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Published 20 hours ago • verified publisher icon wokwi

STM32 keeps SDA low.

Open Koepel opened this issue 11 months ago • 0 comments
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It was mentioned in the Discord channel that the SDA was kept low after a I2C read with HAL_I2C_Master_Receive(). After that, no more I2C communication is possible.

It turns out that the same bug happens with Arduino functions as well. My test projects:

  • Arduino Uno: https://wokwi.com/projects/416454390210677761
  • Rasperry Pi Pico: https://wokwi.com/projects/416454423403356161
  • ESP32: https://wokwi.com/projects/416454431364149249
  • STM32 small board: https://wokwi.com/projects/416454402880623617
  • STM32 large board: https://wokwi.com/projects/416454414236703745

The I2C signals for the Arduino Uno are perfect: afbeelding

Both STM32 boards show something different: afbeelding The Master gives an ACK for that last databyte and SDA stays low.

Koepel avatar Dec 05 '24 17:12 Koepel