1 files changed, 53 insertions, 0 deletions

diff --git a/tests/utils/src/bin/saturate_serial.rs b/tests/utils/src/bin/saturate_serial.rs
new file mode 100644
index 000000000..18ca12fb7
--- /dev/null
+++ b/tests/utils/src/bin/saturate_serial.rs
@@ -0,0 +1,53 @@
+use std::path::Path;
+use std::time::Duration;
+use std::{env, io, process, thread};
+
+use rand::random;
+use serial::SerialPort;
+
+pub fn main() {
+    if let Some(port_name) = env::args().nth(1) {
+        let idles = env::args().position(|x| x == "--idles").is_some();
+
+        println!("Saturating port {:?} with 115200 8N1", port_name);
+        println!("Idles: {}", idles);
+        println!("Process ID: {}", process::id());
+        let mut port = serial::open(&port_name).unwrap();
+        if saturate(&mut port, idles).is_err() {
+            eprintln!("Unable to saturate port");
+        }
+    } else {
+        let path = env::args().next().unwrap();
+        let basepath = Path::new(&path).with_extension("");
+        let basename = basepath.file_name().unwrap();
+        eprintln!("USAGE: {} <port-name>", basename.to_string_lossy());
+    }
+}
+
+fn saturate<T: SerialPort>(port: &mut T, idles: bool) -> io::Result<()> {
+    port.reconfigure(&|settings| {
+        settings.set_baud_rate(serial::Baud115200)?;
+        settings.set_char_size(serial::Bits8);
+        settings.set_parity(serial::ParityNone);
+        settings.set_stop_bits(serial::Stop1);
+        Ok(())
+    })?;
+
+    let mut written = 0;
+    loop {
+        let len = random::<usize>() % 0x1000;
+        let buf: Vec<u8> = (written..written + len).map(|x| x as u8).collect();
+
+        port.write_all(&buf)?;
+
+        if idles {
+            let micros = (random::<usize>() % 1000) as u64;
+            println!("Sleeping {}us", micros);
+            port.flush().unwrap();
+            thread::sleep(Duration::from_micros(micros));
+        }
+
+        written += len;
+        println!("Written: {}", written);
+    }
+}