HI I'm using stm32f103zd and iwm getting after some hours hard fault How can I detect the reason and solve the problem?

[Tesla DeLorean]

Start by having a proper Hard Fault handler so you can identify the code that is faulting, and the register/stack content.

Make sure you have a sufficiently large stack, and you understand how much of it is being used.

[mmell]

HI THANK YOU I'M DOUBLE THE STACK AND IT DID NOT PREVENT FROM HAPPENING -i using the iar workbench so I TRIED TO CATCH WITH IAR

Can you suggest to me what function to write in hard fault?

[mmell]

and it seemed to happen when I'm using the printf or STRCAT function-I not sure

[Tesla DeLorean]

For strings make sure you understand the lengths, and that there is NUL termination.

In Keil we do this, changing startup_stm32xxxx.s to have calling code

HardFault_Handler\
                PROC
                EXPORT  HardFault_Handler
 
                ; Determine correct stack
 
                TST     lr, #4
                ITE     EQ
                MRSEQ   R0, MSP         ; Read MSP (Main)
                MRSNE   R0, PSP         ; Read PSP (Process)
 
                MOV     R1, R4
                MOV     R2, R5
                MOV     R3, R6
 
                EXTERN  hard_fault_handler_c
                B       hard_fault_handler_c
                ENDP

//****************************************************************************
 
void hard_fault_handler_c(unsigned int * hardfault_args, unsigned int r4, unsigned int r5, unsigned int r6)
{
  printf ("\n[Hard Fault]\n"); // After Joseph Yiu
 
  printf ("r0 = %08X, r1 = %08X, r2 = %08X, r3 = %08X\n",
    hardfault_args[0], hardfault_args[1], hardfault_args[2], hardfault_args[3]);
  printf ("r4 = %08X, r5 = %08X, r6 = %08X, sp = %08X\n",
    r4, r5, r6, (unsigned int)&hardfault_args[8]);
  printf ("r12= %08X, lr = %08X, pc = %08X, psr= %08X\n",
    hardfault_args[4], hardfault_args[5], hardfault_args[6], hardfault_args[7]);
 
  printf ("bfar=%08X, cfsr=%08X, hfsr=%08X, dfsr=%08X, afsr=%08X\n",
    *((volatile unsigned int *)(0xE000ED38)),
    *((volatile unsigned int *)(0xE000ED28)),
    *((volatile unsigned int *)(0xE000ED2C)),
    *((volatile unsigned int *)(0xE000ED30)),
    *((volatile unsigned int *)(0xE000ED3C)) );
 
  while(1);
}
 
//****************************************************************************

[mmell]

Thank you ,Is there something that is concern on stm32f103zd ?

[Tesla DeLorean]

The causes a fairly constrained, and not specific to the STM32F103ZD

Make sure you don't have any errant pointers, or overflow buffers or local variables. Add sanity checking on pointer.

[mmell]

Thank for answering me on sunday-What register suppose to show me the problems?

[Tesla DeLorean]

You're going to be interested in the PC, the instructions there and immediately before and the registers those instructions are acting upon. They will provide the context of the failure/fault.