How to handle the crash about APP_UART_COMMUNICATION_ERROR

[Yong.Xie]

Hi there:

     I'm now developing a product with 51822 using the SDK10.0 . The product communicate with another chip through UART. 

     My problem is when the UART crash with error code APP_UART_COMMUNICATION_ERROR(The error source is FRAMING ERROR), how can I recover the UART without reset 51822 ?

     I  have tried to re-init the UART when error occures, but it seems not working.

[awneil]

A framing error just means that the UART thought it saw a start bit, but then couldn't recognise a valid frame (byte, character) following it.

Most likely due to noise on the line.

I can't see any reason to re-initialise the UART after a Framing error.

It's up to your application how to handle the situation.

None of this has anything specifically to do with Nordic.

But the way (some of) Nordic's examples handle framing errors is particularly daft:

https://devzone.nordicsemi.com/f/nordic-q-a/41480/multiperipheral-nus-crashes/161677#161677

[Yong.Xie]

Hi awneil， Your are right there is no reason to re-initialise the UART after framing error.

If clear the ERROR REG, the RX task will still running.

Pull up RX pin is a good idea for RX stable.

I think maybe I have found the reason why UART  “crash” after error.

See the picture below. The SDK will stop the UART when ERROR occured. So I delete those code and test my product.

Now it's stable...