use the proper block count when publishing multipart UF2s

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

CHANGELOG.md

@@ -3,6 +3,12 @@
 Included is a summary of changes to the project. For full details, especially on behind-the-scenes code changes and
 development tools, see the commit history.
 
+## v0.8.2
+
+### Bugfixes
+
+* UF2 files made of parts now have the proper block counts.
+
 ## v0.8.1
 
 ### Improvements

gp2040ce_bintools/storage.py

@@ -65,6 +65,7 @@ def convert_binary_to_uf2(binaries: list[tuple[int, bytearray]]) -> bytearray:
     """
     total_blocks = sum([(len(binary) // 256) + 1 if len(binary) % 256 else len(binary) // 256
                         for offset, binary in binaries])
+    block_count = 0
 
     uf2 = bytearray()
     for start, binary in binaries:
@@ -78,12 +79,13 @@ def convert_binary_to_uf2(binaries: list[tuple[int, bytearray]]) -> bytearray:
                                0x00002000,                                      # familyID present
                                0x10000000 + start + index,                      # address to write to
                                256,                                             # bytes to write in this block
-                               index // 256,                                    # sequential block number
+                               block_count,                                     # sequential block number
                                total_blocks,                                    # total number of blocks
                                UF2_FAMILY_ID)                                   # family ID
             uf2 += binary[index:index+256] + bytearray(b'\x00' * pad_count)     # content
             uf2 += struct.pack('<L', UF2_MAGIC_FINAL)                           # final magic number
             index += 256
+            block_count += 1
     return uf2