diff --git a/src/args.rs b/src/args.rs
index 12d797e..c23346e 100644
--- a/src/args.rs
+++ b/src/args.rs
@@ -57,6 +57,10 @@ pub struct ArgWrite {
 	#[argp(description = "Path to the source Intel HEX file.")]
 	pub path: OsString,
 
+	#[argp(option)]
+	#[argp(description = "Where to run the command. Will be created if it doesn't exist.")]
+	pub cmd_path: Option<std::path::PathBuf>,
+
 	#[argp(option)]
 	#[argp(description = "Command to run before writing the file. Handy for compiling the program and running it at the same time.")]
 	pub cmd: Option<OsString>,
@@ -102,7 +106,7 @@ pub struct ArgMonitor {}
 pub struct ArgRun {
 	#[argp(positional)]
 	#[argp(description = "Path to the source C file.")]
-	pub path: OsString
+	pub path: std::path::PathBuf
 }
 
 #[derive(FromArgs)]
diff --git a/src/main.rs b/src/main.rs
index 5a01d89..48feeb9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -204,16 +204,23 @@ fn write_chip_data(args: &ArgWrite, target: &mut PhysicalTarget) -> Result<(), E
 fn write_chip(args: ArgWrite, target: &mut PhysicalTarget) -> Result<(), Error> {
 	loop {
 		if let Some(cmd) = args.cmd.as_ref() {
+			let cmd_path = &args.cmd_path;
 			let mut args = shlex::bytes::split(cmd.as_encoded_bytes())
 				.ok_or(Error::other("Error parsing commandline arguments"))?
 				.into_iter()
 				.map(|x| unsafe { OsString::from_encoded_bytes_unchecked(x) });
 
+			if let Some(cmd_path) = cmd_path {
+				if !cmd_path.is_dir() {
+					Err(Error::other("invalid cmd path (not a dir)"))?
+				}
+			}
 			let Some(name) = args.next() else {
 				Err(Error::other("No command provided"))?
 			};
 
 			let out = std::process::Command::new(name)
+				.current_dir(cmd_path.as_ref().map(|p| p.as_path()).unwrap_or(&std::path::Path::new(".")))
 				.args(args)
 				.output()?;
 
@@ -257,11 +264,21 @@ fn monitor_chip(_args: ArgMonitor, target: &mut PhysicalTarget) -> Result<(), Er
 }
 
 fn run_chip(args: ArgRun, target: &mut PhysicalTarget) -> Result<(), Error> {
-	let path = PathBuf::from(&args.path).with_extension("ihx").into_os_string();
-	let cmd = Some(OsString::from(format!("sdcc \"{}\"", unsafe { String::from_utf8_unchecked(args.path.into_encoded_bytes()) })));
+	let build_dir = args.path.parent().unwrap().join("tulflash");
+
+	let source_file_name = args.path.file_name().ok_or(Error::other("invalid path to compilation source"))?;
+	let source_file = build_dir.join(&source_file_name);
+	let output_file = source_file.with_extension("ihx");
+
+	let cmd = Some(OsString::from(format!("sdcc \"{}\"", source_file_name.to_string_lossy())));
+	let cmd_path = Some(build_dir.clone());
+
+	std::fs::create_dir_all(build_dir)?;
+	std::fs::copy(args.path, &source_file)?;
 
 	write_chip(ArgWrite {
-		path,
+		path: output_file.into_os_string(),
+		cmd_path,
 		cmd,
 		start: 0,
 		end: 65535,