[GitHub] [incubator-nuttx] anjiahao1 commented on a diff in pull request #6829: drivers/mtd:init commit of power-loss resilient cfg

[GitBox <gi...@apache.org>]

anjiahao1 commented on code in PR #6829:
URL: https://github.com/apache/incubator-nuttx/pull/6829#discussion_r943305478


##########
include/nuttx/mtd/nvs_priv.h:
##########
@@ -0,0 +1,103 @@
+/****************************************************************************
+ * include/nuttx/mtd/nvs_priv.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_MTD_NVS_PRIV_H_
+#define __INCLUDE_NUTTX_MTD_NVS_PRIV_H_
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdint.h>
+#include <assert.h>
+#include <nuttx/compiler.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* MASKS AND SHIFT FOR ADDRESSES
+ * an address in nvs is an uint32_t where:
+ *   high 2 bytes represent the sector number
+ *   low 2 bytes represent the offset in a sector
+ */
+#define ADDR_SECT_MASK           0xFFFF0000
+#define ADDR_SECT_SHIFT          16
+#define ADDR_OFFS_MASK           0x0000FFFF
+
+/* Status return values */
+
+#define NVS_STATUS_NOSPACE       1
+
+#define NVS_BLOCK_SIZE           32
+
+/**
+ * @brief Non-volatile Storage File system structure
+ *
+ * @param offset File system offset in flash
+ * @param ate_wra: Allocation table entry write address. Addresses are stored
+ * as uint32_t: high 2 bytes are sector, low 2 bytes are offset in sector,
+ * @param data_wra: Data write address.
+ * @param sector_size File system is divided into sectors each sector
+ * should be multiple of pagesize
+ * @param sector_count Amount of sectors in the file systems
+ * @param write_block_size Alignment size
+ * @param nvs_lock Mutex
+ * @param flash_device Flash Device
+ */
+
+struct nvs_fs
+{
+  struct   mtd_dev_s *mtd;   /* mtd device */
+  off_t    offset;           /* filesystem offset in flash */
+  uint32_t ate_wra;          /* next alloc table entry write address */
+  uint32_t data_wra;         /* next data write address */
+  uint16_t sector_size;      /* filesystem is divided into sectors,
+                              * sector size should be multiple of pagesize
+                              */
+  uint16_t page_size;        /* page size */
+  uint16_t sector_count;     /* amount of sectors in the filesystem */
+  bool     ready;            /* is the filesystem initialized ? */
+
+  uint32_t step_addr;        /* for traverse */
+  sem_t    nvs_lock;

Review Comment:
   mutex_t ?



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