tens_digit, display_tens);
 
 endmodule