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geoffrey
geoffrey
Associate
January 19, 2015
Question

USB on stm32f103

  • January 19, 2015
  • 4 replies
  • 1131 views
Posted on January 20, 2015 at 00:39

Hi,

I'm trying to use a mass storage example taken from here

http://www.st.com/web/catalog/tools/FM147/CL1794/SC961/SS1743/LN1734/PF258157

. When I'm executing, at startup the driver gets a SUSP, RESET and ESOF interrupt causing it to first reset then suspend and it stay indefinitly suspended. When debugging I noticed that in the PowerOn method executed at startup (just before interruption control register setting) the instruction 

_SetISTR(0);

does not write the entire register to zero. So three questions: 1: Is it possible that my observation comes from the time needed by the debugger to read the register, a single step on the instruction, causing new interrupts to occures ? 2: If no, does my problem could come from here ? 3: Anybody got this mass storage exemple working ? Thank you in advance for your help.
    This topic has been closed for replies.

    4 replies

    chandu1
    chandu1
    Associate II
    January 20, 2015
    Posted on January 20, 2015 at 04:48

    Hi franciulla.geoffrey,

    I'm trying to work on the STM32F103 USB, I already read that data sheet and searching for the example code can you please provide that code for me.

    Thanks & Regards,

    Chandu.Kurapati.

    Tesla DeLorean
    Tesla DeLorean
    Guru
    January 20, 2015
    Posted on January 20, 2015 at 17:48

    ...searching for the example code can you please provide that code for me.

    He cited a specific library with examples, download THAT. Review also the firmware libraries for the EVAL series boards, and the examples therein.
    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    geoffrey
    geoffreyAuthor
    Associate
    January 20, 2015
    Posted on January 20, 2015 at 20:29

    Click on my link and go to the bottom of the page, you'll see a download button. Once you downloaded the file you'll find everything you need in it. Thanks to MCD Application Team.

    geoffrey
    geoffreyAuthor
    Associate
    January 22, 2015
    Posted on January 22, 2015 at 20:36

    So nobody with a little bit of experience in USB on cortex (or not) can give a piece of advice how to understand why my device enters in suspended mode right after startup reset ?

    It will be really appreaciated because its drives me crazy !!

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