Avoid procedural wire assignment in test resource

Verilator 4.008 dropped the hammer on procedural wire assignment to
align with the IEEE standard (first I've heard of this, though). The
VerilogVendingMachine.v test resource will error in Verilator 4.008
with a PROCASSWIRE error if you try to compile it. This fixes that
example to only assign to a register.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

1 files changed, 25 insertions, 22 deletions

diff --git a/src/test/resources/chisel3/VerilogVendingMachine.v b/src/test/resources/chisel3/VerilogVendingMachine.v
index c01259bd..0902d1d2 100644
--- a/src/test/resources/chisel3/VerilogVendingMachine.v
+++ b/src/test/resources/chisel3/VerilogVendingMachine.v
@@ -10,35 +10,38 @@ module VerilogVendingMachine(
 );
   parameter sIdle = 3'd0, s5 = 3'd1, s10 = 3'd2, s15 = 3'd3, sOk = 3'd4;
   reg [2:0] state;
-  wire [2:0] next_state;
 
   assign dispense = (state == sOk) ? 1'd1 : 1'd0;
 
-  always @(*) begin
-    case (state)
-      sIdle: if (nickel) next_state <= s5;
-             else if (dime) next_state <= s10;
-             else next_state <= state;
-      s5: if (nickel) next_state <= s10;
-             else if (dime) next_state <= s15;
-             else next_state <= state;
-      s10: if (nickel) next_state <= s15;
-             else if (dime) next_state <= sOk;
-             else next_state <= state;
-      s15: if (nickel) next_state <= sOk;
-             else if (dime) next_state <= sOk;
-             else next_state <= state;
-      sOk: next_state <= sIdle;
-    endcase
-  end
-
-  // Go to next state
   always @(posedge clock) begin
     if (reset) begin
       state <= sIdle;
     end else begin
-      state <= next_state;
+      case (state)
+      sIdle: begin
+        if (nickel) state <= s5;
+        else if (dime) state <= s10;
+        else state <= state;
+      end
+      s5: begin
+        if (nickel) state <= s10;
+        else if (dime) state <= s15;
+        else state <= state;
+      end
+      s10: begin
+        if (nickel) state <= s15;
+        else if (dime) state <= sOk;
+        else state <= state;
+      end
+      s15: begin
+        if (nickel) state <= sOk;
+        else if (dime) state <= sOk;
+        else state <= state;
+      end
+      sOk: begin
+        state <= sIdle;
+      end
+      endcase
     end
   end
 endmodule
-