1 files changed, 63 insertions, 0 deletions
diff --git a/atk16_utils/charmem.py b/atk16_utils/charmem.py
new file mode 100644
index 0000000..aaac122
--- /dev/null
+++ b/atk16_utils/charmem.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+# Generate .bin file with ATK16 CPU TPU charmem data
+
+# Addressed by _CCC CCCC CYYY
+# Data width 8bit: ___X XXXX
+# where _ = unused, C = 8bit character code, Y = character y coordinate, X = pixel value
+
+import sys
+
+if len(sys.argv) != 2:
+  print("usage: charmem.py <outfile.bin>")
+  sys.exit(1)
+
+outfile_path = sys.argv[1]
+
+with open("charset.txt", "r") as f:
+  lines = [s.strip("\n") for s in f.readlines()]
+
+header_chars = lines[0]
+
+charset: list[list[str]] = []
+
+CHAR_HEIGHT = 8
+CHAR_WIDTH = 8
+
+i = 0
+while i < len(lines):
+  i += 1 # skip comment line
+  char = lines[i:i+CHAR_HEIGHT]
+  for row in char:
+    if len(row) != CHAR_WIDTH:
+      raise Exception(f"char row number {i} has width != {CHAR_WIDTH}: {len(row)}\n" + row + "\n" + "\n".join(char))
+  charset.append(char)
+  i += CHAR_HEIGHT + 1
+
+CHAR_N = len(charset)
+
+TOTAL_BYTEARRAY_SIZE = CHAR_N * CHAR_HEIGHT
+
+def string_to_byte(input_string: str):
+    # Replace spaces with '0' and '#' with '1'
+    binary_string = input_string.replace(' ', '0').replace('█', '1')
+
+    assert(len(input_string) == CHAR_WIDTH)
+
+    # Check if the string contains only '0' or '1'
+    if not all(c in '01' for c in binary_string):
+        raise ValueError("Input string must contain only spaces and '█' characters.")
+
+    # Convert the binary string to an unsigned integer byte
+    return int(binary_string[::-1], 2)
+
+
+res_b = bytearray(TOTAL_BYTEARRAY_SIZE)
+for cn, char in enumerate(charset):
+  for cy in range(0, CHAR_HEIGHT):
+    addr = (cn << 3) + cy
+    byte = string_to_byte(char[cy])
+    print(f"{byte:>08b}")
+    res_b[addr] = byte
+
+with open(outfile_path, "wb") as f:
+  f.write(res_b)