I have a function that was implemented for STM32F4 discovery board and needs to be migrated to STM32L4R9I.

static void hal_flash_bank_stm32_write(void * context, int bank, uint32_t offset, const uint8_t * data, uint32_t size)
{
    hal_flash_bank_stm32_t * self = (hal_flash_bank_stm32_t *) context;

    if (bank > 1) return;
    if (offset > self->sector_size) return;
    if ((offset + size) > self->sector_size) return;

    unsigned int i;
    HAL_FLASH_Unlock();
    for (i = 0; i < size; i++)
    {
            HAL_FLASH_Program(FLASH_TYPEPROGRAM_BYTE, self->banks[bank] + offset + i, data[i]);
    }
    HAL_FLASH_Lock();
}

The STM32L4R9I does not provide FLASH_TYPEPROGRAM_BYTE but rather FLASH_TYPEPROGRAM_DOUBLEWORD. I am struggling with how to write all bytes properly. I tried the following:

uint64_t dword = 0;
for (i = 0; i < size; i++)
{
    dword = (dword << 8) | data[i];
    if (i > 0 && i % 8 == 0)
    {
        uint32_t addr = self->banks[bank] + offset + i;
        HAL_FLASH_PROGRAM(FLASH_TYPEPROGRAM_DOUBLEWORD, addr, dword);
        dword = 0;
    }
}

I am currently unable to test my logic on a board. Is my logic correct or am I missing something?