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#ibal234

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Adrian McEwen

A nice end to the working year.

Today some 22 ohm 0402 resistors turned up and I replaced the incorrect ones on the USB data lines on our My Bike's Got LED prototype boards.

With those two components replaced, the ESP32C3 could see the laptop's attempts to talk to it, and replied.

I can now flash code onto it over USB! 🎉

Screen grab of the tail end of a console session where some code has been uploaded to an ESP32C3 board. It finishes with the text "esp32c3dev_audioreactive SUCCESS"
#weeknotes#ibal234#esp32
Replied to Chris Huffee
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Adrian McEwen

Back on our hand-decoding USB from oscilloscope traces schtick.

@huffeec pointed out that they're Start-of-Frame packets rather than NAKs. (People who build protocols sending packets least-significant-bit first are even worse than those who use little-endian!)

At least now I (think) we're getting somewhere. Looks like the ESP32C3 is ignoring the computer for some reason.

An oscilloscope trace showing the tail end of one USB packet, a momentary pause, and then the start of the next one. That's indicated by two traces overlaid, which broadly show assorted square waves: one for D+ and one for D-, when they flip that shows a 0 and when they stay apart it indicates a 1; when both traces drop to their lowest points together that indicates the end of a packet. A couple of white cursor lines are also shown - they're set three bits apart to help as we scroll through the trace decoding the individual bits to then turn to bytes and then to USB packet types.
#weeknotes#ibal234#ESP32
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