how to write UART Interrupt handler

[Gotak]

Hi 

I am trying to use UART from the peripheral UART example from zephyr SDK nRF connect and It is working,

But the UART is initialized in main, How do I re write the code using an interrupt handler as in when ever I give a text in my standard input (terminal) I should get the uart initialized, and the entered text from the terminal should be given to UART RX.

Thanks,

Gotak

[Gotak]

My requirement is:

UART should be initialized and when ever I am giving any input through UART then it should be ready to take the input

[AHaug]

Hi,

The UART implementation in the Peripheral UART sample does exactly what you're describing as your needs. 

It creates a write thread where it sends data that has been put into a FIFO in the uart_cb (callback) function which is triggered by an interrupt.

Kind regards,
Andreas

[Gotak]

Hi Andreas,

I see,...the peripheral UART example I have integrated other functions in the code so as I am initializing the UART in main function I am calling other custom functions after uart_init().

So in this case.....the uart is initializing and REQUESTING for UART RX and immediately implementing other function I have written after the uart_init() and not giving enough time for me to give input, so I have tried giving 10 seconds delay then it is working properly. 

But! I have limit the UART input functionality only for that 10 seconds so I wanted to use UART interrupt handler.

If the peripheral UART example could work for the context I have described above how do I do it without giving any delay?

If you could make this ticket private I can share you the code, it would be easy for you to understand.

Thanks,

Gotak

[Gotak]

Hi,

Just wanted to check if there is any insight regarding my query:)

Thanks, 

Gotak

[AHaug]

Hi,

Apologies for the delay. 

Another option could be to investigate a colleague of mines sample showcasing asynch uart https://github.com/too1/ncs-uart-async-count-rx. It does the same UART transport as the peripheral_uart sample, only with double buffers.

There is also the topic of serial communication using UART on our academy pages: https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/lessons/lesson-4-serial-communication-uart/

Regarding your request of how to do this without adding a delay, could you verify my understanding: You want to only be able to give input that will be transmitted over UART during a 10 second window, and you don't want this input to be transmitted before the 10 second window has passed. Is this correct?

Kind regards,
Andreas