esptool.py 文件源码

def __init__(self, load_file=None):
        super(ESPFirmwareImage, self).__init__()
        self.flash_mode = 0
        self.flash_size_freq = 0
        self.version = 1

        if load_file is not None:
            (magic, segments, self.flash_mode, self.flash_size_freq, self.entrypoint) = struct.unpack('<BBBBI', load_file.read(8))

            # some sanity check
            if magic != ESPROM.ESP_IMAGE_MAGIC or segments > 16:
                raise FatalError('Invalid firmware image magic=%d segments=%d' % (magic, segments))

            for i in range(segments):
                self.load_segment(load_file)
            self.checksum = self.read_checksum(load_file)