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Also, the much slower modulo operator is likely just to model the ADC operator that it likely used in asm.
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I think the confusion here is that Fletcher's checksum utilizes both modulo 255 addition and taking the one's complement as the final step. No, Modulo 255 is not equivalent to One's Complement.
FLETCHER CHECKSUM CALCULATOR CODE
Short code snippet from the Fletcher Wiki page: for( index = 0 index < count ++index ) The interesting part is seen below) // Fold 32-bit sum to 16 bits //Ī few days ago I found out about the Fletcher checksum: Fletcher article Fletcher implementation Fletcher Wikipedia My one's complement checksum implementation is very similar to Internet checksum (page 7. Right now I'm using COBS byte stuffing with 0x00 packet delimiter bytes and a simple 1-byte checksum that is either a two's complement running sum or a one's complement sum. I'm working on a small hobby project with a microcontroller communicating with a PC over UART.