Issue with 1.8V Control and DFU on nRF5340

RE: Issue with 1.8V Control and DFU on nRF5340

erifat — Tue, 18 Feb 2025 10:35:32 GMT

Yes, I mean that the reset issue does not occur when I set "CONFIG_SERIAL=y."

RE: Issue with 1.8V Control and DFU on nRF5340

Vidar Berg — Tue, 18 Feb 2025 07:05:46 GMT

You mean you don't see the reset issue if you set CONFIG_SERIAL=y? It would also be good if you could check the reset source like here: https://github.com/nrfconnect/sdk-nrf/blob/0d455a2454f4afb20d218cdec9c1922101e02d39/samples/nfc/system_off/src/main.c#L216

RE: Issue with 1.8V Control and DFU on nRF5340

erifat — Mon, 17 Feb 2025 13:21:52 GMT

Hello ,When I set CONFIG_SERIAL=n, the issue occurs, and we only use the output for printf. There is no UART usage in the project. When CONFIG_SERIAL=n, I can't even see the reset issue.

After investigating further, it seems that rebooting the device while it is awake resolves the issue. However, if I reboot while the device is in sleep mode, the problem persists.

Here is the relevant code:

int system_sleep_wake(uint8_t new_state)
{
    if(sleepWakeFlag == new_state) return 0;

    printf("System Sleep Wake\n");
    buck1Control(new_state);
    printf("Buck1 Control ok\n");
    control_sensor_state(new_state);
    printf("Control Sensor State ok\n");
    control_afe_state(new_state);
    printf("Control Afe State ok\n");
    control_peripheral_state(new_state);
    printf("Control Peripheral State ok\n");
    //bt_conn_unref(!new_state);
    // pm_state_force(0, &(struct pm_state_info){PM_STATE_SUSPEND_TO_IDLE, 0, 0});
    sleepWakeFlag = new_state;

    if(new_state == true)
    {
        if(apk_init() != 0)
        {
            perp.Afe = 55;
            printf("APK Init error\n");
		}

        printf("APK Init ok\n");
    }
    else
    {
        printf("APK Uninit\n");
        apk_uninit();
    }

    return 0;
}

void buck1Control(bool new_status)
{
    if(new_status == false)
    {
        if (regulator_is_enabled(buck1)) {
            regulator_disable(buck1);
            printf("******************1.8V Disable\n");
        }
    }
    else
    {
        if (!regulator_is_enabled(buck1)) {
                regulator_enable(buck1);
                printf("************1.8V Enableee\n");
        }
    }
}

When I reset the device while it is awake, it enters low-power mode correctly. However, if I reset it while in sleep mode, nothing changes.

Apologies if I am misinterpreting something. This issue has been quite challenging for me.

Thanks!

RE: Issue with 1.8V Control and DFU on nRF5340

Vidar Berg — Fri, 14 Feb 2025 13:27:56 GMT

Hello,

Are you exposing any UART interfaces on your device, or did you just find that enabling the UARTE instance(s) in your bootloadermade the problem go away? Also, please check what the reset source was after the reset from the RESETREAS register.

Thanks,

Vidar