STM32H7 USB DFU firmware boodloader bug

[JosepM Ribera]

Hi,

 

We are using STM32H7, and we found that the following instruction doesn't work:

 

/* Test if user code is programmed starting from address 0x08020000 */
if (((*(__IO uint32_t *) USBD_DFU_APP_DEFAULT_ADD) & 0x2FFC0000) == 0x20000000) <--- It is always FALSE. Despite there is user code!
{
 /* Jump to user application */
 JumpAddress = *(__IO uint32_t *) (USBD_DFU_APP_DEFAULT_ADD + 4);
 JumpToApplication = (pFunction) JumpAddress;
 
 /* Initialize user application's Stack Pointer */
 __set_MSP(*(__IO uint32_t *) USBD_DFU_APP_DEFAULT_ADD);
 JumpToApplication();
}

 We've tried with the mask: & 0x2FFC0000 and & 0x2FFE0000

What could be the issue? Another mask is needed for stm32H7?

Thank you

 

BR

[TDK]

Known issue as of two years ago.

https://community.st.com/t5/stm32cubemx-mcus/usb-dfu-example-bug-stm32h7/td-p/182234

 

[JosepM Ribera]

So.. for now, what can we do? Any solution?? :frowning_face:

[TDK]

Edit the file to correct it, presumably the value should be 0x24100000 but I didn't dig into it.

[Pavel A.]

/* Test if user code is programmed starting from address 0x08020000 */

 Example of why no comments is better than deceiving comments.