squash all warnings, add RTT support

Cargo.lock

@@ -264,6 +264,7 @@ dependencies = [
  "nb 1.0.0",
  "num-traits",
  "panic-halt",
+ "rtt-target",
  "smoltcp",
  "stm32-eth",
  "stm32f4xx-hal",
@@ -368,6 +369,16 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 
+[[package]]
+name = "rtt-target"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "065d6058bb1204f51a562a67209e1817cf714759d5cf845aa45c75fa7b0b9d9b"
+dependencies = [
+ "cortex-m 0.7.6",
+ "ufmt-write",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -496,6 +507,12 @@ version = "1.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dcf81ac59edc17cc8697ff311e8f5ef2d99fcbd9817b34cec66f90b6c3dfd987"
 
+[[package]]
+name = "ufmt-write"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e87a2ed6b42ec5e28cc3b94c09982969e9227600b2e3dcbc1db927a84c06bd69"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.5"

Cargo.toml

@@ -29,10 +29,12 @@ num-traits = { version = "0.2.15", default-features = false, features = ["libm"]
 usb-device = "0.2.9"
 usbd-serial = "0.1.1"
 fugit = "0.3.6"
+rtt-target = { version = "0.3.1", features = ["cortex-m"] }
 
 
 [features]
 semihosting = ["cortex-m-log/semihosting"]
+RTT = []
 
 [profile.release]
 codegen-units = 1

src/device/boot.rs

@@ -34,7 +34,7 @@ pub fn bootup(mut core_perif: CorePeripherals, perif: Peripherals) -> Independen
 
     sys_timer::setup(core_perif.SYST, clocks);
 
-    let (eth_pins, usb, current_source_phy) = gpio::setup(
+    let (_eth_pins, usb, current_source_phy) = gpio::setup(
         clocks,
         perif.GPIOA,
         perif.GPIOB,
@@ -57,7 +57,7 @@ pub fn bootup(mut core_perif: CorePeripherals, perif: Peripherals) -> Independen
     };
 
     laser.setup();
-    laser.set_current(0.1);
+    laser.set_current(0.1).unwrap();
 
     let mut wd = IndependentWatchdog::new(perif.IWDG);
     wd.start(WATCHDOG_PERIOD.millis());

src/device/log_setup.rs

@@ -1,13 +1,21 @@
-#[cfg(not(feature = "semihosting"))]
-use super::usb;
-
-#[cfg(not(feature = "semihosting"))]
+#[cfg(not(any(feature = "semihosting", feature = "RTT")))]
 pub fn init_log() {
+    use super::usb;
     static USB_LOGGER: usb::Logger = usb::Logger;
     let _ = log::set_logger(&USB_LOGGER);
     log::set_max_level(log::LevelFilter::Debug);
 }
 
+#[cfg(feature = "RTT")]
+pub fn init_log() {
+    use super::rtt_logger;
+    use rtt_target::rtt_init_print;
+    static RTT_LOGGER: rtt_logger::Logger = rtt_logger::Logger;
+    rtt_init_print!();
+    let _ = log::set_logger(&RTT_LOGGER);
+    log::set_max_level(log::LevelFilter::Debug);
+}
+
 #[cfg(feature = "semihosting")]
 pub fn init_log() {
     use cortex_m_log::log::{init, Logger};

src/device/mod.rs

@@ -1,5 +1,6 @@
 pub mod boot;
 pub mod gpio;
 pub mod log_setup;
+pub mod rtt_logger;
 pub mod sys_timer;
 pub mod usb;

src/device/rtt_logger.rs

@@ -0,0 +1,18 @@
+use log::{Log, Metadata, Record};
+use rtt_target::rprintln;
+
+pub struct Logger;
+
+impl Log for Logger {
+    fn enabled(&self, _: &Metadata) -> bool {
+        true
+    }
+
+    fn log(&self, record: &Record) {
+        if self.enabled(record.metadata()) {
+            rprintln!("{} - {}", record.level(), record.args());
+        }
+    }
+
+    fn flush(&self) {}
+}