Update: 更新esptool ( version: 4.7.0 )

tools/python/esptool/uf2_writer.py

@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+#
+# SPDX-FileCopyrightText: 2020-2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Code was originally licensed under Apache 2.0 before the release of ESP-IDF v5.2
+
+import hashlib
+import os
+import struct
+from typing import List
+
+from util import div_roundup
+
+
+class UF2Writer(object):
+    # The UF2 format is described here: https://github.com/microsoft/uf2
+    UF2_BLOCK_SIZE = 512
+    # max value of CHUNK_SIZE reduced by optional parts. Currently, MD5_PART only.
+    UF2_DATA_SIZE = 476
+    UF2_MD5_PART_SIZE = 24
+    UF2_FIRST_MAGIC = 0x0A324655
+    UF2_SECOND_MAGIC = 0x9E5D5157
+    UF2_FINAL_MAGIC = 0x0AB16F30
+    UF2_FLAG_FAMILYID_PRESENT = 0x00002000
+    UF2_FLAG_MD5_PRESENT = 0x00004000
+
+    def __init__(
+        self,
+        chip_id: int,
+        output_file: os.PathLike,
+        chunk_size: int,
+        md5_enabled: bool = True,
+    ) -> None:
+        if not md5_enabled:
+            self.UF2_MD5_PART_SIZE = 0
+            self.UF2_FLAG_MD5_PRESENT = 0x00000000
+        self.md5_enabled = md5_enabled
+        self.chip_id = chip_id
+        self.CHUNK_SIZE = (
+            self.UF2_DATA_SIZE - self.UF2_MD5_PART_SIZE
+            if chunk_size is None
+            else chunk_size
+        )
+        self.f = open(output_file, "wb")
+
+    def __enter__(self) -> "UF2Writer":
+        return self
+
+    def __exit__(self, exc_type: str, exc_val: int, exc_tb: List) -> None:
+        if self.f:
+            self.f.close()
+
+    @staticmethod
+    def _to_uint32(num: int) -> bytes:
+        return struct.pack("<I", num)
+
+    def _write_block(
+        self, addr: int, chunk: bytes, len_chunk: int, block_no: int, blocks: int
+    ) -> None:
+        assert len_chunk > 0
+        assert len_chunk <= self.CHUNK_SIZE
+        assert block_no < blocks
+        block = struct.pack(
+            "<IIIIIIII",
+            self.UF2_FIRST_MAGIC,
+            self.UF2_SECOND_MAGIC,
+            self.UF2_FLAG_FAMILYID_PRESENT | self.UF2_FLAG_MD5_PRESENT,
+            addr,
+            len_chunk,
+            block_no,
+            blocks,
+            self.chip_id,
+        )
+        block += chunk
+
+        if self.md5_enabled:
+            md5_part = struct.pack("<II", addr, len_chunk)
+            md5_part += hashlib.md5(chunk).digest()
+            assert len(md5_part) == self.UF2_MD5_PART_SIZE
+
+            block += md5_part
+        block += b"\x00" * (self.UF2_DATA_SIZE - self.UF2_MD5_PART_SIZE - len_chunk)
+        block += self._to_uint32(self.UF2_FINAL_MAGIC)
+        assert len(block) == self.UF2_BLOCK_SIZE
+        self.f.write(block)
+
+    def add_file(self, addr: int, image: bytes) -> None:
+        blocks = div_roundup(len(image), self.CHUNK_SIZE)
+        chunks = [
+            image[i : i + self.CHUNK_SIZE]
+            for i in range(0, len(image), self.CHUNK_SIZE)
+        ]
+        for i, chunk in enumerate(chunks):
+            len_chunk = len(chunk)
+            self._write_block(addr, chunk, len_chunk, i, blocks)
+            addr += len_chunk