GPREGRET - Hold the state of GPIO and state

[Lucasm27]

Hi everyone!!! I need help with our new version of HW after validating the previous one that works.

I read some similar posts related to the GPRETREG for HOLD a GPIO while the DFU is performing.

I have a "smart power button " STM6601 to power up the system.

The code used in the previous version for hold the state is the following:

static void buttonless_dfu_sdh_state_observer(nrf_sdh_state_evt_t state, void * p_context)
{
    if (state == NRF_SDH_EVT_STATE_DISABLED)
    {
        // Softdevice was disabled before going into reset. Inform bootloader to skip CRC on next boot.
        nrf_power_gpregret_set(BOOTLOADER_DFU_GPREGRET );
        nrf_power_gpregret2_set(  BOOTLOADER_DFU_SKIP_CRC);

        //Go to system off.
        nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF);
    }
}

HW changes ( Shortage :( )

I changed the BLE module:

Fanstel : 840F --------------> Ublox: NINA- B306

Fanstel chip version

Ublox chip version

Any suggestion or recommendation to test will be grateful!!

Best regards.

[Einar Thorsrud]

Hi Lucas,

Resets are performed during DFU, and during a reset most registers (including all GPIO configuration related registers) are reset to the default value. So there is no way you can avoid this. You need to design your HW so that a reset does not cause problems.

Einar