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diff --git a/Marlin/src/HAL/LINUX/hardware/IOLoggerCSV.h b/Marlin/src/HAL/LINUX/hardware/IOLoggerCSV.h
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+++ b/Marlin/src/HAL/LINUX/hardware/IOLoggerCSV.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <mutex>
+#include <list>
+#include <fstream>
+#include "Gpio.h"
+
+class IOLoggerCSV: public IOLogger {
+public:
+  IOLoggerCSV(std::string filename);
+  virtual ~IOLoggerCSV();
+  void flush();
+  void log(GpioEvent ev);
+
+private:
+  std::ofstream file;
+  std::list<GpioEvent> events;
+  std::mutex vector_lock;
+};