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  It sounds like your I2C works during setup but fails in the loop, which may indicate timing or bus handling issues on the STM32. Make sure you’re properly handling I2C interrupts and not blocking the bus in your main loop. Also, check that your I2C clock speed matches what the PPS module supports. STM32’s HAL I2C functions sometimes behave differently from Arduino’s Wire library, so review how you manage repeated start conditions and error handling. Double-check pull-up resistors on the I2C lines and confirm the voltage levels are stable at 3.3V during runtime.

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  When you meet problems using M5Stack, we help you solve it.

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  just load fresh firmware via M5Burner or easyloader demo version to check it out, I have Core basic which LCD stopped working few years ago after loading new project bizarre... but controller itself still works just I cant use screen

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  C

  @djairguilherme said in New ESPHome Support for M5StamPLC:

  Thanks ChirpyChips aka @Beormund.

  I used your implementation with ESPHome to interface with a Schneider Phase Inverter. I wrote a tutorial on Hackster.io.
  https://www.hackster.io/nicolaudosbrinquedos/m5stack-stamp-plc-as-real-plc-3ec3ed
  Thank you very much for your work!

  @djairguilherme Nice! At some point I really do need to utilise ESPHome's RS-485 support to expose the M5StamPLC's PWR-485 interface as a Modbus slave. It's on my TODO list.

• Cores

  Core2 for AWS M5Stack Fire M5stack Grey M5 Stick/StickC M5GO FACES Kit M5Stick V Core 2
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  I use M5Burner 202505131800
  Flashing fails with different symptoms:

  Maybe a year ago or more i had tried, and it always finisthed after an abnormally fast flash-progress (2-3sec.) with a success message, but then never showed anything on display, looked like dead.
  I could always return to UIFlow 1 Versions.

  Now i tried again, and after a few fails it worked one time, i saw the new UI. But i could not connect.
  So i flashed again with an older Version, 2.3.0 i think.
  But now the screen was black again. Pushing buttons plays the different pitch beeps, and the screen shows some of the elements:
  2cdbd858-a4fa-4647-9212-3849aadf62eb-WhatsApp Bild 2025-07-15 um 17.33.18_5c1d9b85.jpg

  I have two of the sticks, same issue with both...
  Again, i can return to UIFlow1, but no luck with UIFlow2.
  I tried multiple erases before flashing too, no change.

  Is this a known issue? Any ideas to fix it?

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  F

  Hello @xgonc

  no, I did not try any other Ethernet library.

  Thanks
  Felix

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  The error means I2S port 0 driver wasn’t installed before uninstall was called. Make sure you call i2s_driver_install() successfully before attempting i2s_driver_uninstall(). Also, check that your code isn’t trying to uninstall the driver twice or uninstall before install. Reviewing the initialization sequence and adding error checks after install calls should help fix this issue. If you’re using legacy I2S, consider updating to the latest driver APIs for better stability.