TM4C123GH6PM: How to get an interrupt from UART for 1 byte (or odd bytes at all)?

I think that timeout is more flexible solution because I don't miss FIFO feature. Unfortunately I don't know how to use built-in UART timeout so I realized it myself with a separate timer.

Items which remain in FIFO I read after the timeout manually.

Receive timeout is used in exactly the same fashion as receive character. General structure of the interrupt

if receive timeout or receive character
empty FIFO

Of course you still need to deal with registers that clear on read but that's not new.

Robert

Pavel Mychko said:

Unfortunately I don't know how to use built-in UART timeout

You probably have this figured out by now, but that's just a matter of enabling the timeout flag on your uart interrupt:

UARTIntEnable(UART0_BASE, UART_INT_RT | UART_INT_RX);

Just add the _RT macro, and whenever your UART remains "some time without receiving anything", it will trigger that interrupt. This "some time" is automatic in the hardware, and generally speaking reflects the amount of time in which a new byte would come in at that given baud rate.

Bruno

It's very useful, thank you.