nrf51822 Central disconnection problem

RE: nrf51822 Central disconnection problem

Aymen Rejeb — Wed, 27 Jul 2016 12:38:01 GMT

The non-Nordic peripheral works correctly with the central (ble_app_uart_c) on nRF51 DK. I also connect to it using an android application (Like BLE scanner) and everything is alright.. this is weird!

RE: nrf51822 Central disconnection problem

Petter Myhre — Wed, 27 Jul 2016 11:24:01 GMT

Then I would suspect the problem is with this non-Nordic peripheral :)

RE: nrf51822 Central disconnection problem

Aymen Rejeb — Wed, 27 Jul 2016 11:05:31 GMT

Hi Petter,

ble_app_uart_c on ISP130301 is working perfectly! and connects to the ble_app_uart (on the nRF51 DK) without any problems.

I have attached the ISP schematic, a picture, and the sniffing trace (trace_27_07_16.pcapng).

Many thanks

RE: nrf51822 Central disconnection problem

Petter Myhre — Wed, 27 Jul 2016 09:23:12 GMT

What happens if you run ble_app_uart on the nRF51 DK and ble_app_uart_c on ISP130301? Could you upload the schematic and an actual picture of the ISP130301?

RE: nrf51822 Central disconnection problem

Aymen Rejeb — Tue, 26 Jul 2016 14:20:17 GMT

Hi Petter,

I was trying both clock configurations that you suggested, I also tried all the other clock options but the central still disconnecting! Please note that the ISP130301 module is working perfectly as a peripheral! do you have any other suggestions that we should try?

RE: nrf51822 Central disconnection problem

Petter Myhre — Tue, 26 Jul 2016 12:47:39 GMT

I see from the datasheet that the frequency tolerance of the low frequency crystal is +-40 ppm, but in the code you have used NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, see ble_stack_init(). Maybe you can try with NRF_CLOCK_LFCLKSRC_XTAL_50_PPM or NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_4000MS_CALIBRATION and see if that makes any difference?

RE: nrf51822 Central disconnection problem

Aymen Rejeb — Tue, 26 Jul 2016 11:52:31 GMT

Actually when running the central on nRF51-DK (PCA10028) everything is working fine, the peripheral never disconnects! The trace I provided is for central on ISP130301, I'm using:

Softdevice: s130_nrf51_1.0.0_softdevice
SDK: nRF51_SDK_10.0.0_dc26b5e
nRF51822 revision: please see attached screenshot (using nrf_ic_info_get function)

To connect to the peripheral I'm using the the ble_app_uart_c project from the SDK (after made few modifications on the code and the project settings), I have attached the project you can take a look on it, maybe it could help!

I have already checked that no hard fault neither a reset is happening! I was using Keil for debugging this and to see the disconnection reason (see above attached screenshot)

Thank you

RE: nrf51822 Central disconnection problem

Petter Myhre — Tue, 26 Jul 2016 10:20:20 GMT

Please edit your question and upload the trace there. Are you running the central on the nRF51-DK or the ISP130301? It seems you are right, something happens with the central, it stops transmitting, and the peripheral hits the supervision timeout. I'm not sure what could be causing it. What SoftDevice and SDK version are you using? Do you have any more information than that it is CEAA? So we can figure out what revision the nRF51822 chip is? The next step is to figure out what is happening on the chip. Do you get a hard fault? A reset? Something else?

RE: nrf51822 Central disconnection problem

Aymen Rejeb — Tue, 26 Jul 2016 09:15:46 GMT

Hi Peter, In order to be able to attache the Wireshark trace, I have added an answer below! please take a look on it, thanks

RE: nrf51822 Central disconnection problem

Petter Myhre — Mon, 25 Jul 2016 12:15:06 GMT

I guess it is having trouble connecting to the peripheral and/or keeping the connection. Could you sniff what is happening on air? You can use the nRF Sniffer.

RE: nrf51822 Central disconnection problem

Aymen Rejeb — Fri, 22 Jul 2016 13:18:31 GMT

Anyone have an idea about such issue ?