Finally, he introduces the CRC reverse engineering tool reveng to determine which CRC polynomial and algorithm the protocol uses to frame each packet.Įven if you have no interest in Lightning cables, this video is a great tutorial on the types of things you need to do in order to make sense of an unknown communications protocol. For example, upon being plugged in, the host system queries the accessory’s serial number, manufacturer, model number, and product description. Aided by this tool, he digs deeper and learns more about the kinds of messages and their contents. It turns out that already wrote a SDQ analyzer module for the Saleae logic analyzer. Which embedded single-wire busses exist that encode bits with different lengths of low and high signals?Īt the basic level, 1-wire and protocols like Texas Instruments SDQ operate in a similar manner.
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