HardFault when transfer control from BL to APP

[Grogu]

Hi,

Device - STM32H7B3I-DK

Project - STM32H7B3I-DK\Applications\2_Images_ExtFlash

HardFault when transfer control from BL to APP

1) Last trace of code

launch_application:
/******************************************************
* return from exception to application launch function
* R0: application vector address
* R1: exit function address
* push interrupt context R0 R1 R2 R3 R12 LR PC xPSR
*******************************************************/
        MOV R2, #0x01000000 /* xPSR activate Thumb bit */
        PUSH {R2}
        MOV R2, #1
        BIC R1, R1, R2      /* clear least significant bit of exit function */
        PUSH {R1}           /* return address = application entry point */
        MOV R1, #0          /* clear other context registers */
        PUSH {R1}
        PUSH {R1}
        PUSH {R1}
        PUSH {R1}
        PUSH {R1}
        PUSH {R0}           /* R0 = application entry point */
        MOV LR, #0xFFFFFFF9 /* set LR to return to thread mode with main stack */
        BX LR               /* return from interrupt */
.end

Value of LR,SP

 

Memory of stack pointer :  

2) LR : 0xFFFF.FFF9 return from Handler mode so NVIC does unstacks PC, R0-R3, R12, LR, xPSR

PC : 0x8020400 looks correct for APP launch

3) Application memory at 0x8020400

Which also looks about right.

Any help debugging this HardFault would be appreciated.

Thanks in Advance.

[Grogu · Accepted solution]

My bad the bootloader is actually making a jump to the application. UART configuration of application(Sample application) is corrupted somehow when it transfers control and its not printing the data.

Closing the ticket