i2c to communicate two STM32F103C8T6

SSaya.1 · ‎2021-12-14

hello,

i am trying i2c to communicate two stm32f103c8t6 . It is not working. logic analyzer output is shown in picture.

what can be done for i2c to communicate two stm32f103c8t6

address 0x00

TDK · ‎2021-12-15

0x00 shouldn't be used as a slave address as it's a general call address. The logic analyzer plot is otherwise a valid I2C signal. If the slave is not responding, it's probably a code issue. Although it seems like it is responding about every other time, so this suggests the slave is not ready when the master sends the message.

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Imen.D · ‎2021-12-15

Hello @SSaya.1 ,

I advise you to have a look at this FAQ: STM32 I2C does not work, which describes few tips related to I2C peripherals.

I suggest also to check the I2C example available in STM32CubeF1 MCU package and compare your own code/configuration to identify what is going wrong with your project.

When your question is answered, please close this topic by choosing Select as Best.

Imen

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Thanks
Imen

TDK · ‎2021-12-15

0x00 shouldn't be used as a slave address as it's a general call address. The logic analyzer plot is otherwise a valid I2C signal. If the slave is not responding, it's probably a code issue. Although it seems like it is responding about every other time, so this suggests the slave is not ready when the master sends the message.

If you feel a post has answered your question, please click "Accept as Solution".

SSaya.1 · ‎2021-12-15

thank you, I2C worked, i had no idea about I2C plotting by logic analyzer before