CONFLICT WHEN USING I2C1 STM32F4 DISCOVERY

[bacnk]

I use STM32F4 Discovery, and when using I2C1 for communication, I encounter a situation where the chip becomes unresponsive while using UART and during operation with I2C1. When I use other I2C interfaces, it works normally. I want to understand what is causing I2C1 to make the chip unresponsive.

When I use other I2C interfaces, the response is only within 100ms, but when using this I2C interface, the response takes several seconds

thanks you

[Andrew Neil]

Have you checked the board's User Manual and/or Schematics to see if there's anything else on that pin?

Example just now:

https://community.st.com/t5/stm32-mcus-products/low-voltage-for-logic-high-on-nucleo-g431kb/td-p/737306

[Imen.D]

Hello @bacnk 

Make sure that there are no resource conflicts between I2C1 and other peripherals and that I2C1 is correctly initialized and configured in your code.

I advise you to enable timeout register and use an oscilloscope or logic analyzer to monitor the I2C bus.