Read values of UICR in Application

[Simon_89]

Hi, 

I am trying to read the value of the UICR register CUSTOMER[4] during the runtime of the application. Therefore, I am using the following code:

nrf_fstorage_read(&m_fs, (0x10001090), &destination, 32);

Where m_fs is the storage instance and destination is initialized as a char array.

My two questions are: 

- Is it correct to use nrf_fstorage_read for this purpose?

- Which address do I need to use, as my call is returning error 16: NRF_ERROR_INVALID_ADDR

Thanks, 

Simon

[Einar Thorsrud]

Hi,

You cannot use fstorage in this case. To read data from the UICR (or any other fixed address in flash for that matter), just read it directly. Example:

uint32_t reg_val = *(volatile uint32_t *) 0x10001090;

Here, the content of CUSTOMER[4] will be copied to the variable reg_val. You could also make a pointer and use that. For example, like this:

volatile uint32_t * p_my_uicr_reg = (volatile uint32_t *) 0x10001090;
NRF_LOG_INFO("Val: %08X", *p_my_uicr_reg);

[Simon_89]

Hi Einar

Thank you very much for the perfect answer, that solved the issue!

Could that be integrated into the official documentation? This one is only referring to writing, but I could not find anything referring to reading...

Thanks, 

Simon