From 6695bf0f21065960d6e83f2248fc6ad9a8ffa528 Mon Sep 17 00:00:00 2001
From: Timo Kröger <timokroeger93@gmail.com>
Date: Wed, 23 Dec 2020 16:18:29 +0100
Subject: Low power UART driver

---
 examples/src/bin/buffered_uart.rs | 84 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 examples/src/bin/buffered_uart.rs

(limited to 'examples/src/bin/buffered_uart.rs')

diff --git a/examples/src/bin/buffered_uart.rs b/examples/src/bin/buffered_uart.rs
new file mode 100644
index 000000000..6e15fbcfa
--- /dev/null
+++ b/examples/src/bin/buffered_uart.rs
@@ -0,0 +1,84 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::*;
+
+use cortex_m_rt::entry;
+use defmt::panic;
+use futures::pin_mut;
+use nrf52840_hal::gpio;
+
+use embassy::executor::{task, Executor};
+use embassy::io::{AsyncBufRead, AsyncBufReadExt, AsyncWrite, AsyncWriteExt};
+use embassy::util::Forever;
+use embassy_nrf::buffered_uarte;
+use embassy_nrf::interrupt;
+
+#[task]
+async fn run() {
+    let p = unwrap!(embassy_nrf::pac::Peripherals::take());
+
+    let port0 = gpio::p0::Parts::new(p.P0);
+
+    let pins = buffered_uarte::Pins {
+        rxd: port0.p0_08.into_floating_input().degrade(),
+        txd: port0
+            .p0_06
+            .into_push_pull_output(gpio::Level::Low)
+            .degrade(),
+        cts: None,
+        rts: None,
+    };
+
+    let irq = interrupt::take!(UARTE0_UART0);
+    let u = buffered_uarte::BufferedUarte::new(
+        p.UARTE0,
+        irq,
+        pins,
+        buffered_uarte::Parity::EXCLUDED,
+        buffered_uarte::Baudrate::BAUD115200,
+    );
+    pin_mut!(u);
+
+    info!("uarte initialized!");
+
+    unwrap!(u.write_all(b"Hello!\r\n").await);
+    info!("wrote hello in uart!");
+
+    // Simple demo, reading 8-char chunks and echoing them back reversed.
+    loop {
+        info!("reading...");
+        let mut buf = [0u8; 8];
+        unwrap!(u.read_exact(&mut buf).await);
+        info!("read done, got {:[u8]}", buf);
+
+        // Reverse buf
+        for i in 0..4 {
+            let tmp = buf[i];
+            buf[i] = buf[7 - i];
+            buf[7 - i] = tmp;
+        }
+
+        info!("writing...");
+        unwrap!(u.write_all(&buf).await);
+        info!("write done");
+    }
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let executor = EXECUTOR.put(Executor::new(cortex_m::asm::sev));
+    unwrap!(executor.spawn(run()));
+
+    loop {
+        executor.run();
+        cortex_m::asm::wfe();
+    }
+}
-- 
cgit