6 files changed, 178 insertions, 5 deletions
diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index 8cc4763..25c8c84 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -14,3 +14,4 @@ else()
 endif()
 
 add_subdirectory(encrypt)
+add_subdirectory(controller)
diff --git a/app/controller/CMakeLists.txt b/app/controller/CMakeLists.txt
new file mode 100644
index 0000000..27137e5
--- /dev/null
+++ b/app/controller/CMakeLists.txt
@@ -0,0 +1,14 @@
+add_executable(nes_app_controller)
+
+target_include_directories(nes_app_controller PRIVATE .)
+target_link_libraries(
+	nes_app_controller
+	PRIVATE
+		nes::options
+		nes::nes)
+
+target_sources(
+	nes_app_controller
+	PRIVATE
+		main.cc
+		serial-controller.cc)
diff --git a/app/controller/main.cc b/app/controller/main.cc
new file mode 100644
index 0000000..a9ea5bd
--- /dev/null
+++ b/app/controller/main.cc
@@ -0,0 +1,33 @@
+#include <iostream>
+#include <cstdlib>
+#include <thread>
+#include "serial-controller.hh"
+
+int main(int argc, char** argv)
+{
+    if (argc != 2)
+    {
+        std::cerr << "Usage:\n";
+		std::cerr << "  " << argv[0] << " <controller-path>" << std::endl;
+		return EXIT_FAILURE;
+    }
+
+    auto const path = argv[1];
+    auto controller = nes::app::test::serial_controller{ path };
+    if (!controller.is_reliable())
+    {
+        return EXIT_FAILURE;
+    }
+
+    while (true)
+    {
+        auto const buttons = controller.read_buttons();
+        if (!buttons.is_empty())
+        {
+            std::cout << "Buttons: " << buttons.get_raw_value() << std::endl;
+        }
+        std::this_thread::sleep_for(std::chrono::milliseconds(20));
+    }
+
+    return EXIT_SUCCESS;
+}
diff --git a/app/controller/serial-controller.cc b/app/controller/serial-controller.cc
new file mode 100644
index 0000000..8485ec4
--- /dev/null
+++ b/app/controller/serial-controller.cc
@@ -0,0 +1,96 @@
+#include "serial-controller.hh"
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+namespace nes::app::test
+{
+	serial_controller::serial_controller(char const* path)
+		: path_{ path }
+	{
+		fd_ = open(path, O_RDONLY | O_NOCTTY | O_NDELAY | O_NONBLOCK);
+		if (fd_ == -1)
+		{
+			perror("serial_controller: open");
+			return;
+		}
+
+		if (!set_up()) { close(); }
+	}
+
+	serial_controller::~serial_controller()
+	{
+		close();
+	}
+
+	auto serial_controller::is_reliable() const -> bool
+	{
+		return fd_ != -1;
+	}
+
+	auto serial_controller::read_buttons() -> sys::button_mask
+	{
+		if (fd_ == -1) { return sys::button_mask{}; }
+
+		// Poll for any updates until we can't read anymore.
+		while (true)
+		{
+			auto buf = u8{};
+			auto const res = read(fd_, &buf, 1);
+			if (res == -1)
+			{
+				if (errno == EAGAIN || errno == EWOULDBLOCK) { break; }
+
+				perror("read from controller");
+				close();
+				break;
+			}
+
+			current_ = sys::button_mask::from_raw_value(buf);
+		}
+
+		return current_;
+	}
+
+
+	auto serial_controller::set_up() -> bool
+	{
+		if (ioctl(fd_, TIOCEXCL) == -1)
+		{
+			perror("serial_controller: ioctl");
+			return false;
+		}
+
+		auto attr = termios{};
+		if (tcgetattr(fd_, &attr) == -1)
+		{
+			perror("serial_controller: tcgetattr");
+			return false;
+		}
+
+		cfsetispeed(&attr, B57600);
+		cfsetospeed(&attr, B57600);
+		attr.c_cflag = attr.c_cflag | CLOCAL | CREAD;
+		attr.c_cflag = (attr.c_cflag & static_cast<tcflag_t>(~CSIZE)) | CS8;
+
+		if (tcsetattr(fd_, TCSANOW, &attr) == -1)
+		{
+			perror("serial_controller: tcsetattr");
+			return false;
+		}
+
+		return true;
+	}
+
+	auto serial_controller::close() -> void
+	{
+		if (fd_ != -1)
+		{
+			::close(fd_);
+			fd_ = -1;
+		}
+	}
+} // namespace nes::app::mac
diff --git a/app/controller/serial-controller.hh b/app/controller/serial-controller.hh
new file mode 100644
index 0000000..bc217b0
--- /dev/null
+++ b/app/controller/serial-controller.hh
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "nes/app/input/input-device-controller.hh"
+
+namespace nes::app::test
+{
+	/// Input device for an NES controller plugged in via serial port.
+	class serial_controller final : public input_device_controller
+	{
+		char const* path_;
+		int fd_{ -1 };
+		sys::button_mask current_{};
+		index index_{ index::unused };
+
+	public:
+		explicit serial_controller(char const* path);
+		~serial_controller() override;
+
+		auto is_reliable() const -> bool override;
+		auto get_name() const -> string_view override { return path_; }
+		auto get_index() const -> index override { return index_; }
+		auto set_index(index const v) -> void override { index_ = v; }
+		auto read_buttons() -> sys::button_mask override;
+
+	private:
+		auto set_up() -> bool;
+		auto close() -> void;
+	};
+} // namespace nes::app:mac
diff --git a/app/encrypt/CMakeLists.txt b/app/encrypt/CMakeLists.txt
index 5da53af..d147284 100644
--- a/app/encrypt/CMakeLists.txt
+++ b/app/encrypt/CMakeLists.txt
@@ -1,13 +1,13 @@
-add_executable(nes_app_test)
+add_executable(nes_app_encrypt)
 
-target_include_directories(nes_app_test PRIVATE .)
+target_include_directories(nes_app_encrypt PRIVATE .)
 target_link_libraries(
-	nes_app_test
+	nes_app_encrypt
 	PRIVATE
 		nes::options
 		nes::nes)
 
 target_sources(
-	nes_app_test
+	nes_app_encrypt
 	PRIVATE
-		main.cc)
-\ No newline at end of file
+		main.cc)