STM32F746 Flash Sector Erase Problem

[BahadirA]

Hi Guys,

I have a problem with erasing Flash sector. I am using STM32F746ZG Nucleo Board. When  I run this code, mcu works perfect it works but I can't install new firmware to mcu. I've also tried example code, same problem. I take (DEV_TARGET_NOT_HALTED) when I run the program.

I am getting the same error in debug mode as described in the link below.

https://community.st.com/t5/stm32cubeide-mcus/how-to-solve-error-finishing-flash-operation-in-stm32cubeide/td-p/53113/page/2

Code Here they are

FLASH_EraseInitTypeDef FLASH_Erase_Init;
uint32_t SectorError;

HAL_FLASH_Unlock();

FLASH_Erase_Init.TypeErase = FLASH_TYPEERASE_SECTORS;
FLASH_Erase_Init.VoltageRange = FLASH_VOLTAGE_RANGE_3;
FLASH_Erase_Init.Sector. FLASH_SECTOR_3;
FLASH_Erase_Init.NbSectors = 1;

if(HAL_FLASHEx_Erase(&FLASH_Erase_Init, &SectorError) == HAL_OK)
HAL_Flash_Lock();

How can i solve it ?

[STea]

Hello @BahadirA ,

Please refer to the reference manual RM0385 / Table 3. STM32F756xx and STM32F74xxx Flash memory organization of how the sectors are organized.

For erase_init.Sector and erase_init.NbSectors parameters, I propose to follow this example. These two parameters are provided by GetSector().

  FirstSector = GetSector(FLASH_USER_START_ADDR);
  /* Get the number of sector to erase from 1st sector*/
  NbOfSectors = GetSector(FLASH_USER_END_ADDR) - FirstSector + 1;
  /* Fill EraseInit structure*/
  EraseInitStruct.TypeErase     = FLASH_TYPEERASE_SECTORS;
  EraseInitStruct.VoltageRange  = FLASH_VOLTAGE_RANGE_3;
  EraseInitStruct.Sector        = FirstSector;
  EraseInitStruct.NbSectors     = NbOfSectors;

PS: you can also to refer to AN4657 "STM32 in-application programming (IAP) using the USART" for a customized bootloader via UART.

Regards.

[BahadirA · Accepted solution]

I've solved this issue with changing Reset Behaviour from Connect under reset to None.