test new format

tty_protocol_writer.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+class TtyProtocolWriter {
+public:
+    explicit TtyProtocolWriter(std::string path);
+    ~TtyProtocolWriter();
+
+    TtyProtocolWriter(const TtyProtocolWriter&) = delete;
+    TtyProtocolWriter& operator=(const TtyProtocolWriter&) = delete;
+    TtyProtocolWriter(TtyProtocolWriter&& other) noexcept;
+    TtyProtocolWriter& operator=(TtyProtocolWriter&& other) noexcept;
+
+    void emit_packet_start() const;
+    void emit_step(uint16_t index, int16_t ch1_avg, int16_t ch2_avg) const;
+
+    const std::string& path() const;
+
+private:
+    void write_frame(uint16_t word0, uint16_t word1, uint16_t word2, uint16_t word3) const;
+    void close_fd() noexcept;
+
+    std::string path_;
+#ifndef _WIN32
+    int fd_ = -1;
+#endif
+};