BLE disconnected while using virtual UART and HW_UART

[sagarnayakm]

Hello,

In my project i am using nrf52840 and i have change the default UART pins to P1.3 (TX) and P1.4(RX) and while using virtual UART like BLE UART  i mean in the sense sending data from the APP TO MCU and vice versa here at the same time if  i am trying to use the HW_UART BLE gets disconnected.

1. why its happening like this.??

2. Please suggest me to resolve this.

thank you.

[sagarnayakm]

Hello,

Thanks for the reply, after i have change the code as you said i got this error

<error> app: ERROR 1 [NRF_ERROR_SVC_HANDLER_MISSING] at C:\A\DeviceDownload\nRF5SDK1702d674dde\nRF5_SDK_17.0.2_d674dde\examples\ble_peripheral\ble_app_uart -3085\main.c:752
PC at: 0x0002C0C9
<error> app: End of error report

so any issue in the hardware side.??

thank you.

[Susheel Nuguru]

There is a logging bug in the uart error handler passing on the uart error as  NRF_ERROR_SVC_HANDLER_MISSING. I thought it was fixed in the latest nRF5 SDKs but I might be mistaken.

You need to check how you are handling this error from the uart. If this is an overrun error, then it happens more frequently when you are not using any HW flow control.

[sagarnayakm]

Hello Susheel,

thanks for the reply, 

Susheel Nuguru said:

You need to check how you are handling this error from the uart. If this is an overrun error, then it happens more frequently when you are not using any HW flow control.

In the uart_init() i have enabled the HW_flow_control aslo but no use still its happening like this.

i think in the uart_event_handler() i am trying to receive sensor data sometimes uart_communication error will raised so what exactly happening and receiving a sensor data is a problem or any other issues.??

thank you.

[Susheel Nuguru]

depends on what error it is.
You can check the source of the error when using app_uart like below in the uart callback handler

        case APP_UART_COMMUNICATION_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_communication);

If using nrfx drivers, you can directly get and clear the errorsrc usingnrfx_uarte_errorsrc_get. Based on the type of error you get, you can handle that error as per the application need (for example, flush the RX FIFO or restart the uart communication etc)

.