how to connect to nRF5340 from smart phone?

[woff]

Hello ,I just buy nRF5340 pdk and look at user guide https://infocenter.nordicsemi.com/pdf/getting_started_NCS_nRF53.pdf.
I installed nRF Connect in my PC, and flash HEART HEX to nRF5340.
I installed Nordic nRF Toolbox app in my smart phone for Android OS,
but my phone can't scan nRF5340 PDK devices.
My phone is samsung A8 and HTC U11+ for Android 7.1 .
Please help me, thank you.

[Nikosant03]

Hi woff,

Install nRF connect from app store. Then flash your nRF5340 using one of the ble peripherals example provided by Nordic's SDK (I suggest you starting with the bliky example). After flashing your board it will start adverising it self for a period specified on the example. During the advertising period you will be able to scan your device using your phone as central. Open the nRF Connect app and you will normally see your nRF5340 advertising.

Hope that helps.

[woff]

Where is bliky example.

Please give me URL.

Thank you.

[Nikosant03]

Download the latest SDK.

www.nordicsemi.com/.../Download

Then navigate to examples -> ble_peripherals -> blinky example

infocenter.nordicsemi.com/.../ble_sdk_app_blinky.html

[woff]

I do that, and write nRF5SDK17009d13099\nRF5_SDK_17.0.0_9d13099\components\softdevice\s112\hex

to nRF5340.

But I have problem.

My nRF5340 have logs (

INFO Model: NRF5340_xxAA_ENGA.
2020-08-16T15:06:41.202Z ERROR Error when getting device info: Error: Error: Error occured when open device long term. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: INVALID_OPERATION (fffffffe)

2020-08-16T15:06:41.208Z ERROR Error when closing nrfjprog: Error: Error occured when close opened device. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: INVALID_OPERATION (fffffffe)

).

I can't write hex to nRF5340 anytime.

How to reset or clear my nRF5340?

help me , thank you.

[woff]

I try to connect reset and Vdd pin. 

I reset com port data.

but it have logs(

2020-08-16T15:34:19.768Z ERROR Error when closing nrfjprog: Error: Error occured when close opened device. Errorcode: CouldNotResetDevice (0x5)
Lowlevel error: CANNOT_CONNECT (fffffff5)

2020-08-16T15:34:19.768Z INFO Model: NRF5340_xxAA_ENGA.
2020-08-16T15:34:19.771Z ERROR Error when getting device info: Error: Error: Error occured when open device long term. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: INVALID_OPERATION (fffffffe)

2020-08-16T15:34:19.773Z ERROR Error when closing nrfjprog: Error: Error occured when close opened device. Errorcode: CouldNotOpenDevice (0x4)

)

How to do?

Help me, thank you