UICR register CUSTOMER [0] Read / write

[yokokawa]

OS in development environment ：Windows7
HARD :(Taiyo Yuden)EBSHSN Series Evaluation Board : Central / Peripherals
CPU :(Nordic) nRF52832 / ARMR Cortex-M4F 32 bit processor 28-pin Land Grid Array / 15GPIOs / SWD
Soft Ver:nRF5_SDK_15.2.0_9412b96

Running the following program will not cause an error, but the value will not change.

1)The register display of the debugger is “0xffffffff”, but “0x00000000” is read.
----------<　Data Read　>--------------------------------------------------
static uint8_t Read_DeviceName[5];

Read_DeviceName[0] = NRF_UICR -> CUSTOMER[0]

2)Regisla display is “0xffffffff” even if “0x00000000” is written.
----------<　Data Write >--------------------------------------------------
static uint8_t Read_DeviceName[5];

Read_DeviceName[0] = 0;
NRF_UICR -> CUSTOMER[0] = Read_DeviceName[0];
----------------------------------------------------------------------------
How do I write to and read from the UICR register?
* NRF5 SDK is used.

[Turbo J]

Reading and writing UICR uses the same method as with regular flash - that is either via NVMC (see PS) or via softdevice (as NVMC is restricted when softdevice is active).

[yokokawa]

Implemented flash ROM write / call method.
1) Even if the reading process is executed, data cannot be read, but no error will occur.
2) When the flash is initialized, 16 (address error) is returned.
3) Even if the write process is executed, data is not written, but no error occurs.
What are the mistakes in the program?UICR_Debug(20190904).zip

[Turbo J]

Fstorage module cannot access UICR.

Your code never enables the softdevice. This means you can use the nrf_nvmc_xxx functions from nrf_nvmc.h directly. These do support writing to UICR.

Warning: Erasing UICR kills the bootloader, and thus may brick the device (read: SWD access needed to restore functionality).

[yokokawa]

Please tell me the range to be deleted in case of "nrf_nvmc_page_erase (0x10001080);"

I don't know the range of deleting one page.Also, please tell me how to erase a narrow area.

If "nrf_nvmc_page_erase ()" and "nrf_nvmc_write_words ()" are used while UART and BLE are operating, it will stop.

Please tell me what to do before executing "nrf_nvmc_page_erase ()" and "nrf_nvmc_write_words ()".

After execution, “sd_nvic_SystemReset ()” will be executed.
Thanking you in advance

[Turbo J]

Trying to erase UICR while softdevice is running is a really bad idea. I strongly suspect an XY problem here.