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Francesco1
Graduate
November 15, 2024
Solved

Problem with a STM32F746G-DISCO Board and an Arduino shield

  • November 15, 2024
  • 1 reply
  • 1954 views

Hi all,

I have an STM32F746G-DISCO board bought some years ago and I am trying to use it with a Pololu Dual VNH5019 Motor Driver Shield for Arduino (https://www.pololu.com/product/2507) to drive a DC motor.

I successfully created a TouchGFX application with a couple of buttons and a slider with which I can control the START/STOP status of the motor and the duty cycle of a PWM signal which controls its speed.

The shield uses Arduino signals D2, D4 as Motor 1 Direction inputs A and B respectively, D6 as Motor 1 enable signal and D9 as PWM signal.

All signals work correctly except D4 ( = M1INB) which from the schematic diagram of the discovery board should correspond to signal PG7. Unfortunately PG7 seems to be not available at all in the GPIO configuration panel of the board in STM32CubeMX.

I don't not if this could be a problem with the particular revision of the discovery board I have.

Unfortunately I am unable to find its revision (I bought it some years ago), but I attach a couple of photos to this post in the hope someone can help me to correctly identify it.

Any help will be appreciated.

Thanks in advance for your help.

 

    This topic has been closed for replies.
    Best answer by CYANG.1

    Hi,

    Maybe I missed something. But when PG7 is in grey, that means it was not assigned. so PG7 is not shown in the left table. After you assign PG7 as a GPIO and the ball will turn green, then PG7 will be listed in the table.

    1 reply

    C
    CYANG.1
    ST Employee
    November 18, 2024

    Hi,

    What you mean "Unfortunately PG7 seems to be not available at all in the GPIO configuration panel of the board in STM32CubeMX"?

    I checked cubemx for STM32F746G-DISCO, PG7 is on the map and is assigned to D4 of arduino connector. You can see the figure attached.

    And you board seems a newer version, so I don't think there are limitations on the board without any comments in UM.

    You could check PG7 by setting it as a normal GPIO with a square waveform and measure the signal on Arduino connector to check whether PG7 is well connected on your board.

     

    B.R.

    C
    CYANG.1Answer
    ST Employee
    November 18, 2024

    Hi,

    Maybe I missed something. But when PG7 is in grey, that means it was not assigned. so PG7 is not shown in the left table. After you assign PG7 as a GPIO and the ball will turn green, then PG7 will be listed in the table.

    F
    Francesco1Author
    Graduate
    November 18, 2024

    Hi @CYANG.1,

    of course you are right; the problem was that PG7 was not initialized at all by the TouchGFX code generator. My limited experience with STM32CubeMX made the rest... 

    Sorry for this *** mistake and thank you for your patience.

    Cheers.

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