Support specifying the period to dump wave

Author: Undefined01

projects/soc/csrc/emu.h

@@ -24,15 +24,19 @@ class Emulator
 
     printf("Initializing DUT...\n");
     dut_ptr = new VysyxSoCFull;
-    dut_ptr->clock = 0;
-    dut_ptr->reset = 1;
-    dut_ptr->eval();
-    dut_ptr->clock = 1;
     dut_ptr->reset = 1;
-    dut_ptr->eval();
+    for (int i = 0; i < 10; i++)
+    {
+      dut_ptr->clock = 0;
+      dut_ptr->eval();
+      dut_ptr->clock = 1;
+      dut_ptr->eval();
+    }
+    dut_ptr->clock = 0;
     dut_ptr->reset = 0;
+    dut_ptr->eval();
 
-    if (args.dumpWave)
+    if (args.dump_wave)
     {
       Verilated::traceEverOn(true);
       printf("Enabling waves ...\n");
@@ -44,7 +48,7 @@ class Emulator
   }
   ~Emulator()
   {
-    if (args.dumpWave)
+    if (args.dump_wave)
     {
       fp->close();
       delete fp;
@@ -55,13 +59,11 @@ class Emulator
   {
     dut_ptr->clock = 1;
     dut_ptr->eval();
-    if (args.dumpWave)
-      fp->dump(++cycle);
-
+    cycle++;
+    if (args.dump_wave && args.dump_begin <= cycle && cycle <= args.dump_end)
+      fp->dump((vluint64_t)cycle);
     dut_ptr->clock = 0;
     dut_ptr->eval();
-    if (args.dumpWave)
-      fp->dump(++cycle);
   }
 
 private:
@@ -71,21 +73,23 @@ class Emulator
     int long_index;
     const struct option long_options[] = {
         {"dump-wave", 0, NULL, 0},
+        {"log-begin", 1, NULL, 'b'},
+        {"log-end", 1, NULL, 'e'},
         {"image", 1, NULL, 'i'},
         {"help", 0, NULL, 'h'},
         {0, 0, NULL, 0}};
 
     int o;
     while ((o = getopt_long(argc, const_cast<char *const *>(argv),
-                            "-hi:", long_options, &long_index)) != -1)
+                            "-hi:b:e:", long_options, &long_index)) != -1)
     {
       switch (o)
       {
       case 0:
         switch (long_index)
         {
         case 0:
-          args.dumpWave = true;
+          args.dump_wave = true;
           continue;
         }
         // fall through
@@ -95,25 +99,36 @@ class Emulator
       case 'i':
         args.image = optarg;
         break;
+      case 'b':
+        args.dump_begin = atoll(optarg);
+        break;
+      case 'e':
+        args.dump_end = atoll(optarg);
+        break;
       }
     }
 
     Verilated::commandArgs(argc, argv);
   }
+
   static inline void print_help(const char *file)
   {
     printf("Usage: %s [OPTION...]\n", file);
     printf("\n");
     printf("  -i, --image=FILE           run with this image file\n");
     printf("      --dump-wave            dump waveform when log is enabled\n");
+    printf("  -b, --log-begin=NUM        display log from NUM th cycle\n");
+    printf("  -e, --log-end=NUM          stop display log at NUM th cycle\n");
     printf("  -h, --help                 print program help info\n");
     printf("\n");
   }
 
-  int cycle = 0;
+  unsigned long long cycle = 0;
   struct Args
   {
-    bool dumpWave = false;
+    bool dump_wave = false;
+    unsigned long dump_begin = 0;
+    unsigned long dump_end = -1;
     const char *image = nullptr;
   } args;