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joohyun lee
joohyun lee
Visitor II
March 28, 2018
Question

stm32f0DISC board i2c device communication problem

  • March 28, 2018
  • 2 replies
  • 715 views
Posted on March 28, 2018 at 04:38

I'm using stm32f051R8Tx(stm32f0discovery) and I'm trying to connect with i2c devices

I used HAL-driver that CUBEMX provides and i succeeded  to communicate with i2c LCD device(LCD1602A).

LCD works really well.

However, I also used mpu6050, i2c gyro sensor, in a same code, I cannot get this thing work.

I used debug session and it seems like acknowledge problem.

there are some people who have similar issues and they solved this problem with shifting address to the left.

so I tried address left shifting as well but mine doesn't work. 

anybody can help? 

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    2 replies

    Andrew Neil
    Andrew Neil
    Super User
    March 28, 2018
    Posted on March 28, 2018 at 09:41

    I'm using stm32f051R8Tx(stm32f0discovery)

    So this: 

    http://www.st.com/en/evaluation-tools/stm32f0discovery.html

     ?

    I also used mpu6050, i2c gyro sensor, in a same code, I cannot get this thing work.

    Do they work individually?

    None of these things is actually part of the 

    stm32f0discovery - so you must have added them externally.

    How have you confirmed that your wiring is correct?

    I used debug session and it seems like acknowledge problem.

    That's a good start - so what further investigation/testing/debugging have you done based on that observation?

    http://www.8052mcu.com/faqs/120313

     

    The obvious first question (after checking wiring) is: do you have the Slave Addresses correct?

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    GenuineDeveloper
    GenuineDeveloper
    Associate III
    March 28, 2018
    Posted on March 28, 2018 at 11:40

    so I tried address left shifting as well but mine doesn't work.

    How did you left shift the address?

    Are you using the same code for all the other devices you mentioned? If that's the case, do pay attention to I2C timing register values(derived from Cube MX), Slave address? I2C pull-up resistors?

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