can any one tell me why its only showing 23 in memory address and rest of its not showing 24,25,25

[SDhka.1]

* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/

#include "main.h"

#include "stm32l5xx_hal.h"

#define FLASH_SECTOR2_BASE_ADDRESS 0x08040000

/* Private includes ----------------------------------------------------------*/

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/

/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/

/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

uint32_t addressflash =0x08040000;

//uint8_t Data=0x24;

uint32_t Banks =FLASH_BANK_2;

uint8_t Data[4]={0x23,0x24,0x25,0x25};

uint8_t i;

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**

 * @brief The application entry point.

 * @retval int

 */

int main(void){

 /* USER CODE BEGIN 1 */

 /* USER CODE END 1 */

 /* MCU Configuration--------------------------------------------------------*/

 /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

 HAL_Init();

 /* USER CODE BEGIN Init */

 /* USER CODE END Init */

 /* Configure the system clock */

 SystemClock_Config();

 /* USER CODE BEGIN SysInit */

 /* USER CODE END SysInit */

 /* Initialize all configured peripherals */

 MX_GPIO_Init();

 /* USER CODE BEGIN 2 */

// HAL_FLASH_Unlock();

// FLASH_PageErase(addressflash,Banks);

//

// HAL_FLASH_Lock();

  HAL_FLASH_Unlock();

for(i=0;i<=3;i++)

  HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD,addressflash,Data[i]);

addressflash++;

HAL_FLASH_Lock();

 /* USER CODE END 2 */

[Bubbles]

Hi @SDhka.1​,

you are calling doubleword programming method. The data parameter must be 64bit, but in one go, not in loop by 8 bits. Look at the FLASH_EraseProgram example from intoduction package repository to see how you can pass whole 64 in single call.

BR,

J

[Tesla DeLorean]

64-bit double words will require you advance the address variable by 8-bytes, not 1

The width of the FLASH line is 64-bit, you get a single shot to write it.

You could cast a 64-bit data pointer to you Data array, but you'd end up writing those 4 bytes, followed by 4 bytes beyond that in memory.

[Tesla DeLorean]

You'd want to use a compound statement

for(i=0;i<=3;i++)
{
   HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD,addressflash,Data[i]);
  addressflash += 8; // 64-bit advanced, and aligned address
}

Or

HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD,addressflash, *((uint64_t *)Data) );

[SDhka.1]

But i want read write erase again and again . in the above program its not happing. He Tesla DeLorean can you help me in this program... how did i do read write erase again and again. , what should i do change in my code.

[Tesla DeLorean]

STM32Cube_FW_L5_V1.2.0\Projects\NUCLEO-L552ZE-Q\Examples\FLASH\FLASH_EraseProgram

Perhaps something materially similar to this, which erases and writes a block of data

https://community.st.com/s/question/0D53W00002Bfv6BSAR/writing-to-internal-flash-stm32l422kbt6

Constantly erasing and writing a small amount of content is not recommended. Might want to look at journalling the write across the entire page before erasing.

Perhaps having a checksum/crc on critical data, and the ability to pick usable default values in the initial case, or when data is corrupt / unreadable.

[Bubbles]

If you want to rewrite the value frequently, you should really use something like this: X-CUBE-EEPROM - EEPROM emulation expansion software for STM32Cube - STMicroelectronics

Otherwise you'll soon burn a hole in the flash word that you'll keep rewriting.