From ad8f32911cfaed11fb0638d73107988f5f3ac701 Mon Sep 17 00:00:00 2001
From: Filipriec <filippriec@gmail.com>
Date: Tue, 14 Apr 2026 14:41:10 +0200
Subject: [PATCH] project init

---
 semestralka/.cargo/config.toml | 17 ++++++++
 semestralka/.gitignore         |  1 +
 semestralka/Cargo.lock         |  7 +++
 semestralka/Cargo.toml         |  6 +++
 semestralka/build.rs           | 79 ++++++++++++++++++++++++++++++++++
 semestralka/src/main.rs        |  3 ++
 6 files changed, 113 insertions(+)
 create mode 100644 semestralka/.cargo/config.toml
 create mode 100644 semestralka/.gitignore
 create mode 100644 semestralka/Cargo.lock
 create mode 100644 semestralka/Cargo.toml
 create mode 100644 semestralka/build.rs
 create mode 100644 semestralka/src/main.rs

diff --git a/semestralka/.cargo/config.toml b/semestralka/.cargo/config.toml
new file mode 100644
index 0000000..a8791c1
--- /dev/null
+++ b/semestralka/.cargo/config.toml
@@ -0,0 +1,17 @@
+[target.xtensa-esp32-none-elf]
+runner = "espflash flash --monitor --chip esp32"
+
+[env]
+ESP_LOG="info"
+
+[build]
+rustflags = [
+  "-C", "link-arg=-nostartfiles",
+  "-C", "link-arg=-Tdefmt.x",
+  "-Z", "stack-protector=all",
+]
+
+target = "xtensa-esp32-none-elf"
+
+[unstable]
+build-std = ["alloc", "core"]
diff --git a/semestralka/.gitignore b/semestralka/.gitignore
new file mode 100644
index 0000000..2f7896d
--- /dev/null
+++ b/semestralka/.gitignore
@@ -0,0 +1 @@
+target/
diff --git a/semestralka/Cargo.lock b/semestralka/Cargo.lock
new file mode 100644
index 0000000..72080dc
--- /dev/null
+++ b/semestralka/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "semestralka"
+version = "0.1.0"
diff --git a/semestralka/Cargo.toml b/semestralka/Cargo.toml
new file mode 100644
index 0000000..4f2a452
--- /dev/null
+++ b/semestralka/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "semestralka"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/semestralka/build.rs b/semestralka/build.rs
new file mode 100644
index 0000000..0480dfb
--- /dev/null
+++ b/semestralka/build.rs
@@ -0,0 +1,79 @@
+fn main() {
+    // Explicitly load .env from the project root, even when called from other dirs
+    let project_root = std::env::var("CARGO_MANIFEST_DIR").unwrap();
+    let dotenv_path = std::path::Path::new(&project_root).join(".env");
+    if dotenvy::from_path(dotenv_path.clone()).is_ok() {
+        println!("cargo:rerun-if-changed={}", dotenv_path.display());
+    }
+
+    // Pass WIFI credentials into firmware
+    if let Ok(ssid) = std::env::var("SSID") {
+        println!("cargo:rustc-env=SSID={}", ssid);
+    }
+    if let Ok(password) = std::env::var("PASSWORD") {
+        println!("cargo:rustc-env=PASSWORD={}", password);
+    }
+    if let Ok(ip) = std::env::var("BROKER_IP") {
+        println!("cargo:rustc-env=BROKER_IP={}", ip);
+    }
+    if let Ok(port) = std::env::var("BROKER_PORT") {
+        println!("cargo:rustc-env=BROKER_PORT={}", port);
+    }
+
+    linker_be_nice();
+
+    println!("cargo:rustc-link-arg=-Tlinkall.x");
+}
+
+fn linker_be_nice() {
+    let args: Vec<String> = std::env::args().collect();
+    if args.len() > 1 {
+        let kind = &args[1];
+        let what = &args[2];
+
+        match kind.as_str() {
+            "undefined-symbol" => match what.as_str() {
+                "_defmt_timestamp" => {
+                    eprintln!();
+                    eprintln!(
+                        "💡 `defmt` not found - make sure `defmt.x` is added as a linker script and you have included `use defmt_rtt as _;`"
+                    );
+                    eprintln!();
+                }
+                "_stack_start" => {
+                    eprintln!();
+                    eprintln!("💡 Is the linker script `linkall.x` missing?");
+                    eprintln!();
+                }
+                "esp_wifi_preempt_enable"
+                | "esp_wifi_preempt_yield_task"
+                | "esp_wifi_preempt_task_create" => {
+                    eprintln!();
+                    eprintln!(
+                        "💡 `esp-wifi` has no scheduler enabled. Make sure you have the `builtin-scheduler` feature enabled, or that you provide an external scheduler."
+                    );
+                    eprintln!();
+                }
+                "embedded_test_linker_file_not_added_to_rustflags" => {
+                    eprintln!();
+                    eprintln!(
+                        "💡 `embedded-test` not found - make sure `embedded-test.x` is added as a linker script for tests"
+                    );
+                    eprintln!();
+                }
+                _ => (),
+            },
+            // we don't have anything helpful for "missing-lib" yet
+            _ => {
+                std::process::exit(1);
+            }
+        }
+
+        std::process::exit(0);
+    }
+
+    println!(
+        "cargo:rustc-link-arg=-Wl,--error-handling-script={}",
+        std::env::current_exe().unwrap().display()
+    );
+}
diff --git a/semestralka/src/main.rs b/semestralka/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/semestralka/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}