NVM usage in nrf51422

[Mohamed O.Abouzeid]

I'm currently want to use the NVM with ble device, when I tried to send values from the mobile app to be stored to the NVM, it doesn't work, I guessed that the problem that it didn't recieve the data but it's not that , the problem appear when I use the nvm memory functions, I don't know the reason for that & how to overcome this problem.

[Mohamed O.Abouzeid]

           void edit_speed_ID(uint8_t speed)
           {		
       //pattern_ID_3();
        uint32_t value, err_code;
       value=0x00000000 | speed;
         err_code=sd_flash_write(address,(uint32_t *) & value,1);
       APP_ERROR_CHECK(err_code);
           flag=false;
           //	flash_init();
            }

in the main function

	if (flag==false)
	{
	speed = * address;
	//speed = 5 *speed;
	}

and flag is global identifier.

[Petter Myhre]

Could you edit your question and include this? Try to use answers for answers. You should also try elaborate on what "I can't read the data written again" means.