add flash storage

G4:G431/Servo/flash.h

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the flash 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 <stdint.h>
+#include "hardware.h"
+
+// register with flash size (in blocks)
+#ifndef FLASH_SIZE_REG
+#define FLASH_SIZE_REG      ((uint32_t)0x1FFF75E0)
+#endif
+#ifndef FLASH_SIZE
+#define FLASH_SIZE          *((uint16_t*)FLASH_SIZE_REG)
+#endif
+
+/*
+ * struct to save user configurations
+ */
+typedef struct __attribute__((packed, aligned(8))){
+    uint16_t userconf_sz;               // "magick number"
+    uint32_t usart_speed;               // speed of interface
+    uint16_t startpulse[SERVO_AMOUNT];  // starting position
+    uint16_t minpulse[SERVO_AMOUNT];    // minimal position
+    uint16_t maxpulse[SERVO_AMOUNT];    // maximal position
+    uint16_t maxspeed[SERVO_AMOUNT];    // maximal speed
+} user_conf;
+
+extern user_conf the_conf; // global user config (read from FLASH to RAM)
+extern int currentconfidx;
+extern uint32_t maxCnum;
+
+void flashstorage_init();
+int store_userconf();
+void dump_userconf();
+int erase_storage();
+