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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** LevelX Component */
/** */
/** NOR Flash */
/** */
/**************************************************************************/
/**************************************************************************/
#define LX_SOURCE_CODE
/* Disable ThreadX error checking. */
#ifndef LX_DISABLE_ERROR_CHECKING
#define LX_DISABLE_ERROR_CHECKING
#endif
/* Include necessary system files. */
#include "lx_api.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _lx_nor_flash_sector_read PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function reads a logical sector from NOR flash. */
/* */
/* INPUT */
/* */
/* nor_flash NOR flash instance */
/* logical_sector Logical sector number */
/* buffer Pointer to buffer to read into*/
/* (the size is 512 bytes) */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _lx_nor_flash_driver_write Driver flash sector write */
/* _lx_nor_flash_driver_read Driver flash sector read */
/* _lx_nor_flash_logical_sector_find Find logical sector */
/* _lx_nor_flash_physical_sector_allocate */
/* Allocate new logical sector */
/* _lx_nor_flash_system_error Internal system error handler */
/* tx_mutex_get Get thread protection */
/* tx_mutex_put Release thread protection */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* 06-02-2021 Bhupendra Naphade Modified comment(s), */
/* resulting in version 6.1.7 */
/* */
/**************************************************************************/
UINT _lx_nor_flash_sector_read(LX_NOR_FLASH *nor_flash, ULONG logical_sector, VOID *buffer)
{
UINT status;
ULONG *mapping_address;
ULONG mapping_entry;
ULONG *sector_address;
#ifdef LX_THREAD_SAFE_ENABLE
/* Obtain the thread safe mutex. */
tx_mutex_get(&nor_flash -> lx_nor_flash_mutex, TX_WAIT_FOREVER);
#endif
/* Increment the number of read requests. */
nor_flash -> lx_nor_flash_read_requests++;
/* See if we can find the sector in the current mapping. */
_lx_nor_flash_logical_sector_find(nor_flash, logical_sector, LX_FALSE, &mapping_address, §or_address);
/* Determine if the logical sector was found. */
if (mapping_address)
{
/* Yes, we were able to find the logical sector. */
/* Read the sector data from the physical sector. */
status = _lx_nor_flash_driver_read(nor_flash, sector_address, buffer, LX_NOR_SECTOR_SIZE);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
/* Adjust return status. */
status = LX_ERROR;
}
else
{
/* Set the status to success. */
status = LX_SUCCESS;
}
}
else
{
/* Allocate a new physical sector for this write. */
_lx_nor_flash_physical_sector_allocate(nor_flash, logical_sector, &mapping_address, §or_address);
/* Determine if the new sector allocation was successful. */
if (mapping_address)
{
/* Update the number of free physical sectors. */
nor_flash -> lx_nor_flash_free_physical_sectors--;
/* Read the sector data from the physical sector. */
status = _lx_nor_flash_driver_read(nor_flash, sector_address, buffer, LX_NOR_SECTOR_SIZE);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
}
/* Now build the new mapping entry. */
mapping_entry = ((ULONG) LX_NOR_PHYSICAL_SECTOR_VALID) | ((ULONG) LX_NOR_PHYSICAL_SECTOR_SUPERCEDED) | logical_sector;
/* Write out the new mapping entry. */
status = _lx_nor_flash_driver_write(nor_flash, mapping_address, &mapping_entry, 1);
/* Check for an error from flash driver. Drivers should never return an error.. */
if (status)
{
/* Call system error handler. */
_lx_nor_flash_system_error(nor_flash, status);
#ifdef LX_THREAD_SAFE_ENABLE
/* Release the thread safe mutex. */
tx_mutex_put(&nor_flash -> lx_nor_flash_mutex);
#endif
/* Return status. */
return(LX_ERROR);
}
/* Increment the number of mapped physical sectors. */
nor_flash -> lx_nor_flash_mapped_physical_sectors++;
/* Set the status to success. */
status = LX_SUCCESS;
}
else
{
/* Could not find the logical sector. */
status = LX_SECTOR_NOT_FOUND;
}
}
#ifdef LX_THREAD_SAFE_ENABLE
/* Release the thread safe mutex. */
tx_mutex_put(&nor_flash -> lx_nor_flash_mutex);
#endif
/* Return status. */
return(status);
}