erasing uicr affect gpios read

Question

hi Nordic

i am working with nrf52832, running with zephyr and ncs1.91

i had to use nrfjprog -- eraseuicr to change serial number on 0x10001080 and after that something strange had happen an ADC read of a certain GPIO suddenly became zero

any idea what possible configuration may have been deleted

i also should mension that on the same board if i run an older version of the code which uses the SDK11.0 then it samples this GPIO just fine and when flashing the new Ncs application before erasing the uicr the GPIO ADC read is fine as well

the GPIOs in hand are (from dts):

enable_gpios = <&gpio0 9 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;
adc_read_gpios = <&gpio0 30 (GPIO_OPEN_SOURCE)>;

also for some reason when i try to read uicr to see what values has changed, i come to this erroe:

canary-ep git:(release) nrfjprog --readuicr ~/workspace/uicr    
Reading UICR.
Storing data in '/home/zhershkovitch/workspace/uicr'.
 was not recognized as supported.
ERROR: Command executed requires write permission in the current directory.
➜  canary-ep git:(release) sudo nrfjprog --readuicr ~/workspace/uicr.txt
[sudo] password for zhershkovitch: 
Reading UICR.
Storing data in '/home/zhershkovitch/workspace/uicr.txt'.
.txt was not recognized as supported.
ERROR: Command executed requires write permission in the current directory.

any ideas why is that and how can i read the whole uicr ( and not just few bytes at a time with 'nrfjprog --memrd 0x10001080 --w 32 --n 32' )

hope to read from you soon

best regards

Ziv

ziv123 · Accepted Answer

found the issue 
 pin p0.09 on nrf52832 is an NFC pin and when erasing the UICR it returns to it's default which is UICR, if i want to be using it as a GPIO i need to add this config to my baord .conf file: 
 
 CONFIG_NFCT_PINS_AS_GPIOS =y 
 
 that way even after erasing UICR i still uses the pin as a GPIO 
 
 best regards 
 Ziv

erasing uicr affect gpios read

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