Cleanups and improvements in examples/cmos/

examples/cmos/testbench_digital.sh

@@ -1,15 +1,15 @@
 #!/bin/bash
 
+set -ex
+
 # iverlog simulation
 echo "Doing Verilog simulation with iverilog"
-iverilog -o dsn counter.v counter_tb.v 
-./dsn -lxt2
-gtkwave counter_tb.vcd &
+iverilog -o counter_tb counter.v counter_tb.v 
+./counter_tb; gtkwave counter_tb.gtkw &
 
 # yosys synthesis
-set -ex
-
 ../../yosys counter_digital.ys
 
 # requires ngspice with xspice support enabled:
 ngspice testbench_digital.sp
+