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  • March 16, 2017 at 1:52 am #6558
    tanveer.fuad
    Participant

    Hi, I am new to STM32. I am trying to create a communication channel, using the I2C protocol. I used the code from the book(Ch14 Ex1and Ex2).

    After I took the code from the git repository, I compiled and created the bin file and flashed it using a Mac. After that, I tried to use a mixed signal oscilloscope(HP 54645D) to probe the relevant pin for CLK(I probed all of D15, D14, D10, and PB7), but I can only see a sinusoidal at the oscilloscope.

    Could anyone suggest why I see a sinusoidal, when the clock should be a pulse? Is there any other way to check whether the I2C submission is working fine?

    Could you suggest any example from the book, where I could see ANY pulse on the scope?

    Thanks in advance.

    March 23, 2017 at 4:07 pm #6608
    svobodv
    Participant

    Hi,
    are you using external pull-ups?

    V.

    March 24, 2017 at 4:25 pm #6620
    Ron Fracchia
    Participant

    Hi,

    What is the period of the sine wave that you are seeing? Is it possible that the ground connection between your board and the ‘scope is open?

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