uf2_to_bin.py

# uf2_to_bin.py - Convert UF2 to BIN format
import sys
import struct

def uf2_to_bin(uf2_file, bin_file):
    with open(uf2_file, 'rb') as f:
        uf2_data = f.read()
    
    # UF2 block structure
    blocks = []
    pos = 0
    while pos < len(uf2_data):
        block = uf2_data[pos:pos+476]
        if len(block) < 476:
            break
        
        # Parse UF2 header
        magic1 = struct.unpack('<I', block[0:4])[0]
        if magic1 != 0x0A324655:  # "UF2\n"
            pos += 476
            continue
        
        target_addr = struct.unpack('<I', block[12:16])[0]
        payload_size = struct.unpack('<I', block[16:20])[0]
        payload = block[20:20+payload_size]
        
        blocks.append((target_addr, payload))
        pos += 476
    
    # Determine address range
    min_addr = min(b[0] for b in blocks)
    max_addr = max(b[0] + len(b[1]) for b in blocks)
    
    # Create binary
    binary = bytearray(max_addr - min_addr)
    for addr, data in blocks:
        offset = addr - min_addr
        binary[offset:offset+len(data)] = data
    
    with open(bin_file, 'wb') as f:
        f.write(binary)
    
    print(f"Converted {uf2_file} to {bin_file}")
    print(f"Size: {len(binary)} bytes (0x{len(binary):X})")

if __name__ == "__main__":
    uf2_to_bin("firmware.uf2", "firmware.bin")