feat(rom): inital ROM data writer code

rom.py

@@ -0,0 +1,58 @@
+import git
+
+segment_font = {
+    " ": 0b00000000,
+    "0": 0b00111111,
+    "1": 0b00000110,
+    "2": 0b01011011,
+    "3": 0b01001111,
+    "4": 0b01100110,
+    "5": 0b01101101,
+    "6": 0b01111101,
+    "7": 0b00000111,
+    "8": 0b01111111,
+    "9": 0b01101111,
+    "A": 0b01110111,
+    "B": 0b01111100,
+    "C": 0b00111001,
+    "D": 0b01011110,
+    "E": 0b01111001,
+    "F": 0b01110001,
+    "t": 0b01111000,
+}
+
+def segment_char(c):
+    return segment_font[c]
+
+class ROMFile:
+    def __init__(self, config, projects):
+        self.projects = projects
+        self.config = config
+
+    def get_git_remote(self):
+        return list(git.Repo(".").remotes[0].urls)[0]
+
+    def get_git_commit_hash(self):
+        return git.Repo(".").commit().hexsha
+
+    def write_rom(self):
+        rom = bytearray(256)
+        short_sha = self.get_git_commit_hash()[:8]
+
+        rom_text = f"shuttle={self.config['name']}\n"
+        rom_text += f"repo={self.get_git_remote()}\n"
+        rom_text += f"commit={short_sha}\n"
+
+        print(rom_text)
+        assert len(rom_text) < 96, "ROM text too long"
+
+        rom[0:4] = map(segment_char, "tt04")
+        rom[8:16] = map(segment_char, short_sha.upper())
+        rom[32 : 32 + len(rom_text)] = rom_text.encode("ascii")
+
+        # build complete list of filenames for sim
+        with open("verilog/includes/rom_tile.vmem", "w") as fh:
+            for line in range(0, len(rom), 16):
+                for byte in range(0, 16):
+                    fh.write("{:02x} ".format(rom[line + byte]))
+                fh.write("\n")