Writing to flash bricks stm32G030 and stm32G031

[PGood.1]

If I create a program using stmcubeIDE and ADD the code below it bricks the processor . I gather in some way I am overwritting the bootloader that controls stlink and get the error

Target no device found

Error in initializing ST-LINK device.

Reason: No device found on target

Error in final launch sequence:

Failed to execute MI command:

target remote localhost:61234

Error message from debugger back end:

localhost:61234: Connection timed out.

Failed to execute MI command:

target remote localhost:61234

Error message from debugger back end:

localhost:61234: Connection timed out.

localhost:61234: Connection timed out.

 /* USER CODE BEGIN 2 */

 uint32_t address=0x8005800;

 uint64_t data=0x0807060504030201DU;

 HAL_FLASH_Unlock(); // Unlock the flash memory for write access

 // Erase the page that contains the specified address

 FLASH_EraseInitTypeDef erase_init;

 erase_init.TypeErase = FLASH_TYPEERASE_PAGES;

 erase_init.Page = address & ~(FLASH_PAGE_SIZE - 1); // Round down to page boundary

 erase_init.NbPages = 1;

 uint32_t page_error;

 HAL_FLASHEx_Erase(&erase_init, &page_error);

 // Write the data to the specified address this is a 64bit number

 HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data);

 HAL_FLASH_Lock();

 /* USER CODE END 2 */

[Tesla DeLorean]

Perhaps check error codes?

This is WRONG

erase_init.Page = address & ~(FLASH_PAGE_SIZE - 1); // Round down to page boundary

[PGood.1]

Further it now get what looks like a stack overflow

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

No source available for "<signal handler called>() at 0xfffffff1" 

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

No source available for "<signal handler called>() at 0xfffffff9" 

    status = FLASH_WaitForLastOperation(FLASH_TIMEOUT_VALUE); Line 197 in stm32g0xx_hal_flash_ex.c

this is called by

 if (HAL_FLASHEx_Erase(&erase_init, &PAGEError) != HAL_OK)

 {

  /*Error occurred while page erase.*/

 return HAL_FLASH_GetError();

 }

the compete code is which is added to a fresh project created by codeMX

 /* USER CODE BEGIN 2 */

 uint32_t address=0x08005800;

 uint64_t data=0x08070605040302010;

 HAL_FLASH_Unlock(); // Unlock the flash memory for write access

 // Erase the page that contains the specified address

 FLASH_EraseInitTypeDef erase_init;

 for (int indx=0; indx<128; indx++)

 {

 if((address < (0x08000000 + (FLASH_PAGE_SIZE *(indx+1))) ) && (address >= (0x08000000 + FLASH_PAGE_SIZE*indx)))

 {

 erase_init.Page=0x08000000 + FLASH_PAGE_SIZE*indx;

 }

 }

 erase_init.TypeErase = FLASH_TYPEERASE_PAGES;

 //erase_init.Page = address & ~(FLASH_PAGE_SIZE - 1); // Round down to page boundary

 erase_init.Banks=FLASH_BANK_1;

 erase_init.NbPages = 1;

 uint32_t PAGEError;

 if (HAL_FLASHEx_Erase(&erase_init, &PAGEError) != HAL_OK)

 {

  /*Error occurred while page erase.*/

 return HAL_FLASH_GetError();

 }

 // Write the data to the specified address this is a 64bit number

 HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data);

 HAL_FLASH_Lock();

 //uint64_t dataout= *(__IO float *)address;

 /* USER CODE END 2 */

[Tesla DeLorean]

Page isn't an address

Surely

erase_init.Page = address / FLASH_PAGE_SIZE;​