How to move vector table to RAM in stm32f1 devices

[Javier1]

To reduce latency time of interruptions.

Based on the same thing but in stm32f0 devices

[Javier1 · Accepted solution]

In main.c

/* USER CODE BEGIN PD */
     #define VECTOR_TABLE_SIZE (67 + 1 + 13 +9)//67 positive vectors, 0 vector, and 13 negative vectors (and extra 9 i dont know why)
/* USER CODE END PD */

/* USER CODE BEGIN PV */
volatile uint32_t __attribute__((section(".ram_vector,\"aw\",%nobits @"))) ram_vector[VECTOR_TABLE_SIZE];
extern volatile uint32_t g_pfnVectors[VECTOR_TABLE_SIZE];
/* USER CODE END PV */

/* USER CODE BEGIN 1 */
    RCC->CR |= RCC_HSI_ON;  // early enable to ensure clock is up and running when it comes to usage
    for (uint32_t i = 0; i < VECTOR_TABLE_SIZE; i++) {//copy vector table
      ram_vector[i] = g_pfnVectors[i];
    }
  /* USER CODE END 1 */

In system_stm32f1xx.c, uncomment the #define USER_VECT_TAB_ADDRESS

and #define VECT_TAB_SRAM

#define USER_VECT_TAB_ADDRESS */
 
#if defined(USER_VECT_TAB_ADDRESS)
/*!< Uncomment the following line if you need to relocate your vector Table
     in Sram else user remap will be done in Flash. */
 #define VECT_TAB_SRAM
#if defined(VECT_TAB_SRAM)
#define VECT_TAB_BASE_ADDRESS   SRAM_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_BASE      /*!< Vector Table base address field.
                                                     This value must be a multiple of 0x200. */
#define VECT_TAB_OFFSET         0x08004800     /*!< Vector Table base offset field.
                                                     This value must be a multiple of 0x200. */
#endif /* VECT_TAB_SRAM */
#endif /* USER_VECT_TAB_ADDRESS */

In the linker script (.ld)

.fini_array :
  {
    . = ALIGN(4);
    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT(.fini_array.*)))
    KEEP (*(.fini_array*))
    PROVIDE_HIDDEN (__fini_array_end = .);
    . = ALIGN(4);
  } >FLASH
 
/*javi*/
/*https://community.st.com/s/question/0D53W00000trgpiSAA/how-to-boot-to-random-address-without-vecttaboffset-stm32f072*/
  /* redirected vector must go to top of the RAM  */
  .ram_vector :
  {
    *(.ram_vector)
  } >RAM
/*javi*/