Disconnection immediately from my IPhone

[Angelo Cotroneo]

Hi all,

I have a problem when I connect the nRF51822 to my phone.

I use the softdevice S130 and the  following code attach ble_app_uart_adc_scan_mode.7z.

When I use the nRFconnect in my phone, I see the link so I connect to nRF51822 but after the connection it immediatley stop the connection.

The trasmission via uart works properly.

What is the problem? Can you help me?

Thank a lot

[awneil]

Have you looked at the nRFConnect logs to see what's happening?

Have you instrumented your code and/or used the debugger to see what's happening at the device end?

https://www.argenox.com/library/bluetooth-low-energy/ultimate-guide-to-debugging-bluetooth-smart-ble-products/

[Angelo Cotroneo]

Hi,

thank a lot for the answer. In the attach you can find what happen in nRFConnect

Regarding your second question I don't have a debugeer :-(

[Edvin]

Hello,

Angelo Cotroneo said:

Regarding your second question I don't have a debugeer :-(

What HW are you running on, if it is not an nRF51DK?

Development without a debugger is very difficult. I suggest you get hold of one.

Even if I try to run your project, it may not behave the same on a DK as on your PCB. Different pinout (floating input pins), XTAL settings, and so on can make a huge difference .

[awneil]

Edvin said:

Development without a debugger is very difficult. I suggest you get hold of one

Absolutely!!

Debugging is a key part of development - you can't expect to just write a whole load of code, and have it "just work"

How To Debug.

[Angelo Cotroneo]

Can you suggest me a good debugger?

[Edvin]

I can recommend the nRF52DK, the nRF52840DK and the nRF51DK, depending on what chip you intend to use. They all have on board debuggers, which you can also use to debug external devices. 

If you are looking for a debugger only (not SDK), I suppose a JLink would work.

The DKs are cheap compared to professional debuggers.

[Angelo Cotroneo]

Thank you for the answer. I am using nRF51822 so I can buy the nRF51K.

[awneil]

Note that nRF51 devices are not recommended for new BLE designs - and hasn't been for some time now:

https://devzone.nordicsemi.com/f/nordic-q-a/42960/status-of-nrf51-products/169728#169728