diff --git a/.cargo/config.toml b/.cargo/config.toml
index 57084de..d2012bd 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,8 +1,9 @@
 [target.thumbv8m.main-none-eabihf]
-runner = 'arm-none-eabi-gdb'
+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]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 235cddf..a615547 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,8 +20,11 @@ jobs:
           - stm32h562
           - stm32h563
           - stm32h573
+        logger:
+          - log
+          - defmt
     env:                        # Peripheral Feature flags
-      FLAGS: rt,log
+      FLAGS: rt
 
     steps:
       - uses: actions/checkout@v4
@@ -42,6 +45,6 @@ jobs:
       - name: Install thumbv8m rust target
         run: rustup target add thumbv8m.main-none-eabihf
       - name: Build
-        run: cargo build --verbose --release --examples --target thumbv8m.main-none-eabihf --features ${{ matrix.mcu }},${{ env.FLAGS }}
+        run: cargo build --verbose --release --examples --target thumbv8m.main-none-eabihf --features ${{ matrix.mcu }},${{ matrix.logger }},${{ env.FLAGS }}
       - name: Test
-        run: cargo test --lib --target x86_64-unknown-linux-gnu --features ${{ matrix.mcu }},${{ env.FLAGS }}
+        run: cargo test --lib --target x86_64-unknown-linux-gnu --features ${{ matrix.mcu }},${{ matrix.logger }},${{ env.FLAGS }}
diff --git a/Cargo.toml b/Cargo.toml
index 65fea4b..24c3e0c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -61,13 +61,14 @@ cortex-m = { version = "^0.7.7", features = ["critical-section-single-core"] }
 stm32h5 = { package = "stm32h5", version = "0.16.0" }
 fugit = "0.3.7"
 embedded-hal = "1.0.0"
-defmt = { version = "0.3.8", optional = true }
+defmt = { version = "1.0.0", optional = true }
 paste = "1.0.15"
 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"
diff --git a/examples/blinky.rs b/examples/blinky.rs
index 142f462..c1cab03 100644
--- a/examples/blinky.rs
+++ b/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);
     }
 }
diff --git a/examples/utilities/logger.rs b/examples/utilities/logger.rs
index 400a9b3..e47f78b 100644
--- a/examples/utilities/logger.rs
+++ b/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 _;
 
diff --git a/src/gpio/dynamic.rs b/src/gpio/dynamic.rs
index 968a2f3..247a972 100644
--- a/src/gpio/dynamic.rs
+++ b/src/gpio/dynamic.rs
@@ -25,6 +25,7 @@ pub enum Dynamic {
 
 /// Error for [DynamicPin]
 #[derive(Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum PinModeError {
     /// For operations unsupported in current mode
     IncorrectMode,
diff --git a/src/rcc/pll.rs b/src/rcc/pll.rs
index 1c67be4..ee7a7e2 100644
--- a/src/rcc/pll.rs
+++ b/src/rcc/pll.rs
@@ -61,6 +61,7 @@ const VCO_RANGE_WIDE: VcoRange = VcoRange {
 };
 
 #[derive(Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 struct PllOutput {
     ck: u32,
     div: u32,