UART cann't receive data when using nRF5_SDK_12.1.0_0d23e2a in ble_app_multilink_central example

[Alice]

Hi,

I'm using the ble_app_multilink_central example in the newist SDK nRF5_SDK_12.1.0_0d23e2a, nRF52832. Now it can printf the log information. I want to use the uart to receive and send data from other MCU. So I add the app_uart_fifo.c document and add the uart_init() function according to the ble_app_uart example, but the uart cann't receive or send data.

Besides, before I add the uart_init function, the ble_app_multilink_central example can printf log information but I don't see any setting about the UART. I don't know why.

Thanks for your help

[FormerMember]

For the log information you will have to use RTT. There is only one UART module on the nRF52832, if you are sending/receiving data from another MCU over UART, the log module cannot use UART.

To enable logging over RTT, go to sdk_config --> configuration wizard tab --> nRF_LOG section: Enable logging over RTT by checking the box "NRF_LOG_BAKEND_SERIAL_USES_RTT". Disable logging over UART by un-checking "NRF_LOG_BACKEND_SERIAL_USES_UART".

[FormerMember]

Did you remember to change the UART pins in uart_init(..), so that they match the ones used for communication with the other MCU?

[Alice]

Yes, I have changed the TX and RX pins to P0.09 and P0.10 in uart_init(..) and I use two terminals on the PC. I'm using PCA10040 board. Do I need to do any ohter things? Thanks

[FormerMember]

There is a UART example in the SDK, you could perhaps check if you are able to make your device communicate with that device. To check if board two receives data, the data can be printed over RTT.