* @file    stm32f2xx_flash.c
  * @version V1.0.0
  * @date    18-April-2011

    /* if the previous operation is completed, proceed to program the new data */
    FLASH->CR &= CR_PSIZE_MASK;
    FLASH->CR |= FLASH_PSIZE_BYTE;
    FLASH->CR |= FLASH_CR_PG;
  
    *(__IO uint8_t*)Address = Data;
        
    /* Wait for last operation to be completed */
    status = FLASH_WaitForLastOperation();

#define PAGE_SZ ( (uint32_t)0x4000 ) // Размер секторов 0..3 равен 16 кБ
#define CONST0_START ( (uint32_t)0x08004000 ) // start address from sector1
#define CONST0_ID FLASH_Sector_1
#define CONST1_START ( CONST0_START + PAGE_SZ ) // start address from sector2
#define CONST1_ID FLASH_Sector_2
#define VOLTAGE_RANGE (uint8_t)VoltageRange_3 // Device voltage range supposed to be [2.7V to 3.6V], the operation will be done by word


/* --- wr_sector() ---------------------------------------------------------------------------------------- **
* Запись сектора
* adr - адрес во флэш, куда писать
* dat - адрес от куда писать
* len - размер данных в байтах
* -------------------------------------------------------------------------------------------------------- */
static FLASH_Status wr_sector( uint32_t adr, uint32_t *dat, int len )
{
FLASH_Status fs;

for ( fs = FLASH_COMPLETE; len; len -= sizeof( uint32_t ), adr += sizeof( uint32_t ), dat++ )
if (( fs = FLASH_ProgramWord( adr, *dat )) != FLASH_COMPLETE )
break;
return( fs );
}

/* --- wr_const() ----------------------------------------------------------------------------------------- **
* Запись констант в копию number (0 или 1 )
* -------------------------------------------------------------------------------------------------------- */
static FLASH_Status wr_const( int number )
{
uint32_t id, adr;
FLASH_Status fs;

id = CONST0_ID;
adr = CONST0_START;
if ( !number )
{ id = CONST1_ID;
adr = CONST1_START;
}
FLASH_Unlock();
if (( fs = FLASH_EraseSector( id, VOLTAGE_RANGE )) == FLASH_COMPLETE )
fs = wr_sector( adr, (uint32_t *)&r_const, sizeof( ATM_Constant ));
FLASH_Lock();
return( fs );
}

  if ( !number )

  if ( number )

INT8 FlashWriteBlock(UINT32 WriteAddr, UINT8 * pBuffer, UINT32 byteCnt)
{
....
  // Disable interrupts to prevent flash programming errors from firing
  __disable_interrupt();
  FLASH_Unlock();
  UINT32 FlashEnd = FlashGetEndAddr();
  for (UINT32 WriteCount = 0;(WriteCount < byteCnt) && (WriteAddr < FlashEnd); WriteCount += 4)
  {
    // Clear pending flags incase they were triggered
    FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
                    FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);
    /* Program the data received into STM32F10x Flash */
    FLASH_ProgramWord(WriteAddr, *(UINT32*)pBuffer);
    if (*(uint32_t*)WriteAddr != *(uint32_t*)pBuffer)
    {
      FLASH_Lock();
      __enable_interrupt();
      return -2;
    }
    WriteAddr += 4;
    pBuffer += 4;
  }
  FLASH_Lock();
  __enable_interrupt();
  return 0;
}