APP_UART_COMMUNICATION_ERROR on app UART event handler when connected to BMD101

[Gaurav Dubey]

I am using the NRF52840 controller to connect BMD101(ECG sensor) uart based having a baud rate of 57600.

Note: Using UART peripheral example on SDK17

I am trying to parse the UART data as per the sensor datasheet (Given here)and the sensor is working fine with other hosts(UART COM PORT on PC).

As soon as I start the sequence and the sensor got enable, the event handler keeps on throwing APP_UART_COMMUNICATION_ERROR, and when I try to read FIFO in between using

app_uart_get API, it returns error code 5.

[Jørgen Holmefjord]

Hi,

The communication errors corresponds to the error bits in ERRORSRC register. Error 4 (FRAMING) typically means that the level of the UART RX line is incorrect (low when it should be high, etc). Error 1 (OVERRUN) means that the internal FIFO in the UART(E) peripheral is full and incoming data will be lost. This happens if the application does not read our the data fast enough after enabling UART RX.

Can you post your code used for initializing and reading/writing the UART? You can avoid the reset by not passing the error to APP_ERROR_CHECK in the UART event handler in case of a APP_UART_COMMUNICATION_ERROR event.

Best regards,
Jørgen

[Gaurav Dubey]

It resolved my issue when I ignore the app error check just at beginning for communication error case in error handler  and as soon as data reception begins and gets synchronised it doesn’t appear.