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2020-05-11 08:49:43 -06:00
commit 6f4ea0561f
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common/src/lx_nor_flash_extended_cache_enable.c
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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 TX_DISABLE_ERROR_CHECKING
#define TX_DISABLE_ERROR_CHECKING
#endif
/* Include necessary system files. */
#include "lx_api.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _lx_nor_flash_extended_cache_enable PORTABLE C */
/* 6.0 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function enables or disables the extended cache. */
/* */
/* INPUT */
/* */
/* nor_flash NOR flash instance */
/* memory Address of RAM for cache */
/* size Size of the RAM for cache */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* */
/**************************************************************************/
UINT _lx_nor_flash_extended_cache_enable(LX_NOR_FLASH *nor_flash, VOID *memory, ULONG size)
{
#ifndef LX_NOR_DISABLE_EXTENDED_CACHE
UINT i;
ULONG cache_size;
ULONG *cache_memory;
/* Determine if memory was specified but with an invalid size (less than one NOR sector). */
if ((memory) && (size < LX_NOR_SECTOR_SIZE))
{
/* Error in memory size supplied. */
return(LX_ERROR);
}
#ifdef LX_THREAD_SAFE_ENABLE
/* Obtain the thread safe mutex. */
tx_mutex_get(&nor_flash -> lx_nor_flash_mutex, TX_WAIT_FOREVER);
#endif
/* Initialize the internal NOR cache. */
nor_flash -> lx_nor_flash_extended_cache_entries = 0;
/* Calculate cache size in words. */
cache_size = size/sizeof(ULONG);
/* Setup cache memory pointer. */
cache_memory = (ULONG *) memory;
/* Loop through the memory supplied and assign to cache entries. */
i = 0;
while (cache_size >= LX_NOR_SECTOR_SIZE)
{
/* Setup this cache entry. */
nor_flash -> lx_nor_flash_extended_cache[i].lx_nor_flash_extended_cache_entry_sector_address = LX_NULL;
nor_flash -> lx_nor_flash_extended_cache[i].lx_nor_flash_extended_cache_entry_sector_memory = cache_memory;
nor_flash -> lx_nor_flash_extended_cache[i].lx_nor_flash_extended_cache_entry_access_count = 0;
/* Move the cache memory forward. */
cache_memory = cache_memory + LX_NOR_SECTOR_SIZE;
/* Decrement the size. */
cache_size = cache_size - LX_NOR_SECTOR_SIZE;
/* Move to next cache entry. */
i++;
}
/* Save the number of cache entries. */
nor_flash -> lx_nor_flash_extended_cache_entries = i;
#ifdef LX_THREAD_SAFE_ENABLE
/* Release the thread safe mutex. */
tx_mutex_put(&nor_flash -> lx_nor_flash_mutex);
#endif
/* Return successful completion. */
return(LX_SUCCESS);
#else
/* Return disabled error message. */
return(LX_DISABLED);
#endif
}