walnux/include/nuttx/progmem.h

/****************************************************************************
 * include/nuttx/progmem.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_PROGMEM_H
#define __INCLUDE_NUTTX_PROGMEM_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <sys/types.h>

#include <stdbool.h>

#ifdef CONFIG_ARCH_HAVE_PROGMEM

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

/****************************************************************************
 * Public Functions Definitions
 ****************************************************************************/

/****************************************************************************
 * Name: up_progmem_neraseblocks
 *
 * Description:
 *   Return number of erase blocks
 *
 ****************************************************************************/

size_t up_progmem_neraseblocks(void);

/****************************************************************************
 * Name: up_progmem_isuniform
 *
 * Description:
 *  Is program memory uniform or erase page and read/write page size differs?
 *
 ****************************************************************************/

bool up_progmem_isuniform(void);

/****************************************************************************
 * Name: up_progmem_pagesize
 *
 * Description:
 *   Return read/write page size
 *
 ****************************************************************************/

size_t up_progmem_pagesize(size_t page);

/****************************************************************************
 * Name: up_progmem_erasesize
 *
 * Description:
 *  Return erase block size. Must be a multiple of the read/write page size.
 *
 ****************************************************************************/

size_t up_progmem_erasesize(size_t block);

/****************************************************************************
 * Name: up_progmem_getpage
 *
 * Description:
 *   Address to read/write page conversion
 *
 * Input Parameters:
 *  addr - Address with or without flash offset
 *         (absolute or aligned to page0)
 *
 * Returned Value:
 *   Page or negative value on error.
 *   The following errors are reported (errno is not set!):
 *
 *     -EFAULT: On invalid address
 *
 ****************************************************************************/

ssize_t up_progmem_getpage(size_t addr);

/****************************************************************************
 * Name: up_progmem_getaddress
 *
 * Description:
 *   Read/write page to address conversion
 *
 * Input Parameters:
 *   page - page index
 *
 * Returned Value:
 *   Base address of given page, SIZE_MAX if page index is not valid.
 *
 ****************************************************************************/

size_t up_progmem_getaddress(size_t page);

/****************************************************************************
 * Name: up_progmem_eraseblock
 *
 * Description:
 *   Erase selected erase block.
 *
 * Input Parameters:
 *   block - The erase block index to be erased.
 *
 * Returned Value:
 *   block size or negative value on error.
 *   The following errors are reported (errno is not set!):
 *
 *     -EFAULT: On invalid page
 *     -EIO:    On unsuccessful erase
 *     -EROFS:  On access to write protected area
 *     -EACCES: Insufficient permissions (read/write protected)
 *     -EPERM:  If operation is not permitted due to some other constraints
 *              (i.e. some internal block is not running etc.)
 *
 ****************************************************************************/

ssize_t up_progmem_eraseblock(size_t block);

/****************************************************************************
 * Name: up_progmem_ispageerased
 *
 * Description:
 *   Checks whether erase page is erased
 *
 * Input Parameters:
 *   page - The page index to be checked.
 *
 * Returned Value:
 *   Returns number of bytes NOT erased or negative value on error. If it
 *   returns zero then complete page is erased.
 *
 *   The following errors are reported:
 *     -EFAULT: On invalid page
 *
 ****************************************************************************/

ssize_t up_progmem_ispageerased(size_t page);

/****************************************************************************
 * Name: up_progmem_write
 *
 * Description:
 *   Program data at given address
 *
 *   Note: this function is not limited to single page and nor it requires
 *   the address be aligned inside the page boundaries.
 *
 * Input Parameters:
 *   addr  - Address with or without flash offset
 *           (absolute or aligned to page0)
 *   buf   - Pointer to buffer
 *   count - Number of bytes to write
 *
 * Returned Value:
 *   Bytes written or negative value on error.  The following errors are
 *   reported (errno is not set!)
 *
 *     EINVAL: If count is not aligned with the flash boundaries (i.e.
 *             some MCU's require per half-word or even word access)
 *     EFAULT: On invalid address
 *     EIO:    On unsuccessful write
 *     EROFS:  On access to write protected area
 *     EACCES: Insufficient permissions (read/write protected)
 *     EPERM:  If operation is not permitted due to some other constraints
 *             (i.e. some internal block is not running etc.)
 *
 ****************************************************************************/

ssize_t up_progmem_write(size_t addr, FAR const void *buf, size_t count);

/****************************************************************************
 * Name: up_progmem_read
 *
 * Description:
 *   Read data at given address
 *
 *   Note: this function is not limited to single page and nor it requires
 *   the address be aligned inside the page boundaries.
 *
 * Input Parameters:
 *   addr  - Address with or without flash offset
 *           (absolute or aligned to page0)
 *   buf   - Pointer to buffer
 *   count - Number of bytes to read
 *
 * Returned Value:
 *   Bytes read or negative value on error.  The following errors are
 *   reported (errno is not set!)
 *
 *     EINVAL: If count is not aligned with the flash boundaries (i.e.
 *             some MCU's require per half-word or even word access)
 *     EFAULT: On invalid address
 *     EIO:    On unsuccessful read
 *     EACCES: Insufficient permissions (read/write protected)
 *     EPERM:  If operation is not permitted due to some other constraints
 *             (i.e. some internal block is not running etc.)
 *
 ****************************************************************************/

#ifdef CONFIG_ARCH_HAVE_PROGMEM_READ
ssize_t up_progmem_read(size_t addr, FAR void *buf, size_t count);
#endif

#undef EXTERN
#if defined(__cplusplus)
}
#endif

#endif /* CONFIG_ARCH_HAVE_PROGMEM */
#endif /* __INCLUDE_NUTTX_PROGMEM_H */