Function arduboy_rust::serial_print::available

pub fn available() -> i16

Get the number of bytes (characters) available for reading from the serial port. This is data that’s already arrived and stored in the serial receive buffer (which holds 64 bytes).

Example

if (Serial::available() > 0) {
    // read the incoming byte:
    incomingByte = Serial::read();

    // say what you got:
    Serial::print("I received: ");
    Serial::println(incomingByte);
}