UART/Serial Port Emulation over BLE example doesn't receive over UART (only transmits)

[KSV]

I successfully compiled and loaded the UART/Serial Port Emulation over BLE example on an AdaFruit Feather board.

I can connect to the Nordic UART Service, then send data from the nRF Connect app (Rx Characteristic) to the Feather board (nRF52832) and see the data go out the Feather/nRF52832 UART and into my UART USB dongle and appear on the Linux minicom terminal.

What doesn't work is:

1) I never see the "UART started!" string when the application first starts.

2) I type characters (with newline) on the Linux minicom terminal and I can see on the oscilloscope data on the Feather/RF52832 Rx line, but the application never sees an RX data interrupt fire, and therefore never sends the characters across BLE to the nRF Connect app.

Ubuntu Linux 16.04.6 LTS

S132 SoftDevice v7.0.1

Nordic SDK v16.0.0

(Downloading 'ble_app_uart_pca10040_s132.elf' to J-Link)

[Mttrinh]

Hi,

Are you using an unmodified version of the UART example in the SDK? Have you tried debugging and see if you get any errors?

[Mttrinh]

Hi,

1) It might be that you have set the RX pin as output somewhere in your application. You can try to configure the pin as a general input pin and see if you can trigger an interrupt with it.

As for 2) and 3), I would suggest to test another Adafruit Feather board and see if you can reproduce the same issue.