Delay between nrf_drv_uart_rx_abort (sends NRF_UARTE_TASK_STOPRX) to enter to event handler.

[VadymS]

Hi.

I work with PCA10040 and SKD_14.2. 

I use UARTE with easy DMA.
I see big enough delay between sending nrf_drv_uart_rx_abort and entering to UART event hanler. What is the latency should be in this case?

Thanks.

[VadymS]

This my own conclusion, when i returned to timing optimization of the project.

I see that few guys have the same problem with interrupt latency. 
NRF driver inserts significant delay to the interrupt handler latency, while the interrupt latency itself is in spec value.

[Susheel Nuguru]

Vadym, 

VadymS said:

NRF driver inserts significant delay to the interrupt handler latency

You are right that nrf drivers do insert some delay, but if it is significant or not depends on each use case. If someone is developing an application that has serious constraints on servicing the interrupt as fast as possible, then you could always strip away the features in that driver that you do not need and hence make the ISR smaller.