build_rom.py: add new feature of exporting a C header file

BerkeleyLab · Dec 27, 2023 · 06e769d · 06e769d
1 parent a14c846
commit 06e769d
Showing 1 changed file with 36 additions and 5 deletions.
diff --git a/build-tools/build_rom.py b/build-tools/build_rom.py
@@ -90,7 +90,6 @@ def decode_array(a):
 def verilog_rom(a, suffix="", prefix=""):
     min_rom_size = 2048
     max_rom_size = 16384
-
     print("%d/%d ROM entries used" % (len(a), max_rom_size))  # Upper boundary for maximum ROM size, fixed
     if len(a) > max_rom_size:
         raise RuntimeError("ROM_size input exceeds MAX_ROM_SIZE")
@@ -118,6 +117,28 @@ def verilog_rom(a, suffix="", prefix=""):
     return '\n'.join(outputMessage)
 
 
+# New as of 2023-12-27.  Not as well tested as other routines here.
+def c_rom(a, suffix="", prefix=""):
+    min_rom_size = 2048
+    max_rom_size = 16384
+    print("%d/%d ROM entries used" % (len(a), max_rom_size))  # Upper boundary for maximum ROM size, fixed
+    if len(a) > max_rom_size:
+        raise RuntimeError("ROM_size input exceeds MAX_ROM_SIZE")
+        return ""
+    max_addr_size = opt_bus_width(len(a), min_rom_size, max_rom_size) - 1
+    d_list = ["0x%4.4x" % d for d in a]
+    d_list2 = [", ".join(d_list[ix*8:ix*8+8]) for ix in range((len(a)+7)//8)]
+    config_data = "  " + ",\n  ".join(d_list2)
+    outputMessage = ("// 16k x 16 ROM machine generated by python c_rom()",
+        "static uint16_t config_romx[] = {",
+        config_data,
+        "};",
+        "#define CONFIG_ROM_SIZE (%s)" % (2**max_addr_size),
+        ""
+        )
+    return '\n'.join(outputMessage)
+
+
 def opt_bus_width(entries, min_rom_size, max_rom_size):
     '''
     In order to limit blockRAM resource utilization, the port size has to be a function of ROM size.
@@ -186,6 +207,13 @@ def desc_limit_check(dev_desc):
         help='Destination config_rom filename',
         type=str,
         default='')
+    parser.add_argument(
+        '-c',
+        '--c_file',
+        dest='c_file',
+        help='Destination config_rom filename',
+        type=str,
+        default='')
     parser.add_argument(
         '-j',
         '--json',
@@ -235,9 +263,12 @@ def desc_limit_check(dev_desc):
             r = decode_array(a)
             for rr in r:
                 print(rr)
-        elif args.verilog_file == '':
-            print(len(a))
-            print(a)
-        else:
+        elif args.verilog_file != '':
             with open(args.verilog_file, 'w') as f:
                 f.write(verilog_rom(a, suffix=args.mod_suffix, prefix=args.mod_prefix))
+        elif args.c_file != '':
+            with open(args.c_file, 'w') as f:
+                f.write(c_rom(a, suffix=args.mod_suffix, prefix=args.mod_prefix))
+        else:
+            print(len(a))
+            print(a)