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write/read float value to flash

hamed ad

I try to write float values to flash memory of STM32F103RBT6.
but it cannot read the value and CPU reset by IWDT. my code is in below:

char str[100];
float Val;
float Data;
Data=123.456;

FLASH_Unlock();
FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
FLASH_ErasePage(0x08002000);
//write------------------------
        Val = *((unsigned long*)&Data);
        FLASH_ProgramWord(0x08002000,Val);
//Read-----------------------------
float *mem = (float *)0x08002000;
sprintf(str,"%f\n", *mem);
uart_out_str(str);


How ever the following code wires and reads integer values

u32 Data;
Data=123;
FLASH_Unlock();
FLASH_ClearFlag(FLASH_FLAG_BSY | FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
FLASH_ErasePage(0x08002000);
//write------------------------
FLASH_ProgramWord(0x08002000, Data);
//Read-----------------------------
u32 *mem = (u32 *)0x08002000;
sprintf(str,"%u\n", *mem);uart_out_str(str);

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