In this video I show how to setup the UART to receive using an interrupt so that the UART isn't constantly polling for information. This is useful for setting command line tools for testing your device.
Also here is the link to the GitHub repo where all this code is available https://github.com/rbevin777/STM32-Tutorials-NucleoF334R8T6
Just clone the repo and switch to the branch you want.
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Get Started With STM32 and Nucleo Tutorial - UART Rx Interrupt | NatokHD