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usb-cereal's Introduction

USB-Cereal

USB-Cereal is a debugging and development tool for designs that use USB-C port and bring out serial TX/RX lines into SBU1/2 pins. USB-Cereal is made compatible with both 1.8V and 3.3V signalling.

A few important things to note:

  • USB-Cereal is not an officially supported Google product.

  • USB-Cereal will not work as a USB-C hub/splitter. It is a development tool.

  • USB-Cereal device is not USB-C spec compliant tool. It will not work with and might damage target devices that hasn't been designed to work with USB-Cereal. Please use with caution and at your own risk.

Cereal Annotated

Please read getting started before plugging in the device. If used without caution, both USB-Cereal and target device could be damaged.

Cereal Block Diagram

Getting Started

  1. Determine correct serial signalling level on the target device - 1.8V or 3.3V. Incorrect voltage setting might permanently damage your device!
  2. Determine correct orientation - top vs. bottom - the tool operates correctly only when SBU1 pin corresponds to TX and SBU2 pin corresponds to RX.
  3. Serial log capture - please install ftdi232r drivers. Use your favorite serial monitoring console on the PC.

Avoid Damaging Target Device

USB-Cereal can operate both with 1.8V and 3.3V logic level systems. The transition from 1.8V to 3.3V is NOT automatic and is done via on-board DIP switch. Incorrect logic level setting might cause target device or USB-Cereal failure and/or permanent damage. If unsure of target device logic levels used, always start with 1.8V to avoid damaging the target device. USB-Cereal implements overvoltage clamp transistors, and is unlikely to get damaged from small overvoltage events.

Source Files

  1. Schematic diagram + board layout (Altium)
  2. Enclosure (STLs, STEP file exported from Autocad Fusion 360)
  3. No firmware/programming is required

License

This project is licensed under the Apache v2.0 License - see the LICENSE.md file for details

Contributing

Thank you for your interest - please review CONTRIBUTING.md!

usb-cereal's People

Contributors

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usb-cereal's Issues

How do we get one?

Hi, I know next to nothing about (micro)electronics and have no idea how I'd get something like this produced.

Is there any chance anyone has any interest in producing a run of these? Maybe there's reluctance given the disclosures on the README, but maybe it could be an exclusively community effort to get a small run made? I have no idea how much it would cost, but I'd splurge to have one of these.

(Well, I know enough to know I want one to replace my existing uart setup...)

What devices is this known to work on?

Hi. The readme notes that this may damage devices that aren't designed to work with usb-cereal, which begs the question, what devices is this known to work on? It would be great if this information was documented somewhere.

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