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2020-05-11 08:49:43 -06:00
commit 6f4ea0561f
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common/src/lx_nor_flash_close.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_close PORTABLE C */
/* 6.0 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function closes a NOR flash instance. */
/* */
/* INPUT */
/* */
/* nor_flash NOR flash instance */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* tx_mutex_delete Delete thread-safe mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* */
/**************************************************************************/
UINT _lx_nor_flash_close(LX_NOR_FLASH *nor_flash)
{
TX_INTERRUPT_SAVE_AREA
/* Lockout interrupts for NOR flash close. */
TX_DISABLE
/* See if the media is the only one on the media opened list. */
if ((_lx_nor_flash_opened_ptr == nor_flash) &&
(_lx_nor_flash_opened_ptr == nor_flash -> lx_nor_flash_open_next) &&
(_lx_nor_flash_opened_ptr == nor_flash -> lx_nor_flash_open_previous))
{
/* Only opened NOR flash, just set the opened list to NULL. */
_lx_nor_flash_opened_ptr = LX_NULL;
}
else
{
/* Otherwise, not the only opened NOR flash, link-up the neighbors. */
(nor_flash -> lx_nor_flash_open_next) -> lx_nor_flash_open_previous =
nor_flash -> lx_nor_flash_open_previous;
(nor_flash -> lx_nor_flash_open_previous) -> lx_nor_flash_open_next =
nor_flash -> lx_nor_flash_open_next;
/* See if we have to update the opened list head pointer. */
if (_lx_nor_flash_opened_ptr == nor_flash)
{
/* Yes, move the head pointer to the next opened NOR flash. */
_lx_nor_flash_opened_ptr = nor_flash -> lx_nor_flash_open_next;
}
}
/* Decrement the opened NOR flash counter. */
_lx_nor_flash_opened_count--;
/* Finally, indicate that this NOR flash is closed. */
nor_flash -> lx_nor_flash_state = LX_NOR_FLASH_CLOSED;
/* Restore interrupt posture. */
TX_RESTORE
#ifdef LX_THREAD_SAFE_ENABLE
/* Delete the thread safe mutex. */
tx_mutex_delete(&nor_flash -> lx_nor_flash_mutex);
#endif
/* Return success. */
return(LX_SUCCESS);
}