Strange ESP32-S3 GPIO Issue

oceanlee
Posts: 1
Joined: Sat Dec 27, 2025 1:16 am

Strange ESP32-S3 GPIO Issue

Postby oceanlee » Sat Dec 27, 2025 1:25 am

I designed an ESP32 board myself using KiCad. During usage, I found that the external device could never be detected when the SPI interface was connected. After a long period of troubleshooting, I discovered that when I set the pins IO10, IO11, IO12 (marked on the schematic) to high level, the pins IO47, IO21, IO14 would also go high (I verified this with LED tests). However, when I switched to other GPIO pins, the SPI peripheral worked normally.I would like to ask what might be causing this issue :( . The circuit board was designed in KiCad, and the short-circuit test showed no problems (I measured pins like IO10 and IO47 with a multimeter and confirmed there was no short circuit between them).
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mikemoy
Posts: 687
Joined: Fri Jan 12, 2018 9:10 pm

Re: Strange ESP32-S3 GPIO Issue

Postby mikemoy » Mon Dec 29, 2025 4:30 pm

Show your code doing that.

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