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Every bus fails. Here is exactly how.

Most protocol tutorials show the correct sequence. These lessons show the failures, and give the check that finds each one. The labs operate in the browser. You need no hardware and no oscilloscope.

Track 01

Debugging the buses you ship on

The serial buses used in most embedded products, and the failures that each bus causes without an error message. Each lesson gives the check that finds the failure, and a lab that operates in the browser.

Debugging I²C

I²C uses two wires on one shared bus. Each device can only pull a line down. This lesson gives the four common failures. The failures are absent pull-up resistors, address conflicts, clock stretching, and incorrect probe connections. A check finds each failure.

Lesson 1 · ~14 min

Debugging SPI

Clock polarity or phase can be incorrect. A chip-select signal can be incorrect. A slave can continue to drive MISO. The bus can stop at one clock frequency.

Coming soon · ~12 min

Debugging CAN

A filter can discard every frame and give no message. Bit timing can set the controller to the bus-off state. An ISO-TP flow control failure can come from real hardware.

Coming soon · ~14 min

Debugging UART

TX and RX can connect incorrectly. Logic levels can disagree. A receiver overrun discards bytes. The system can look correct.

Coming soon · ~10 min

Track 02

Starting on the ESP32

The ESP32-S3-DevKitC-1 N16R8, from the first GPIO write to a sketch you flash. Each lesson gives the wiring, the program, and a lab that operates in the browser.

Getting started with the ESP32

Use the ESP32-S3-DevKitC-1 N16R8 in LabWired. Blink GPIO4. Read a button on GPIO5. Then join Wi-Fi and GET a page. Each step has connections, code, and a lab that you run in the page.

Lesson 1 · ~15 min

Track 03

Simulating mixed-signal boards

How LabWired steps an analog circuit next to your firmware, and how to read the result on an oscilloscope in the browser.

Co-simulation and mixed-signal

Attach an analog circuit to firmware in LabWired. Use the cosim_models manifest. The adapters are mock, external_process, and analog. Use the oscilloscope instrument.

Lesson 1 · ~10 min

3 lessons published. Want one on a bus we have not covered? Ask on r/labwired.