restructure firmware to be more inline with pro

software/sys_controller/inc/fat16_export.h

@@ -0,0 +1,83 @@
+//
+// Copyright (C) 2020 Ari Sundholm <megari@iki.fi>
+//
+// This file has been contributed to the Open Source Scan Converter project
+// developed by Markus Hiienkari Markus Hiienkari <mhiienka@niksula.hut.fi>
+// and other members of the retro gaming community.
+//
+// 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/>.
+//
+
+#ifndef FAT16_EXPORT_H_
+#define FAT16_EXPORT_H_
+
+#include "alt_types.h"
+
+/* Use a sector size of 512 bytes. */
+#define FAT16_SECTOR_SIZE 512U
+
+/* This volume has 2048-byte clusters. */
+#define FAT16_CLUSTER_SIZE 2048U
+#define FAT16_SECTORS_PER_CLUSTER (FAT16_CLUSTER_SIZE/FAT16_SECTOR_SIZE)
+
+/* Offsets of the two File Allocation Tables. */
+#define FAT16_1_OFS 0x10000UL
+#define FAT16_2_OFS 0x14000UL
+
+/* Each FAT16 entry is a 16-bit little-endian integer. */
+#define FAT16_ENTRY_SIZE 2U
+#define FAT16_ENTRY_SHIFT 1U
+#define FAT16_ENTRIES_PER_SECTOR (FAT16_SECTOR_SIZE >> FAT16_ENTRY_SHIFT)
+
+/* On this volume, each FAT will be 16 kiB in size. */
+#define FAT16_SIZE 0x04000UL
+
+/* The first sector of the root directory. */
+#define FAT16_ROOT_DIR_FIRST_SECTOR 192U
+
+/* The length of the root directory in sectors. */
+#define FAT16_ROOT_DIR_SECTORS 128U
+
+/*
+ * Define the properties and contents of the directory entry for the
+ * settings file.
+ */
+#define PROF_DIRENT_16_OFS  0x18000UL
+#define PROF_DIRENT_16_SIZE 32U
+
+extern const alt_u8 prof_dirent_16[PROF_DIRENT_16_SIZE];
+
+#define PROF_16_DATA_OFS  0x028000UL
+#define PROF_16_DATA_SIZE 0x100200UL
+#define PROF_16_CLUSTER_COUNT ((PROF_16_DATA_SIZE/FAT16_CLUSTER_SIZE)+!!(PROF_16_DATA_SIZE%FAT16_CLUSTER_SIZE))
+/* Profile file data starts at offset 0x00028000 */
+/* Profile file data  ends  at offset 0x00128200 */
+/* Profile file data is 1049088 bytes long. */
+
+
+/* Generate a FAT16 boot sector.
+ * buf must be at least FAT16_BOOT_SECTOR_SIZE bytes long,
+ * and is assumed to be pre-zeroed.
+ */
+void generate_boot_sector_16(alt_u8 *buf);
+
+/*
+ * Generate a FAT of a FAT16 volume.
+ * The buffer is assumed to be zeroed out and have a size of at least 512 bytes.
+ * The number of clusters already written are given as an argument.
+ * The function returns the total number of clusters written so far.
+ */
+alt_u16 generate_fat16(void *buf, alt_u16 written);
+
+#endif // FAT16_EXPORT_H_