Error in UART Reception

[SKris.13]

We are using STM32F401RE for our people counting project. We need to receive a value using UART reception and tried several methods. For transmitting we are using printf() function, for reception we have tried with HAL_UART_Receive() api but it didn't work. For reception, if we want to use scanf(), what changes we need to do? We are attaching the project file.

[Tesla DeLorean]

You'd likely need to implement an fgetc() function, and address the potential issue with the polled HAL USART functions blocking.

[SKris.13]

Since I am new to ST programming, Can you please explain how to implement an fgetc() function using HAL USART functions.