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Made to simplyfy the communication between arduino code and ECUs using DS2 k-line protocol ISO 9141. It was made and tested for L9637D but any interface should work the same way.
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Look at example and drop 'libraries' folder into your library location.
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More info about the project on RomRaider Forum <==
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and MS4X.net wiki <==
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Echo - if you send any command on DS2 it responds with whatever was send due to way K-line is like constructed.
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Imagine K-line being a single guitar string and our TX is making it vibrate and our RX is constantly picking up this vibrations. This is echo
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1st byte in command/response is device which should receive command or which send the command 0x12 - ECU default
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2nd byte is command/response length
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3rd byte for response it's acknowledge byte A0 meaning positive response, B0 being negative and any other (usually FF) being error; for command is specific to command itself.
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4th - Xth bytes are for payload
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Last byte is always XOR checksum. You can use this calculator to get it: https://www.scadacore.com/tools/programming-calculators/online-checksum-calculator/
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Some commands for DS2 for BMW including MS41 / MS41.1 / MS41.2 / MS41.3 / MS42 / MS43:
- ECU id - {0x12, 0x04, 0x00, 0x16}
- General values - {0x12, 0x05, 0x0B, 0x03, 0x1F}
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