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I've a problem on the STM32F412 with flash writing and USB Host initialized. When USB Host is active and I attempt to write to flash, the software execution blocking at FLASH_FlushCaches function, on the line:

if (READ_BIT(FLASH->ACR, FLASH_ACR_ICEN) != RESET)

If I remove the MX_USB_HOST_Init function, the flash writing works fine, but if I call the function in any position on the code (even after flash writing calls), the code always stop at the same point.

I don't have ideas about this problem. Do you have any suggestions? Thanks!

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    \$\begingroup\$ Are you sure the flash is readable for code while you write it? When USB interrupt comes in, it must be possible to run it or it will fail. \$\endgroup\$
    – Justme
    Commented May 9 at 14:02
  • \$\begingroup\$ Sorry, I didn't quite understand what you meant... Are you talking about the OTG_FS_IRQHandler interrupt? \$\endgroup\$
    – Stefano
    Commented May 9 at 15:15
  • \$\begingroup\$ @Justme: The solution to that would be to (a) put all ISRs into a separate section (make sure to compile with -fPIC so they are relocatable), (b) create a shadow copy of ISR code in RAM, (c) update the interrupt vector table to point to the RAM copy. I think there's a way in the linker config to tell it a certain section will execute from a different address than where the linker stores it; that way relocatable code is not needed and the correct addresses would be in the interrupt table already. \$\endgroup\$
    – Ben Voigt
    Commented May 9 at 15:55
  • \$\begingroup\$ I solved it; it was enough to update the libraries. Indeed, I was working on a project created a few years ago for another STM microcontroller. \$\endgroup\$
    – Stefano
    Commented Jul 11 at 12:49

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