I’ve come to a problem that i’d like to recieve multiple inputs from an USART in my stm32f4
For example if i press and hold A then S then D on my keyboard (without letting go of A and S) then do something like printing out a value.

I know USART can only recieve one input but is there a way using some kind of buffer or interrupt to simulate it at least like this.
An example would be nice.
Thanks!