CHECKSUM CALCULATION, Please Help!

[Charlie]

Interesting methof of doing CRC, but completely unrelated to the original question.

[falingtrea]

Take the ASCII value, subtract 0x30, if results is >9 then subtract 0x07. Value should then be in hex. If you want to bounds check then test result to make sure it is >= 0 and < 0x10. Then take the first packet hex value and leftshift by 4 and then add to hex value of second packet. Bitwise AND your calculated checksum with 0xFF and compare with the transmitted checksum.

[scrwld]

hi wasilus, tanks for you answer, these are examples used to calculate CRC16.

try this:

1.- $50 + $31 + $32 + $33 + $34 = $11A

2.- $11A / $100 = $1

3.- the carry = A

4.- Your checksum = 1A