nRF52 UART locks up after OVERFLOW error

RE: nRF52 UART locks up after OVERFLOW error

jimparis_ — Thu, 02 Aug 2018 15:14:38 GMT

The real cause is likely this: devzone.nordicsemi.com/.../nrfx_uart-bug

RE: nRF52 UART locks up after OVERFLOW error

Gordon — Thu, 07 Sep 2017 07:35:20 GMT

And you have to totally uninit and reinit the UART to clear it? nRF51 had UART_ERRORSRC_OVERRUN_Clear, but it seems that nRF52 doesn't have that?

RE: nRF52 UART locks up after OVERFLOW error

Hung Bui — Wed, 06 Sep 2017 22:44:21 GMT

I don't think so. You need to clear the event directly by setting the event's flag to zero

RE: nRF52 UART locks up after OVERFLOW error

Gordon — Tue, 05 Sep 2017 07:47:01 GMT

Ok, thanks! Will that code also clear the overflow event?

RE: nRF52 UART locks up after OVERFLOW error

Hung Bui — Fri, 01 Sep 2017 12:58:38 GMT

Hi Gordon,

I afraid you will have to clear the event and reinit the uart drv:

nrf_drv_uart_uninit(&_uart_instance);
uart_init();

RE: nRF52 UART locks up after OVERFLOW error

Matt — Thu, 31 Aug 2017 14:38:40 GMT

You need to consult with the Nordic experts then. As for my own application (PC <-serial -> N52832 <-ble-> N52832) again I do not have the luxury of utilizing flow control (the usb to ttl console cable does not come with flow control lines!) so I just implement my own makeshift flow control in the application message layer.

RE: nRF52 UART locks up after OVERFLOW error

Gordon — Thu, 31 Aug 2017 13:56:18 GMT

I'm afraid not. It's for the Espruino JS interpreter so it's pretty general purpose and I can't guarantee there will always be flow control available. I'm honestly not worried about the overflows, it's the recovery afterwards that's an issue for me.

RE: nRF52 UART locks up after OVERFLOW error

Matt — Thu, 31 Aug 2017 13:40:10 GMT

Can you enable flow control here? Does the other end (eg. the PC end) support the flow control lines ?