I recently started working with the nRF54L15DK and nRF Connect SDK 2.9.1, and I wanted to share my experience with anyone else who might be facing similar challenges. I was trying to use I2C21 and SPI00, but I noticed that certain pins on the development kit were causing input and output errors for I2C, and SPI wasn’t working either. At first, I was a bit puzzled and wondered if there were specific pins designated for these protocols or if any GPIO pins could be used. After some research and experimentation, I found that the issue was related to the pin configuration and the way the signals were being handled. I ended up using specific pins designated for I2C and SPI, and that resolved the issue. If anyone else is struggling with similar problems, I’d be happy to help troubleshoot or share what I’ve learned. It’s always great to connect with others who are diving into these technologies!