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Andres Cao
Andres Cao
Associate III
March 1, 2017
Question

CubeMX bug on STM32F4 ADC config?

  • March 1, 2017
  • 5 replies
  • 1089 views
Posted on March 01, 2017 at 15:26

Hi guys!

I'm currently using the Nucleo 64 board with the STM32F446RE chip.

This microcontroller has 3 ADCs, which according to the reference manual (see pic), can be configured to run as ADC1+ADC in simultaneous mode, and ADC3 independently. This would be for my configuration, MULTI = 0b00110.

0690X00000606SGQAY.png

In this way I can use the ADC1+ADC2 to simultaneously sample current, and do other stuff with ADC3.

However, in CubeMX when I select Mode as ''Dual Regular Simultaneous Only'', ADC3 gets locked up in that same configuration (see pic).

0690X00000606SPQAY.png

Unless I misunderstood the Reference Manual, something would seem to be wrong.

Any clues?

    This topic has been closed for replies.

    5 replies

    Imen.D
    ST Technical Moderator
    March 3, 2017
    Posted on March 03, 2017 at 16:29

    Hi Andres,

    Which CubeMx version are you using ?

    Imen

    In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks
    Andres Cao
    Andres CaoAuthor
    Associate III
    March 3, 2017
    Posted on March 03, 2017 at 16:36

    Hi Imen,

    I'm using 'STM32 Cube V1.0 Version 4.19.0'.

    Is it possible to provide a sample code for the Nucleo64-446RE? 

    Thanks!!!

    Andres Cao
    Andres CaoAuthor
    Associate III
    March 3, 2017
    Posted on March 03, 2017 at 16:38

    Imen,

    I got topics mixed up, there's no sample code needed for this.

    Jeanne Joly
    Jeanne Joly
    Associate
    March 30, 2017
    Posted on March 30, 2017 at 16:19

    Hello

    Cao.Diego_Andres

    ,

    Indeed, it seems that CubeMX behaves wrongly on this specific point.

    We will keep you informed when we have a solution and when it will be deliviered.

    BR. Eric

    Jeanne Joly
    Jeanne Joly
    Associate
    May 9, 2017
    Posted on May 09, 2017 at 10:07

    Hello

    Cao.Diego_Andres

    ,

    After reading in detail the

    http://www.st.com/content/ccc/resource/technical/document/reference_manual/4d/ed/bc/89/b5/70/40/dc/DM00135pdf/files/DM00135pdf/jcr:content/translations/en.DM00135pdf

    doc, we observe that ADC1, 2 and 3 are working together and they take only one value (ADC3 don't take its own value if it works independently as you can see below :

    0690X00000606xrQAA.png

    ADC1, 2 and 3 are set in MULTI[4:0].

    As you already shown, here are the values that ADC1, 2 and 3 can take :

    0690X00000606xsQAA.png

    if you want to run as

    ADC1+ADC in simultaneous mode, and ADC3 independently, ADC1, 2 and 3 will take the value 00101 (as it is configured in CubeMX).

    And when you select this value for ADC1 (ADC2 and ADC3 are configured with this value as well as they are working together).

    So, for us, CubeMX is correctly configured.

    I hope it will help you.

    BR.Eric

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