Added "no default" top; minor bug fix in error message in la2vcd

README.md

@@ -71,3 +71,15 @@ This will prompt you for a name so enter "counter8" and press OK. Now you'll hav
 
 Of course, this is painful to set up every time so use Write Save File on the File menu. This will save the layout for next time you load a VCD with the same format.
 
+# Note about Quartus and possibly other synthesis tools
+Quartus requires that you enable System Verilog for the config file parameters to work.
+
+Many synthesizers will accept module definitions like this:
+ module foo(input bar=1'b1);
+
+Quartus appears to not accept these even in System Verilog mode. To work around this
+you can use top_of_verifla_nodef instead of top_of_verifla_nodef. In this case,
+you need to provide inputs (even if constants) for sys_run, cqual, trigqual, and exttrig.
+
+The code has been lightly tested on an MAX10 FPGA and there will be examples in the demos
+folder soon.

c/la2vcd.c

@@ -24,11 +24,13 @@ A complete set of capture bytes and the associated repeat bytes are a line
 
 void help()
 {
- fprintf(stderr,"Usage: la2vcd [-B] [-W] [-F frequency] [-T timescale] -b baud, -t trigger_pos -c cap_width, -r repeat_width, -n samples -o vcd_file port_name\n");
+ fprintf(stderr,"Usage: la2vcd [-B] [-W] [-V] [-F frequency] [-T timescale] -b baud, -t trigger_pos -c cap_width, -r repeat_width, -n samples -o vcd_file port_name\n");
  fprintf(stderr,"You need all the lower case options, although baud will default to 9600\n");
  fprintf(stderr,"-B output only bytes of capture\n-W output only words (default is both bytes and words)\n");
  fprintf(stderr,"-F sets frequency in MHz (e.g., -F 250).\n"
- "Or you can set the timescale (e.g, -T 1ns) with -T. Note the timescale should be twice the clock frequency. Default to 1nS and you do your own math.\n");
+ "Or you can set the timescale (e.g, -T 1ns) with -T. Note the timescale should be twice the clock frequency. Default to 1nS and you do your own math.\n"
+ "-V causes a console message when reading serial data\n"
+ );
  fprintf(stderr,"Al Williams [email protected]\n");
  exit(1);
 }
@@ -118,6 +120,7 @@ int main(int argc, char *argv[])
  char *vcdfile=NULL;
  char *timescale="1ns";
  float freq=-1;
+ int verbose=0;
 
  unsigned char *workbuf;
  FILE *vfile;
@@ -133,9 +136,13 @@ int main(int argc, char *argv[])
  }
 
  // process command line
- while ((copt=getopt(argc,argv,"DF:T:BWb:c:r:n:o:t:")) != -1)
+ while ((copt=getopt(argc,argv,"BDF:T:VWb:c:n:o:r:t:")) != -1)
  switch (copt)
  {
+ case 'V':
+ verbose=1;
+ break;
+
  case 'D':
  debugging=1; // undocumented debug flag
  break;
@@ -216,7 +223,7 @@ int main(int argc, char *argv[])
  err=sp_open(port,SP_MODE_READ_WRITE);
  if (err!=SP_OK)
  {
- fprintf(stderr,"Can't open port %s\n",argv[1]);
+ fprintf(stderr,"Can't open port %s\n",argv[optind]);
  exit(2);
  }
  sp_set_baudrate(port,BAUD); 
@@ -227,20 +234,24 @@ int main(int argc, char *argv[])
  i=USERCMD_RUN;
  sp_blocking_write(port,&i,1,100);
  // read data (note data is backwards!)
- for (i=0;i<count;i++) 
+ for (i=0;i<count;i++)
  {
  int waiting;
- int c;
+ unsigned int c;
+ int n;
  do 
  {
  waiting=sp_input_waiting(port);
- } while (waiting<=0);
- sp_nonblocking_read(port,(void *)&c,1);
- workbuf[(count-1)-i]=c;
+ } while (waiting<=0); 
+
+ if ((n=sp_nonblocking_read(port,(void *)&c,1))<0) fprintf(stderr,"Serial error: %s\n",sp_last_error_message());
+ if (verbose)
+ workbuf[(count-1)-i]=c;
  }
+ if (verbose) putchar('\n');
  sp_close(port);
 
- if (debugging)
+ if (0 /*debugging */)
  {
  int q;
  FILE *dfile=fopen("debug.txt","w");