BLE App Uart nRF52810

[berkutta]

I'm trying to get the ble_app_uart example working on a nRF52810. I'm using SDK 15.2.0 together with Softdevice S112.

The infocenter says the Example needs Softdevice S132 or S140 http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.2.0%2Findex.html. But that's not available for nRF52810. So what's the solution to run the ble_app_uart demo on the nRF52810?

If I try to use the ble_app_uart on the nRF52810 with the pca10040e then it doesn't work. I don't get UART output and also don't see any UART device with the nRF Connect App.

[berkutta]

Hi,

Thanks! The Reset Pin was the issue, it's now working! What I don't understand is, if I understand correctly the -DCONFIG_GPIO_AS_PINRESET flag enables this feature. But that's also enabled on the ble_app_beacon example. But the beacon example is working without hooking up P0.21 to VCC.

[berkutta]

hmm, it's a bit strange. I have disabled the -DCONFIG_GPIO_AS_PINRESET, erased the chip and reflashed everything. But the reset seems to be still active. My Hardware leaves P0.21 floating

The PSELRESET register looks like that:

nrfjprog -f NRF52 --memrd 0x10001200 --n 8          
0x10001200: FFFFFFFF FFFFFFFF                     |........|

[Vidar Berg]

Pinreset should not have been triggered if  P0.21 was left floating. I suspect the actual issue is floating RX input: https://devzone.nordicsemi.com/f/nordic-q-a/40625/app_ble_uart-uart-must-be-hooked-up

[berkutta]

Hi,

Yep, I can confirm that this was the root issue. I thought it's resetting due to P0.21 but I was also unintentionally touching RX with my hands (and thus causing the APP_UART_COMMUNICATION_ERROR event). With enabling the Pullup or disabling the UART module it's fixed.

Thanks for the first class support Vidar Berg