Stm32CubeF4 I2C examples for different boards

[Malek Mahar]

Hi,

Im trying to establish an I2C communication between stm32f446nucleo board and stl32f469i disco board,​

I flashed the stm32f446-nucleo I2C master code example from cubeF4stm32f446 into an stm32f446 nucleo board and the slave I2C code example from cubeF4-stm32f496i disco into an stm32f469i disco board,

As a result i get an indication ( LedToggle ) that there was an error during communication,

Is what I did correct ?

[Mike_ST]

Hello,

Have you tried to debug, do you see something on the I2C lines ?

[Malek Mahar]

Yes I did, the problem was related to the hardware part, SDA and SCL not changing from HIGH to LOW,

thank you for your answer

[Amel NASRI · Accepted solution]

Hi @Malek Mahar​ ,

If problem is still there, I have some proposals/questions:

• is there any error flag set in I2C status register while debugging?
• make sure to add GND wires (refer to readme files for each example where used pins are precised)
• make sure that you choose properly between Master and Slave through "#define MASTER_BOARD" in the "main.c" file

-Amel

[Malek Mahar]

hI @Amel NASRI​ ,

https://community.st.com/s/question/0D53W00000sqQt9SAE/i2c-between-two-stm32-boards-not-working

this is a more detailed post just I have just published,

thank you,