diff --git a/semestralka_2/.cargo/config.toml b/semestralka_2/.cargo/config.toml
index ac6a5dc..e4cb341 100644
--- a/semestralka_2/.cargo/config.toml
+++ b/semestralka_2/.cargo/config.toml
@@ -13,3 +13,7 @@ rustflags = [
 
 [package.metadata.cargo-flash]
 chip = "STM32U575ZIT"
+
+[env]
+CC_thumbv8m_main_none_eabihf = "arm-none-eabi-gcc"
+AR_thumbv8m_main_none_eabihf = "arm-none-eabi-ar"
diff --git a/semestralka_2/Cargo.lock b/semestralka_2/Cargo.lock
index 0556be2..b9fc8c5 100644
--- a/semestralka_2/Cargo.lock
+++ b/semestralka_2/Cargo.lock
@@ -109,9 +109,9 @@ checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "cc"
-version = "1.2.44"
+version = "1.2.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37521ac7aabe3d13122dc382493e20c9416f299d2ccd5b3a5340a2570cdeb0f3"
+checksum = "c481bdbf0ed3b892f6f806287d72acd515b352a4ec27a208489b8c1bc839633a"
 dependencies = [
  "find-msvc-tools",
  "shlex",
@@ -294,6 +294,7 @@ dependencies = [
 name = "dma_gpio"
 version = "0.1.0"
 dependencies = [
+ "cc",
  "cortex-m",
  "cortex-m-rt",
  "defmt 1.0.1",
@@ -648,9 +649,9 @@ checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
 
 [[package]]
 name = "find-msvc-tools"
-version = "0.1.4"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
+checksum = "3a3076410a55c90011c298b04d0cfa770b00fa04e1e3c97d3f6c9de105a03844"
 
 [[package]]
 name = "float-cmp"
diff --git a/semestralka_2/Cargo.toml b/semestralka_2/Cargo.toml
index 8a6d4b1..f57b237 100644
--- a/semestralka_2/Cargo.toml
+++ b/semestralka_2/Cargo.toml
@@ -1,5 +1,5 @@
-[package]
-authors = ["Priec <filippriec@gmail.com>"]
+[package] 
+authors = ["Priec <filippriec@gmail.com>"] 
 name = "dma_gpio"
 edition = "2024"
 version = "0.1.0"
@@ -33,6 +33,9 @@ embedded-io-async = "0.6.1"
 [dev-dependencies]
 defmt-test = "0.4.0"
 
+[build-dependencies]
+cc = "1.2.48"
+
 [[test]]
 name = "uart_emulation"
 harness = false
diff --git a/semestralka_2/build.rs b/semestralka_2/build.rs
new file mode 100644
index 0000000..ba9dd9a
--- /dev/null
+++ b/semestralka_2/build.rs
@@ -0,0 +1,51 @@
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let cube_path = PathBuf::from("/home/priec/programs/STM32CubeU5");
+
+    let hal_driver = cube_path.join("Drivers/STM32U5xx_HAL_Driver");
+    let cmsis = cube_path.join("Drivers/CMSIS");
+    let device = cmsis.join("Device/ST/STM32U5xx");
+
+    let example_inc = cube_path.join("Projects/NUCLEO-U575ZI-Q/Examples/GPIO/GPIO_IOToggle/Inc");
+
+    let hal_srcs = [
+        "stm32u5xx_hal.c",
+        "stm32u5xx_hal_rcc.c",
+        "stm32u5xx_hal_rcc_ex.c",
+        "stm32u5xx_hal_pwr.c",
+        "stm32u5xx_hal_pwr_ex.c",
+        "stm32u5xx_hal_gpio.c",
+        "stm32u5xx_hal_cortex.c",
+        "stm32u5xx_hal_flash.c",
+        "stm32u5xx_hal_flash_ex.c",
+        "stm32u5xx_hal_icache.c",
+        "stm32u5xx_hal_ramcfg.c",
+        "stm32u5xx_hal_rtc.c",
+        "stm32u5xx_hal_rtc_ex.c",
+    ];
+
+    let mut build = cc::Build::new();
+    for src in hal_srcs {
+        build.file(hal_driver.join("Src").join(src));
+    }
+
+    build
+        .include(hal_driver.join("Inc"))
+        .include(device.join("Include"))
+        .include(cmsis.join("Core/Include"))
+        .include(&example_inc)
+        .define("USE_HAL_DRIVER", None)
+        .define("STM32U575xx", None)
+        // flags
+        .flag("-mthumb")
+        .flag("-march=armv8-m.main+fp.dp")
+        .flag("-mfloat-abi=hard")
+        .warnings(false)
+        .compile("stm32u5_hal");
+
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed={}", hal_driver.display());
+    println!("cargo:rerun-if-changed={}", example_inc.display());
+}