Update alchitry_top.luc

dheijl · Nov 16, 2024 · a1ecb69 · a1ecb69
1 parent 1700987
commit a1ecb69
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/IO_experiments/source/alchitry_top.luc b/IO_experiments/source/alchitry_top.luc
@@ -133,22 +133,22 @@ module alchitry_top (
         } else if (prv) { // previous digit position
             digit_index.d = digit_index.q - 1
         } else if (enter) { // advance state machine
-            digit_index.d = 0 // reset to 1st digit
             case (state.q) {
                 State.A:
                     a.d = digit_adder.q // remember x value
-                    digit_adder.d = 4x{{4h0}}
                     state.d = State.B // set next state
                 State.B:
                     b.d = digit_adder.q // remember y value
-                    digit_adder.d = 4x{{4h0}}
                     state.d = State.SUM // set next state (activates bcd adder)
                 State.SUM:
                     state.d = State.A // set next state
                 default:
                     // should not happen
                     state.d = State.A
             }
+            // clean-up for next state
+            digit_adder.d = 4x{{4h0}} // clear a or b
+            digit_index.d = 0 // reset to enter 1st digit
         }
 
         usb_tx = usb_rx        // loop serial port