Problems with UART in 52840

[Avi]

I am using a code similar to App_uart_C from SDK17.02 - central sending data over uart to another peripheral.

After 30-60 sec, the operation stops probably due to an error in the UART and I need to reset the chip

How can I handle UART errors ? I don't mind loosing data - but I cannot stay with the software crashing

Thanks

Avi

[Jørgen Holmefjord]

Hi,

It does not sound like a very reliable way to resolve the issue with a delay, and this could also increase the current consumption of your device.

If you can explain where the error occurs, and what the error is, I can help you find a better solution. If the chip "stops", it is most likely ending up in the error handler, because an error code was passed to APP_ERROR_CHECK() macro, and you have built the application in debug mode. You do not have to pass all error codes to this macro, it is fully up to you how you handle an error. For instance, if you get a NRF_ERROR_NO_MEM error from a call to app_uart_put(), you can filter this error and tell your application to retry the operation at a later point.

Best regards,
Jørgen

[Jørgen Holmefjord]

Have you considered adding HWFC pins to the UART in your application? If you are not able to process the FIFO fast enough, the incoming stream of data may overflow the UART, causing an error.

You can try to remove the APP_ERROR_CHECK in APP_UART_FIFO_ERROR case in uart_event_handle(). This will ignore any OVERRUN/PARITY/FRAMING/BREAK errors from the UART peripheral, which may lead to data loss.

case APP_UART_FIFO_ERROR:
    //APP_ERROR_HANDLER(p_event->data.error_code);
    break;

[Avi]

Can I send it in private mail?

[Avi]

Hi Jorgen, 

Did you get the code?

Thx

Avi

[Avi]

Please update if you got my code with the problem of SDK17.02 vs. SDK15

[Jørgen Holmefjord]

I received your code, but I have not found a solution for you yet. Will get back to you as soon as possible.

[Avi]

After several attempts to focus on the exact reason for the failure, I am now sure that it is due to RX error that is causing an error which is non recoverable. 

I am streaming data into the chip via UART interface at 38K (not able to use FC). Is there a recommendation on how to handle such error? i.e. any signals from the uart driver that can be used in advance?