now using println, deny warnings

.vscode/tasks.json

@@ -25,11 +25,7 @@
             "command": "xargo build --example gpio",
             "problemMatcher": [
                 "$rustc"
-            ],
-            "group": {
-                "kind": "build",
-                "isDefault": true
-            }
+            ]
         },
         {
             "taskName": "xargo build --example usart1",
@@ -37,7 +33,11 @@
             "command": "xargo build --example usart1",
             "problemMatcher": [
                 "$rustc"
-            ]
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
         },
         {
             "type": "shell",

examples/hello.rs

@@ -5,13 +5,10 @@
 #![no_std]
 
 extern crate cortex_m_rtfm as rtfm;
-extern crate cortex_m_semihosting as semihosting;
+#[macro_use]
 extern crate nucleo_64;
 
-use core::fmt::Write;
-
 use rtfm::app;
-use semihosting::hio;
 
 app! {
     device: nucleo_64::stm32f40x,
@@ -20,8 +17,9 @@ app! {
 fn init(_p: init::Peripherals) {}
 
 fn idle() -> ! {
-    writeln!(hio::hstdout().unwrap(), "Hello, Sworld!").unwrap();
+    println!("Hello, world!");
 
+    rtfm::bkpt();
     loop {
         rtfm::wfi();
     }

examples/usart1.rs

@@ -4,8 +4,8 @@
 //!
 //! PA2 (TX), PA3(RX) on the MCU is connected to the pin header CN3
 //#![deny(unsafe_code)]
-//#![deny(warnings)]
-#![allow(warnings)]
+#![deny(warnings)]
+//#![allow(warnings)]
 #![feature(proc_macro)]
 #![no_std]
 
@@ -13,16 +13,13 @@ extern crate cortex_m_rtfm as rtfm;
 extern crate cortex_m_semihosting as semihosting;
 #[macro_use]
 extern crate nb;
+#[macro_use]
 extern crate nucleo_64;
 extern crate stm32f40x;
 
-//use nucleo_64::Serial;
-use nucleo_64::prelude::*;
 use nucleo_64::time::Hertz;
-use semihosting::hio;
-use core::fmt::Write;
+
 use rtfm::app;
-use core::ops::Deref;
 use core::ptr;
 use nucleo_64::apb1;
 
@@ -32,12 +29,12 @@ app! {
     device: nucleo_64::stm32f40x,
 }
 
-use stm32f40x::{gpioa, DMA1, USART1, USART2, USART3, usart6, GPIOA, GPIOB, RCC};
+use stm32f40x::USART2;
 
 
 #[inline(never)]
 fn init(p: init::Peripherals) {
-    writeln!(hio::hstdout().unwrap(), "Init!").unwrap();
+    println!("Init!");
     // RM0368 6.3.9
     // enable clock to GPIOA, USART2
     p.RCC.ahb1enr.modify(|_, w| w.gpioaen().enable());
@@ -59,7 +56,6 @@ fn init(p: init::Peripherals) {
             .variant(stm32f40x::gpioa::moder::MODER15W::ALTERNATEMODE)
     });
 
-
     // we don't care about the speed register atm
     // DM00102166
     // AF7, Table 9
@@ -106,34 +102,10 @@ fn init(p: init::Peripherals) {
             .clear_bit()
     });
 
-    // let serial = Serial(p.USART1);
-
-    // serial.init(BAUD_RATE.invert(), p.AFIO, None, p.GPIOA, p.RCC);
-
-    // echo incoming
     loop {
         let b = block!(read(p.USART2)).unwrap();
         write(p.USART2, b).unwrap();
     }
-
-
-
-
-    const BYTE: u8 = b'A';
-
-    assert!(write(p.USART2, BYTE).is_ok());
-
-    for _ in 0..1_000 {
-        match read(p.USART2) {
-            Ok(byte) => {
-                assert_eq!(byte, BYTE);
-                return;
-            }
-            Err(nb::Error::Other(e)) => panic!("{:?}", e),
-            Err(nb::Error::WouldBlock) => continue,
-        }
-    }
-    panic!("Timeout")
 }
 
 // Specialized `Result` type
@@ -190,7 +162,7 @@ fn read(usart2: &USART2) -> Result<u8> {
 }
 
 fn idle() -> ! {
-    // OK
+    // Will never be hit, as
     rtfm::bkpt();
 
     // Sleep

src/gpio.rs

@@ -2,7 +2,7 @@
 //!
 //! - PA0 - PA15
 
-use stm32f40x::{GPIOA, RCC};
+use stm32f40x::GPIOA;
 use stm32f40x;
 
 macro_rules! pin {

src/lib.rs

@@ -11,7 +11,7 @@
 //! [i]: https://docs.rs/cortex-m-quickstart/0.1.8/cortex_m_quickstart/
 
 #![deny(missing_docs)]
-//#![deny(warnings)]
+#![deny(warnings)]
 #![allow(warnings)]
 #![feature(const_cell_new)]
 #![feature(const_fn)]