SPI1/2 works

F1:F103/BISS_C_encoders/flash.h

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+/*
+ * This file is part of the encoders project.
+ * Copyright 2025 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 "usb_descr.h"
+
+#define FLASH_SIZE_REG      ((uint32_t)0x1FFFF7E0)
+#define FLASH_SIZE          *((uint16_t*)FLASH_SIZE_REG)
+
+// maximal size (in letters) of iInterface for settings
+#define MAX_IINTERFACE_SZ   (16)
+
+/*
+ * struct to save user configurations
+ */
+typedef struct __attribute__((packed, aligned(4))){
+    uint16_t userconf_sz;       // "magick number"
+    uint16_t iInterface[bTotNumEndpoints][MAX_IINTERFACE_SZ]; // hryunikod!
+    uint8_t iIlengths[bTotNumEndpoints];
+} user_conf;
+
+extern user_conf the_conf;
+extern int currentconfidx;
+
+void flashstorage_init();
+int store_userconf();
+int erase_storage(int npage);
+
+