From 1d51f91368c4ba6b497cdfb5bca5b764d13074f9 Mon Sep 17 00:00:00 2001
From: Jacob Rosenthal <jacobrosenthal@gmail.com>
Date: Thu, 16 Dec 2021 14:59:35 -0700
Subject: [PATCH] usb_uart_io example equivilent to usb_uart

---
 examples/nrf/src/bin/usb_uart_io.rs | 70 +++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 examples/nrf/src/bin/usb_uart_io.rs

diff --git a/examples/nrf/src/bin/usb_uart_io.rs b/examples/nrf/src/bin/usb_uart_io.rs
new file mode 100644
index 00000000..f07ed891
--- /dev/null
+++ b/examples/nrf/src/bin/usb_uart_io.rs
@@ -0,0 +1,70 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use defmt::{info, unwrap};
+use defmt_rtt as _;
+// global logger
+use panic_probe as _; // print out panic messages
+
+use embassy::executor::Spawner;
+use embassy::interrupt::InterruptExt;
+use embassy::io::{read_line, AsyncWriteExt};
+use embassy_nrf::usb::{State, Usb, UsbBus, UsbSerial};
+use embassy_nrf::{interrupt, Peripherals};
+use futures::pin_mut;
+use usb_device::device::{UsbDeviceBuilder, UsbVidPid};
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    let mut rx_buffer = [0u8; 64];
+    // we send back input + cr + lf
+    let mut tx_buffer = [0u8; 66];
+
+    let usb_bus = UsbBus::new(p.USBD);
+
+    let serial = UsbSerial::new(&usb_bus, &mut rx_buffer, &mut tx_buffer);
+
+    let device = UsbDeviceBuilder::new(&usb_bus, UsbVidPid(0x16c0, 0x27dd))
+        .manufacturer("Fake company")
+        .product("Serial port")
+        .serial_number("TEST")
+        .device_class(0x02)
+        .build();
+
+    let irq = interrupt::take!(USBD);
+    irq.set_priority(interrupt::Priority::P3);
+
+    let mut state = State::new();
+    let usb = unsafe { Usb::new(&mut state, device, serial, irq) };
+    pin_mut!(usb);
+
+    let (mut reader, mut writer) = usb.as_ref().take_serial_0();
+
+    info!("usb initialized!");
+
+    unwrap!(
+        writer
+            .write_all(b"\r\nInput returned upper cased on CR+LF\r\n")
+            .await
+    );
+
+    let mut buf = [0u8; 64];
+    loop {
+        let n = unwrap!(read_line(&mut reader, &mut buf).await);
+
+        for char in buf[..n].iter_mut() {
+            // upper case
+            if 0x61 <= *char && *char <= 0x7a {
+                *char &= !0x20;
+            }
+        }
+
+        unwrap!(writer.write_all(&buf[..n]).await);
+        unwrap!(writer.write_all(b"\r\n").await);
+        unwrap!(writer.flush().await);
+    }
+}