why nRF52 DK is getting restarted when rx pin is floating??

[vprasath]

Hi,

My nRF52 DK is getting restarted when the RX pin is at float.

what could be issue? Need your support

Thanks in advance.

[Jørgen Holmefjord]

Most likely noise on the floating pin is causing errors. Please try debugging and see if you get the event APP_UART_COMMUNICATION_ERROR in uart_event_handle. The error code  is passed to APP_ERROR_CHECK, which by default will reset the chip. 

[vprasath]

Hi ,

I'm getting APP_UART_COMMUNICATION_ERROR in the uart_event_handle.

How do i rectify this error??

My RX pin is connected to Quectel Module,still it is getting APP_UART_COMMUNICATION_ERROR.

Thanks in advance.

[Jørgen Holmefjord]

I do not know how this module handles the input, but if it cause errors you will need to ignore the errors until the line is stable. Have you checked the line with a scope, etc., to see if there is noise on the line?

[vprasath]

Hi,

I have checked by keeping the oscilloscope in rx pin whether the noise is there on that line ,But when i keep the oscilloscope on the RX pin the device is getting restarted?? 

How could i solve this problem??

[Jørgen Holmefjord]

To avoid resetting the device when you get the error, you need to avoid passing the error to APP_ERROR_CHECK() in the UART event handler when you get the APP_UART_COMMUNICATION_ERROR event.