Initial commit. Unusable Marlin 2.0.5.3 core without any custimization.

Marlin/src/HAL/STM32F1/msc_sd.h

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+/**
+ * Marlin 3D Printer Firmware
+ *
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2019 BigTreeTech [https://github.com/bigtreetech]
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <USBComposite.h>
+
+extern USBMassStorage MarlinMSC;
+extern USBCompositeSerial MarlinCompositeSerial;
+
+void MSC_SD_init();