Understanding LPUART_UART_IP_EVENT_END_TRANSFER event and how to stop it

[aadyaa]

I am currently working on UART communication, I have successfully managed to receive data over UART using DMA,
but I have encountered a query related to the events I'm receiving in the UART callback function.

During the UART Receiption and Transmission process, I am noticing that I receive two events.
The first event is LPUART_UART_IP_EVENT_RX_FULL which implies data has been received.

Immediately following this, I receive a second event labelled LPUART_UART_IP_EVENT_END_TRANSFER.

I'm writing to seek clarification regarding the purpose and signnificance of the
LPUART_UART_IP_EVENT_END_TRANSFER and Is their any way to stop the second event
from occurring as we already know from the first event that already data received.

[PetrS · Accepted solution]

Hi,

yes, driver is written this way. If you look over ISR routine at the end of transfer two callbacks will be called with events you mentioned.

The LPUART_UART_IP_EVENT_RX_FULL which is called first allows you e.g. to update buffer (using SetRxBuffer) and so continuous reception can be done.
For a LPUART_UART_IP_EVENT_END_TRANSFER reception is finished and user will need to call receive function again to start new reception.
If you need to omit second callback the only option I think is to comment line that invokes a callback.

BR, Petr