DISCOVERY F4 code size limit ???

[jeremie]

Posted on July 19, 2015 at 02:39

Hi,

I am using a DISCOF4 with the USB library with great success if the code size is bellow 17356 bytes. More than 17352 bytes and the USB library is crashing (unknown device in the device manager)! Is there something I am missing? I don't know what to do...

Thank you in advance for your help

Info taken from the .map file :

Everything is working :

==============================================================================

      Code (inc. data)   RO Data    RW Data    ZI Data      Debug   

     17352        918        472        472      50576     485554   Grand Totals

     17352        918        472        208      50576     485554   ELF Image Totals (compressed)

     17352        918        472        208          0          0   ROM Totals

==============================================================================

    Total RO  Size (Code + RO Data)                17824 (  17.41kB)

    Total RW  Size (RW Data + ZI Data)             51048 (  49.85kB)

    Total ROM Size (Code + RO Data + RW Data)      18032 (  17.61kB)

==============================================================================

USB is not working :

==============================================================================

      Code (inc. data)   RO Data    RW Data    ZI Data      Debug   

     17356        918        472        472      50576     485558   Grand Totals

     17356        918        472        208      50576     485558   ELF Image Totals (compressed)

     17356        918        472        208          0          0   ROM Totals

==============================================================================

    Total RO  Size (Code + RO Data)                17828 (  17.41kB)

    Total RW  Size (RW Data + ZI Data)             51048 (  49.85kB)

    Total ROM Size (Code + RO Data + RW Data)      18036 (  17.61kB)

==============================================================================

#stm32 #device #discovery #usb

[Tesla DeLorean]

Posted on July 19, 2015 at 14:28

The part has 1MB of FLASH.

The issue here is something in the code you're running, that's creating a dependency. You should probably make sure you've allocated sufficient space for the stack, and check that you don't call out any specific addresses.

The stack would be in startup_stm32f4xx.s, probably something like 0x400, try 0x2000