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stm32hal

How do I find out the size of the flash memory in the code itself?

I want to get the limiting address of the flash in the code itself, or at least the size of this flash.

I found only the start address of the flash in the stm32f302xc.h file, but did not find the end address.

/** @addtogroup Peripheral_memory_map
  * @{
  */

#define FLASH_BASE            0x08000000UL /*!< FLASH base address in the alias region */
#define SRAM_BASE             0x20000000UL /*!< SRAM base address in the alias region */
#define PERIPH_BASE           0x40000000UL /*!< Peripheral base address in the alias region */
#define SRAM_BB_BASE          0x22000000UL /*!< SRAM base address in the bit-band region */
#define PERIPH_BB_BASE        0x42000000UL /*!< Peripheral base address in the bit-band region */

What defines are responsible for this, thanks.

Solution

  • What you want is described in the reference manual RM0366 in section 29.2 Memory size data register.

    ST provide this functionaility but for some reason they don't always give an easy way to access it in the headers.

    The address of this register is FLASHSIZE_BASE. You have to read it at run-time, eg:

    uint16_t flash_size_kb = *(const uint16_t*)FLASHSIZE_BASE;