Redirect Printf and Scanf to interrrupt driven UART

[David_]

This example work perfectly using non interrupt driven UART HAL library, HAL_UART_Receive and HAL_UART_Transmit

Any idea on changing to HAL_UART_Receive_IT and HAL_UART_Transmit_IT?

Many thanks

https://forum.digikey.com/t/easily-use-scanf-on-stm32/21103

[Tesla DeLorean]

Use ring buffers to hold the data and service the interrupts.