Merge pull request #490 from jannic/pico_usb_serial_fmt_string

Extend pico_usb_serial example with some string formatting
This commit is contained in:
Jan Niehusmann 2022-11-02 00:12:02 +01:00 committed by GitHub
commit e921ce06b4
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23

View file

@ -33,6 +33,10 @@ use usb_device::{class_prelude::*, prelude::*};
// USB Communications Class Device support
use usbd_serial::SerialPort;
// Used to demonstrate writing formatted strings
use core::fmt::Write;
use heapless::String;
/// Entry point to our bare-metal application.
///
/// The `#[entry]` macro ensures the Cortex-M start-up code calls this function
@ -101,6 +105,16 @@ fn main() -> ! {
if !said_hello && timer.get_counter().ticks() >= 2_000_000 {
said_hello = true;
let _ = serial.write(b"Hello, World!\r\n");
let time = timer.get_counter().ticks();
let mut text: String<64> = String::new();
writeln!(&mut text, "Current timer ticks: {}", time).unwrap();
// This only works reliably because the number of bytes written to
// the serial port is smaller than the buffers available to the USB
// peripheral. In general, the return value should be handled, so that
// bytes not transferred yet don't get lost.
let _ = serial.write(text.as_bytes());
}
// Check for new data