Add defmt

Author: Henrik Snöman

.cargo/config.toml

@@ -3,6 +3,7 @@ runner = 'probe-rs run --connect-under-reset'
 rustflags = [
   # LLD (shipped with the Rust toolchain) is used as the default linker
   "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
 ]
 
 [build]

Cargo.toml

@@ -68,6 +68,7 @@ log = { version = "0.4.20", optional = true}
 [dev-dependencies]
 log = { version = "0.4.20"}
 cortex-m-rt = "0.7.3"
+defmt-rtt = { version = "0.4.0" }
 panic-halt = "0.2.0"
 panic-rtt-target = { version = "0.1.0", features = ["cortex-m"] }
 cfg-if = "1.0.0"
@@ -76,6 +77,7 @@ lazy_static = { version = "1.4.0", features = ["spin_no_std"] }
 cortex-m-log = { version = "0.8.0", features = ["itm", "semihosting", "log-integration"] }
 cortex-m-semihosting = "0.5.0"
 panic-itm = { version = "~0.4.1" }
+panic-probe = "0.3.2"
 panic-semihosting = "0.6"
 
 [profile.release]
@@ -86,7 +88,6 @@ opt-level = "s" # optimize for binary size
 
 [[example]]
 name = "blinky"
-required-features = ["stm32h503"]
 
 [[example]]
 name = "i2c"

examples/blinky.rs

@@ -8,6 +8,7 @@ use cortex_m_rt::entry;
 use embedded_hal::delay::DelayNs;
 use fugit::SecsDurationU32;
 use stm32h5xx_hal::{delay::Delay, pac, prelude::*};
+use utilities::logger::info;
 
 #[entry]
 fn main() -> ! {
@@ -31,10 +32,10 @@ fn main() -> ! {
 
     loop {
         led.set_low();
-        log::info!("Off");
+        info!("Off");
         delay.delay_ms(duration);
         led.set_high();
-        log::info!("On");
+        info!("On");
         delay.delay_ms(duration);
     }
 }

examples/utilities/logger.rs

@@ -1,5 +1,16 @@
 #![cfg_attr(feature = "log-itm", allow(unsafe_code))]
 
+cfg_if::cfg_if! {
+    if #[cfg(feature = "defmt")] {
+        #[allow(unused_imports)]
+        pub use defmt::{info, trace, warn, debug, error};
+
+    } else {
+        #[allow(unused_imports)]
+        pub use log::{info, trace, warn, debug, error};
+    }
+}
+
 cfg_if::cfg_if! {
     if #[cfg(any(feature = "log-itm"))] {
         use panic_itm as _;
@@ -32,6 +43,17 @@ cfg_if::cfg_if! {
         }
 
     }
+    else if #[cfg(feature = "defmt")] {
+        use defmt_rtt as _; // global logger
+        use panic_probe as _;
+        #[allow(unused_imports)]
+        pub use defmt::Logger;
+        #[allow(unused_imports)]
+        pub use defmt::println;
+
+        #[allow(dead_code)]
+        pub fn init() {}
+    }
     else if #[cfg(any(feature = "log-rtt"))] {
         use panic_rtt_target as _;