Frame Check Sequence (FCS) = Cyclic Redundancy Check (CRC)

Blockprüfzeichenfolge (BPF)

CRC Implementation Code in C, very detailed description
Zyklische Redundanzprüfung
A Painless Guide to CRC Error Detection Algorithms

YouTube

How do CRCs work?
Cyclic Redundancy Check ( incl. Examples and Step-By-Step Guide) – Computer Networks
CRC – Cyclic Redundancy Check
CRC error detection in embedded applications
CRC Implementation

Forum

CRC32: C Implemtierung OHNE Lookup-Table
CRC32 C or C++ implementation
CRC-CCITT Implementation
How is a CRC32 checksum calculated?

Only pure implementation

CRC library with routines to check for errors in the data transfer.

CRC-32

CRC-32 in different programming languages
crc32.c, Apple

CRC-16

crc16.c, mikrocontroller.net
CRC-16 Prüfsumme (serielle Übertragung), mikrocontroller.net
crc-16.c, www8.cs.umu.se/~isak/snippets/crc-16.c‎
CRC-16-CCITT

Calculate / Test

Online CRC Calculator
On-line CRC calculation and free library
Calculate 16 bit and 32 bit CRC’s
Catalogue of parametrised CRC algorithms with 16 bits
Summary of the CRC Catalogue

GitHub

github.com/bxparks/AceCRC, Cyclic Redundancy Check (CRC) algorithms (e.g. crc16ccitt, crc32) programmatically converted from C99 code generated by pycrc (https://pycrc.org) to Arduino C++ using namespaces and PROGMEM flash memory.