NRF_ERROR_SVC_HANDLER_MISSING of uart

[strengthstrong]

When I use uart to transfer data, sometimes I get error NRF_ERROR_SVC_HANDLER_MISSING in APP_UART_COMMUNICATION_ERROR when I start sending data. Sometimes this error occurs after a few minutes of transmission. My transmission rate is not high. This error causes the card to die. I want to find the reason. I saw a head file error on the forum, but I confirmed that I am not wrong, except for this, what are the possible reasons?

[Einar Thorsrud]

Hi,

There is a issue with the logging of the UART communication error in the default error handler. It assumes that the error code is a standard nRF error code, but in fact the error code you get in case of a APP_UART_COMMUNICATION_ERROR is the content of the ERRORSRC register. So value 1 is not NRF_ERROR_SVC_HANDLER_MISSING, but rather an overrun error (1, i.e. the least significant bit is the OVERRUN field in ERRORSRC: "A start bit is received while the previous data still lies in RXD").

It would seem that for some reason you are not able to process the data fast enough in some cases. Perhaps you get a interrupt at a "bad time", or something else. The best way to handle this is probably to use flow control if possible.