Printf and Getchar (Inter.mode) via USART2 plus Timer in PWM mode

This example is based on NUCLEO-F030R8 and STM32CubeIDE and show how to:

• Redirect the printf to USART2
• Getchar via USART2 in Interrupt mode
• Timer (TIM14) in PWM mode at 50% of duty cycle

For more info see here.