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fix checksum calculation code #12

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fix checksum calculation code #12

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d9f69be
fix checksum calculation code
almontasser Jul 18, 2024
3306926
fix type
almontasser Jul 18, 2024
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5 changes: 3 additions & 2 deletions protocol.md
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Original file line number Diff line number Diff line change
Expand Up @@ -337,8 +337,9 @@ while j<len(payload):
# increment index by 2 bytes
j += 2

# adds the two first bytes to the other two bytes
chk_32b = (chk_32b & 0xffff) + ((chk_32b & 0xffff0000)>>16)
# Fold carry bits into the lower 16 bits
while (chk_32b & 0xffff0000) != 0:
chk_32b = (chk_32b & 0xffff) + (chk_32b >> 16)

# calculate ones complement to get final checksum (in big endian)
chk_16b = chk_32b ^ 0xFFFF
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