diff --git a/flake.nix b/flake.nix
index 5c96c60..0078156 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,6 +6,10 @@
   outputs = { self, nixpkgs }: let
     system = "x86_64-linux";
     pkgs = import nixpkgs { inherit system; };
+    rust = pkgs.rust-bin.stable.latest.default.override {
+      targets = [ "thumbv8m.main-none-eabihf" ];
+      extensions = [ "rust-src" "rustfmt" "clippy" ];
+    };
   in {
     devShells.${system}.default = pkgs.mkShell {
       packages = with pkgs; [
@@ -34,25 +38,28 @@
       ];
 
       shellHook = ''
-        # Set up Rust target
-        rustup target add thumbv7em-none-eabihf 2>/dev/null || true
+        echo ">>> STM32 DevShell"
 
-        # Ensure probe-rs binary is in PATH
-        if ! command -v probe-rs >/dev/null; then
-          echo "⚠️ probe-rs not found! (check nix installation)"
-        fi
+	export PATH=${pkgs.rust-analyzer}/bin:$PATH
+	export PATH=$HOME/.cargo/bin:$PATH
 
-        export RUST_TARGET=thumbv7em-none-eabihf
+        rustup default stable
+        rustup component add rust-src rustfmt clippy 2>/dev/null || true
+        rustup target add thumbv8m.main-none-eabihf 2>/dev/null || true
+
+        export RUST_TARGET=thumbv8m.main-none-eabihf
         export CARGO_TARGET_DIR=target
+	export DEFMT_LOG=info
         export PATH=$PATH:${pkgs.gcc-arm-embedded}/bin
+        export RUST_SRC_PATH="$(rustc --print sysroot)/lib/rustlib/src/rust/library"
 
 	rustc --version
 	arm-none-eabi-gcc --version | head -n1
         echo "cargo build --release --target thumbv8m.main-none-eabihf"
         echo "cargo flash --release --chip STM32U575ZI"
-	echo "export DEFMT_LOG=info"
 	echo "cargo run --bin main"
 	echo "probe-rs run --chip STM32U575ZITxQ target/thumbv8m.main-none-eabihf/release/main"
+	echo "target/**/build/embassy-stm32-*/out/_generated.rs"
       '';
     };
   };
diff --git a/hal_adc/openocd-u5.cfg b/hal_adc/openocd-u5.cfg
deleted file mode 100644
index 5ac6db7..0000000
--- a/hal_adc/openocd-u5.cfg
+++ /dev/null
@@ -1,4 +0,0 @@
-source [find interface/stlink.cfg]
-transport select hla_swd
-source [find target/stm32u5x.cfg]
-reset_config srst_only srst_nogate connect_assert_srst
diff --git a/hal_adc/rust-toolchain.toml b/hal_adc/rust-toolchain.toml
new file mode 100644
index 0000000..3ab7c52
--- /dev/null
+++ b/hal_adc/rust-toolchain.toml
@@ -0,0 +1,5 @@
+# rust-toolchain.toml
+[toolchain]
+channel = "stable"
+components = ["rust-src", "rustfmt", "clippy"]
+targets = ["thumbv8m.main-none-eabihf"]
diff --git a/hal_adc/src/bin/main.rs b/hal_adc/src/bin/main.rs
index 2a4c3c9..0f0aad2 100644
--- a/hal_adc/src/bin/main.rs
+++ b/hal_adc/src/bin/main.rs
@@ -23,6 +23,15 @@ async fn main(_spawner: embassy_executor::Spawner) {
     adc1.set_sample_time(adc::SampleTime::CYCLES160_5);
     let max1 = adc::resolution_to_max_count(adc::Resolution::BITS14);
 
+    // **** ADC2 init ****
+    let mut adc2 = adc::Adc::new(p.ADC2);
+    let mut adc2_pin1 = p.PC3; // A2
+    let mut adc2_pin2 = p.PB0; // A3
+    adc2.set_resolution(adc::Resolution::BITS14);
+    adc2.set_averaging(adc::Averaging::Samples1024);
+    adc2.set_sample_time(adc::SampleTime::CYCLES160_5);
+    let max2 = adc::resolution_to_max_count(adc::Resolution::BITS14);
+
     // **** ADC4 init ****
     let mut adc4 = adc4::Adc4::new(p.ADC4);
     let mut adc4_pin1 = p.PC1; // A4
@@ -41,6 +50,15 @@ async fn main(_spawner: embassy_executor::Spawner) {
     let volt: f32 = 3.3 * raw as f32 / max1 as f32;
     info!("Read adc1 pin 2 {}", volt);
 
+    // **** ADC2 blocking read ****
+    let raw: u16 = adc2.blocking_read(&mut adc2_pin1);
+    let volt: f32 = 3.3 * raw as f32 / max2 as f32;
+    info!("Read adc2 pin 1 {}", volt);
+
+    let raw: u16 = adc2.blocking_read(&mut adc2_pin2);
+    let volt: f32 = 3.3 * raw as f32 / max2 as f32;
+    info!("Read adc2 pin 2 {}", volt);
+
     // **** ADC4 blocking read ****
     let raw: u16 = adc4.blocking_read(&mut adc4_pin1);
     let volt: f32 = 3.3 * raw as f32 / max4 as f32;