How can I read bytes from flash?

[Rifat Mahmud]

developer.nordicsemi.com/.../a00935.html

The doc seems to provide only write functions. And, the flashwrite example doesn't show how to read from flash even after device rebooted. How can I read something later that has been stored in flash?

[Susheel Nuguru]

You do not need NVMC hardware or API to read the flash memory. Just read it like any other memory.

for example, if you want to read 2 bytes of flash located at 0x21000 then the below code will do it

#define STORAGE_ADR   0x21000
uint16_t value = *(uint16_t *)ptr;

or If you want to compare it with some thing then better would be to do like below

  if(*((uint16_t *)STORAGE_ADR) == 0xff)
  {
    do something;
  } 

[Rifat Mahmud]

But, since it's 'non volatile' memory, will this address be working even after complete hard reboot of the device?

[Susheel Nuguru]

I do not see why not!! The flash is initialized before the CPU starts executing code. So it should work, give it a try and let me know how it went.

[Rifat Mahmud]

Yes, the flash is working on restart. Thanks. :)

[Susheel Nuguru]

Thanks for coming back and updating this thread.