bank swapping in stm32h745

[ykn]

Hi,

I want to use OTA in stm32h743, for that I need to switch between two bank after flash write, as per reference manual

//HAL_FLASH_OB_Lock();
	HAL_FLASH_OB_Unlock();
 
	/* Set OPTSTRT Bit */
	SET_BIT(FLASH->OPTSR_PRG, FLASH_OPTCR_SWAP_BANK);
	/* Wait for OB change operation to be completed */
	status = FLASH_OB_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
 
 
	/* Set OPTSTRT Bit */
	SET_BIT(FLASH->OPTCR, FLASH_OPTCR_OPTSTART);
	/* Wait for OB change operation to be completed */
	status = FLASH_OB_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
	if(READ_BIT(FLASH->OPTSR_CUR, FLASH_OPTCR_SWAP_BANK) != 0U)
		{
			UARTSendString(RS232_PORT, (unsigned char*)"Bit Set \r\n\r\n");
		}
	//__disable_irq();
	HAL_NVIC_SystemReset();

i wrote some code

HAL_StatusTypeDef HAL_FLASH_OB_Unlock(void)
{
  if(READ_BIT(FLASH->OPTCR, FLASH_OPTCR_OPTLOCK) != 0U)
  {
    /* Authorizes the Option Byte registers programming */
    WRITE_REG(FLASH->OPTKEYR, FLASH_OPT_KEY1);
    WRITE_REG(FLASH->OPTKEYR, FLASH_OPT_KEY2);
 
    /* Verify that the Option Bytes are unlocked */
    if (READ_BIT(FLASH->OPTCR, FLASH_OPTCR_OPTLOCK) != 0U)
    {
      return HAL_ERROR;
    }
  }
 
  return HAL_OK;
}

but it is not working please guide me for this

[Imen.D]

Hello @ykn​ ,

I recommend you this article that will help you on how to configure swap bank based on an STM32H7 example:

• How to configure swap bank on STM32H7 P1
• How to configure swap bank on STM32H7 P2

Hope this helped you.

Imen

[ykn]

I have almost done the above thing, Now I got the error

Break at address "0x812bb84" with no debug information available, or outside of program code.

currently working on bank 1 and want switch to bank 2. One addition thing i have added is

HAL_NVIC_SystemReset();

this functin , the manual implied that you need to reset the sysytem.

Thankinh you

[ykn]

I came to know that, the break point address is hardfault

void HardFault_Handler(void)
{
 8100a26:	b480      	push	{r7}
 8100a28:	af00      	add	r7, sp, #0
  /* USER CODE BEGIN HardFault_IRQn 0 */
 
  /* USER CODE END HardFault_IRQn 0 */
  while (1)
 8100a2a:	e7fe      	b.n	8100a2a <HardFault_Handler+0x4>

why should I get hardfault.

Checklist

1. linker script change

MEMORY
{
  FLASH (rx)     : ORIGIN = 0x08100000, LENGTH = 1024K
  DTCMRAM (xrw)  : ORIGIN = 0x20000000, LENGTH = 128K
  RAM_D1 (xrw)   : ORIGIN = 0x24000000, LENGTH = 512K
  RAM_D2 (xrw)   : ORIGIN = 0x30000000, LENGTH = 288K
  RAM_D3 (xrw)   : ORIGIN = 0x38000000, LENGTH = 64K
  ITCMRAM (xrw)  : ORIGIN = 0x00000000, LENGTH = 64K
}

• Vector tab address changed

#if defined(USER_VECT_TAB_ADDRESS)
#if defined(DUAL_CORE) && defined(CORE_CM4)
/*!< Uncomment the following line if you need to relocate your vector Table
     in D2 AXI SRAM else user remap will be done in FLASH BANK2. */
/* #define VECT_TAB_SRAM */
/*#if defined(VECT_TAB_SRAM)*/
#define VECT_TAB_BASE_ADDRESS   D2_AXISRAM_BASE   /*!< Vector Table base address field.
                                                       This value must be a multiple of 0x200. */
#define VECT_TAB_OFFSET         0x00000000U       /*!< Vector Table base offset field.
                                                       This value must be a multiple of 0x200. */
#else
#define VECT_TAB_BASE_ADDRESS   FLASH_BANK2_BASE  /*!< Vector Table base address field.
                                                       This value must be a multiple of 0x200. */
#define VECT_TAB_OFFSET         0x00100000U       /*!< Vector Table base offset field.
                                                       This value must be a multiple of 0x200. */
#endif /* VECT_TAB_SRAM */
#else
/*!< Uncomment the following line if you need to relocate your vector Table
     in D1 AXI SRAM else user remap will be done in FLASH BANK1. */
/* #define VECT_TAB_SRAM */
#if defined(VECT_TAB_SRAM)
#define VECT_TAB_BASE_ADDRESS   D1_AXISRAM_BASE   /*!< Vector Table base address field.
                                                       This value must be a multiple of 0x200. */
#define VECT_TAB_OFFSET         0x00000000U       /*!< Vector Table base offset field.
                                                       This value must be a multiple of 0x200. */
#else
#define VECT_TAB_BASE_ADDRESS   FLASH_BANK1_BASE  /*!< Vector Table base address field.
                                                       This value must be a multiple of 0x200. */
#define VECT_TAB_OFFSET         0x00000000U       /*!< Vector Table base offset field.
                                                       This value must be a multiple of 0x200. */
#endif /* VECT_TAB_SRAM */
#endif /* DUAL_CORE && CORE_CM4 */

• land last

#define FLASH_BANK1_BASE          (0x08000000UL) /*!< Base address of : (up to 1 MB) Flash Bank1 accessible over AXI                          */
#define FLASH_BANK2_BASE          (0x08100000UL) /*!< Base address of : (up to 1 MB) Flash Bank2 accessible over AXI                          */
#define FLASH_END                 (0x081FFFFFUL) /*!< FLASH end address                                                                       */
 
/* Legacy define */
#define FLASH_BASE                FLASH_BANK2_BASE

Please some one guide where i am wrong.

I have done the same task using custom bootloader and that worked fine. buth same the thing i tried with bank swapping i got hardfault error.:expressionless_face: