add buttons, not tested yet

F1:F103/CAR_CANbus/WindShield/buttons.h

@@ -0,0 +1,50 @@
+/*
+ * This file is part of the windshield project.
+ * Copyright 2024 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>
+
+// long press detector (>99ms)
+#define KEY_HOLDTIME    (99)
+
+// keycode for press/release
+typedef enum{
+    HALL_D,     // hall sensor DOWN
+    HALL_U,     // -//- UP
+    KEY_D,      // user key DOWN
+    KEY_U,      // -//- UP
+    DIR_D,      // ext signal (direct motor cables) DOWN
+    DIR_U,      // -//- UP
+    KEY_AMOUNT  // amount of keys connected
+} keycode;
+
+// events
+typedef enum{
+    EVT_NONE,   // no events with given key
+    EVT_PRESS,  // pressed
+    EVT_HOLD,   // hold more than KEY_HOLDTIME ms
+    EVT_RELEASE // released
+} keyevent;
+
+//extern uint32_t lastUnsleep; // last keys activity time
+
+int process_keys();
+void clear_events();
+uint8_t keystate(keycode k, keyevent *evt);
+keyevent keyevt(keycode k);