52832 weird Reset pin behaviour

RE: 52832 weird Reset pin behaviour

Nick_RA — Tue, 07 Mar 2023 16:46:51 GMT

Thanks that was the problem... erasing the entire flash sorted it.

RE: 52832 weird Reset pin behaviour

Susheel Nuguru — Tue, 07 Mar 2023 14:07:46 GMT

[quote user=""]2. I've now removed CONFIG_GPIO_AS_PINRESET from the project preprocessor directives, now the project starts. BUT - I notice that the button still resets??? Is this correct, if so how do I disable reset on the pin?[/quote]

Are you sure that you removed CONFIG_GPIO_AS_PINRESET and erased the whole chip before reprogramming it? it is important that you erase the whole flash including the UICR registers (nrfjprog -e or nrfjprog --recover).

For me it seems like you are reprogramming using --sectorerase which keeps the UICR value as is.

RE: 52832 weird Reset pin behaviour

Nick_RA — Mon, 06 Mar 2023 12:04:34 GMT

Hi Thanks for the reply. I don't actually want to use any external reset pin. From the article I linked to above:

"If you dont want to use reset, just leave this pin floating - as long as you don't explicitly enable reset pin, it won't work. If you want to use it, don't leave it floating - use external pull-up."

Below are the preprocessor deinitions, so NRF52832_XXAA (pin 21) is currently defined. I would like to leave the pin floating, but I'm concerned that it is still an active reset. I don't want the pin active, or piulled up, as this is a power-sensitive application.

APP_TIMER_V2
APP_TIMER_V2_RTC1_ENABLED
FLOAT_ABI_HARD
INITIALIZE_USER_SECTIONS
NO_VTOR_CONFIG
NRF52
NRF52832_XXAA
NRF52_PAN_74
NRF_SD_BLE_API_VERSION=7
S112
SOFTDEVICE_PRESENT
MBEDTLS_CONFIG_FILE="nrf_crypto_mbedtls_config.h"

RE: 52832 weird Reset pin behaviour

Susheel Nuguru — Mon, 06 Mar 2023 11:45:59 GMT

Which pin number are you using as reset on your custom board? We have this in our system_nrf52.c is as below

#if    defined (DEVELOP_IN_NRF52805) \
    || defined (DEVELOP_IN_NRF52810) \
    || defined (DEVELOP_IN_NRF52811) \
    || defined (DEVELOP_IN_NRF52832)
    #define RESET_PIN 21
#elif  defined (DEVELOP_IN_NRF52820) \
    || defined (DEVELOP_IN_NRF52833) \
    || defined (DEVELOP_IN_NRF52840)
    #define RESET_PIN 18
#elif  defined (NRF52805_XXAA) \
    || defined (NRF52810_XXAA) \
    || defined (NRF52811_XXAA) \
    || defined (NRF52832_XXAA) \
    || defined (NRF52832_XXAB)
    #define RESET_PIN 21
#elif  defined (NRF52820_XXAA) \
    || defined (NRF52833_XXAA) \
    || defined (NRF52840_XXAA)
    #define RESET_PIN 18
#else
    #error "A supported device macro must be defined."
#endif

Have you configured the right pin number to be connected to reset in your system_nrf52.c file to match your custom layout?