code tested

F1:F103/shutter/shutter.h

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+/*
+ * This file is part of the shutter project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stm32f1.h>
+
+// opening/closing time (ms)
+#define SHUTTER_TIME    (20)
+// waiting for getting status time (ms)
+#define WAITING_TIME    (60)
+
+typedef enum{
+    SHUTTER_ERROR,          // shutter is absent?
+    SHUTTER_RELAX,          // powered off
+    SHUTTER_PROCESS,        // opened or closed
+    SHUTTER_WAIT,           // wait in off state before turn to hi-z
+    SHUTTER_EXPOSE,         //
+    SHUTTER_STATE_AMOUNT
+} shutter_state;
+
+extern shutter_state shutterstate;
+
+void process_shutter();
+int open_shutter();
+int close_shutter();
+int expose_shutter(uint32_t exptime);
+void print_shutter_state();