George Hotz | Programming | comma ai | work GMLAN bitbang CAN (Gmbitbang) | Sunday special | Part1 | Summary and Q&A

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June 11, 2018
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George Hotz | Programming | comma ai | work GMLAN bitbang CAN (Gmbitbang) | Sunday special | Part1

TL;DR

  • Successfully debug GM Lan communication using Rigol oscilloscope on macOS.

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Key Insights

  • 🫦 Bit Banging can help control and send data bits, aiding in the debugging process.
  • 🫦 Paying attention to detail like bit stuffing protocols can ensure data integrity in communication.
  • 📡 Understanding the role of CRC in signaling protocols is crucial for data validation.

Transcript

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Questions & Answers

Q: Why was the oscilloscope not correctly displaying the signal?

The issue could have been due to the presence of interrupts or incorrect GPIO output settings.

Q: How did the use of Bit Banging help in GM Lan debugging?

Bit Banging allowed for more control while sending data bits to the transceiver, aiding in the debugging process.

Q: What role does CRC (Cyclic Redundancy Check) play in communication protocols?

CRC is used to verify the accuracy of transmitted data and ensure data integrity between sender and receiver.

Q: Why are bit stuffing mechanisms necessary in communication protocols?

Bit stuffing helps prevent synchronization issues between sender and receiver by adding bits for encoding and decoding stability.

Summary & Key Takeaways

  • Attempted to debug GM Lan using Bit Banging technique with a USB oscilloscope.

  • Discovered the importance of not forgetting to recompile the code after making changes.

  • Implemented bit stuff protocol to ensure correct data transmission.

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